阅读说明：本技术 一种送放工具 (Delivery tool ) 是由 侯治民 雷炜 钱江 胡顺渠 李腾飞 叶翠莲 刘涛 周怡君 于 2020-06-12 设计创作，主要内容包括：本发明提出了一种送放工具,包括中空的中心杆,所述中心杆中部设置有流道；套设在所述中心杆上的卡瓦机构,所述卡瓦机构包括固定在所述中心杆上的卡瓦固定筒,以及设置在所述卡瓦固定筒和所述中心杆之间的卡瓦驱动筒；所述卡瓦固定筒上设置有可沿径向伸出的卡瓦,所述卡瓦的外壁上设置有外马牙扣；与所述中心杆套接的回接筒,所述回接筒的内壁上设置有内马牙扣,所述卡瓦沿径向向外伸出时所述外马牙扣和所述内马牙扣相互咬合；其中,所述卡瓦驱动筒在所述中心杆上移动而推动所述卡瓦沿径向伸出或收缩。本发明采用承力更高的卡瓦支撑式结构,遇阻时更容易解卡,同时采用旋转加投球两种丢手方式,丢手更可靠。(The invention provides a delivery tool, which comprises a hollow central rod, wherein the middle part of the central rod is provided with a flow passage; the slip mechanism is sleeved on the central rod and comprises a slip fixing cylinder fixed on the central rod and a slip driving cylinder arranged between the slip fixing cylinder and the central rod; slips capable of extending out along the radial direction are arranged on the slip fixing cylinder, and an outer jaw buckle is arranged on the outer wall of each slip; the inner wall of the tieback cylinder is provided with an inner horse-tooth buckle, and the outer horse-tooth buckle and the inner horse-tooth buckle are mutually meshed when the slip extends outwards along the radial direction; wherein the slip drive drum moves on the center rod to push the slips radially outward or inward. The invention adopts a slip supporting type structure with higher bearing capacity, is easier to release the block when meeting the resistance, and simultaneously adopts two releasing modes of rotation and ball throwing, so that the releasing is more reliable.)

1. A delivery tool, comprising:

the hollow center rod (1), the middle part of the center rod (1) is provided with a flow channel (11);

the slip mechanism is sleeved on the central rod (1) and comprises a slip fixing cylinder (12) fixed on the central rod (1) and a slip driving cylinder (13) arranged between the slip fixing cylinder (12) and the central rod (1); the slip fixing cylinder (12) is provided with a slip (14) which can extend out along the radial direction, and the outer wall of the slip (14) is provided with an outer jaw buckle (15); and

the inner side of the tieback cylinder (3) is provided with an inner horse-tooth buckle (32), and the outer horse-tooth buckle (15) and the inner horse-tooth buckle (32) are mutually meshed when the slip (14) extends outwards along the radial direction;

wherein the slip driving drum (13) moves on the center rod (1) to push the slips (14) to extend or retract in a radial direction.

2. Delivery tool according to claim 1, characterized in that the upper end of the central rod (1) is provided with an upper joint (2) for connection to an upstream assembly, and the lower end is provided with a guide head (30); the end part of the guide head (30) is provided with a guide inclined plane, and when the connecting rod is connected with the connecting rod (3), the guide inclined plane moves inwards along the inner wall of the connecting rod (3).

3. The running tool according to claim 1 or 2, characterized in that the lower end of the slip retaining cylinder (12) is connected to the lower part of the center rod (1) and the distance between the middle and upper part of the slip retaining cylinder (12) and the center rod (1) is such that an annular first cavity (16) is formed; the slip driving cylinder (13) is arranged inside the first cavity (16); urging the slips (14) to move radially as the slip drive drum (13) moves axially within the first chamber (16).

4. The running tool according to claim 3, wherein the outer wall of the slip driving cylinder (13) is provided with a first concave-convex structure, the first concave-convex structure comprises first protrusions (18), and first grooves (19) are arranged between the first protrusions (18); a second concave-convex structure is arranged on the inner wall of the slip (14), the second concave-convex structure comprises second protrusions (20), and second grooves (21) are formed between the second protrusions (20);

when the slip driving cylinder (13) is in a first position, the first protrusion (18) is opposite to the second protrusion (20), and the slips (14) are in an extending state; when the slip driving cylinder (13) is in the second position and the first protrusion (18) slides into the second groove (21), the slips (14) are in a contracted state.

5. The running tool according to claim 4, characterized in that a second cavity (17) is provided between the centre rod (1) and the upper joint (2), and the upper end of the slip drive drum (13) is provided within the second cavity (17); a locking block (25) is arranged on the slip driving cylinder (13) and positioned between the upper joint (2) and the slip fixing cylinder (12);

the locking block (25) is adjacent the upper sub (2) when the slip drive drum (13) is in a first position; the locking block (25) is adjacent the slip retaining cylinder (12) when the slip drive cylinder (13) is in the second position.

6. The running tool according to claim 5, wherein the slip drive cylinder (13) is connected to the top sub (2) by an actuating pin (26) when the slip drive cylinder (13) is in the first position.

7. The running tool according to claim 6, characterized in that the central rod (1) is provided with a pressure transfer hole (27) communicating the flow channel (11) and the second cavity (17), and the central rod (1) is provided with a ball seat (28), wherein the ball seat (28) is located below the pressure transfer hole (27).

8. Running tool according to any one of claims 1 to 7, characterized in that the outer and inner buttons (15, 32) are screw buttons, the return barrel (3) being rotatably connected to or disconnected from the slips (14) when the slips (14) are in the extended state.

9. Tool for running according to claim 8, characterized in that the lower end of the slip retaining cylinder (12) is provided with an inclined first step structure (29) and the interior of the tieback cylinder (3) is provided with a second step structure (33) matching the first step structure (29).

10. Delivery tool according to claim 9, characterized in that the lower part of the central rod (1) is provided with an elastic sealing means (31), the elastic sealing means (31) sealing the contact surface between the take-back cylinder (3) and the central rod (1) when the take-back cylinder (3) is connected to the central rod (1).

Technical Field

The invention relates to a delivery tool, and belongs to the field of oil and gas development tools.

Background

Along with the development of oil and gas reservoirs is promoted to a low-permeability compact reservoir, wells are deeper and deeper, particularly horizontal sections of horizontal wells are longer and longer, in the process of running a pipe column, the friction force of the pipe column in the horizontal section is large, the running difficulty of the pipe column is large, the pipe column needs to be run in two times, the lower portion of the pipe column is distributed in place and then released after the lower portion of the pipe column is distributed in place firstly, a tail pipe suspension mode or the upper portion of the pipe column is connected back to the upper portion of the pipe column directly, a traditional feeding and releasing tool is used as one part of a tool and cannot be combined randomly, the application range is limited, meanwhile, a spring plate horse tooth buckling mode is mostly adopted, the bearing tension of the traditional feeding and releasing tool is limited, if the pipe column runs in and meets resistance, the space for lifting tension of a release card is limited, most of releasing modes are single, and if the releasing is unsuccessful, no rescue measures are taken.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a delivery tool which adopts a slip supporting type structure with higher bearing force, is easier to release a block when meeting a resistance, and adopts two releasing modes of rotation and ball throwing, so that the releasing is more reliable.

In order to achieve the above object, the present invention provides a feeding tool, including:

the center rod is hollow, and a flow channel is arranged in the middle of the center rod;

the slip mechanism is sleeved on the central rod and comprises a slip fixing cylinder fixed on the central rod and a slip driving cylinder arranged between the slip fixing cylinder and the central rod; slips capable of extending out along the radial direction are arranged on the slip fixing cylinder, and an outer jaw buckle is arranged on the outer wall of each slip; and

the inner wall of the tieback cylinder is provided with an inner horse-tooth buckle, and the outer horse-tooth buckle and the inner horse-tooth buckle are mutually meshed when the slip extends outwards along the radial direction;

wherein the slip drive drum moves on the center rod to push the slips radially outward or inward.

The invention is further improved in that the upper end of the central rod is provided with an upper joint connected with an upstream assembly, and the lower end of the central rod is provided with a guide head; the end part of the guide head is provided with a guide inclined surface, and when the guide head is connected with the connecting back cylinder, the guide inclined surface moves inwards along the inner wall of the connecting back cylinder.

The invention is further improved in that the lower end of the slip fixing cylinder is connected with the lower part of the center rod, and a certain distance is reserved between the middle part and the upper part of the slip fixing cylinder and the center rod to form an annular first cavity; the slip driving cylinder is arranged inside the first cavity; the slips are urged to move radially as the slip drive drum moves axially within the first chamber.

The slip driving device is further improved in that a first concave-convex structure is arranged on the outer wall of the slip driving cylinder, the first concave-convex structure comprises first bulges, and first grooves are formed between the first bulges; a second concave-convex structure is arranged on the inner wall of the slip and comprises second bulges, and second grooves are formed between the second bulges;

when the slip driving cylinder is at a first position, the first protrusion is opposite to the second protrusion, and the slip is in an extending state; when the slip driving cylinder is located at the second position and the first protrusion slides into the second groove, the slips are in a contracted state.

The invention has the further improvement that a second cavity is arranged between the center rod and the upper joint, and the upper end of the slip driving cylinder is arranged in the second cavity; a locking block is arranged on the slip driving cylinder and positioned between the upper joint and the slip fixing cylinder;

when the slip drive drum is in a first position, the locking block is adjacent the upper sub; when the slip driving cylinder is at the second position, the locking block is close to the slip fixing cylinder.

The slip driving cylinder is connected with the upper joint through a starting pin when the slip driving cylinder is located at the first position.

The invention is further improved in that the center rod is provided with a pressure transfer hole for communicating the flow passage and the second cavity, and the center rod is provided with a ball seat which is positioned below the pressure transfer hole.

In a further improvement of the present invention, the outer and inner male threads are both threaded threads, and the return cylinder is rotatably connected to or disconnected from the slip when the slip is in an extended state.

The invention is further improved in that the lower end of the slip fixing cylinder is provided with an inclined first step structure, and the interior of the return cylinder is provided with a second step structure matched with the first step structure.

A further improvement of the invention is that the lower part of the central rod is provided with an elastic sealing means which seals the contact surface between the tieback cylinder and the central rod when the tieback cylinder is connected to the central rod.

Compared with the prior art, the invention has the advantages that:

the delivery tool has a split type structure with the lower part capable of being connected with various tubular columns, adopts a slip supporting type structure with higher bearing force, is easier to release a block when encountering a resistance, and adopts two releasing modes of rotation and ball throwing, so that the releasing is more reliable.

The invention can be used with a suspension packer, can be used as a sending and releasing tool which does not need to be connected back to a wellhead, and can also be used as a sending and releasing tool which is difficult to put into a horizontal well and needs to adopt a drill rod or a drill collar to increase the weight of an upper pipe column.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic structural view of a delivery tool according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of a center rod configuration showing slips in an extended condition according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of a center rod configuration showing slips in a retracted state according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a tieback cylinder according to an embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

The meaning of the reference symbols in the drawings is as follows: 1. the slip driving device comprises a central rod, 2, an upper connector, 3, a tie-back cylinder, 11, a flow channel, 12, a slip fixing cylinder, 13, a slip driving cylinder, 14, a slip, 15, an outer jaw fastener, 16, a first cavity, 17, a second cavity, 18, a first protrusion, 19, a first groove, 20, a second protrusion, 21, a second groove, 22, a first inclined surface, 23, a second inclined surface, 24, a third inclined surface, 25, a locking block, 26, a starting pin, 27, a pressure transmission hole, 28, a ball seat, 29, a first step structure, 30, a guide head, 31, an elastic sealing device, 32, an inner jaw fastener, 33 and a second step structure.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 schematically shows a delivery tool according to an embodiment of the invention, which adopts a slip support type structure with higher bearing force, is easier to release in case of resistance, and adopts two releasing modes of rotation and ball throwing, so that the releasing is more reliable.

The feeding tool according to one embodiment shown in fig. 1 and 2 includes a central rod 1, wherein the central rod 1 is a hollow structure, and a flow passage 11 is formed in the central portion of the central rod and penetrates through the central rod. The outside of the central rod 1 is provided with a slip mechanism which is of an approximately cylindrical structure and is sleeved in the middle of the central rod 1. The slip mechanism comprises a slip fixing cylinder 12, and the slip fixing cylinder 12 is fixedly connected with the central rod 1. The slip fixing cylinder 12 is provided with a plurality of slips 14, the slips 14 can be extended or retracted in a radial direction, and the outer wall of the slips 14 is provided with an outer dog clutch 15. In this embodiment, the slip mechanism further includes a slip driving cylinder 13, and the slip driving cylinder 13 moves axially on the center rod 1, and the slip driving cylinder 13 can drive the slips 14 to extend or retract when moving. The delivery tool described in this embodiment further includes a tieback cylinder 3, and the tieback cylinder 3 may be connected to the central rod 1. Wherein, the inner wall of the tieback cylinder 3 is provided with an inner tinsel button 32, and when the tieback cylinder 3 is sleeved at the lower part of the center rod 1, the outer tinsel button 15 and the inner tinsel button 32 are mutually engaged when the slips 14 extend outwards along the radial direction. The inner and outer molar buttons 32, 15 are both reverse molar buttons.

In use of the running tool according to the present embodiment, a slip drive drum 13 is provided on the centre rod 1, the slip drive drum 13 being capable of driving the slips 14 radially out and back in order to facilitate connection to the tieback drum 3. In the initial state, the slips 14 are in an extended state, the slips 14 are connected to the tieback barrel 3 by engaging the inner and outer dogs 32, 15, and the slips 14 are separated from the tieback barrel 3 by retracting the slips 14 as the slip driving barrel 13 is moved axially.

In one embodiment, the upper end of the central rod 1 is provided with an upper nipple 2, said upper nipple 2 being used for connecting upstream components. In this embodiment, an inner wall of a lower portion of the upper joint 2 is provided with an inner thread, an outer wall of an upper portion of the central rod 1 is provided with an outer thread, and an upper portion of the central rod 1 is inserted into a lower portion of the upper joint 2 and connected to the lower portion through a thread. The lower end of the central rod 1 is provided with a guide head 30, the end part of the guide head 30 is provided with a guide inclined surface, and when the connecting rod is connected with the connecting cylinder 3, the guide inclined surface moves inwards along the inner wall of the connecting cylinder 3.

In one embodiment, the lower end of the slip fixing cylinder 12 is connected to the lower portion of the center rod 1, an annular step is circumferentially provided on the lower portion of the slip fixing cylinder 12, and the lower end of the slip fixing cylinder 12 is fixed on the annular step. The slip fixing cylinder 12 has a certain distance between the middle and upper portions thereof and the center rod 1, and forms a first cavity 16 in a ring shape. The lower portion of the slip drive drum 13 extends into the first cavity 16 and is able to slide within the first cavity 16. The slips 14 are urged to move radially as the slip drive drum 13 moves axially within the first chamber 16.

In one embodiment, the slip drive drum 13 is provided with a first relief structure on an outer wall thereof. The first concave-convex structure comprises a plurality of first protrusions 18 which are vertically arranged, wherein the first protrusions 18 are arranged around the outer wall of the slip driving cylinder 13 in a circle, and the number and the positions of the first protrusions correspond to those of the slips 14. A first groove 19 is provided between the two first relief structures. Thus, the cross section of the first concavo-convex structure is a saw-toothed structure in which the first protrusions 18 and the first grooves 19 are alternately arranged. The second concave-convex structure comprises a plurality of second protrusions 20 vertically arranged and second grooves 21 arranged between the second protrusions 20, and the structure of the second concave-convex structure is similar to that of the first concave-convex structure. The second recess 21 and the first projection 18 are complementary in shape and the second projection 20 and the first recess 19 are complementary in shape.

In use, the slip drive drum 13 has two stable positions during sliding, including a first position and a second position. When the slip driving cylinder 13 is at the first position, the first protrusion 18 is opposite to the second protrusion 20, and the slips 14 are in an extending state; when the slip driving cylinder 13 is at the second position, the slips 14 are in a contracted state when the first protrusion 18 slides into the second groove 21.

The side surface of the transition of the first protrusion 18 and the first groove 19 is set as a first inclined surface 22, the side surface of the transition of the second protrusion 20 and the second groove 21 is set as a second inclined surface 23, and the gradients of the first inclined surface 22 and the second inclined surface 23 are matched. The slip drive cylinder 13 can be moved from a first position to a second position, or vice versa, by the first and second inclined surfaces 22, 23 when the slip drive cylinder 13 is moving.

In a preferred embodiment, the slip driving cylinder 13 is provided with a third inclined surface 24, and the third inclined surface 24 is provided on the uppermost edge of the first groove 19, and is engaged with the uppermost edge of the second protrusion 20 during the downward movement to perform a limiting function.

In one embodiment, a second cavity 17 is provided between the center rod 1 and the top sub 2, the upper end of the slip drive drum 13 is disposed within the second cavity 17, and the slip drive drum 13 is slidable within the second cavity 17. The slip driving cylinder 13 is provided with a locking block 25, and the locking block 25 is positioned on the outer wall of the slip driving cylinder 13 and is arranged between the upper connector 2 and the slip 14 fixing seat. The locking block 25 moves up and down as the slip drive drum 13 moves up and down, the locking block 25 being in an upper position, adjacent the upper joint 2, when the slip drive drum 13 is in the first position; when the slip drive cylinder 13 is in the second position, the locking block 25 is in a lower position adjacent the slip retaining cylinder 12.

In using the running tool according to the present embodiment, the position of the slip drive drum 13 is adjusted by operating the locking block 25 when connecting the centre rod 1 and the tieback drum 3. When the locking block 25 is moved up, the slip drive drum 13 is in the first position, the slips 14 are extended and the centre rod 1 is connected to the tieback drum 3. When the locking block 25 is tripped to the lower part, the slip drive drum 13 is in the second position, the slips 14 are retracted and the centre rod 1 and tieback drum 3 are disengaged.

In one embodiment, a radial through hole is arranged on the upper connector 2, a hole opposite to the through hole is arranged on the slip driving cylinder 13, when the slip driving cylinder 13 is located at the first position, the through hole of the upper connector 2 corresponds to the hole of the slip driving cylinder 13, and at this time, the slip driving cylinder 13 and the upper connector 2 can be connected through the starting pin 26, and the starting pin 26 penetrates through the through hole to be clamped in the hole to complete connection.

In one embodiment, the upper part of the central rod 1 is provided with pressure transfer holes 27, the pressure transfer holes 27 being arranged radially. The inner side of the pressure transfer hole 27 is communicated with the flow passage 11 of the central rod 1, and the outer side of the pressure transfer hole 27 is communicated with the second cavity 17. The flow passage 11 and the second cavity 17 can be communicated through the pressure transfer hole 27, and the pressure of the flow passage 11 and the pressure of the second cavity 17 are ensured to be the same. In this embodiment, a ball seat 28 is provided on the center rod 1, and the ball seat 28 is located below the pressure transfer hole 27.

When the pressure-retaining ball is put into the well, the pressure-retaining ball is thrown into the flow passage 11 through a ball throwing mode at the well head, and when the pressure-retaining ball moves to the ball seat 28, the pressure-retaining ball is clamped on the ball seat 28 and enables the flow passage 11 to be pressed. At this time, the pressure in the flow path 11 rises, and the pressure in the second chamber 17 rises by the pressure transfer hole 27. When the pressure in the second cavity 17 increases to a certain value, the pin is sheared, and the slip driving cylinder 13 is pushed to move downwards. Thereby moving the slip drive drum 13 from the first position to the second position.

In one embodiment, the outer and inner purslane buttons 15, 32 are each turnbuckles, and the return barrel 3 is rotatably connected to or disconnected from the slips 14 when the slips 14 are in the extended state. Thus, the slips 14 and the tieback cylinder 3 may be connected in two ways, one by adjusting the slip driving cylinder 13 to move the slips 14 radially and the other by rotating a turnbuckle to be connected in a threaded manner.

In one embodiment, the lower end of the slip retaining cylinder 12 is provided with an inclined first step structure 29, and the first step structure 29 is provided at the location where the slip retaining cylinder 12 is connected to the central rod 1. The interior of the tieback cylinder 3 is provided with a second step formation 33 matching the first step formation 29.

In one embodiment, the lower part of the center rod 1 is provided with an elastic sealing means 31, and when the tieback cylinder 3 is connected to the center rod 1, the elastic sealing means 31 seals the contact surface between the tieback cylinder 3 and the center rod 1. In the second cavity 17, a sealing element is arranged between the slip 14 driving pipe and the central rod 1, a sealing element is also arranged between the slip 14 driving pipe and the upper joint 2, and through the arrangement of a sealing device and the sealing element, fluid is prevented from flowing out from a connected gap to influence the working effect of the fluid.

The assembly and delivery modes are divided into two types:

the first assembly mode: the assembly is carried out in the manner of figure 2, in which the slip 14 locking blocks 25 are slid into position adjacent the upper joint 2, with the slip drive drum 13 in the first position and the slips 14 in the ejected condition. The actuating pin 26 is then installed to connect the slip drive barrel 13 to the top sub 2, thereby immobilizing the position of the slips 14. And then the connecting back cylinder 3 is connected in a screwing mode, and after the first step structure 29 and the second step structure 33 are overlapped, the assembled tool is connected to the pipe column and enters the well along with the pipe column.

The second assembly mode: the assembly is carried out in the manner of figure 3, in which the locking blocks 25 are slid into a position to be opened into the slip retaining cylinder 12, with the slips 14 in a retracted condition. The tieback 3 is inserted and the slip drive drum 13 is moved to a second position by adjusting the position of the locking block 25 and the slips 14 are extended and connected to the tieback 3. Installing the starting pin 26, fixing the locking block 25, and putting the tool by reverse rotation until the first step and the second step are overlapped, wherein after the tool is assembled, as shown in figure 1, the assembled tool is connected to the pipe column and enters the well along with the pipe column.

The water loss is divided into two modes: the first mode is as follows: lifting the pipe column to calculate a neutral point, and reversing the pipe column to discharge and deliver the tool through positive rotation in a second mode: if the back-off is unsuccessful, the ball can be thrown from the wellhead, the ball falls on the ball seat 28 position of the center rod 1, the pressure is pressed through the wellhead, when the pressure reaches the shearing value of the starting pin 26, the starting pin 26 is sheared, the locking block 25 descends, the slip driving cylinder 13 is changed into the second position, the slip 14 is in the retraction state, at the moment, the slip 14 is separated from the tie-back cylinder 3, and the sending and releasing tool can be pulled out.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.