CN111927379B

CN111927379B - Bypass packer

Info

Publication number: CN111927379B
Application number: CN202011093474.7A
Authority: CN
Inventors: 武洪鑫; 顾海瑞; 尹玉超; 尚华振
Original assignee: Dongying Ruifeng Petroleum Technology Development Co ltd
Current assignee: Dongying Ruifeng Petroleum Technology Development Co ltd; Qingdao Ruixin Petroleum Equipment Manufacturing Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2020-12-15
Anticipated expiration: 2040-10-14
Also published as: CN111927379A

Abstract

The invention provides a bypass packer, which relates to the technical field of well completion tools for layered gravel packing of oil and gas fields, and comprises a central pipe, a bypass connecting rod, an upper insertion pipe, a central insertion pipe, a bypass channel assembly and a setting assembly; the bypass connecting rod is connected in the central tube in a sealing manner, and a pressure transfer hole and a first wall clamping channel which are not communicated with each other are arranged on the bypass connecting rod; the upper end of the bypass connecting rod is fixedly connected with the upper insertion pipe, and a first annular space is formed between the upper insertion pipe and the central pipe; the lower end of the bypass connecting rod is fixedly connected with the central insertion pipe, and a second annular space is formed between the central insertion pipe and the central pipe; the bypass channel assemblies are connected with the central pipe and the upper end of the upper insertion pipe; the setting assembly includes a first sealed space and a sealing assembly. The packer solves the technical problems that in the well completion of gravel filling of an oil and gas field, the existing packer respectively fills gravel in each layer, the operation steps are complicated, and the efficiency is low in the prior art.

Description

Bypass packer

Technical Field

The invention relates to the technical field of well completion tools for layered gravel packing of oil and gas fields, in particular to a bypass packer.

Background

In the well completion of oil and gas field gravel packing, to the oil and gas well that needs layering sand control, the technique in the past need be gone into many times tubular columns, carries out gravel packing sand control to each layer respectively, has now although once multilayer gravel packing technique, can realize that one time tubular column accomplishes gravel packing, has improved efficiency to a certain extent, still need carry out gravel packing many times, carries out gravel packing respectively to each layer, and the operating procedure is numerous and diverse, and efficiency is lower.

Disclosure of Invention

The invention aims to provide a bypass packer to solve the technical problems that in the prior art, in the gravel packing completion of an oil and gas field, the prior packer separately packs each layer of gravel, the operation steps are complicated, and the efficiency is low.

The embodiment of the invention provides a bypass packer, which comprises a central pipe, a bypass connecting rod, an upper insertion pipe, a central insertion pipe, a bypass channel assembly and a setting assembly, wherein the central pipe is fixedly connected with the upper insertion pipe; the bypass connecting rod is hermetically connected in the central tube, and a pressure transfer hole and a first wall clamping channel which are not communicated with each other are arranged on the bypass connecting rod; the upper end of the bypass connecting rod is fixedly connected with the upper insertion pipe, and a first annular space is formed between the upper insertion pipe and the central pipe; the lower end of the bypass connecting rod is fixedly connected with the central insertion pipe, and a second annular space is formed between the central insertion pipe and the central pipe; the first annular space and the second annular space are both in communication with the first chuckwall channel; the bypass channel assembly is connected with the central pipe and the upper end of the upper insertion pipe, the bypass channel assembly is provided with a bypass channel, the bypass channel can be opened or closed through a switch tool, and the bypass channel can be communicated with the first annular space in an open state and used for conveying gravel downwards; the setting assembly comprises a first sealing space and a sealing assembly, the first sealing space is communicated with the pressure transmission hole and used for enabling liquid pressure to enter the first sealing space through the pressure transmission hole, the sealing assembly is sleeved on the central pipe, and the sealing assembly is tightly abutted against the well wall when the liquid pressure of the first sealing space reaches a set value.

Furthermore, the bypass channel assembly comprises a connecting pipe and a switch sliding sleeve arranged in the connecting pipe, the connecting pipe comprises an upper connecting pipe, a middle connecting pipe and a lower connecting pipe which are fixedly connected from top to bottom in sequence, and the lower end of the lower connecting pipe is fixedly connected with the central pipe; the upper connecting pipe is provided with a second double-wall channel, and the lower connecting pipe is provided with a third double-wall channel; the first end of the switch sliding sleeve is connected with the upper connecting pipe in a sealing mode through a first sealing structure, the second end of the switch sliding sleeve is connected with the lower connecting pipe in a sealing mode through a second sealing structure, a middle space is formed between the switch sliding sleeve and the middle connecting pipe, and the second double-wall channel, the third double-wall channel and the middle space form the bypass channel; the switch sliding sleeve can move along the axial direction of the connecting pipe to open or close the bypass channel.

Furthermore, the lower end of the switch sliding sleeve is provided with a locking claw which comprises an elastic claw part; the lower connecting pipe is provided with a first limiting groove and a second limiting groove which are matched with the elastic claw part, and the first limiting groove and the second limiting groove are arranged at intervals along the axial direction of the lower connecting pipe; when the elastic claw part is limited in the first limiting groove, the switch sliding sleeve is connected with the middle connecting pipe in a sealing mode through a third sealing structure, and the middle space is divided into two parts which are not communicated; when the elastic claw part is limited in the second limiting groove, the second clamping wall channel is communicated with the third clamping wall channel through the middle space.

Further, a third limiting groove is further arranged in the upper connecting pipe, and the third limiting groove is inwards recessed along the radial direction of the upper connecting pipe; when the elastic claw part is limited in the first limiting groove, the first end of the switch sliding sleeve is limited in the third limiting groove.

Furthermore, the first sealing structure, the second sealing structure and the third sealing structure respectively comprise a sealing groove formed in the switch sliding sleeve and a sealing ring installed in the sealing groove.

Further, the sealing assembly comprises an upper rubber cylinder and a lower rubber cylinder; the setting assembly further comprises an upper piston, a lower piston, a hydraulic cylinder and a lower support sleeve; the upper rubber cylinder, the upper piston, the lower rubber cylinder and the lower support sleeve are sequentially sleeved on the central tube from top to bottom, and the lower connecting tube is fixed relative to the central tube; the upper rubber collet is arranged between the lower connecting pipe and the upper piston; the hydraulic cylinder is sleeved on the outer peripheral sides of the upper piston and the lower piston, a first end of the hydraulic cylinder is fixedly connected with the upper piston, and a second end of the hydraulic cylinder is in sliding connection with the lower piston; a gap is reserved between the upper piston and the lower piston, and the central pipe, the upper piston, the lower piston and the hydraulic cylinder enclose the first sealed space; the pressure in the first sealing space is gradually increased, so that the upper piston and the lower piston move back to extrude the upper rubber cylinder and the lower rubber cylinder respectively.

Further, the setting assembly further comprises a locking ring and a pressing ring; the locking ring is fixedly connected to the second end of the hydraulic cylinder and is in threaded connection with the lower piston through one-way sawtooth threads; the compression ring is fixedly connected with the lower piston, the first end of the compression ring is clamped between the hydraulic cylinder and the lower piston, and the second end of the compression ring is clamped between the lower piston and the lower rubber sleeve.

Further, the bypass packer further comprises a lower short section; the lower short section is connected to the inside of the lower support sleeve in a sealing mode, a third annular space is formed between the lower short section and the central insertion tube, and the third annular space is communicated with the second annular space.

Further, the switch tool comprises a main body pipe, a bidirectional claw and an elastic piece; a limiting space is arranged on the main body pipe; the bidirectional clamping jaw is provided with an upper boss and a lower boss, the bidirectional clamping jaw is limited in the limiting space, and the upper boss and the lower boss protrude out of the outer peripheral side of the main pipe; the elastic piece is connected between the bottom surface of the limiting space and the bidirectional clamping jaw; the upper boss and the lower boss are used for being matched with a first concave station and a second concave station on the switch sliding sleeve respectively so as to drive the switch sliding sleeve to move along the axial direction of the connecting pipe.

Furthermore, the switch tool also comprises a lower connector, the lower connector is sequentially provided with an accommodating cavity and a third concave platform along the axial direction of the lower connector, and the diameter of the accommodating cavity is smaller than that of the third concave platform; one end of the main body pipe is inserted into the accommodating cavity, and an annular gap is formed between the main body pipe and the lower connector at the third concave platform; a shearing ring is arranged at the annular gap and sleeved on the main body pipe, a shearing pin is connected between the shearing ring and the main body pipe, and an axial gap is formed between the shearing ring and the bottom surface of the third concave platform; the surfaces of the lower boss and the third concave station, which are in contact with each other, are inclined planes, and when the shearing ring moves along the axial gap under the action of external force, the third concave station is used for driving the lower boss to compress the elastic piece.

Has the advantages that:

according to the bypass packer provided by the invention, the sealing component in the setting component can be tightly abutted against the well wall under the liquid pressure to realize setting, and the oil-gas well can be layered after the bypass packer is set; when gravel packing is carried out, the bypass channel is in an open state, and the sand-carrying fluid can enter the lower layer through the bypass channel, the first annular space and the second annular space to realize lower layer packing; after the lower layer filling is finished, the upper layer filling can be continuously carried out without other operations; after gravel packing is finished, the bypass channel can be closed by moving the descending switch tool, and the upper layer and the lower layer are isolated. According to the packer, the two or more layers of gravel can be filled by matching the bypass packer with the switch tool, the operation steps are simple, and the efficiency is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a bypass packer provided by an embodiment of the present invention;

FIG. 2 is one of the partial cross-sectional views of the bypass packer of FIG. 1;

FIG. 3 is a second partial cross-sectional view of the bypass packer of FIG. 1;

FIG. 4 is one of the cross-sectional views of the bypass connector rod;

FIG. 5 is a second cross-sectional view of the bypass connector link;

FIG. 6 is a third partial cross-sectional view of the bypass packer of FIG. 1, with the bypass passage in an open position;

FIG. 7 is a fourth partial cross-sectional view of the bypass packer of FIG. 1, with the bypass passage in a closed position;

FIG. 8 is an enlarged partial view of FIG. 3 at A;

FIG. 9 is an enlarged view of a portion of FIG. 3 at B;

fig. 10 is a cross-sectional view of the switch tool.

Icon:

10-a first annular space; 20-a second annular space; 30-a first sealed space; 40-a third annular space; 50-axial clearance;

100-a central tube;

200-a bypass connecting rod; 210-pressure transfer holes; 220-a first double-walled channel;

300-upper cannula;

400-a central cannula;

511-upper connecting tube; 5111-a second double-walled channel; 5112-a third limiting groove; 512-middle connecting pipe; 513-lower connecting tube; 5131-a third chuckwall channel; 5132-a first limit groove; 5133-a second limiting groove; 520-opening and closing the sliding sleeve; 521-a seal groove; 522-a first recessed land; 523-second concave stage; 530-locking claw; 531-elastic claw portion;

610-gluing a rubber cylinder; 620-lower rubber cylinder; 630-an upper piston; 640-a lower piston; 650-hydraulic cylinder; 660-lower support sleeve; 670-a locking ring; 680-pressing ring;

700-lower short section;

810-a main body tube; 820-bidirectional jaws; 821-upper boss; 822-lower boss; 830-an elastic member; 840-lower connector; 850-shear ring; 860-shear pins.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The present embodiment provides a bypass packer, as shown in fig. 1-5, comprising a base pipe 100, a bypass connector rod 200, an upper insert tube 300, a center insert tube 400, a bypass channel assembly, and a setting assembly; the bypass connecting rod 200 is hermetically connected in the central tube 100, and the bypass connecting rod 200 is provided with a pressure transfer hole 210 and a first double-wall channel 220 which are not communicated with each other; the upper end of the bypass connecting rod 200 is fixedly connected with the upper insertion tube 300, and a first annular space 10 is formed between the upper insertion tube 300 and the central tube 100; the lower end of the bypass connecting rod 200 is fixedly connected with the central insertion tube 400, and a second annular space 20 is formed between the central insertion tube 400 and the central tube 100; the first annular space 10 and the second annular space 20 are both in communication with the first chuckwall passage 220; a bypass passage assembly, each connected to the upper ends of the base pipe 100 and the upper insert pipe 300, having a bypass passage opened or closed by a switching means, the bypass passage being capable of communicating with the first annular space 10 in an opened state for downward conveyance of gravel; the setting assembly comprises a first sealed space 30 and a sealing assembly, the first sealed space 30 is communicated with a pressure transfer hole 210 and used for enabling liquid pressure to enter the first sealed space 30 through the pressure transfer hole 210, the sealing assembly is sleeved on the central pipe 100 and used for tightly abutting against a well wall when the liquid pressure of the first sealed space 30 reaches a set value.

According to the bypass packer provided by the embodiment, the sealing assembly in the setting assembly can be tightly abutted against the well wall under the liquid pressure to realize setting, and the oil-gas well can be layered after the bypass packer is set; when gravel packing is carried out, the bypass channel is in an open state, and the sand-carrying fluid can enter the lower layer through the bypass channel, the first annular space 10 and the second annular space 20 to realize lower layer packing; after the lower layer filling is finished, the upper layer filling can be continuously carried out without other operations; after gravel packing is finished, the bypass channel can be closed by moving the descending switch tool, and the upper layer and the lower layer are isolated. According to the packer, the two or more layers of gravel can be filled by matching the bypass packer with the switch tool, the operation steps are simple, and the efficiency is high.

In the present embodiment, referring to fig. 1, 4 and 5, the bypass connecting rod 200 has a substantially H-shaped longitudinal cross-sectional shape; illustratively, the pressure transfer holes 210 and the first double-walled channels 220 are arranged in three, and the two pressure transfer holes are arranged alternately in a circle, that is, one first double-walled channel 220 is arranged between two adjacent pressure transfer holes 210, or one pressure transfer hole 210 is arranged between two adjacent first double-walled channels 220. The pressure transfer holes 210 are radially arranged, the first double-walled channel 220 is axially arranged, and the first double-walled channel 220 is arc-shaped.

Specifically, as shown in fig. 2, 6 and 7, the bypass channel assembly includes a connecting pipe and a switch sliding sleeve 520 disposed in the connecting pipe, the connecting pipe includes an upper connecting pipe 511, a middle connecting pipe 512 and a lower connecting pipe 513, which are fixedly connected in sequence from top to bottom, and the lower end of the lower connecting pipe 513 is fixedly connected to the central pipe 100; the upper connection pipe 511 has a second double-walled passage 5111, and the lower connection pipe 513 has a third double-walled passage 5131; a first end (namely, an upper end) of the switch sliding sleeve 520 is hermetically connected with the upper connecting pipe 511 through a first sealing structure, a second end (namely, a lower end) of the switch sliding sleeve 520 is hermetically connected with the lower connecting pipe 513 through a second sealing structure, a middle space is formed between the switch sliding sleeve 520 and the middle connecting pipe 512, and a bypass channel is formed by the second double-wall channel 5111, the third double-wall channel 5131 and the middle space; the switching sleeve 520 can move along the axial direction of the connection pipe to open or close the bypass passage.

Briefly, referring to fig. 2, the bypass passage is opened by the downward movement of the switching sleeve 520 along the axial direction of the connection pipe, and the bypass passage is closed by the upward movement of the switching sleeve 520 along the axial direction of the connection pipe.

Referring to fig. 2, fig. 6 and fig. 7, the lower end of the switch sliding sleeve 520 is provided with a locking claw 530, and the locking claw 530 includes an elastic claw portion 531; the lower connecting pipe 513 is provided with a first limiting groove 5132 and a second limiting groove 5133 which are matched with the elastic claw portions 531, and the first limiting groove 5132 and the second limiting groove 5133 are arranged at intervals along the axial direction of the lower connecting pipe 513; when the elastic claw 531 is limited in the first limit groove 5132, the switch sliding sleeve 520 is connected with the middle connecting pipe 512 in a sealing way through a third sealing structure, so that the middle space is divided into two parts which are not communicated; when the elastic claw portion 531 is caught by the second catching groove 5133, the second chuckwall path 5111 communicates with the third chuckwall path 5131 through the middle space.

As shown in fig. 6 and 7, a third limiting groove 5112 is further disposed in the upper connecting pipe 511, and the third limiting groove 5112 is recessed inwards along the radial direction of the upper connecting pipe 511; when the elastic claw 531 is stopped at the first stopper groove 5132, the first end of the switch sliding sleeve 520 is stopped at the third stopper groove 5112.

Specifically, when the switch sliding sleeve 520 moves downwards along the axial direction of the connecting pipe, the elastic claw part 531 of the locking claw 530 moves to the second limit groove 5133, at this time, the lower end of the locking claw 530 abuts against the upper end of the upper insertion pipe 300, the existence of the upper insertion pipe 300 will limit the locking claw 530 to continue moving downwards, that is, after the elastic claw part 531 of the locking claw 530 moves downwards to a certain position, the switch sliding sleeve 520 cannot continue moving downwards, and at this time, the bypass passage is opened; similarly, when the elastic claw 531 of the locking claw 530 moves to the first limit groove 5132 in the upward movement of the switching sliding sleeve 520 along the axial direction of the connecting pipe, the upper end of the switching sliding sleeve 520 is limited by the third limit groove 5112, which limits the upward movement of the switching sliding sleeve 520, that is, when the elastic claw 531 of the locking claw 530 moves upward to a certain position, the switching sliding sleeve 520 cannot move upward, and at this time, the bypass passage is closed.

In this embodiment, as shown in fig. 2, each of the first sealing structure, the second sealing structure and the third sealing structure includes a sealing groove 521 opened on the switch sliding sleeve 520 and a sealing ring (not shown in the drawings) installed in the sealing groove 521.

The first sealing structure, the third sealing structure and the second sealing structure are sequentially arranged at intervals from top to bottom, in brief, referring to fig. 2, the first sealing structure is located at the upper end of the switch sliding sleeve 520, the second sealing structure is located at the lower end of the switch sliding sleeve 520, and the third sealing structure is located between the first sealing structure and the second sealing structure and is close to the second sealing structure.

In this embodiment, with reference to fig. 2, 3, 8 and 9, the sealing assembly includes an upper rubber cylinder 610 and a lower rubber cylinder 620; the setting assembly further comprises an upper piston 630, a lower piston 640, a hydraulic cylinder 650 and a lower support sleeve 660; the upper rubber cylinder 610, the upper piston 630, the lower piston 640, the lower rubber cylinder 620 and the lower support sleeve 660 are sequentially sleeved on the central tube 100 from top to bottom, and the lower connecting tube 513 is fixed relative to the central tube 100; the upper rubber cylinder 610 is clamped between the lower connecting pipe 513 and the upper piston 630; the hydraulic cylinder 650 is sleeved on the outer peripheral sides of the upper piston 630 and the lower piston 640, a first end of the hydraulic cylinder 650 is fixedly connected with the upper piston 630, and a second end of the hydraulic cylinder 650 is slidably connected with the lower piston 640; a gap is reserved between the upper piston 630 and the lower piston 640, and the central pipe 100, the upper piston 630, the lower piston 640 and the hydraulic cylinder 650 enclose a first sealed space 30; the pressure in the first sealed space 30 is gradually increased to move the upper piston 630 and the lower piston 640 away from each other, so as to press the upper rubber cylinder 610 and the lower rubber cylinder 620 respectively.

It should be noted that, in the actual setting process, a washpipe (not shown in the drawings) and a setting pipe (not shown in the drawings) need to be lowered into the pipe of the bypass packer, when a liquid pressure is introduced into the pipe, the liquid pressure can enter the pressure transfer hole 210 of the bypass connecting rod 200 through the washpipe, so as to enter the first sealed space 30, and as the pressure in the first sealed space 30 gradually increases, the upper piston 630 and the lower piston 640 are pushed to move away from each other, the upper piston 630 drives the hydraulic cylinder 650 to move upwards and extrude the upper rubber cylinder 610, so that the upper rubber cylinder 610 expands outwards in the radial direction to abut against the well wall; at the same time, the lower piston 640 will press down on the lower rubber cylinder 620, so that the lower rubber cylinder 620 will expand radially outward against the well wall, thereby achieving setting. Further, as shown in fig. 9, the setting assembly further comprises a lock ring 670 and a press ring 680; lock ring 670 is fixedly connected to the second end of hydraulic cylinder 650, and lock ring 670 is threadedly connected to lower piston 640 by one-way saw-tooth threads; pressing ring 680 is fixedly connected to lower piston 640, and a first end of pressing ring 680 is clamped between hydraulic cylinder 650 and lower piston 640, and a second end of pressing ring 680 is clamped between lower piston 640 and lower glue cylinder 620.

Specifically, lock ring 670 has one-way serrated threads that mate with lower piston 640, and when set, lower piston 640 may move downward relative to lock ring 670, but cannot return upward, to lock the seated position of lower piston 640.

During the downward movement of the lower piston 640, the lower piston 640 pushes the pressing ring 680 to move, so that the pressing ring 680 presses the lower glue cylinder 620.

With reference to fig. 1-3, the bypass packer further comprises a lower sub 700; the lower short section 700 is connected inside the lower support sleeve 660 in a sealing manner, a third annular space 40 is formed between the lower short section 700 and the central insertion tube 400, and the third annular space 40 is communicated with the second annular space 20; wherein, the lower short joint 700 can be connected with a bypass screen pipe; in addition, the upper connection pipe 511 has a sealing step, and can be connected with a bypass screen pipe by matching with the upper joint.

It should be noted that the bypass packer is mainly involved in the setting stage, the filling stage and the bypass passage closing stage during the use process. In the setting phase and the filling phase, the bypass channel is in an open state, and when filling is completed, the bypass channel needs to be closed by means of a switching tool.

It should also be noted that the above-mentioned "fixed connection" may be a threaded connection to facilitate the assembly and disassembly of the components.

The specific construction of the bypass packer has been described above, followed by the specific construction of the switch tool.

Referring to fig. 6, 7 and 10, the switch tool is used for driving the switch sliding sleeve 520 to move along the axial direction of the connecting pipe, and comprises a main body pipe 810, a bidirectional jaw 820 and an elastic member 830; a limiting space is arranged on the main tube 810; the bidirectional jaw 820 is provided with an upper boss 821 and a lower boss 822, the bidirectional jaw 820 is limited in a limiting space, and the upper boss 821 and the lower boss 822 protrude out of the outer periphery side of the main tube 810; the elastic member 830 is connected between the bottom surface of the limiting space and the bidirectional jaw 820; the upper projection 821 and the lower projection 822 are used for respectively matching with the first recess 522 and the second recess 523 on the switch sliding sleeve 520 so as to drive the switch sliding sleeve 520 to move along the axial direction of the connecting pipe.

Specifically, as shown in fig. 6, first recessed land 522 is located below second recessed land 523.

Alternatively, the elastic member 830 may be a spring.

Referring to fig. 7 and 10, when the bypass channel is opened, the switch tool can be fed into the bypass packer by means of the washpipe, and at this time, the upper boss 821 on the bidirectional claw 820 is matched with the first boss 522 of the switch sliding sleeve 520, so that the switch tool drives the switch sliding sleeve 520 to move downwards until the state shown in fig. 6 is reached, and the bypass channel is opened.

Referring to fig. 6 and 10, when the bypass channel is closed, the switch tool can be fed into the bypass packer by means of the washpipe, and at this time, the lower boss 822 on the bidirectional claw 820 is matched with the second boss 523 of the switch sliding sleeve 520, so that the switch tool drives the switch sliding sleeve 520 to move upwards until the state shown in fig. 7 is reached, and the bypass channel is closed.

Further, with reference to fig. 10, the switch tool further includes a lower connector 840, the lower connector 840 is sequentially provided with an accommodating cavity and a third concave platform along an axial direction thereof, and a diameter of the accommodating cavity is smaller than a diameter of the third concave platform; one end of the main tube 810 is inserted into the accommodating cavity, and an annular gap is formed between the main tube and the lower connector 840 at the third concave station; a shear ring 850 is arranged at the annular gap, the shear ring 850 is sleeved on the main body pipe 810, a shear pin 860 is connected between the shear ring 850 and the main body pipe 810, and an axial gap 50 is formed between the shear ring 850 and the bottom surface of the third concave station; the contact surfaces of the lower boss 822 and the third boss are inclined surfaces, and when the shear ring 850 moves along the axial gap 50 under the action of an external force, the third boss is used for driving the lower boss 822 to compress the elastic member 830, so that the two-way pawl 820 retracts toward the direction close to the main tube 810, and the switch tool can move out of the switch sliding sleeve 520. If the bi-directional jaw 820 becomes stuck and cannot be lifted out, it can lift upward, shearing off the shear pin 860, and due to the axial gap 50, the shear ring 850 will move slightly downward, providing room for the bi-directional jaw 820 to move so that the lower connector 840 compresses the bi-directional jaw 820 so that the switch tool can be lifted out upward.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bypass packer, comprising: a central tube (100), a bypass connecting rod (200), an upper cannula (300), a central cannula (400), a bypass channel assembly and a setting assembly;

the bypass connecting rod (200) is connected in the central pipe (100) in a sealing manner, and a pressure transfer hole (210) and a first wall clamping channel (220) which are not communicated with each other are arranged on the bypass connecting rod (200);

the upper end of the bypass connecting rod (200) is fixedly connected with the upper insertion pipe (300), and a first annular space (10) is formed between the upper insertion pipe (300) and the central pipe (100); the lower end of the bypass connecting rod (200) is fixedly connected with the central insertion pipe (400), and a second annular space (20) is formed between the central insertion pipe (400) and the central pipe (100); the first annular space (10) and the second annular space (20) both communicating with the first double-walled channel (220);

the bypass channel assembly is connected with the upper ends of the central pipe (100) and the upper insertion pipe (300), and is provided with a bypass channel which can be opened or closed through a switch tool and can be communicated with the first annular space (10) in an opening state for conveying gravel downwards;

the setting assembly comprises a first sealing space (30) and a sealing assembly, wherein the first sealing space (30) is communicated with the pressure transfer hole (210) and is used for enabling liquid pressure to enter the first sealing space (30) through the pressure transfer hole (210), the sealing assembly is sleeved on the central pipe (100), and the sealing assembly is tightly abutted against the wall of the well when the liquid pressure of the first sealing space (30) reaches a set value.

2. The bypass packer according to claim 1, wherein the bypass channel assembly comprises a connecting pipe and a switch sliding sleeve (520) arranged in the connecting pipe, the connecting pipe comprises an upper connecting pipe (511), a middle connecting pipe (512) and a lower connecting pipe (513) which are fixedly connected from top to bottom, and the lower end of the lower connecting pipe (513) is fixedly connected with the central pipe (100);

the upper connection pipe (511) has a second double-walled channel (5111), and the lower connection pipe (513) has a third double-walled channel (5131); a first end of the switch sliding sleeve (520) is connected with the upper connecting pipe (511) in a sealing mode through a first sealing structure, a second end of the switch sliding sleeve (520) is connected with the lower connecting pipe (513) in a sealing mode through a second sealing structure, a middle space is formed between the switch sliding sleeve (520) and the middle connecting pipe (512), and the second double-wall channel (5111), the third double-wall channel (5131) and the middle space form the bypass channel; the switch sliding sleeve (520) can move along the axial direction of the connecting pipe to open or close the bypass channel.

3. The bypass packer according to claim 2, characterized in that the lower end of the switch sliding sleeve (520) is provided with a locking claw (530), and the locking claw (530) comprises an elastic claw part (531);

a first limiting groove (5132) and a second limiting groove (5133) which are matched with the elastic claw parts (531) are formed in the lower connecting pipe (513), and the first limiting groove (5132) and the second limiting groove (5133) are arranged at intervals along the axial direction of the lower connecting pipe (513); when the elastic claw part (531) is limited in the first limiting groove (5132), the switch sliding sleeve (520) is connected with the middle connecting pipe (512) in a sealing way through a third sealing structure, and the middle space is divided into two parts which are not communicated;

when the elastic claw (531) is stopped at the second stopper groove (5133), the second chuck wall passage (5111) communicates with the third chuck wall passage (5131) through the middle space.

4. The bypass packer according to claim 3, characterized in that a third limit groove (5112) is further arranged in the upper connecting pipe (511), and the third limit groove (5112) is recessed inwards along the radial direction of the upper connecting pipe (511);

when the elastic claw part (531) is limited in the first limit groove (5132), the first end of the switch sliding sleeve (520) is limited in the third limit groove (5112).

5. The bypass packer according to claim 3, wherein the first, second and third sealing structures each comprise a sealing groove (521) opened on the switch sliding sleeve (520) and a sealing ring installed in the sealing groove (521).

6. The bypass packer according to any one of claims 2-5, wherein the seal assembly comprises an upper packing element (610) and a lower packing element (620); the setting assembly further comprises an upper piston (630), a lower piston (640), a hydraulic cylinder (650) and a lower support sleeve (660); the upper rubber cylinder (610), the upper piston (630), the lower piston (640), the lower rubber cylinder (620) and the lower support sleeve (660) are sequentially sleeved on the central pipe (100) from top to bottom, and the lower connecting pipe (513) is fixed relative to the central pipe (100); the upper rubber cylinder (610) is clamped between the lower connecting pipe (513) and the upper piston (630);

the hydraulic cylinder (650) is sleeved on the outer peripheral sides of the upper piston (630) and the lower piston (640), a first end of the hydraulic cylinder (650) is fixedly connected with the upper piston (630), and a second end of the hydraulic cylinder (650) is in sliding connection with the lower piston (640); a gap is reserved between the upper piston (630) and the lower piston (640), and the central pipe (100), the upper piston (630), the lower piston (640) and the hydraulic cylinder (650) enclose the first sealed space (30);

the pressure in the first sealed space (30) is gradually increased, so that the upper piston (630) and the lower piston (640) can move oppositely to respectively extrude the upper rubber cylinder (610) and the lower rubber cylinder (620).

7. The bypass packer of claim 6, wherein the setting assembly further comprises a lock ring (670) and a pressure ring (680);

the locking ring (670) is fixedly connected to the second end of the hydraulic cylinder (650), and the locking ring (670) is in threaded connection with the lower piston (640) through one-way sawtooth threads;

clamping ring (680) fixed connection in lower piston (640), just the first end of clamping ring (680) is located pneumatic cylinder (650) with between lower piston (640), the second end clamp of clamping ring (680) is located lower piston (640) with between lower packing element (620).

8. The bypass packer of claim 6, further comprising a lower sub (700);

the lower short section (700) is connected to the inside of the lower support sleeve (660) in a sealing mode, a third annular space (40) is formed between the lower short section (700) and the central insertion pipe (400), and the third annular space (40) is communicated with the second annular space (20).

9. The bypass packer of claim 2, wherein the switch tool comprises a main tube (810), a bi-directional jaw (820), and a resilient member (830);

a limiting space is arranged on the main body pipe (810); an upper boss (821) and a lower boss (822) are arranged on the bidirectional clamping jaw (820), the bidirectional clamping jaw (820) is limited in the limiting space, and the upper boss (821) and the lower boss (822) protrude out of the outer periphery side of the main pipe (810); the elastic piece (830) is connected between the bottom surface of the limiting space and the bidirectional claw (820);

the upper boss (821) and the lower boss (822) are used for being matched with a first concave platform (522) and a second concave platform (523) on the switch sliding sleeve (520) respectively so as to drive the switch sliding sleeve (520) to move along the axial direction of the connecting pipe.

10. The bypass packer according to claim 9, wherein the switch tool further comprises a lower connector (840), the lower connector (840) is provided with a receiving cavity and a third concave platform along the axial direction thereof in sequence, and the diameter of the receiving cavity is smaller than that of the third concave platform;

one end of the main body pipe (810) is inserted into the accommodating cavity, and an annular gap is formed between the main body pipe and the lower connector (840) at the third concave platform; a shear ring (850) is arranged at the annular gap, the shear ring (850) is sleeved on the main body pipe (810), a shear pin (860) is connected between the shear ring (850) and the main body pipe and the shear pin, and an axial gap (50) is formed between the shear ring (850) and the bottom surface of the third concave platform;

the lower boss (822) and the surface of the third boss, which is in contact with each other, are inclined planes, and when the shear ring (850) moves along the axial gap (50) under the action of external force, the third boss is used for driving the lower boss (822) to compress the elastic piece (830).