Integrated downhole operation tool based on bidirectional slip recoverable hydraulic packer
阅读说明：本技术 基于双向卡瓦可回收式液压封隔器的一体化井下作业工具 (Integrated downhole operation tool based on bidirectional slip recoverable hydraulic packer ) 是由 黄船 贾海 曾小军 潘登 贺秋云 张明友 谢胜 蔡佳成 陈华良 魏国安 陆峰 于 2019-11-28 设计创作，主要内容包括：本发明提供了一种基于双向卡瓦可回收式液压封隔器的一体化井下作业工具。所述作业工具包括：测试阀、压力计托筒、替液阀、封堵阀以及双向卡瓦可回收式液压封隔器。其中,所述封隔器包括：中芯轴,第一剪切固定件,第二剪切固定件,第三剪切固定件,自上而下依次套设在中芯轴外壁上的液缸外筒、锁紧芯轴和限位组件,依次套设在锁紧芯轴外壁上的环形活塞、锁环组件、胶筒、锥体和卡瓦。所述测试阀上端与一体化井下作业工具上游连接,测试阀下端与压力计上端连接,压力计下端与替液阀上端连接,替液阀下端与封堵阀上端连接,封堵阀下端与双向卡瓦可回收式液压封隔器连接。本发明同时具备试油测试和完井投产功能,能够回收使用。(The invention provides an integrated downhole operation tool based on a bidirectional slip recoverable hydraulic packer. The work tool includes: the hydraulic packer comprises a test valve, a pressure gauge supporting cylinder, a liquid replacing valve, a plugging valve and a bidirectional slip recoverable hydraulic packer. Wherein, the packer includes: the middle core shaft, the first shearing fixing piece, the second shearing fixing piece and the third shearing fixing piece are sequentially sleeved on the hydraulic cylinder outer cylinder, the locking core shaft and the limiting assembly on the outer wall of the middle core shaft from top to bottom, and the annular piston, the locking ring assembly, the rubber cylinder, the cone and the slips are sequentially sleeved on the outer wall of the locking core shaft. The testing valve upper end is connected with integration borehole operation instrument upper reaches, and the testing valve lower extreme is connected with the pressure gauge upper end, and the pressure gauge lower extreme is connected with replacing liquid valve upper end, replaces liquid valve lower extreme and is connected with the shutoff valve upper end, and the shutoff valve lower extreme is connected with two-way slips recoverable hydraulic packer. The invention has the functions of oil testing and well completion commissioning at the same time, and can be recycled.)
1. An integrated downhole tool based on a bidirectional slip retrievable hydraulic packer, the integrated downhole tool comprising a bidirectional slip retrievable hydraulic packer, wherein the packer comprises:
the middle core shaft, the first shearing fixing piece, the second shearing fixing piece and the third shearing fixing piece are sequentially sleeved on the outer wall of the middle core shaft from top to bottom, the hydraulic cylinder outer cylinder, the locking core shaft and the limiting assembly are sequentially sleeved on the outer wall of the middle core shaft from top to bottom, and the annular piston, the locking ring assembly, the rubber cylinder, the cone and the slip are sequentially sleeved on the outer wall of the locking core shaft from top to bottom,
the wall of the upper section of the central spindle is provided with an inner pressure transmission hole which can communicate the cavity of the central spindle with the outside, and the wall of the middle section of the central spindle is inwards concave relative to the walls of the upper section and the lower section;
a first cavity with a one-way opening is formed between the lower section of the outer cylinder of the hydraulic cylinder and the locking mandrel, the opening direction faces downwards, a pressure transfer channel is arranged in the upper section of the outer cylinder of the hydraulic cylinder, one opening of the pressure transfer channel is communicated with the inner pressure transfer hole, and the other opening of the pressure transfer channel is communicated with the first cavity;
a closed second cavity is defined by the middle sections of the locking mandrel and the middle mandrel, a through first bypass hole is further formed in the wall of the locking mandrel, and the second cavity can be communicated with the interior of the sleeve through the first bypass hole;
the locking core shaft and the middle core shaft are connected through a first shearing fixing piece;
the limiting component comprises a limiting outer cylinder and a limiting key, wherein a third cavity with a one-way opening is formed between the limiting outer cylinder and the locking mandrel, the opening direction is upward, and the limiting key is positioned in the third cavity and can limit the limiting outer cylinder to move downwards relative to the locking mandrel;
the annular piston is arranged in the first cavity and can seal the first cavity;
the locking ring assembly comprises a locking ring sleeve, an elastic piece and an inner locking ring, wherein the upper section of the locking ring sleeve can enter the first cavity and forms a fourth cavity with a one-way opening with the locking mandrel, the opening direction is upward, the upper section of the locking ring sleeve is connected with the outer cylinder of the hydraulic cylinder through a second shearing fixing piece, the elastic piece and the inner locking ring are both positioned in the fourth cavity, the upper end of the elastic piece is connected with the lower end face of the annular piston, the lower end of the elastic piece is connected with the upper end face of the inner locking ring, and the inner locking ring is pressed against the inner wall of the locking ring sleeve;
the upper end surface of the rubber cylinder and the lower end surface of the lock ring sleeve can contact or face each other;
the upper end surface of the cone body is contacted with the lower end surface of the rubber cylinder, the upper section of the cone body is connected with the locking mandrel through a third shearing fixing piece, and the distance from the conical surface of the cone body to the axis of the locking mandrel is gradually reduced from top to bottom;
the upper end of the slip is sleeved on the conical surface of the cone body, the slip can move upwards relative to the cone body and is in an opening state, and the lower end face of the slip is in contact with the upper end face of the limiting outer barrel.
2. The integrated downhole operation tool based on the bidirectional slip recoverable hydraulic packer as claimed in claim 1, wherein a sealed fifth cavity is formed between the lower section of the lock ring sleeve and the locking mandrel, and a second bypass hole is further formed in the locking mandrel and can communicate the fifth cavity with the second cavity.
3. The integrated downhole tool based on the bidirectional slip retrievable hydraulic packer as claimed in claim 1, wherein the rubber cylinder comprises a first elastic member, a second elastic member, an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder which are sequentially connected from top to bottom and have the same inner and outer diameters, wherein,
the upper end surface of the upper rubber cylinder is a first annular plane, and the lower end surface of the upper rubber cylinder is an inwardly-recessed first annular curved surface;
the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards;
the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane;
the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can bear radial shearing force;
the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can bear radial shearing force.
4. The integrated downhole tool based on the bidirectional slip recoverable hydraulic packer of claim 1, wherein the rubber material of the rubber sleeve is prepared from the following raw materials in parts by mass:
36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of N, N' -m-phenylene bismaleimide.
5. The integrated downhole tool based on a bi-directional slip retrievable hydraulic packer as recited in claim 4, wherein the plasticizer comprises at least one of DOS plasticizer, DOP plasticizer, TP-95 plasticizer, and TOTM plasticizer.
6. The integrated downhole tool based on the bidirectional slip recoverable hydraulic packer of claim 4, wherein the aging inhibitor comprises at least one of an RD aging inhibitor, a 445 aging inhibitor, a ZMTI aging inhibitor, and an MB aging inhibitor.
7. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, further comprising a hydraulic anchor connected to an upper end of the bidirectional slip retrievable hydraulic packer.
8. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 7, wherein the hydraulic anchor comprises an upper sub, a hydraulic anchor body, a volume tube, and a slip assembly, wherein,
the lower end of the upper joint is connected with the upper end of the hydraulic anchor body, the volume pipe is positioned in the hydraulic anchor body, and the outer wall of the volume pipe is in contact with or close to the inner wall of the hydraulic anchor body;
a plurality of groups of openings are formed in the hydraulic anchor body in the circumferential direction and the axial direction, a group of slip assemblies are installed in each group of openings, and each slip assembly comprises a hydraulic anchor slip, a limiting pressing plate, a hydraulic anchor slip spring and a locking screw;
the locking screw fixes the position that the limiting pressing plate is fixed on the hydraulic anchor body and limits the hydraulic anchor slip to pop out the hydraulic anchor body, the hydraulic anchor slip and the hydraulic anchor slip spring are arranged in the opening in sequence from inside to outside, one end of the hydraulic anchor slip spring is in contact with the hydraulic anchor slip, and the other end of the hydraulic anchor slip spring is in contact with the limiting pressing plate, so that the hydraulic anchor slip can move in the opening along the radial direction of the hydraulic anchor.
9. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the integrated tool further comprises a setting ball seat comprising a shear outer barrel, a ball seat core, and a fourth shear fixture, wherein,
the ball seat core is of a hollow structure and comprises an upper opening and a lower opening, and the ball seat core is arranged in an inner cavity of the shearing outer barrel and is connected with the inner wall of the shearing outer barrel through a fourth shearing fixing piece.
10. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the setting ball seat further comprises a seal to effect a seal between the ball seat core and the inner wall of the shear outer barrel.
11. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the setting ball seat further comprises a setting ball that can be dropped from a wellhead onto the ball seat core to seal off a tubing drift.
12. The integrated downhole tool based on the bidirectional slip recoverable hydraulic packer of claim 1, further comprising a test valve, a pressure gauge support cylinder, a liquid replacement valve and a plugging valve which are sequentially connected from top to bottom and finally connected to the bidirectional slip recoverable hydraulic packer.
13. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the integrated downhole tool further comprises an expansion joint capable of expanding and contracting the integrated downhole tool in a casing in an up-down direction.
14. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the integrated downhole tool further comprises a screen connected to the setting ball seat.
15. The integrated downhole tool based on a bi-directional slip retrievable hydraulic packer of claim 1, wherein the integrated downhole tool further comprises a perforating gun connected to a screen, the perforating gun capable of perforating the reservoir for a formation modification.
16. The integrated downhole tool based on a bidirectional slip retrievable hydraulic packer of claim 1, wherein the integrated downhole tool further comprises: the device comprises a telescopic joint, a normally closed valve, an RDS circulating valve, a pressure gauge support cylinder, an RTTS safety joint, a disjointed plugging valve and a setting ball seat.
Technical Field
The invention relates to the technical field of oil well testing and well completion equipment, in particular to an integrated downhole operation tool based on a bidirectional slip recoverable hydraulic packer.
Background
At present, most of oil testing and well completion operations of exploratory wells or evaluation wells need to be completed in two steps. The first step is that a test pipe column with a series of tools such as a test packer, a test valve, an electronic pressure gauge and the like is put near a production layer, then open flow production solving test is carried out, and well killing, pipe column lifting and temporary plugging are carried out after the test is finished, wherein the step mainly aims at obtaining formation information; if the production is available, the well completion is required to be put into operation, the second step is carried out, the shaft preparation (including drilling plug, wall scraping, well dredging and the like) is carried out again, and then a well completion pipe string with a well completion packer, a downhole safety valve and other series tools is put into operation. The two-step walking mode has certain limitations, and mainly shows that:
the process is multiple, the operation time is long, and the production cannot be put into operation in time. The oil testing test generally comprises more than ten steps of drifting, scraping walls, lowering a test pipe column, perforating, reservoir transformation, blowout and liquid drainage, production test, well killing, starting up the test pipe column and the like, the well completion operation comprises nearly ten steps of secondary shaft preparation, well completion pipe column lowering, liquid replacement, setting, blowout and the like, part of wells even need to be secondarily acidized to restore productivity, and a large amount of time can be consumed.
Repeated killing can cause pollution to the oil and gas producing formation, serious even permanent damage can be caused, and the oil and gas producing formation can not recover due productivity. Meanwhile, multiple killing easily causes the problems of pipe column blocking and burying and the like, increases the engineering difficulty, and even causes shaft scrapping if careless treatment is carried out, thus causing great waste of resources. The oil testing test pipe column is provided with testing tools such as a packer, a testing valve and the like, the space in a channel is limited, and plugging materials and the like are easy to accumulate at the tool to clamp and bury the pipe column in the well killing process, so that the test pipe column is difficult to pull out.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide an integrated downhole tool based on a bi-directional slip retrievable hydraulic packer that saves process steps, shortens operating time, and achieves rapid production.
In order to achieve the above object, the present invention provides an integrated downhole tool based on a bidirectional slip-recoverable hydraulic packer, comprising a bidirectional slip-recoverable hydraulic packer, wherein the packer comprises:
the middle core shaft, the first shearing fixing piece, the second shearing fixing piece and the third shearing fixing piece are sequentially sleeved on the outer wall of the middle core shaft from top to bottom, the hydraulic cylinder outer cylinder, the locking core shaft and the limiting assembly are sequentially sleeved on the outer wall of the middle core shaft from top to bottom, and the annular piston, the locking ring assembly, the rubber cylinder, the cone and the slip are sequentially sleeved on the outer wall of the locking core shaft from top to bottom,
the wall of the upper section of the central spindle is provided with an inner pressure transmission hole which can communicate the cavity of the central spindle with the outside, and the wall of the middle section of the central spindle is inwards concave relative to the walls of the upper section and the lower section;
a first cavity with a one-way opening is formed between the lower section of the outer cylinder of the hydraulic cylinder and the locking mandrel, the opening direction faces downwards, a pressure transfer channel is arranged in the upper section of the outer cylinder of the hydraulic cylinder, one opening of the pressure transfer channel is communicated with the inner pressure transfer hole, and the other opening of the pressure transfer channel is communicated with the first cavity;
a closed second cavity is defined by the middle sections of the locking mandrel and the middle mandrel, a through first bypass hole is further formed in the wall of the locking mandrel, and the second cavity can be communicated with the interior of the sleeve through the first bypass hole;
the locking core shaft and the middle core shaft are connected through a first shearing fixing piece;
the limiting component comprises a limiting outer cylinder and a limiting key, wherein a third cavity with a one-way opening is formed between the limiting outer cylinder and the locking mandrel, the opening direction is upward, and the limiting key is positioned in the third cavity and can limit the limiting outer cylinder to move downwards relative to the locking mandrel;
the annular piston is arranged in the first cavity and can seal the first cavity;
the locking ring assembly comprises a locking ring sleeve, an elastic piece and an inner locking ring, wherein the upper section of the locking ring sleeve can enter the first cavity and forms a fourth cavity with a one-way opening with the locking mandrel, the opening direction is upward, the upper section of the locking ring sleeve is connected with the outer cylinder of the hydraulic cylinder through a second shearing fixing piece, the elastic piece and the inner locking ring are both positioned in the fourth cavity, the upper end of the elastic piece is connected with the lower end face of the annular piston, the lower end of the elastic piece is connected with the upper end face of the inner locking ring, and the inner locking ring is pressed against the inner wall of the locking ring sleeve;
the upper end surface of the rubber cylinder and the lower end surface of the lock ring sleeve can contact or face each other;
the upper end surface of the cone body is contacted with the lower end surface of the rubber cylinder, the upper section of the cone body is connected with the locking mandrel through a third shearing fixing piece, and the distance from the conical surface of the cone body to the axis of the locking mandrel is gradually reduced from top to bottom;
the upper end of the slip is sleeved on the conical surface of the cone body, the slip can move upwards relative to the cone body and is in an opening state, and the lower end face of the slip is in contact with the upper end face of the limiting outer barrel.
In an exemplary embodiment of the invention, a sealed fifth cavity is formed between the lower section of the lock ring sleeve and the locking mandrel, and a second bypass hole is further formed in the locking mandrel and can communicate the fifth cavity with the second cavity.
In an exemplary embodiment of the present invention, the glue cylinder includes a first elastic member, a second elastic member, and an upper glue cylinder, a middle glue cylinder, and a lower glue cylinder which are sequentially connected from top to bottom and have the same inner and outer diameters, wherein,
the upper end surface of the upper rubber cylinder is a first annular plane, and the lower end surface of the upper rubber cylinder is an inwardly-recessed first annular curved surface;
the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards;
the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane;
the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can bear radial shearing force;
the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can bear radial shearing force.
In an exemplary embodiment of the present invention, the rubber material of the rubber cylinder may be prepared from the following raw materials in parts by mass:
36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of N, N' -m-phenylene bismaleimide.
In one exemplary embodiment of the present invention, the plasticizer may include at least one of a DOS plasticizer, a DOP plasticizer, a TP-95 plasticizer, and a TOTM plasticizer.
In an exemplary embodiment of the invention, the antioxidant may comprise at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant, and MB antioxidant.
In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a hydraulic anchor connected to an upper end of the bidirectional slip retrievable hydraulic packer.
In an exemplary embodiment of the invention, the hydraulic anchor comprises a top sub, a hydraulic anchor body, a containment tube, and a slip assembly, wherein,
the lower end of the upper joint is connected with the upper end of the hydraulic anchor body, the volume pipe is positioned in the hydraulic anchor body, and the outer wall of the volume pipe is in contact with or close to the inner wall of the hydraulic anchor body;
a plurality of groups of openings are formed in the hydraulic anchor body in the circumferential direction and the axial direction, a group of slip assemblies are installed in each group of openings, and each slip assembly comprises a hydraulic anchor slip, a limiting pressing plate, a hydraulic anchor slip spring and a locking screw;
the locking screw fixes the position that the limiting pressing plate is fixed on the hydraulic anchor body and limits the hydraulic anchor slip to pop out the hydraulic anchor body, the hydraulic anchor slip and the hydraulic anchor slip spring are arranged in the opening in sequence from inside to outside, one end of the hydraulic anchor slip spring is in contact with the hydraulic anchor slip, and the other end of the hydraulic anchor slip spring is in contact with the limiting pressing plate, so that the hydraulic anchor slip can move in the opening along the radial direction of the hydraulic anchor.
In an exemplary embodiment of the invention, the integrated work tool may further comprise a setting tee comprising a shear outer barrel, a tee base core, and a fourth shear fixture, wherein,
the ball seat core is of a hollow structure and comprises an upper opening and a lower opening, and the ball seat core is arranged in an inner cavity of the shearing outer barrel and is connected with the inner wall of the shearing outer barrel through a fourth shearing fixing piece.
In an exemplary embodiment of the invention, the setting ball seat may further comprise a seal to effect a seal between the ball seat core and the inner wall of the shear outer barrel.
In an exemplary embodiment of the invention, the setting ball seat may further comprise a setting ball which can be dropped from the wellhead onto the ball seat core to seal off the tubing drift.
In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a test valve, a pressure gauge support cylinder, a replacement fluid valve and a plugging valve connected in sequence from top to bottom and finally connected to the bidirectional slip retrievable hydraulic packer.
In an exemplary embodiment of the present invention, the integrated downhole tool may further comprise an expansion joint capable of expanding and contracting the integrated downhole tool in the casing in an up-down direction.
In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a screen connected to the setting seat.
In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a perforating gun coupled to the screen, the perforating gun capable of perforating the reservoir for a formation modification.
In an exemplary embodiment of the invention, the integrated downhole tool comprises: the device comprises a telescopic joint, a normally closed valve, an RDS circulating valve, a pressure gauge support cylinder, an RTTS safety joint, a disjointed plugging valve and a setting ball seat.
Compared with the prior art, the beneficial effects of the invention can include:
this integration is operation instrument in pit can save the operation process, and it is efficient that the formation is changeed in the formation to the oil testing, reduces the engineering complicacy, and protection hydrocarbon reservoir can realize two-way seal, reduces well accuse risk, but packer recycle.
Drawings
FIG. 1 illustrates a schematic structural view of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention;
FIG. 2 shows a schematic structural view of a hydraulic anchor and a bidirectional slip permanent hydraulic packer of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention;
FIG. 3 illustrates a schematic structural view of a setting ball seat of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention;
description of the main reference numerals:
100-expansion joint, 200-test valve, 300-pressure gauge support cylinder, 400-liquid replacement valve, 500-plugging valve, 600-hydraulic anchor, 700-bidirectional slip recoverable hydraulic packer, 800-setting ball seat, 601-upper joint, 602-hydraulic anchor body, 603-volume pipe, 604-hydraulic anchor slip, 605-limiting pressure plate, 606-hydraulic anchor slip spring, 607-locking screw, 701-central spindle, 702-outer cylinder, 703-locking spindle, 704-annular piston, 705-locking ring sleeve, 706-elastic element, 707-inner locking ring, 708-second shear pin, 709-rubber cylinder, 710-cone, 711-third shear pin, 712-slip, 713-retainer ring, 714-first shear pin, 715-limit key, 716-limit outer cylinder, 801-shear outer cylinder, 802-seat seal ball, 803-ball seat core and 804-fourth shear pin.
Detailed Description
Hereinafter, the integrated downhole operation tool based on the bidirectional slip recoverable hydraulic packer of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments. It should be noted that "first", "second", "third", "fourth", "fifth", etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," and "outer" are merely used for convenience of description and to constitute relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.
FIG. 1 shows a schematic configuration of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention. FIG. 2 shows a schematic of the structure of a hydraulic anchor and a bidirectional slip permanent hydraulic packer of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention. FIG. 3 illustrates a schematic structural view of a setting ball seat of an exemplary embodiment of an integrated downhole tool based on a bidirectional slip retrievable hydraulic packer according to the present invention.
In an exemplary embodiment of the invention, the integrated downhole tool based on a bidirectional slip retrievable hydraulic packer may comprise a bidirectional slip retrievable hydraulic packer.
In the present embodiment, as shown in fig. 2, the hydraulic anchor 600 includes: top sub 601, hydraulic anchor body 602, containment tube 603 and slip assembly.
Wherein, the lower end of the upper joint 601 is fixedly connected with the upper end of the hydraulic anchor body 602. Here, the lower end of the upper joint is provided with threads, the upper end of the hydraulic anchor body is provided with corresponding threads, the lower end of the upper joint and the upper end of the hydraulic anchor body are connected through threads, and a sealing element is further arranged between the upper joint and the hydraulic anchor body. The volume tube 603 is located inside the hydraulic anchor body 602, and the outer wall of the volume tube 603 is close to or in contact with the inner wall of the hydraulic anchor body 602. Here, the volume pipe is arranged in filtering the impurity in the oil gas, avoids impurity entering trompil on the hydraulic anchor body, influences the motion of water conservancy slips, and oil pipe internal pressure also can transmit through the volume pipe simultaneously. For example, the volume pipe may be a circular pipe with a certain number of small holes on the pipe wall, however, the present invention is not limited thereto, and the volume pipe may also have other structures as long as it can filter impurities in the oil gas.
The hydraulic anchor body 602 is provided with a plurality of groups of holes along the circumferential direction and the axial direction, and each group of holes is provided with a slip assembly consisting of a hydraulic anchor slip 604, a limiting pressing plate 605, a hydraulic anchor slip spring 606 and a locking screw 607 in a matching manner. Here, the number of the holes on the hydraulic anchor body can be determined according to actual conditions, for example, 2, 4, 6 or 8 holes can be arranged along the circumferential direction, and 2, 4, 6 or 8 holes can be arranged along the axial direction. The locking screw 607 will secure the hold-down plate 605 in a position on the hydraulic anchor body 602 that will define the ejection opening for the hydraulic anchor slips 604. Here, the limiting pressing plate is arranged in the direction of each opening axis in the up-down direction, a groove matched with the size of the limiting pressing plate is formed in the hydraulic anchor slip, when the hydraulic anchor slip is popped out of the hydraulic anchor body, the limiting pressing plate enters the groove in the hydraulic anchor slip, and the direction and the height of the hydraulic anchor slip are limited. The open hole is closed by the end of the hydraulic anchor slip 604 facing the inside of the hydraulic anchor body, one end of the hydraulic anchor slip spring 606 is positioned in the groove of the hydraulic anchor slip 604 and contacts with the bottom of the groove, and the other end of the hydraulic anchor slip spring 606 contacts with the limiting pressure plate 605, so that the hydraulic anchor slip 604 can move along the radial direction of the hydraulic anchor 600 under the pushing of pressure. Here, the hydraulic anchor slips are matched with the opening, and a sealing element is arranged between the hydraulic anchor slips and the inner wall of the opening for sealing.
In this embodiment, as shown in fig. 2, the bidirectional slip recoverable hydraulic packer 700 includes a central mandrel 701, a first shear fixing member, a second shear fixing member, a third shear fixing member, a hydraulic cylinder outer cylinder 702, a locking mandrel 703 and a limiting assembly, which are sequentially sleeved on the outer wall of the central mandrel from top to bottom, and an annular piston 704, a locking ring assembly, a rubber cylinder 709, a cone 710 and slips 712, which are sequentially sleeved on the locking mandrel 703 from top to bottom. Here, top-down refers to the axial direction from the upper end of the central mandrel 701 (or the end closer to the upstream of the integrated downhole tool) to the lower end of the central mandrel 701 (or the end closer to the downstream of the integrated downhole tool).
Wherein, well dabber 701 is the pipe structure, is provided with in a plurality of pressure transmission hole on the wall of well dabber 701 upper segment, and every pressure transmission hole can both communicate the inner space of well dabber 701 with the external world in pressure transmission hole in this a plurality of to transmit oil pipe internal pressure, the wall in well dabber 701 middle section is sunken inwards for the wall of its upper segment and hypomere. Here, the number of the internal pressure transfer holes may be determined according to actual conditions, for example, 1, 3, 5, or 8.
A first cavity with a one-way opening is formed between the lower section of the outer cylinder 702 and the locking mandrel 703, and the opening is downward. The upper section of the hydraulic cylinder outer cylinder 702 is also provided with a plurality of pressure transmission channels which have the same number with the inner pressure transmission holes and correspond to each inner pressure transmission hole, one end opening of each pressure transmission channel in the plurality of pressure transmission channels is communicated with the corresponding inner pressure transmission hole on the central spindle 701, and the other end opening is communicated with the first cavity so as to transmit the internal pressure of the oil pipe into the first cavity. Here, a sealing element is also arranged between the middle core shaft and the outer cylinder of the hydraulic cylinder.
The locking mandrel 703 is a circular tube structure, a closed second cavity is defined by the locking mandrel 703 and the middle section of the middle mandrel 701, a through first bypass hole is further formed in the tube wall of the locking mandrel 703, and the second cavity is communicated with the inner space of the sleeve by the first bypass hole. Here, the number of the first bypass holes may be determined according to actual situations, for example, 1, 3, 5, or 8. Here, a sealing element is also arranged between the locking mandrel and the outer cylinder of the hydraulic cylinder. The lock mandrel 703 is connected to the center mandrel 701 by a first shear mount. The limiting outer cylinder 716 has a plurality of first openings, the locking mandrel 703 has second openings with the same number as the first openings and corresponding to the first openings, and the middle mandrel 701 has first concave holes with the same number as the first openings and corresponding to the first openings. The first shear fastener may include a number of first shear pins 714, the number of first shear pins 714 being the same as the number of first apertures, each first shear pin 714 being insertable through a corresponding relationship of a first aperture into a second aperture and a first recess. Here, the number of the first openings may be determined according to practical circumstances, for example, 1, 3, 5, or 8. The first shear fixing may comprise several shear pins, however the invention is not limited thereto as long as a fixing is achieved which can be sheared off under the action of an external force.
The limiting component comprises a limiting outer cylinder 716 and a limiting key 715, wherein a third cavity with a one-way opening is formed between the limiting outer cylinder 716 and the locking mandrel 703, and the opening direction is upward. The lower end of the locking mandrel 703 is inserted into the third cavity, and the lower end of the locking mandrel 703 is provided with a key groove for limiting the key. The limiting key 715 is located in a key groove at the lower end of the locking mandrel 703 in the third cavity, and the limiting key 715 can limit the downward movement of the limiting outer cylinder 716 relative to the central mandrel. In addition, a groove can be further formed in the locking mandrel 703, the check ring 713 is located in the groove, and the stop outer cylinder 716 can be limited from moving upward relative to the locking mandrel 703 by the check ring 713.
An annular piston 704 is disposed in the first cavity, the annular piston 704 being capable of enclosing the first cavity. Here, the annular piston is sleeved on the outer wall of the locking mandrel and comprises a first section and a second section which are sequentially connected from top to bottom, wherein the radial dimension of the first section is larger than that of the second section, and a step is formed between the first section and the second section. The upper end surface and the outer wall surface of the first section of the annular piston are both contacted with the inner wall of the outer cylinder of the hydraulic cylinder. Here, sealing elements are also arranged between the first section of the annular piston and the locking mandrel and between the first section of the annular piston and the outer cylinder of the hydraulic cylinder.
The locking ring assembly includes a locking ring sleeve 705, a resilient member 706, and an inner locking ring 707, wherein an upper section of the locking ring sleeve 705 is accessible into the first cavity. Here the locking ring sleeve interacts with the annular piston in the first cavity, the lower end of the annular piston being inserted into the upper end of the locking ring sleeve and the upper end of the locking ring sleeve bearing against a step of the annular piston, so that the annular piston and the locking ring sleeve are pressed against and abut each other. Here, a sealing element is also arranged between the lock ring sleeve and the annular piston. A fourth cavity with a one-way opening is formed between the locking ring sleeve 705 and the locking mandrel 703, the opening is upward, and the upper section of the locking ring sleeve 705 is connected with the outer cylinder 702 of the hydraulic cylinder through a second shearing fixing piece. Here, a sealing element is also arranged between the lock ring sleeve and the lock core shaft. The outer cylinder 702 is provided with a plurality of third openings, and the lock ring sleeve 705 is provided with second concave holes which have the same number as the third openings and correspond to the third openings. The second shear fastener may include a plurality of second shear pins 708, the number of the second shear pins 708 is the same as the number of the third openings, and each of the second shear pins 708 may be inserted into the corresponding third openings and the second recesses to fixedly connect the upper ring sleeve 705 with the cylinder outer barrel 702. Here, the number of the third openings may be determined according to actual conditions, for example, 1, 3, 5, or 8. The second shear fixing member may comprise a plurality of shear pins, however, the present invention is not limited thereto, as long as the fixing member can fix the cylinder outer cylinder and the lock ring sleeve and can be sheared off under the external force.
The elastic piece 706 and the inner locking ring 707 are both located in the fourth cavity, the upper end of the elastic piece 706 is connected with the lower end face of the annular piston 704 to transmit long downward pushing force of the annular piston, the lower end of the elastic piece 706 is connected with the upper end face of the inner locking ring 707 to push the inner locking ring 707 to move downwards, and the inner locking ring 707 moves downwards to be pressed on the inner wall of the locking ring sleeve 705 to prevent the locking ring sleeve 705 from moving reversely. Here, the elastic member may be a spring, however, the present invention is not limited thereto, and the elastic member may have other structures as long as the functions of providing an elastic force and being compressible are achieved.
A sealed fifth cavity is formed between the lower section of the lock ring sleeve 705 and the locking mandrel 703, and the fifth cavity is communicated with the second cavity through a second bypass hole in the locking mandrel 703. Here, the fifth cavity is communicated with the second cavity through the second bypass hole, the second cavity is communicated with the inside of the oil pipe through the first bypass hole, and then the fifth cavity is communicated with the inside of the oil pipe. Here, the number of the second bypass holes may be determined according to actual circumstances, for example, 1, 3, 5, or 8, etc.
The rubber cylinder 709 is sleeved between the lower end of the locking ring sleeve 705 and the upper end of the vertebral body 710, the rubber cylinder 709 is sleeved on the outer wall of the locking mandrel 703, the upper end of the rubber cylinder is close to or opposite to the lower end of the locking ring sleeve 705, and the lower end of the rubber cylinder is in contact with or close to the upper end of the vertebral body 710. The rubber sleeve 709 can be deformed under the compression of the lower end of the locking ring sleeve 705 and the upper end of the vertebral body 710, so that the packer and the inner wall of the casing form a sealing connection.
The cone 710 has a tapered structure, and the distance from the tapered surface of the cone 710 to the axis of the locking mandrel decreases gradually from top to bottom. For example, the included angle between the conical surface of the cone and the axial direction can be 20-40 degrees. The cone 710 has a plurality of fourth openings, and the locking mandrel 703 has third concave holes with the same number as the fourth openings and corresponding to the fourth openings. The third shear fastener may comprise a plurality of third shear pins 711, the number of the third shear pins 711 is the same as the number of the fourth openings, and each third shear pin 711 can be inserted into the fourth opening and the third recess in a corresponding relationship to fixedly connect the vertebral body 710 with the locking mandrel 703. Here, the number of the fourth apertures may be determined according to actual conditions, for example, 1, 3, 5, or 8. The third shear fixing element may comprise several shear pins, but the invention is not limited thereto, as long as a fixing element is provided which enables the fixation of the vertebral body to the locking mandrel and which can be sheared off by an external force.
The slip 712 is a cylinder-like structure, and the slip 712 is composed of a plurality of slip pieces uniformly distributed along the circumferential direction, the lower ends of the slip pieces are fixedly connected, and an opening or a gap is arranged between the upper ends along the axial direction. The slip 712 includes a plurality of slip segments each having a tooth-like structure on an outer wall thereof, the tooth-like structure being angled downwardly and at an angle to the outer wall of the slip. The inner wall of the slip 712 cylinder-like structure is provided with a structure matching with the conical surface of the cone 710 near the upper end, and the slip 712 slides upwards relative to the conical surface of the cone 710 so as to be spread, so that the tooth-shaped structures on the outer wall surfaces of a plurality of slip sheets in the slip 712 are engaged with the inner wall of the casing to fix the position of the slip 712 in the casing. Here, the lower end of the slip 712 is pressed against the upper end of the limiting outer cylinder 716, the slip 712 and the limiting outer cylinder 716 are fixed by a long shaft bolt, and the two limiting outer cylinders 716 are fixed with the locking mandrel 703 by a limiting key 715, so that the upper end of the slip 712 can be expanded by a vertebral body during setting.
In this embodiment, as shown in fig. 3, the
The shearing
The
The inner cavity of the shearing
The setting
In this embodiment, the glue cylinder 709 may include a first elastic member, a second elastic member, an upper glue cylinder, a middle glue cylinder, and a lower glue cylinder that are sequentially connected from top to bottom and have the same inner and outer diameters, wherein an upper end surface of the upper glue cylinder is a first annular plane, and a lower end surface of the upper glue cylinder is an inwardly concave first annular curved surface; the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards; the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane; the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can better bear radial shearing force; the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can better bear radial shearing force.
The height ratio of the upper glue cylinder to the middle glue cylinder can be 1: 0.83-1: 1.3, the ratio of the rubber cylinder outer diameter to the rubber cylinder height can be 1: 1-1: 1.5, after the three rubber cylinders are compressed and set in the sleeve, the axial compression ratio is less than 0.25, and according to the principle that the volumes of the rubber cylinders are not changed before and after compression, the compression ratio of the rubber cylinders adhered to the wall of the sleeve after compression deformation can be changed by adjusting the length and thickness values of the rubber cylinders. For example, the thicker the rubber sleeve is, the more easily the rubber sleeve is attached to the sleeve, and when the rubber sleeve is compressed and attached to the wall of the sleeve, only a small axial compression rate is needed; when the rubber cylinder is thin, the rubber cylinder needs to be compressed by a large amplitude in the axial direction, and the compression ratio of the rubber cylinder is large. When the compression ratio is controlled within 0.25, the length and the thickness of the rubber cylinder are inversely designed according to the size of the inner diameter of the sleeve, so that the rubber cylinder can be tightly attached to the inner wall of the sleeve after being compressed better, and the rubber cylinder cannot be bent in the axial direction.
The contained angle of first annular curved surface and last packing element axis is 79 ~ 81 degrees, and the packing element is wrapped up the extrusion by the oblique angle in this angle range, and compression deformation is more balanced, and the packing element is difficult for off-centre, and circumferential seal is better.
The first elastic member may include a first spring, the second elastic member may include a second spring, both the first spring and the second spring may be multi-layer springs, the first spring may surround a ring in the upper glue cartridge, and a radial direction of the ring may be perpendicular to an axial direction of the upper glue cartridge, the second spring may surround a ring in the lower glue cartridge, and a radial direction of the ring may be perpendicular to an axial direction of the lower glue cartridge. Wherein the initial length of the spring can be calculated according to the following formula:
L＝πD+15
wherein, L: lap length, D: diameter of the rubber cylinder, pi: 3.1416, unit in formula: mm.
And (4) cutting the large spring after calculating the initial length, placing the large spring into a product vulcanization mold after splicing the large spring, and comparing the large spring and the large spring, and determining the proper length to be cut according to the actual condition. The inner spring is cut according to the actual length of the outer spring.
In this embodiment, the rubber material of the rubber cylinder is prepared from the following raw materials in parts by mass: 36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of pottery clay, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.
The rubber materials of the upper rubber cylinder and the lower rubber cylinder can be prepared from the following components in parts by mass: 36-46% of hydrogenated nitrile rubber, 23-33% of spray carbon black, 4-14% of thermal cracking carbon black, 3-13% of nano white carbon black, 3-13% of argil, 1-4% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.
The rubber material of the medium rubber cylinder can be prepared from the following raw materials in percentage by mass: 40-50% of hydrogenated nitrile rubber, 12-22% of spray carbon black, 1-11% of thermal cracking carbon black, 4-14% of nano white carbon black, 9-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.
The hydrogenated nitrile rubber can be selected from Arraniaceae HNBR3607, HNBR3907, HNBR4307 and HNBR4367, the hydrogenated nitrile rubber HNBR has excellent oil resistance and solvent resistance and keeps good high and low temperature resistance balance, the mass fraction of acrylonitrile in the hydrogenated nitrile rubber can be 36-44%, the content of residual double bonds is less than 8%, and the crude rubber Mooney viscosity ML1+4(100 ℃) of the hydrogenated nitrile rubber can be 50-100.
When the mass fraction of acrylonitrile in the selected hydrogenated nitrile rubber is 36-44%, the prepared rubber material can have heat resistance, oil resistance and hydrogen sulfide resistance and has good compression set characteristics. The rubber sleeve of the test packer is required to have good recovery after the test is finished, the higher the acrylonitrile content is, the poorer the recovery of the rubber sleeve is, and in order that the rubber sleeve of the test packer prepared from the rubber material has good recovery after the test is finished, the mass fraction of acrylonitrile is not suitable to be high.
When the content of residual double bonds in the selected hydrogenated nitrile rubber is less than 8%, more cross-linked bonds can be generated during vulcanization, the three-dimensional network structure of the rubber can be improved, and the rubber can resist higher pressure in an oil gas well.
When the Mooney viscosity of the raw rubber of the selected hydrogenated nitrile rubber is within the range of 50-100, the rubber material can be ensured to have good processability in the rubber mixing and vulcanizing process.
The spray carbon black, the thermal cracking carbon black and the nano white carbon black are used as combined reinforcing materials, and the combined reinforcing materials are used for improving the mechanical strength of rubber and simultaneously respectively playing unique advantages to resist severe environments such as underground high-temperature aging, dynamic load body failure, high extrusion tearing and the like. Wherein, the spraying of the carbon black can also improve the later-period aging resistance of the rubber; the thermal carbon black has the largest particle size (average diameter of 240-320 nm) but the lowest specific surface area of 7-12 m 2The thermal cracking carbon black can reduce the compression permanent deformation of rubber and improve the dynamic sealing performance; high specific surface area nano white carbon black (specific surface area is 250 m) 2And/g), the primary particle diameter is less than 100nm, and the tear resistance and the wear resistance of the rubber in a high-temperature and high-pressure environment can be greatly improved.
The use of clay as a filler can improve the hardness and acid resistance of the rubber without impairing the processability, and can avoid the problems of difficult processing and low yield of the rubber caused by excessive use of the carbon black reinforcing agent.
Here, in order to improve the processability of the rubber and the fluidity of the material in the mold during vulcanization, a plasticizer may be added to the raw materials for preparation, and the plasticizer may be at least one selected from DOS plasticizer, DOP plasticizer, TP-95 plasticizer and TOTM plasticizer, and further, may be two selected from them, wherein TOTM can improve the high temperature resistance of the rubber and DOS can improve the low temperature resistance of the rubber.
The antioxidant can be at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant and MB antioxidant, and can be two antioxidants, wherein the antioxidants RD and MB can slow down the aging speed of rubber and prolong the service life of the rubber, and the antioxidants 445 and ZMTI have good synergistic effect.
The di-tert-butylperoxyisopropyl benzene is used for replacing the traditional sulfur as a vulcanizing agent, and because the di-tert-butylperoxyisopropyl benzene is not peroxide, a C-C bond is formed during vulcanization crosslinking, the strength is higher than that of an S-S bond formed during sulfur vulcanization, the structural strength of a rubber molecular chain during vulcanization crosslinking into a net is increased, the temperature resistance and the hydrogen sulfide corrosion resistance are better, and the better structural strength of a rubber body is realized. The effective content of the di-tert-butylperoxycumene may be not less than 40%, for example, 60%.
The N, N' -m-phenylene bismaleimide serves as an auxiliary crosslinking agent and can cooperate with peroxide to accelerate the vulcanization of the hydrogenated nitrile rubber to form a higher crosslinking network structure and crosslinking density so as to prolong the sealing capacity and time. Because the packing time required when the pressure difference resistance reaches 105MPa is longer, namely at least 24h is packed at 177 ℃, a proper amount of crosslinking accelerator can generate the optimal mechanical property.
In another exemplary embodiment of the present invention, as shown in FIG. 1, an integrated downhole tool comprises: the hydraulic packer comprises an expansion joint 100, a test valve 200, a pressure gauge support cylinder 300, a liquid replacement valve 400, a plugging valve 500, a hydraulic anchor 600, a bidirectional slip recoverable hydraulic packer 700 and a
Wherein, the upper end of the expansion joint 100 is fixedly connected with the upper oil pipe of the integrated downhole operation tool, and the lower end of the expansion joint 100 is fixedly connected with the upper end of the test valve 200. The telescopic joint is arranged, so that the integrated operation tool can stretch up and down in the sleeve, the shrinkage of the integrated underground operation tool is compensated, and the drill floor operation is convenient when the underground operation tool in the later period is out of hand. Here, the connection of the expansion joint to the upper oil pipe and the expansion joint to the test valve may be a threaded connection, however, the invention is not limited thereto, for example, the test valve may be directly connected to the upper oil pipe without passing through the expansion joint or the expansion joint may be indirectly connected to the test valve through a section of oil pipe.
The lower end of the test valve 200 is fixedly connected with the upper end of the pressure gauge supporting cylinder 300, and an electronic pressure gauge is arranged in the pressure gauge supporting cylinder 300. Here, the test valve is used for testing the flow rate of oil and gas in an oil and gas reservoir during oil testing, and the electronic pressure gauge is used for testing the pressure of underground formations. The lower end of the pressure gauge support cylinder 300 is fixedly connected with the upper end of the liquid replacement valve 400, and the lower end of the liquid replacement valve 400 is fixedly connected with the upper end of the blocking valve 500. The liquid replacing valve is used for replacing and replacing well killing liquid for a well killing, the plugging valve is used for plugging the underground space, the well can be opened and closed by opening and closing the plugging valve, and the opening and closing of the plugging valve can be realized by pressurization in a pipe or annular pressurization.
The lower end of the plugging valve 500 is fixedly connected with the upper end of a hydraulic anchor 600, the lower end of the hydraulic anchor 600 is connected with the upper end of a bidirectional slip recoverable hydraulic packer 700, and the bidirectional slip recoverable hydraulic packer 700 can be fixedly connected with the inside of a sleeve and form sealing connection. The lower end of the two-way slip recoverable hydraulic packer 700 is fixedly connected with the upper end of the setting
During setting, a
When the pressure in the oil pipe is higher than the pressure in the casing during the reservoir transformation operation, the hydraulic anchor slips 604 are pushed out by pressure difference and embedded into the casing for fixation, the upward jacking force applied to the pipe column is overcome, and when the oil pressure is not higher than the casing pressure after the reservoir transformation operation is finished, the hydraulic anchor slips 604 automatically rebound.
After the oil testing operation is completed and the packer needs to be unset, the pipe column is directly lifted, the first shearing fixing piece is sheared, the middle core shaft 701 and the inner pressure transmission on the middle core shaft are moved upwards, the pressure in the oil pipe and the pressure in the casing pipe are quickly communicated, and the pressure difference between the upper part and the lower part of the rubber sleeve 709 is balanced. The pipe string is lifted continuously, the slips 712 are retracted, and the entire integrated downhole tool pipe string can be pulled out smoothly.
In yet another exemplary embodiment of the present invention, the integrated downhole tool may include a telescoping section, a normally closed valve, an RDS circulation valve, a pressure gauge support cylinder, an RTTS safety joint, a breakaway plugging valve, a two-way slip retrievable hydraulic packer, and a setting ball seat connected in series from top to bottom. Wherein the packer may be the same as the bi-directional slip retrievable hydraulic packer of the first exemplary embodiment.
The integrated downhole operation tool can permanently plug a producing zone and can be inserted back to communicate with the stratum again to realize well completion; the stratum is plugged by pulling the ball valve through the disjointed plugging valve when the plug is released, and tight plugging is realized without the help of pressure difference; the packer is a 70MPa bidirectional slip hydraulic recoverable packer, can meet the requirement of differential pressure of a perforation-acidizing tubular column during a test period, and can be used as a hanger of a plugging tool for a long time. The pipe column can be combined with a gun and can also be carried out under the condition of jetting a producing layer; the pipe column disjointed type blocking hair part is disjointed, and an RTTS safety joint can be simultaneously put in as a standby means for releasing; after the pipe column is plugged, circulation can be established through the RDS valve and the normally-closed valve, and under the condition that the operating pressure of the casing pipe is insufficient, circulation is realized through the normally-closed valve; the pipe column is suitable for 5 'and 7' casing pipes, can be sealed in a double-seal span mode, and the telescopic section can compensate contraction of the pipe column and can be used for facilitating operation of a drill floor when hands are removed at the later stage.
In conclusion, the integrated downhole operation tool based on the bidirectional slip recoverable hydraulic packer has the following advantages:
the integrated downhole operation tool has the functions of oil testing and well completion commissioning, the setting procedure of the bidirectional slip recoverable hydraulic packer is simple, bidirectional bearing and pulling can be realized, the functions of releasing and secondary tie-back are realized, and a pipe column above the packer can be recovered, maintained or replaced; after releasing the hands, the mechanical slips and the hydraulic anchor mechanism on the packer can guarantee that the packer is stably hung in the casing pipe, the weight of the lower-part pipe column can be borne, the whole test pipe column can be taken out through direct deblocking after the oil testing is finished, and the cost is saved.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种可回收套管气的采油井口装置及方法