阅读说明：本技术 一体式可捞可钻挤注工具及其施工工艺 (Integrated fishing and drilling squeezing tool and construction process thereof ) 是由 刘中平 于 2020-06-24 设计创作，主要内容包括：本发明属于石油开采井下作业工具技术领域,尤其涉及一种一体式可捞可钻挤注工具,包括上接头1、中心管17、坐封活塞6、坐封推套9、活塞套3、上锥体13、下锥体15、卡瓦14、卡瓦套12和胶筒19,还包括副活塞5、插管7和滑套22,所述上接头1通过一个转接头4连接在所述插管7的上端,所述活塞套3的上端套在上接头1上并通过一个螺纹压帽2锁紧固定,所述坐封活塞6和副活塞5均设置在活塞套3内侧的环形空间内,坐封活塞6和副活塞5之间通过剪钉A36连接,坐封活塞6滑动安装在坐封套3和插管7之间,坐封活塞6的上侧通过所述转接头4的下端面限位,副活塞5滑动安装在活塞套3和上接头1之间。本发明采用插管与桥塞一体式设计,节省了作业时间和作业费用。(The invention belongs to the technical field of oil exploitation downhole operation tools, and particularly relates to an integrated fishing and drilling squeezing tool which comprises an upper connector 1, a central pipe 17, a setting piston 6, a setting push sleeve 9, a piston sleeve 3, an upper cone 13, a lower cone 15, a slip 14, a slip sleeve 12, a rubber barrel 19, an auxiliary piston 5, an insertion pipe 7 and a sliding sleeve 22, the upper joint 1 is connected with the upper end of the insertion pipe 7 through a joint 4, the upper end of the piston sleeve 3 is sleeved on the upper joint 1 and is locked and fixed through a thread pressing cap 2, setting piston 6 and vice piston 5 all set up in the inboard annular space of piston bush 3, connect through shear pin A36 between setting piston 6 and the vice piston 5, and setting piston 6 slidable mounting is between setting cover 3 and intubate 7, and the upside of setting piston 6 passes through the lower terminal surface of adapter 4 is spacing, and vice piston 5 slidable mounting is between piston bush 3 and top connection 1. The invention adopts the integral design of the insertion pipe and the bridge plug, thereby saving the operation time and the operation cost.)

1. The utility model provides an integral type can drag for and bore crowded notes instrument, includes top connection (1), center tube (17), setting piston (6), setting push away cover (9), piston cover (3), goes up cone (13), lower cone (15), slips (14), slip cover (12) and packing element (19), its characterized in that: still include vice piston (5), intubate (7) and sliding sleeve (22), top connection (1) is connected through an adapter (4) the upper end of intubate (7), the upper end cover of piston cover (3) is on top connection (1) and is fixed through a screw thread pressure cap (2) locking, sit and seal piston (6) and vice piston (5) and all set up in the annular space of piston cover (3) inboard, sit and seal and connect through shear pin A (36) between piston (6) and vice piston (5), sit and seal piston (6) slidable mounting between sitting and sealing cover (3) and intubate (7), and the upside of sitting and sealing piston (6) passes through the lower terminal surface of adapter (4) is spacing, and vice piston (5) slidable mounting is between piston cover (3) and top connection (1), and the upper and lower both sides of vice piston (5) are spacing through the shaft shoulder on top connection (1) and adapter (4) respectively, a radial through hole is formed in the side face of the upper portion of the setting piston (5), a locking block A (34) capable of sliding in the radial direction is installed in the radial through hole, a clamping groove matched with the locking block A (34) is formed in the adapter (4), the inner side of the locking block A (34) abuts against the bottom of the clamping groove, the outer side of the locking block A (34) abuts against the inner side of the auxiliary piston (5), and the outer side of the lower end of the setting piston (6) is connected with a locking sleeve A (8) through threads;

the inserting pipe (7) is inserted into the central pipe (17) and connected through a shear pin C, the setting push sleeve (9) is slidably mounted on the outer side of the central pipe (17), the upper cone (13) and the lower cone (15) are slidably mounted on the outer side of the setting push sleeve (9), and the slip sleeve (12) is sleeved on the outer sides of the upper cone (13), the lower cone (15) and the slip (14);

a salvaging sleeve (37) is arranged in an annular space between the upper end of the central tube (17) and the upper end of the setting push sleeve (9), an inner hole snap spring (45) used for limiting the upper side of the salvaging sleeve (37) is arranged on the inner side of the upper end of the setting push sleeve (9), the salvaging sleeve (37) is connected to the central tube (17) through a shear pin B (32), salvaging threads are arranged on the outer side of the upper end of the salvaging sleeve (37), a snap spring hanger (11) is arranged below the salvaging sleeve (37), the lower side of the snap spring hanger (11) is limited through a shaft shoulder on the outer side of the central tube (17), meanwhile, the lower end face of the snap spring hanger (11) is abutted against a shoulder on the inner side of the setting push sleeve (9), an annular clamping groove (42) is arranged on the outer side of the snap spring hanger (11), a snap spring (31) is arranged in the annular clamping groove (42), and stopping threads (44) which, a lock sleeve B (10) is arranged on the outer side of the setting push sleeve (9), an elastic claw A (33) is arranged at the lower end of the lock sleeve A (8), a protruding part (41) is processed on the inner side of the tail end of the elastic claw A (33), an annular clamping groove (42) matched with the protruding part (41) is processed on the outer side of the upper end of the lock sleeve B (10), the protruding part (41) is clamped in the annular clamping groove (42), the outer side of the protruding part (41) is limited through the piston sleeve (3), and the lower end of the lock sleeve (10) is connected to the outer side of the upper end of the upper cone (13) through threads;

the rubber sleeve (19) is sleeved on the outer side of the central tube (17), the rubber sleeve (19) is positioned below the slip sleeve (12), a middle push sleeve (16) and a push ring (18) are arranged between the slip sleeve (12) and the rubber sleeve, the upper end of the middle push sleeve (16) is inserted into an annular space between the slip sleeve (12) and the lower cone (15), the inner side of the lower end of the slip sleeve (12) is connected with a back cap (29) through threads, the upper side and the lower side of the middle push sleeve (16) are limited by a shaft shoulder on the lower cone (15) and the upper end face of the back cap (29) inside the slip sleeve (12), the upper end of the push ring (18) is connected to the lower end of the middle push sleeve (16) through threads, and the lower end face of the push ring (18) abuts against the rubber sleeve (19);

the lower end of the central pipe (17) is connected with a plug (21) through threads, and the sliding sleeve (22) is arranged at the lower end of the central pipe (17) and the inner side of the plug (21);

the lower end of the cannula (7) is connected with a cannula head (20) through threads;

a liquid passing hole A (35) for communicating the inner side space and the outer side space of the adapter (4) is formed in the side wall of the adapter (4);

a liquid passing hole B (28) used for communicating the inner side space and the outer side space of the central tube (17) is formed in the side wall of the central tube (17), and the axial position of the liquid passing hole B is located on the inner side of the middle push sleeve (16);

a liquid passing hole C (27) for communicating the inner side space and the outer side space of the insertion pipe (7) is formed in the side wall of the lower end of the insertion pipe (7);

the cannula head (20) is provided with a liquid passing hole D (26) used for communicating the inner side space and the outer side space of the cannula head (20), and the axial direction of the liquid passing hole D (26) is the same as that of the cannula (7);

the side wall of the sliding sleeve (22) is provided with a liquid passing hole E (25) for communicating the inner side space and the outer side space of the sliding sleeve (22);

the plug (21) is provided with a liquid passing hole F (23) for communicating the inner space and the outer space of the plug (21), and the axial direction of the liquid passing hole F (23) is vertical to the axial direction of the insertion pipe (7);

a rubber sealing ring (24) for sealing a gap between the inner wall of the central tube (17) and the outer wall of the insertion tube (7) is arranged on the inner side of the central tube (17), and the axial position of the rubber sealing ring (24) is positioned between the liquid passing hole B (28) and the liquid passing hole C (27);

and another rubber sealing ring (24) is arranged between the lower end surface of the central tube (17) and the choke plug (21), and the axial position of the rubber sealing ring (24) is positioned between the liquid passing hole E (25) and the liquid passing hole F (23), so that the liquid passing hole E (25) and the liquid passing hole F (23) are separated.

2. The integrated salvageable drillable extrusion tool of claim 1, further comprising: the upper end of sliding sleeve is processed there is flexible claw B (38), and the outside processing of elasticity claw B (38) end has bellying (41), the inboard processing of center tube (17) has ring groove (42) that matches with this bellying (41), and bellying (41) card is in this ring groove (42), and the inboard of bellying (41) is passed through intubate (7) are spacing, simultaneously, the inboard of elasticity claw B (38) end has also processed bellying (41), the outside of intubate (7) with be provided with retreat groove (43) that match with this bellying.

3. The integrated salvageable drillable extrusion tool of claim 1, further comprising: the side face of the upper end of the sliding sleeve (22) is provided with a radial through hole, a locking block B (39) capable of sliding along the radial direction is arranged in the through hole, the inner side and the outer side of the locking block B (39) are limited by a central tube (17) and an insertion tube (7) respectively, the inner side of the central tube (17) and the outer side of the insertion tube (7) are respectively provided with an annular clamping groove (42) matched with the locking block B (39), the outer side of the locking block B (39) is clamped in the annular clamping groove (42) in the inner side of the central tube (17), and the axial position of the annular clamping groove (42) in the outer side of the insertion tube (7) is positioned between the liquid passing hole C (27);

the inner side and the outer side of the upper end of the sliding sleeve (22) are respectively provided with an O-shaped sealing ring (40), wherein the axial position of the O-shaped sealing ring (40) positioned on the outer side of the sliding sleeve (22) is positioned above the locking block B (39), and the axial position of the O-shaped sealing ring (40) positioned on the inner side of the sliding sleeve (22) is positioned between the liquid passing hole C (27) and the locking block B (39).

4. A cementing process using the integrated salvageable drillable extrusion tool of any one of claims 1 to 3, comprising the steps of:

step 1, an integrated fishing and drillable squeezing tool is put into a preset underground position through an oil pipe column;

step 2, pressing the ground into the oil pipe column to cut off the shear pin A (36), setting a slip (14) and a rubber barrel (19) on the integrated fishing and drillable squeezing tool, and then continuously driving higher pressure into the central pipe (17), wherein the pressure reaches the shearing limit of the shear pin C (30), and the shear pin C (30) is cut off;

step 3, lowering the oil pipe column again, driving the insertion pipe (7) to slide downwards by a central pipe (17) connected with the oil pipe column, inserting the lower end of the insertion pipe (7) into the inner side of the elastic claw B (39) and pushing the sliding sleeve (22) to move downwards, and then communicating the liquid passing hole E (25) with the liquid passing hole F (23) so as to open a liquid passing channel;

step 4, injecting cement slurry into the oil pipe column, enabling the cement slurry to reach the outside of the injection sleeve (26) through a liquid passing channel formed by communicating a liquid passing hole E (25) and a liquid passing hole F (23), so as to realize squeezing of the cement slurry, and injecting displacement fluid into the top of the cement slurry after the cement squeezing is finished, so that the cement slurry is discharged from the oil pipe column and the integrated fishing and drilling squeezing tool;

step 5, lifting the oil pipe column, driving the sliding sleeve (23) to move upwards by the insertion pipe (7), so that the liquid passing hole F (23) on the plug (21) is closed, continuously lifting the oil pipe column, and separating the insertion pipe (19) from the sliding sleeve (23);

step 6, pressing the central pipe (4), cutting off the shear pin C (30) when the pressure reaches the shearing limit of the shear pin C (30), and lifting the upper joint (1), the adapter (4), the insertion pipe (19) and parts connected to the three parts to the ground together by pulling up the oil pipe column;

and 7, after the cement is solidified, because the parts which cannot be lifted out of the well are all made of drillable materials, the parts left in the well can be drilled out in a drilling-out mode, or the upper end of a fishing sleeve (37) is fished by a fishing tool downwards, so that the components left in the well are fished out of the well.

Technical Field

The invention relates to the technical field of downhole operation tools for oil exploitation, in particular to an integrated fishing, drilling and squeezing tool for squeezing and injecting cement in a vertical well and an inclined well.

Background

At present, the domestic oil field is developed in the middle and later stages, many oil-water wells are exploited for decades, underground casings have a large amount of damages, the outer layers of the casings are communicated, production layers are exhausted, old wells are sealed, and the like, squeeze injection of cement is the most important technological means, the existing cement squeeze scheme mainly comprises cement squeeze injection through an oil pipe, the oil pipe is placed into the upper portion of an interval, cement is injected into the oil pipe, the process is simple, but a high-pressure layer cannot be injected, and the interlayer cannot be injected in a circulating mode, and only simple well sealing is adapted; for high pressure injection wells, the currently used process is: the bridge plug is put in through the tubular column, the bridge plug is lost and the tubular column is lifted up at the upper end of the injection layer, then the insertion pipe is put in and the bridge plug is in butt joint sealing, and the main problem of the process is that: 1. two times of running the pipe column are needed, so that the operation time is seriously influenced, and the operation cost is wasted; 2. the bridge plug has two types of fishing and drilling, the fishing bridge plug cannot adapt to the extrusion of an outer channeling layer of the sleeve, the overhaul of an oil-water well is easily caused, the bridge plug with a drilling structure protects the bridge plug from action through shear pins, and the shear pins are easily sheared after being scraped by a well wall in the process of going into the well, so that the bridge plug is prevented from being seated in advance.

Disclosure of Invention

The invention aims to solve the technical problem of providing an integrated fishing, drilling and squeezing tool which saves the operation cost and the operation time and has high pressure resistance.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the invention comprises an upper joint, a central pipe, a setting piston, a setting push sleeve, a piston sleeve, an upper cone, a lower cone, a slip sleeve and a rubber cylinder, and also comprises an auxiliary piston, an insertion pipe and a sliding sleeve, wherein the upper joint is connected with the upper end of the insertion pipe through an adapter, the upper end of the piston sleeve is sleeved on the upper joint and is locked and fixed through a threaded pressing cap, the setting piston and the auxiliary piston are both arranged in an annular space at the inner side of the piston sleeve and are connected through a shear pin A, the setting piston is slidably arranged between the setting sleeve and the insertion pipe, the upper side of the setting piston is limited through the lower end face of the adapter, the auxiliary piston is slidably arranged between the piston sleeve and the upper joint, the upper side and the lower side of the auxiliary piston are respectively limited through shaft shoulders on the upper joint and the adapter, the side face of the upper part of the setting piston is provided with a radial through hole, and a locking block A capable of sliding, a clamping groove matched with the locking block A is formed in the adapter, the inner side of the locking block A abuts against the bottom of the clamping groove, the outer side of the locking block A abuts against the inner side of the auxiliary piston, and the outer side of the lower end of the setting piston is connected with a locking sleeve A through threads;

the inserting pipe is inserted into the central pipe and connected through a shear pin C (30), the setting push sleeve is slidably mounted on the outer side of the central pipe, the upper cone and the lower cone are slidably mounted on the outer side of the setting push sleeve, and the slip sleeve is sleeved on the outer sides of the upper cone, the lower cone and the slip;

a salvaging sleeve is arranged in an annular space between the upper end of the central pipe and the upper end of the sitting seal push sleeve, an inner hole snap spring for limiting the upper side of the salvaging sleeve is arranged on the inner side of the upper end of the sitting seal push sleeve, the salvaging sleeve is connected to the central pipe through a shear pin B, salvaging threads are arranged on the outer side of the upper end of the salvaging sleeve, a snap spring hanger is arranged below the salvaging sleeve, the lower side of the snap spring hanger is limited through a shaft shoulder on the outer side of the central pipe, meanwhile, the lower end face of the snap spring hanger abuts against a shoulder on the inner side of the sitting seal push sleeve, an annular clamping groove is arranged on the outer side of the snap spring hanger, a snap spring is arranged in the annular clamping groove, stopping threads which are matched with each other are respectively arranged on the outer side of the snap spring hanger and the inner wall of the sitting seal push sleeve, a lock sleeve B is arranged on the lower end of the lock sleeve, the bulge is clamped in the annular clamping groove, the outer side of the bulge is limited by the piston sleeve, and the lower end of the lock sleeve is connected with the outer side of the upper end of the upper cone through threads;

the rubber sleeve is sleeved on the outer side of the central tube, the rubber sleeve is positioned below the slip sleeve, a middle push sleeve and a push ring are arranged between the slip sleeve and the rubber sleeve, the upper end of the middle push sleeve is inserted into an annular space between the slip sleeve and the lower cone, the inner side of the lower end of the slip sleeve is connected with a back cap through threads, the upper side and the lower side of the middle push sleeve are limited by a shaft shoulder on the lower cone and the upper end face of the back cap respectively inside the slip sleeve, the upper end of the push ring is connected to the lower end of the middle push sleeve through threads, and the lower end face of the push ring abuts against the rubber sleeve;

the lower end of the central pipe is connected with a plug through threads, and the sliding sleeve is arranged at the lower end of the central pipe and on the inner side of the plug;

the lower end of the cannula is connected with a cannula head through threads;

a liquid passing hole A for communicating the inner side space and the outer side space of the adapter is formed in the side wall of the adapter;

the side wall of the central tube is provided with a liquid passing hole B for communicating the inner side space and the outer side space of the central tube, and the axial position of the liquid passing hole B is positioned on the inner side of the middle push sleeve;

a liquid passing hole C for communicating the inner side space and the outer side space of the insertion pipe is formed in the side wall of the lower end of the insertion pipe;

the intubation head is provided with a liquid passing hole D for communicating the inner side space and the outer side space of the intubation head, and the axial direction of the liquid passing hole D is the same as that of the intubation;

a liquid passing hole E for communicating the inner side space and the outer side space of the sliding sleeve is formed in the side wall of the sliding sleeve;

the plug is provided with a liquid passing hole F for communicating the inner space and the outer space of the plug, and the axial direction of the liquid passing hole F is vertical to the axial direction of the insertion pipe;

the inner side of the central tube is provided with a rubber sealing ring for sealing a gap between the inner wall of the central tube and the outer wall of the insertion tube, and the axial position of the rubber sealing ring is positioned between the liquid passing hole B and the liquid passing hole C;

and another rubber sealing ring is arranged between the lower end surface of the central tube and the plug, and the axial position of the rubber sealing ring is positioned between the liquid passing hole E and the liquid passing hole F, so that the liquid passing hole E and the liquid passing hole F are separated.

As a further technical scheme, the upper end of the sliding sleeve is provided with an elastic claw B, the outer side of the tail end of the elastic claw B is provided with a protruding part, the inner side of the central tube is provided with an annular clamping groove matched with the protruding part, the protruding part is clamped in the annular clamping groove, the inner side of the protruding part is limited by the inserting tube, meanwhile, the inner side of the tail end of the elastic claw B is also provided with the protruding part, and the outer side of the inserting tube is provided with a retreat groove matched with the protruding part.

As a further technical scheme, a radial through hole is formed in the side face of the upper end of the sliding sleeve, a locking block B capable of sliding along the radial direction is arranged in the through hole, the inner side and the outer side of the locking block B are limited by a central tube and an insertion tube respectively, an annular clamping groove matched with the locking block B is formed in the inner side of the central tube and the outer side of the insertion tube respectively, the outer side of the locking block B is clamped in the annular clamping groove in the inner side of the central tube, and the axial position of the annular clamping groove in the outer side of the insertion tube is located between the liquid passing hole;

the inner side and the outer side of the upper end of the sliding sleeve are respectively provided with an O-shaped sealing ring, wherein the axial position of the O-shaped sealing ring positioned outside the sliding sleeve is positioned above the locking block B, and the axial position of the O-shaped sealing ring positioned inside the sliding sleeve is positioned between the liquid passing hole C and the locking block B.

The invention also provides a cementing process of the integrated fishing, drilling and squeezing tool, which is characterized by comprising the following steps of:

step 1, an integrated fishing and drillable squeezing tool is put into a preset underground position through an oil pipe column;

step 2, pressing the ground into the oil pipe column to cut off the shear pin A, further setting a slip and a rubber cylinder on the integrated fishing drillable squeezing tool, and then continuously driving higher pressure into the central pipe, wherein the pressure reaches the shear limit of the shear pin C, and the shear pin C is cut off;

step 3, lowering the oil pipe column again, driving the insertion pipe to slide downwards by a central pipe connected with the oil pipe column, inserting the lower end of the insertion pipe into the inner side of the elastic claw B, pushing the sliding sleeve to move downwards, and then communicating the liquid passing hole E with the liquid passing hole F, so that a liquid passing channel is opened;

step 4, injecting cement slurry into the oil pipe column, enabling the cement slurry to reach the outside of the injection sleeve through a liquid passing channel formed by communicating a liquid passing hole E and a liquid passing hole F, so as to realize squeezing and injection of the cement slurry, and injecting displacement fluid into the top of the cement slurry after the cement squeezing and injection is finished, so that the cement slurry is discharged from the oil pipe column and the integrated fishing and drillable squeezing and injection tool;

step 5, lifting the oil pipe column, enabling the insertion pipe to drive the sliding sleeve to move upwards, so that the liquid passing hole F in the plug is closed, continuing to lift the oil pipe column, and enabling the insertion pipe to be separated from the sliding sleeve;

step 6, lifting the oil outlet pipe column to lift the upper joint, the adapter, the insertion pipe and the parts connected to the three parts to the ground together;

and 7, after the cement is solidified, because the parts which cannot be lifted out of the well are all made of drillable materials, the parts left in the well can be drilled out in a drilling-out mode, or the upper end of a fishing sleeve is fished by a fishing tool downwards, so that the components left in the well are fished out of the well.

The invention has the beneficial effects that:

1. in the invention, the pipe insertion and the bridge plug tool are organically combined into a whole, so that the cement squeezing operation can be realized only by one time of a pipe column, thereby greatly improving the operation efficiency and reducing the operation cost.

2. The setting piston and the auxiliary piston are arranged in the device, when the setting is carried out, the setting piston executes the setting action, the auxiliary piston moves towards the direction opposite to the movement direction of the setting piston, after the setting is finished, the lower side of the setting piston abuts against a shaft shoulder on the outer side of the insertion pipe, and the upper side of the auxiliary piston abuts against a shaft shoulder on the upper joint. That is to say, after the setting is finished, the pressure applied on the two pistons finally acts on the inserting pipe and the upper joint respectively, and the central pipe and the upper joint are fixedly connected through the adapter, so the arrangement of the two pistons ensures that the self-balancing type hydraulic setting tool is in a self-balancing state after the setting is finished, the high pressure in the squeezing process is not pushed up to the oil pipe, the inserting pipe is prevented from being separated from the inner cavity of the central pipe, the inserting pipe is directly connected with the setting part and is provided with a sealing sleeve, after the setting, the pipe column can be directly lifted up or is not moved, the squeezing operation can be directly carried out in the next step, and after the setting is finished, the pipe column, the inserting pipe and the like.

3. In the present invention, there are three important connections directly related to the setting piston and the secondary piston: the first connection relation is that the setting piston is connected with the auxiliary piston through a shear pin A; the second connection relation is that the setting piston is locked on the adapter through the locking block A, and the connection relation can be released after the auxiliary piston moves upwards; the third connection relation is that the lower end of the setting piston is fixedly connected with a lock sleeve A, and an elastic claw A on the lock sleeve A is clamped in an annular groove on the outer side of the lock sleeve B under the limiting action of the piston sleeve. On the basis of a double-piston structure, the three connection relations supplement each other and coordinate to act, and the following effects are produced:

firstly, before the setting is pressed, the setting piston is locked on the adapter under the combined action of the first connection relation and the second connection relation, so that the setting piston cannot be in tandem in the process of going down the well, and meanwhile, the accidental setting under the influence of factors such as formation pressure fluctuation and the like in the process of going down the well can be prevented.

Secondly, in the third connection relation, before setting, the lock sleeve a and the lock sleeve B are firmly connected together, and in the setting process, after the setting piston moves downwards, the limiting function of the piston sleeve on the outer side of the elastic claw on the lock sleeve a is released, and in this case, when the tubular column is lifted upwards after setting is completed, the lock sleeve a can automatically separate from the lock sleeve B after moving upwards. Therefore, the invention can reliably connect the setting piston, the lock sleeve A, the lock sleeve B and the upper cone into a whole before setting, and can release the connection relation between the lock sleeve A and the lock sleeve B after setting, so that the setting piston, the setting sleeve, the upper joint, the adapter, the cannula and the lock sleeve A can be pulled out of the well after being unlocked, and the drilling time remained in the underground part can be shortened to the maximum extent by pulling out as many parts as possible of the well, thereby improving the operation efficiency.

4. In the invention, the part lost in the well is completely made of drillable materials (the concrete material can be nodular cast iron), and under the extreme condition that the part cannot be fished, the part lost in the well can be drilled out in a drilling mode. In addition, in the invention, the slips are positioned at the upper side of the rubber cylinder, and are directly contacted with the slips during drilling, so that the drilling and the removal are convenient, the downward pressure resistance is high, and the operation is safer.

5. The lower end of the invention is provided with the sliding sleeve, the sliding sleeve can be opened and closed as required when in work through the cannula to control the opening and closing of the sliding sleeve, and the opening and closing can be repeated for many times, so that the cementing process can be interrupted at any time, and various accidental problems in the operation process can be solved. The during operation can be opened the sliding sleeve through transferring the intubate to carry out crowded cement operation, cement is crowded to be annotated and is accomplished the back, can make the sliding sleeve reclose through the mode of lifting the intubate, prevents that grout from removing the back backward flow at pressure.

6. According to the invention, the fishing sleeve is arranged, after setting, the thread at the upper end of the fishing sleeve is exposed from the upper end of the setting push sleeve, after the insertion pipe is lifted out of the well, the upper end of the fishing sleeve is fished by a fishing tool and lifted, the shear pin B can be cut off, so that the clamp spring hanger 11 can move upwards to realize the deblocking of the slips and the rubber sleeve, after deblocking, the pipe column is continuously lifted, and the fishing sleeve hooks and lifts the setting push sleeve under the connection effect of the clamp spring in the inner hole, so that the well is fished out of the underground part of the well. The salvageable design can greatly reduce the operation difficulty and the construction cost and shorten the construction period.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged fragmentary view of the upper half of the invention of FIG. 1;

FIG. 3 is an enlarged fragmentary view of the upper half of the present invention of FIG. 1;

FIG. 4 is a schematic view of the lower end of the present invention with another alternative embodiment of the sliding sleeve;

FIG. 5 is a schematic illustration of the construction of an assembly of the present invention that can be lifted out of the well after completion of a squeeze;

FIG. 6 is an enlarged view of a portion of FIG. 1 at A;

FIG. 7 is an enlarged view of a portion of FIG. 1 at B;

FIG. 8 is a schematic diagram of another embodiment of an assembly that may be used with the above-described well.

In the figure, 1-upper joint, 2-thread press cap, 3-piston sleeve, 4-adapter, 5-auxiliary piston, 6-setting piston, 7-insertion pipe, 8-lock sleeve A, 9-setting push sleeve, 10-lock sleeve B, 11-clamp spring hanger, 12-slip sleeve, 13-upper cone, 14-slip, 15-lower cone, 16-middle push sleeve, 17-central pipe, 18-push ring, 19-rubber cylinder, 20-plug head, 21-plug head, 22-slide sleeve, 23-liquid passing hole F, 24-rubber sealing ring, 25-liquid passing hole E, 26-liquid passing hole D, 27-liquid passing hole C, 28-liquid passing hole B, 29-back cap, 30-shear pin C, 31-clamp spring, 32-shear pin B, 33-elastic claws A, 34-locking blocks A, 35-liquid passing holes A, 36-shear pins A, 37-fishing sleeves, 38-elastic claws B, 39-locking blocks B, 40-O-shaped sealing rings, 41-protrusions, 42-annular clamping grooves, 43-retreating grooves, 44-backstop threads, 45-inner hole clamp springs, 46-return springs, 47-steel balls and 48-conical sealing surfaces.

Detailed Description

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

as shown in fig. 1-3, the present embodiment includes an upper joint 1, a central tube 17, a setting piston 6, a setting push sleeve 9, a piston sleeve 3, an upper cone 13, a lower cone 15, slips 14, a slip sleeve 12, and a rubber tube 19, wherein the setting piston 6 is installed in the piston sleeve 3, the upper cone 13, the lower cone 15, the slips 14, the slip sleeve 12, and the rubber tube 19 are all installed outside the central tube 17, the setting push sleeve 9 is sleeved on the central tube 17, and when setting, a pressure is applied into a tubing string, the setting pressure is transmitted to the upper cone 13 through the setting push sleeve 9, and the upper cone 13 is pushed to slide downward, and then the slips 14 are forced to slide in a radial direction and the rubber tube 19 is compressed, so that the diameter of the rubber tube is increased, and setting is completed. The above is a common structure in the prior art, and is not described herein again.

As shown in fig. 2, compared with the prior art, the invention has the innovation that the invention further comprises an auxiliary piston 5, an insertion pipe 7 and a sliding sleeve 22, the insertion pipe 7 is arranged, and the insertion pipe 7 and a bridge plug tool are organically combined into a whole, so that the cement squeezing operation can be realized only by one time of a pipe column, thereby greatly improving the operation efficiency and reducing the operation cost.

As shown in fig. 2, the upper connector 1 is connected to the upper end of the insertion tube 7 through an adapter 4, the upper end of the piston sleeve 3 is sleeved on the upper connector 1 and is locked and fixed through a threaded pressing cap 2, the piston sleeve 3 is mounted in a manner that the piston sleeve 3 is naturally centered with two pistons during assembly, and the frictional resistance during assembly of the piston sleeve 3 is reduced.

The setting piston 6 and the auxiliary piston 5 are both arranged in an annular space on the inner side of the piston sleeve 3, the setting piston 6 and the auxiliary piston 5 are connected through a shear pin A36, the setting piston 6 is slidably arranged between the setting sleeve 3 and the insertion tube 7, the upper side of the setting piston 6 is limited through the lower end face of the adapter 4, the auxiliary piston 5 is slidably arranged between the piston sleeve 3 and the upper connector 1, the upper side and the lower side of the auxiliary piston 5 are limited through shaft shoulders on the upper connector 1 and the adapter 4 respectively, a radial through hole is arranged on the side face of the upper part of the setting piston 5, the radial through hole is internally provided with a lock block A34 capable of sliding along the radial direction, the adapter 4 is provided with a clamping groove matched with the lock block A34, the inner side of the lock block A34 abuts against the groove bottom of the clamping groove, the outer side of the lock block A34 abuts against the inner side of the auxiliary piston 5, and the outer side of the lower end of the setting piston 6 is connected with a lock sleeve A8 through threads.

The invention is internally provided with a setting piston 6 and an auxiliary piston 5, when setting, the setting piston 6 executes setting action, the auxiliary piston 5 moves towards the direction opposite to the movement direction of the setting piston 6, after the setting is finished, the lower side of the setting piston 6 is propped against a shaft shoulder on the outer side of the insertion pipe 7, and the upper side of the auxiliary piston 5 is propped against a shaft shoulder on the upper joint 1. That is to say, after setting is completed, the pressures applied to the two pistons finally act on the insertion pipe 7 and the upper joint 1 respectively, and the central pipe 17 and the upper joint 1 are fixedly connected through the adapter 4, so the arrangement of the two pistons ensures that the self-balancing state is achieved after setting of the tool is completed, the high pressure in the extrusion process is not pushed up to an oil pipe, the insertion pipe 7 is prevented from being separated from the inner cavity of the central pipe 17, the insertion pipe 7 is directly connected with the setting part and is provided with a sealing sleeve, after setting, the pipe column can be directly lifted or is not moved, the next-step extrusion operation can be directly carried out, and after completion, the pipe column is lifted, the insertion pipe 7 and the like are lifted out of the well.

In the present invention, there are three important connections directly related to the setting piston 6 and the secondary piston 5: the first connection relation is that the setting piston 6 is connected with the auxiliary piston 5 through a shear pin A36; the second connection is that the setting piston 6 is locked on the adapter 4 by the locking piece a34 and the connection can be released after the secondary piston 5 moves upwards; the third connection relation is that the lower end of the setting piston 6 is fixedly connected with a lock sleeve A8, and an elastic claw A33 on the lock sleeve A8 is clamped in an annular groove 42 on the outer side of the lock sleeve B10 under the limiting action of the piston sleeve 3. On the basis of a double-piston structure, the three connection relations supplement each other and coordinate to act, and the following effects are produced:

firstly, before the setting is pressed, the setting piston 6 is locked on the adapter 4 under the combined action of the first connection relation and the second connection relation, so that the setting piston 6 cannot be in series connection in the process of going down the well, and meanwhile, the accidental setting under the influence of factors such as formation pressure fluctuation and the like in the process of going down the well can be prevented.

Secondly, in the third connection relation, before setting, the lock sleeve A8 is firmly connected with the lock sleeve B10, and in the setting process, after the setting piston 6 moves downwards, the piston sleeve 3 releases the limiting function of the outer side of the elastic claw a33 on the lock sleeve A8, in this case, when the pipe column is lifted up after setting, the lock sleeve A8 moves upwards and then can be automatically separated from the lock sleeve B10. Therefore, the invention can not only reliably connect the setting piston 6, the lock sleeve A8, the lock sleeve B10 and the upper cone 13 into a whole before setting, but also release the connection relationship between the lock sleeve A8 and the lock sleeve B10 after setting, so that the setting piston 6, the setting sleeve 3, the upper joint 1, the adapter 4, the cannula 7 and the lock sleeve A8 can be lifted out of the well after being unlocked, and the drilling time remained in the underground part can be shortened to the maximum extent by lifting as many parts out of the well as possible, thereby improving the operation efficiency.

The inserting pipe 7 is inserted into the central pipe 17 and connected through a shear pin C30, the setting push sleeve 9 is slidably mounted on the outer side of the central pipe 17, the upper cone 13 and the lower cone 15 are both slidably mounted on the outer side of the setting push sleeve 9, and the slip sleeve 12 is sleeved on the outer sides of the upper cone 13, the lower cone 15 and the slips 14.

The annular space between the upper end of the central pipe 17 and the upper end of the setting push sleeve 9 is internally provided with a fishing sleeve 37, the inner side of the upper end of the setting push sleeve 9 is provided with an inner hole snap spring 45 used for limiting the upper side of the fishing sleeve 37, the fishing sleeve 37 is connected to the central pipe 17 through a shear pin B32, and the outer side of the upper end of the fishing sleeve 37 is provided with fishing threads. After setting, the thread at the upper end of the fishing sleeve 37 is exposed from the upper end of the setting push sleeve 9, after the inserting pipe 7 is pulled out of the well, the upper end of the fishing sleeve 37 is fished by a fishing tool and lifted, the shear pin B32 can be cut off, the snap spring hanger 11 can move upwards, the slip 14 and the rubber sleeve 19 are unsealed, after unsealing, the pipe column is continuously lifted, the fishing sleeve 37 hooks and lifts the setting push sleeve 9 under the connecting action of the inner hole snap spring 45, and therefore the downhole part of the invention is fished out of the well. The salvageable design can greatly reduce the operation difficulty and the construction cost and shorten the construction period.

Salvage the below of cover 37 and be provided with jump ring and hang 11, the downside that the jump ring hung 11 is spacing through the shaft shoulder in the center tube 17 outside, simultaneously, the lower terminal surface that the jump ring hung 11 supports on the shoulder of seat and sealing push away the inboard 9, the outside that the jump ring hung 11 is provided with ring groove 42, install jump ring 31 in the ring groove 42, be provided with the stopping screw thread 44 of mutually supporting respectively on the outside of jump ring 31 and the inner wall of seat and sealing push away set 9, jump ring 31 and stopping screw thread 44 are common structures in the downhole tools such as packer, jump ring 31 and stopping screw thread 44 cooperate, jump ring 31 can only follow stopping screw thread 44 downstream, and can not reverse movement, thereby guaranteed the irreversibility of seat process.

The outside of setting push sleeve 9 is provided with lock cover B10, the lower extreme of lock cover A8 is provided with elasticity claw A33, and the inboard processing at elasticity claw A33 end has bellying 41, the outside processing of lock cover B10 upper end have with bellying 41 matched's ring groove 42, bellying 41 card is in this ring groove 42, and the outside of bellying 41 is passed through piston bush 3 is spacing to lock cover A8 on lock cover B10.

The lower end of the lock sleeve 10 is connected with the outer side of the upper end of the upper cone 13 through threads;

the rubber sleeve 19 is sleeved on the outer side of the central tube 17, the rubber sleeve 19 is located below the slip sleeve 12, a middle push sleeve 16 and a push ring 18 are arranged between the slip sleeve 12 and the rubber sleeve, the upper end of the middle push sleeve 16 is inserted into an annular space between the slip sleeve 12 and the lower cone 15, the inner side of the lower end of the slip sleeve 12 is connected with a back cap 29 through threads, the upper side and the lower side of the middle push sleeve 16 are limited by a shaft shoulder on the lower cone 15 and the upper end face of the back cap 29 inside the slip sleeve 12 respectively, the upper end of the push ring 18 is connected to the lower end of the middle push sleeve 16 through threads, and the lower end face of the push ring 18 abuts against the rubber sleeve 19. In the invention, the slips 14 are positioned at the upper side of the rubber barrel 19, and the slips 14 are directly contacted during drilling and removing, so that the drilling and removing are convenient, the downward pressure resistance is high, and the operation is safer.

The lower end of the central tube 17 is connected with a plug 21 through threads, and the sliding sleeve 22 is arranged at the lower end of the central tube 17 and on the inner side of the plug 21;

the lower end of the cannula 7 is connected with a cannula head 20 through threads;

a liquid passing hole A35 for communicating the inner side space and the outer side space of the adapter 4 is formed in the side wall of the adapter 4;

a liquid passing hole B28 for communicating the inner side space and the outer side space of the central tube 17 is formed in the side wall of the central tube 17, and the axial position of the liquid passing hole B is positioned on the inner side of the middle push sleeve 16;

a liquid passing hole C27 for communicating the inner side space and the outer side space of the insertion pipe 7 is formed in the side wall of the lower end of the insertion pipe 7;

the cannula head 20 is provided with a liquid passing hole D26 for communicating the inner side space and the outer side space of the cannula head 20, and the axial direction of the liquid passing hole D26 is the same as the axial direction of the cannula 7;

the side wall of the sliding sleeve 22 is provided with a liquid passing hole E25 for communicating the inner side space and the outer side space of the sliding sleeve 22;

the plug 21 is provided with a liquid passing hole F23 for communicating the inner space and the outer space of the plug 21, and the axial direction of the liquid passing hole F23 is vertical to the axial direction of the insertion tube 7;

a rubber sealing ring 24 for sealing a gap between the inner wall of the central tube 17 and the outer wall of the insertion tube 7 is arranged on the inner side of the central tube 17, and the axial position of the rubber sealing ring 24 is positioned between the liquid passing hole B28 and the liquid passing hole C27;

another rubber sealing ring 24 is installed between the lower end face of the central tube 17 and the plug 21, and the axial position of the rubber sealing ring 24 is located between the liquid passing hole E25 and the liquid passing hole F23, so that the liquid passing hole E25 and the liquid passing hole F23 are separated.