CN113294119A - Packer and well completion structure - Google Patents

Abstract

The invention provides a packer and a well completion structure, wherein the packer comprises: the device comprises a pipe body, a rubber cylinder and an electric control valve; the rubber cylinder is sleeved outside the pipe body; the tube body is provided with a piston cavity; the electric control valve is arranged on the tube body, is respectively communicated with the piston cavity and the tube cavity of the tube body and is used for controlling the connection and disconnection between the piston cavity and the tube cavity of the tube body; an isolation piston is arranged in the piston cavity, pressure liquid in the tube cavity of the tube body can enter the piston cavity through an electric control valve to push the isolation piston to move, and the isolation piston drives the outer diameter of the rubber cylinder to expand outwards. The packer has a large inner drift diameter, is convenient for a plurality of matching uses, has a simpler control structure, and improves the reliability of control.

Description

Packer and well completion structure

Technical Field

The invention relates to a downhole flow control tool, in particular to a packer and a well completion structure.

Background

The packer is an important tool for oil and gas field exploitation, and mainly has the functions of isolating stratum and carrying out layering operation technology so as to realize oil field production increase. Compared with the conventional packer, the electric control packer can realize the control of setting and unsetting of the packer from the ground in an electric control mode, can be repeatedly used, and has great advantages in the aspects of oil well trial production, separate layer production, intelligent well completion technology and the like.

Patent CN201510607804.2 describes an electric packer, in which a setting mode adopts a microcontroller to control an execution motor to rotate, so that hydraulic oil pushes a setting piston to extrude a packer rubber cylinder to realize setting; the deblocking also adopts the mode of controlling the reverse rotation of the actuating motor, so that the hydraulic oil flows reversely, and the setting piston resets under the action of negative pressure and rubber cylinder deformation force, thereby realizing the deblocking. Although this patent has realized the function of electric control setting and deblocking, but control structure is very complicated, and electronic component is many in the pit, and the latus rectum is narrow and small in the packer, can only use singly.

Patent CN201610249172.1 describes an electric packer, in which the setting mode adopts a mode that a motor drives a hydraulic pump, and hydraulic oil in an oil bag is pumped into a gap inside an expandable rubber cylinder to seal the expandable rubber cylinder; when deblocking, the motor drives the deblocking mechanism to release the pressure of the hydraulic oil in the rubber cylinder, so as to realize deblocking. This patent adopts the electro-hydraulic pressure energy as power, uses hydraulic oil and well fluid isolation with the system, but control structure is very complicated, and electronic component is many in the pit, and the latus rectum is narrow and small in the packer, can only use singly.

Patent CN201210496729.3 has introduced an automatically controlled compression packer, and it adopts annular hollow motor to drive annular reduction gears, and the promotion lead screw carries out just reversing motion in order to compress and release the packing element, realizes setting and deblocking. The packer can be connected with a plurality of underground packers through one cable, the inner drift diameter of the packer is large, and the cable can penetrate through the packer; however, the control accuracy and the operation stability are poor, and forced deblocking cannot be performed.

Disclosure of Invention

The invention aims to provide a packer and a well completion structure, wherein the packer has a larger inner drift diameter, is convenient for a plurality of packers to be matched for use, has a simpler control structure and improves the reliability of control.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a packer, comprising: the device comprises a pipe body, a rubber cylinder and an electric control valve; the rubber sleeve is sleeved outside the pipe body; the tube body is provided with a piston cavity; the electric control valve is arranged on the tube body, is respectively communicated with the piston cavity and the tube cavity of the tube body and is used for controlling the connection and disconnection between the piston cavity and the tube cavity of the tube body; an isolation piston is arranged in the piston cavity, pressure liquid in the tube cavity of the tube body can enter the piston cavity through the electric control valve to push the isolation piston to move, and the isolation piston drives the outer diameter of the rubber cylinder to expand outwards.

In a preferred embodiment, an expansion cavity is arranged between the inner wall of the rubber cylinder and the outer wall of the pipe body; in the piston cavity, a first side of the isolation piston is communicated with the electric control valve, and a second side of the isolation piston is communicated with the expansion cavity.

In a preferred embodiment, the second side of the isolating piston is filled with hydraulic oil.

In a preferred embodiment, a first rubber sleeve joint is fixedly connected to one end of the rubber sleeve close to the piston cavity, and the first rubber sleeve joint is connected to the pipe body.

In a preferred embodiment, the first rubber cartridge joint is sleeved outside the pipe body.

In a preferred embodiment, an annular cavity is arranged between the inner wall of the first rubber cylinder joint and the outer wall of the pipe body, the annular cavity is located between the expansion cavity and the rubber cylinder, the annular cavity is communicated with the expansion cavity, and the annular cavity is communicated with the second side of the isolation piston in the piston cavity.

In a preferred embodiment, one end of the rubber cylinder, which is far away from the piston cavity, is connected with a second rubber cylinder joint, and the second rubber cylinder joint is fixedly connected to the pipe body.

In a preferred embodiment, the second cartridge joint is connected to the pipe body by a first shear screw.

In a preferred embodiment, the packer comprises slips, a slip bowl, a first connecting body and a second connecting body, the slip bowl is sleeved outside the pipe body, the slips are mounted on the slip bowl, and the slips can move in a radial direction relative to the slip bowl; the first connecting body is abutted against one end of the slip, and the second connecting body is abutted against the other end of the slip; the first connecting body and the slips are respectively provided with conical surfaces for abutting and matching, and/or the second connecting body and the slips are respectively provided with conical surfaces for abutting and matching; when pressure liquid in the pipe cavity of the pipe body enters the piston cavity through the electric control valve, the first connecting body can be pushed to move along the axial direction of the pipe body, and the slips are pushed by the first connecting body to move outwards along the radial direction.

In a preferred embodiment, the second connecting body is fixedly connected to the pipe body by a second shear screw.

In a preferred embodiment, a hydraulic cylinder communicated with the piston cavity is arranged outside the pipe body, a slip piston is arranged in the hydraulic cylinder, and the first connecting body is connected with the slip piston; when pressure liquid in the pipe cavity of the pipe body enters the piston cavity through the electric control valve, the slip piston is driven to move along the axial direction of the pipe body.

In a preferred embodiment, an expansion cavity is arranged between the inner wall of the rubber cylinder and the outer wall of the pipe body; in the piston cavity, a first side of the isolating piston is communicated with the electric control valve, and a second side of the isolating piston is communicated with the expansion cavity; the hydraulic cylinder is fixedly connected to one end, far away from the piston cavity, of the rubber cylinder and is communicated with the piston cavity through the expansion cavity.

In a preferred embodiment, the piston cavity, the rubber cylinder, the hydraulic cylinder and the slip bowl are sequentially arranged from top to bottom.

In a preferred embodiment, a slip spring for driving the slips to move inwards in a radial direction is arranged between the slip seat and the slips, and/or a return spring connected with the slip piston is arranged in the hydraulic cylinder.

In a preferred embodiment, the side wall of the tube body is provided with an axial through hole for passing a cable.

In a preferred embodiment, the electrically controlled valve is a normally closed valve.

The present invention provides a well completion structure comprising:

an oil pipe;

at least one of the above-described packers disposed along the tubing;

and the two sides of the packer are respectively provided with the production allocation device.

The invention has the characteristics and advantages that:

the packer is connected to an oil pipe, and after the packer is lowered to a specified position of an oil well along with the oil pipe, an instruction is sent to the electric control valve, so that the electric control valve is in an open state, and the piston cavity is communicated with the pipe cavity of the pipe body; the oil pipe is pressurized through the ground pump truck, the pressure in the pipe cavity of the pipe body is increased, pressure liquid in the pipe cavity of the pipe body enters the piston cavity, the isolation piston is pushed to move, the outer diameter of the rubber cylinder is driven to expand outwards, the outer wall of the rubber cylinder is in sealing contact with the inner wall of the sleeve, and layering of the oil well is achieved. After the pressure liquid entering the piston cavity reaches a designated value, the electric control valve is controlled to be closed, the piston cavity is disconnected from the tube cavity of the tube body, and the pressure liquid in the piston cavity is sealed, so that the rubber tube is kept expanded and spread, and the setting state is maintained.

The packer utilizes pressure liquid in an oil pipe to provide driving force for realizing setting, and realizes the control of setting through an electric control valve, thereby saving power elements such as a motor and the like arranged in a packer body, simplifying the structure of the packer, being beneficial to reducing the space occupied by mechanical parts, being convenient for realizing larger inner drift diameter and being used in an oil well in a plurality of matching ways; the reliability of control is improved. The voltage of a cable connected with the ground in the packer is smaller, so that the wire diameter of the cable is smaller.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a packer provided by the present invention in an unset state;

FIG. 2 is a schematic structural view of the packer shown in FIG. 1 in a set state;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

fig. 5 is a schematic structural diagram of a well completion structure provided by the present invention.

The reference numbers illustrate:

1. a packer; 2. an oil pipe; 3. a production allocator;

10. a pipe body; 101. the axial direction of the pipe body; 11. a lumen of the tube body; 12. connecting holes; 13. an axial through hole;

20. a piston cavity; 21. an isolation piston; 211. isolating a first side of the piston; 212. a second side of the isolation piston;

30. a rubber cylinder; 301. a first glue cartridge joint; 302. a second glue cartridge joint; 31. an expansion lumen; 32. an annular cavity; 33. a first shear screw;

40. an electrically controlled valve; 41. a cable;

51. slips; 52. a slip seat; 53. a slip spring;

61. a first connecting body; 62. a second connector; 63. a conical surface; 64. a second shear screw;

71. a hydraulic cylinder; 72. a slip piston; 73. a return spring.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Example one

The present invention provides a packer, as shown in fig. 1, which includes: the tube body 10, the rubber cylinder 30 and the electric control valve 40; the rubber cylinder 30 is sleeved outside the pipe body 10; the tube body 10 is provided with a piston cavity 20; the electric control valve 40 is arranged on the tube body 10, and the electric control valve 40 is respectively communicated with the piston cavity 20 and the tube cavity 11 of the tube body and is used for controlling the connection and disconnection between the piston cavity 20 and the tube cavity 11 of the tube body; an isolation piston 21 is arranged in the piston cavity 20, pressure liquid in the pipe cavity 11 of the pipe body can enter the piston cavity 20 through an electric control valve 40 to push the isolation piston 21 to move, and the isolation piston 21 drives the outer diameter of the rubber cylinder 30 to expand outwards. The electric control valve 40 can be a normally open valve or a normally closed valve. Preferably, the electrically controlled valve is a normally closed valve so as to remain open when de-energized, maintaining the pressure in the piston chamber 20; specifically, the electronic control valve 40 is a normally closed type electromagnetic valve. The piston cavity 20 can be drilled and formed on the side wall of the tube body 10; as shown in fig. 3, a connecting hole 12 is drilled in the sidewall of the tubular body 10, and the electrically controlled valve 40 communicates with the lumen 11 of the tubular body through the connecting hole 12.

The upper end and the lower end of a pipe body 10 in the packer are respectively connected with an oil pipe through an oil pipe buckle, and the packer sends an instruction to an electric control valve 40 after being lowered to a specified position of an oil well along with the oil pipe, so that the electric control valve 40 is in an open state, and a piston cavity 20 is communicated with a pipe cavity 11 of the pipe body; the oil pipe is pressurized through the ground pump truck, the pressure in the pipe cavity 11 of the pipe body is increased, the pressure liquid in the pipe cavity 11 of the pipe body enters the piston cavity 20 to push the isolation piston 21 to move, the outer diameter of the rubber cylinder 30 is driven to expand outwards, the outer wall of the rubber cylinder 30 is in sealing contact with the inner wall of the sleeve, and oil well layering is achieved. After the pressure liquid entering the piston cavity reaches a designated value, the electronic control valve 40 is controlled to be closed, the piston cavity 20 is disconnected from the tube cavity 11 of the tube body, and the pressure liquid in the piston cavity 20 is sealed, so that the rubber cylinder 30 is kept to be spread and the setting state is maintained.

The packer utilizes pressure liquid in an oil pipe to provide driving force for realizing setting, and the setting is controlled through the electric control valve 40, so that power elements such as a motor and the like are omitted from being arranged in a body of the packer, the structure of the packer is simplified, the space occupied by mechanical parts is favorably reduced, a larger inner drift diameter is convenient to realize, and a plurality of the packer can be used in an oil well in a matched manner; the reliability of control is improved. The voltage of a cable connected with the ground in the packer is smaller, so that the wire diameter of the cable is smaller.

There are many ways to drive the outer diameter of the rubber cartridge 30 to expand outward by the movement of the isolation piston 21, for example: the isolation piston 21 directly applies thrust to the rubber cylinder 30 to drive the rubber cylinder 30 to expand; alternatively, the rubber sleeve 30 is indirectly driven to expand by the flowing medium when the isolation piston 21 moves.

In one embodiment, one end of the rubber cylinder 30 is fixed outside the tube 10, the other end of the rubber cylinder 30 can move along the tube 10, the isolation piston 21 is connected with the movable end of the rubber cylinder 30, and the isolation piston 21 pushes the movable end of the rubber cylinder 30 to expand the outer diameter of the rubber cylinder 30 when moving along the tube 10 under the driving of the pressure liquid in the piston cavity 20.

In one embodiment of the present invention, as shown in fig. 1 and 2, an expansion cavity 31 is provided between the inner wall of the rubber cylinder 30 and the outer wall of the tube 10; as shown in fig. 3, in the piston chamber 20, a first side 211 of the isolating piston communicates with the electrically controlled valve 40 and a second side 212 of the isolating piston communicates with the expansion chamber 31. When the packer is used, the second side 212 of the isolation piston in the piston cavity 20 is filled with hydraulic oil, the isolation piston 21 pushes the hydraulic oil into the expansion cavity 31, and the hydraulic oil in the expansion cavity 31 generates outward thrust on the rubber cylinder 30, so that the rubber cylinder 30 is expanded.

When the unsealing is needed, the pressure of the pressure liquid in the oil pipe is reduced, the ground sends an instruction to open the electronic control valve 40, the deformation restoring force of the rubber cylinder 30 drives the hydraulic oil in the expansion cavity 31 to flow back to the piston cavity 20, and meanwhile, the isolation piston 21 is pushed, so that the pressure liquid in the piston cavity 20 flows back to the pipe body 10 and the oil pipe; under the action of deformation recovery force, the outer diameter of the rubber cylinder 30 is gradually reduced, and the packing effect is lost, so that the upper layer and the lower layer of the oil well are communicated again. The packer can be repeatedly set and unset at any time according to requirements.

Further, both ends of the rubber cylinder 30 are connected to the tube 10 to limit the movement of both ends of the rubber cylinder 30 along the axial direction 101 of the tube, so that the rubber cylinder 30 is expanded radially outward under the action of the hydraulic oil in the expansion chamber 31.

In an embodiment of the present invention, a first rubber cylinder joint 301 is fixedly connected to an end of the rubber cylinder 30 close to the piston cavity 20, the first rubber cylinder joint 301 is connected to the pipe body 10, and an end of the first rubber cylinder joint 301 away from the rubber cylinder 30 is in sealing fit with an outer wall of the pipe body 10. After the electric control valve 40 is opened, the isolation piston 21 moves along the pipe 10 toward the rubber cylinder 30. The rubber sleeve 30 and the first rubber sleeve joint 301 can be connected in a vulcanization mode to ensure the firmness of connection. Preferably, the first glue cartridge connector 301 can slide on the pipe body 10 along the axial direction 101 of the pipe body, so that when the glue cartridge 30 expands, the first glue cartridge connector 301 can adjust the position along with the sliding; specifically, as shown in fig. 1, the first rubber cartridge connector 301 is sleeved outside the pipe body 10.

Further, an annular cavity 32 is arranged between the inner wall of the first rubber cylinder joint 301 and the outer wall of the pipe body 10, the annular cavity 32 is located between the expansion cavity 31 and the rubber cylinder 30, the annular cavity 32 is communicated with the expansion cavity 31, the annular cavity 32 is communicated with the second side 212 of the isolation piston in the piston cavity 20, the isolation piston 21 pushes hydraulic oil in the piston cavity 20 to enter the annular cavity 32 first, the hydraulic oil flows into the expansion cavity 31 through the annular cavity 32, and therefore it is beneficial to ensuring that the hydraulic oil uniformly enters the expansion cavity 31 in the circumferential direction, and the rubber cylinder 30 is uniformly expanded outwards.

In an embodiment of the present invention, a second rubber cylinder joint 302 is connected to an end of the rubber cylinder 30 away from the piston cavity 20, the second rubber cylinder joint 302 is fixedly connected to the pipe body 10, and the end of the rubber cylinder 30 away from the piston cavity 20 is kept fixed by the second rubber cylinder joint 302. Preferably, the rubber sleeve 30 is connected with the second rubber sleeve joint 302 in a vulcanization mode, so that the connection is firm.

Further, the second glue cartridge joint 302 is connected to the pipe body 10 by the first shear screw 33. When needing the deblocking, can lift oil pipe, the body 10 breaks first shear screw 33 along with lifting, makes second packing element joint 302 slide for the body 10, and the one end of packing element 30 is free state, and packing element 30 can shrink under the effect of the deformation recovery power of self and reset, loses the packing effect, makes upper and lower layering intercommunication. When the method is used for deblocking, the packer needs to be lifted to the ground for reassembly, and then the next setting is carried out.

As shown in fig. 1 and 4, the packer comprises slips 51, a slip bowl 52, a first connecting body 61 and a second connecting body 62, wherein the slip bowl 52 is sleeved outside the pipe body 10, the slips 51 are installed on the slip bowl 52, and the slips 51 can move in the radial direction relative to the slip bowl 52; the first connecting body 61 is abutted against one end of the slip 51, and the second connecting body 62 is abutted against the other end of the slip 51; moreover, the first connecting body 61 and the slip 51 are respectively provided with a conical surface 63 for abutting and matching, and/or the second connecting body 62 and the slip 51 are respectively provided with a conical surface 63 for abutting and matching; when the pressure fluid in the lumen 11 of the pipe body enters the piston cavity 20 through the electrically controlled valve 40, the first connecting body 61 can be pushed to move along the axial direction 101 of the pipe body, and the slips 51 are pushed by the first connecting body 61 to move outwards along the radial direction. Preferably, the slips 51 are bi-directional slips, and the slips 51 do not slip or move in either direction under external forces after being anchored to the casing.

The flow of pressure fluid between the piston chamber 20 and the lumen 11 of the tubular body is controlled by an electrically controlled valve 40; the flow of the pressure liquid is converted into the movement of the first connecting body 61 along the axial direction 101 of the pipe body; meanwhile, the movement of the first connecting body 61 along the axial direction 101 of the pipe body is converted into the radial movement of the slips 51 through the conical surface 63, so that the slips 51 are driven to be locked on the inner wall of the casing. The packer provides an outward expansion acting force for the slips 51 by pressure liquid in the oil pipe, and after the slips 51 and the casing are completely sealed, the electric control valve 40 is closed, so that the slips 51 are kept open, and the sealed state is maintained. The first connecting body 61 and the second connecting body 62 are both solids of revolution, and preferably, the first connecting body 61 and the slip 51 are respectively provided with a tapered surface 63 for abutting engagement, and the second connecting body 62 and the slip 51 are respectively provided with a tapered surface 63 for abutting engagement.

The second connector 62 may be fixed to the pipe body 10; it can also be movably connected to the tube 10 and the second connecting body 62 moves towards the first connecting body 61 when the pressure fluid in the lumen 11 of the tube enters the piston chamber 20 through the electrically controlled valve 40.

Preferably, the second connecting body 62 is fixed to the pipe body 10, and the slip seat 52 is sleeved outside the first connecting body 61 and the second connecting body 62; more preferably, the second connecting body 62 is fixedly connected to the pipe body 10 through a second shear screw 64, when the unsealing is required, the oil pipe can be lifted up, the pipe body 10 breaks the second shear screw 64 along with the lifting up, so that the second connecting body 62 can slide relative to the pipe body 10, one end of the slip 51 is in a free state, the supporting force of the outward movement is lost, and the forced unsealing is realized. When the method is used for deblocking, the packer needs to be lifted to the ground for reassembly, and then the next setting is carried out.

In order to convert the flow of the pressure fluid into the movement of the first connecting body 61 along the axial direction 101 of the pipe body, in one embodiment, a hydraulic cylinder 71 communicated with the piston cavity 20 is sleeved outside the pipe body 10, a slip piston 72 is arranged in the hydraulic cylinder 71, and the first connecting body 61 is connected with the slip piston 72; the slip piston 72 is driven in the axial direction 101 of the pipe body by the pressurized fluid in the pipe body lumen 11 entering the piston chamber 20 through the electrically controlled valve 40. As shown in fig. 1, an annular cavity is formed between the inner wall of the hydraulic cylinder 71 and the outer wall of the pipe body 10, and the slip piston 72 is slidably engaged with the inner wall of the hydraulic cylinder 71 and the outer wall of the pipe body 10, respectively.

The manner in which the slip piston 72 is actuated to move in the axial direction 101 of the pipe when pressurized fluid in the pipe lumen 11 enters the piston cavity 20 is not limited to one. For example: the hydraulic cylinder 71 is communicated with the piston cavity 20, when pressure fluid enters the piston cavity 20 through the electric control valve 40 and simultaneously enters the hydraulic cylinder 71, the pressure fluid directly pushes the slip piston 72 to move in the hydraulic cylinder 71 along the axial direction 101 of the pipe body. In this manner, the piston chamber 20 may be disposed between the glue cartridge 30 and the hydraulic cylinder 71.

In order to better achieve that the slip piston 72 is driven to move along the axial direction 101 of the pipe body when the pressure fluid in the pipe cavity 11 of the pipe body enters the piston cavity 20, the inventor proposes an optimized mode: as shown in fig. 1, an expansion cavity 31 is arranged between the inner wall of the rubber cylinder 30 and the outer wall of the tube body 10; in the piston chamber 20, a first side 211 of the isolating piston is communicated with the electric control valve 40, and a second side 212 of the isolating piston is communicated with the expansion chamber 31; the hydraulic cylinder 71 is screwed to the second glue cartridge joint 302, and the hydraulic cylinder 71 communicates with the piston chamber 20 through the expansion chamber 31. In use of the packer, the second side 212 of the isolation piston in the piston chamber 20 is filled with hydraulic oil, and the isolation piston 21 pushes the hydraulic oil into the expansion chamber 31, and simultaneously, the hydraulic oil flows through the expansion chamber 31 into the hydraulic cylinder 71, and pushes the slip piston 72 to move in the hydraulic cylinder 71 in the axial direction 101 of the pipe body.

When the sealing-off is needed, the pressure of the pressure liquid in the oil pipe is reduced, the ground sends a command to open the electric control valve 40, the first connecting body 61 loses the thrust, the slip 51 loses the supporting force of outward movement, and the sealing-off is achieved. The packer can be repeatedly set and unset at any time according to requirements.

As shown in fig. 1, the piston chamber 20, the packing element 30, the hydraulic cylinder 71 and the slip bowl 52 are sequentially arranged from top to bottom, so as to simplify the overall structure of the packer, facilitate the use of pressure fluid in the tubing to provide driving force, and drive the packing element 30 to expand and the slips 51 to open. The electronic control valve 40 is located at the upper end of the piston chamber 20, facilitating the installation of the electronic control valve 40 and the arrangement of the cable 41 connecting the electronic control valve 40.

In this packer, a plurality of slips 51 are circumferentially spaced apart and set in a slip bowl 52. In an embodiment of the present invention, a slip spring 53 for driving the slips 51 to move inward in a radial direction is disposed between the slip seat 52 and the slips 51, the slip spring 53 may be disposed in a radial direction, and both ends are connected to the slip seat 52 and the slips 51, respectively, when the slips 51 move outward, the slip spring 53 is compressed, and the slips 51 have a tendency to move inward due to the elastic force of the slip spring 53; when the first connecting body 61 and the second connecting body 62 lose the supporting force for the slips 51, the slips 51 move inwards under the action of the slip spring 53, automatic unsealing is realized, and the packer can move smoothly in the casing after being unsealed.

In one embodiment of the present invention, as shown in fig. 1, a return spring 73 connected to a slip piston 72 is provided in the hydraulic cylinder 71, and when the slip piston 72 moves toward the slips 51 by the pressure fluid in the pipe 10, the return spring 73 is compressed; when the sealing-off is needed, the pressure of the pressure liquid in the oil pipe is reduced, the ground sends a command to open the electronic control valve 40, the slip piston 72 and the first connecting body 61 are driven by the elastic force of the return spring 73 to move towards the direction far away from the slip 51, the slip 51 loses the outward supporting force, and the automatic sealing-off is realized.

The electric control valve 40 is internally integrated with a circuit board and electronic elements, is used for realizing communication with the ground and remote control, can be matched with an electric control type intelligent well for use, and realizes the full electric control function of oil well exploitation. As shown in fig. 1, the side wall of the tube 10 is provided with an axial through hole 13 through which the cable 41 is inserted. A cable 41 can be divided into two at the upper end of the packer, one of which is connected to the electrically controlled valve 40 in the packer and the other of which passes through the axial through hole 13 to connect to the packer below the packer, thereby facilitating simultaneous setting of multiple packers in the well and controlling setting and unsetting of each packer separately.

As shown in figures 1 and 2, the packer provided by the invention utilizes pressure fluid in an oil pipe to provide driving force for realizing setting, uses an electric control valve 40 as a control means for setting and unsetting, has few downhole electronic elements and large internal drift diameter, and can be connected with a plurality of packers through a cable 41; the oil well can be set and unsealed at any time according to the requirements, and the separate production and the combined production of the oil well can be realized more flexibly; can lift up the deblocking, have control convenience, stability is high, recoverable, advantage such as withstand voltage difference is big.

When the electric control mode of the packer fails to be unsealed, the oil lifting pipe increases the lifting force of the pipe body 10, the first shearing screw 33 and the second shearing screw 64 are broken by pulling the pipe body 10, and one end of the slip seat 52 and the second rubber barrel joint 302 are separated from the pipe body 10 and slide respectively; the slips 51 are returned by the return spring 73 and the slip spring 53, and the rubber cylinder 30 is returned. The packer realizes upward lifting and deblocking; it is lifted to the ground for re-assembly.

Example two

The present invention provides a completion structure, as shown in fig. 5, including: an oil pipe 2; at least one of the above-mentioned packers 1 disposed along the tubing 2; and the production allocation device 3 is arranged on each of two sides of the packer 1.

This well completion structure is suppressed to having oil pipe 2 through the ground pump truck, utilizes the pressure fluid in oil pipe 2 to provide the drive power that realizes setting, realizes the control to setting through automatically controlled valve 40, has saved power elements such as installation motor in the body of packer 1, has simplified the structure of packer 1, is favorable to reducing the space that mechanical parts took in packer 1, is convenient for realize great interior latus rectum, is favorable to improving the reliability of control.

In one embodiment, as shown in fig. 5, the well is divided into two intervals, one above packer 1 is used for packing between the two intervals, and an electrically controlled production distributor 3 is deployed at each interval. The operator uses the same cable 41 to connect two production distributors 3 and the packer 1, and can control each equipment in the well in real time from the surface, thereby achieving the purpose of layered mining. When there are n intervals, the operator can pack each interval using (n-1) packers 1. The circuit board mounted on the electrically controlled valve 40 can operate the selected packer 1 individually according to the instructions from the surface.

The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims (17)

1. A packer, comprising: the device comprises a pipe body, a rubber cylinder and an electric control valve; the rubber sleeve is sleeved outside the pipe body;

the tube body is provided with a piston cavity; the electric control valve is arranged on the tube body, is respectively communicated with the piston cavity and the tube cavity of the tube body and is used for controlling the connection and disconnection between the piston cavity and the tube cavity of the tube body;

an isolation piston is arranged in the piston cavity, pressure liquid in the tube cavity of the tube body can enter the piston cavity through the electric control valve to push the isolation piston to move, and the isolation piston drives the outer diameter of the rubber cylinder to expand outwards.

2. The packer of claim 1, wherein an expansion chamber is provided between an inner wall of the packing element and an outer wall of the tubular body;

in the piston cavity, a first side of the isolation piston is communicated with the electric control valve, and a second side of the isolation piston is communicated with the expansion cavity.

3. A packer as claimed in claim 2, wherein the second side of the isolation piston is filled with hydraulic oil in the piston chamber.

4. The packer of claim 2, wherein a first packing element joint is fixedly connected to one end of the packing element adjacent to the piston chamber, and the first packing element joint is connected to the pipe body.

5. The packer of claim 4, wherein the first rubber barrel joint is sleeved outside the pipe body.

6. The packer of claim 4, wherein an annular chamber is disposed between the inner wall of the first packing element sub and the outer wall of the tubular body, the annular chamber being disposed between the expansion chamber and the packing element, and wherein the annular chamber is in communication with the expansion chamber and the annular chamber is in communication with the second side of the isolation piston in the piston chamber.

7. The packer of claim 2, wherein a second packing element sub is coupled to an end of the packing element distal from the piston chamber, the second packing element sub being fixedly coupled to the tubular body.

8. The packer of claim 7, wherein the second packing element sub is coupled to the tubular body by a first shear screw.

9. A packer as claimed in any one of claims 1 to 8, wherein the packer comprises slips, a slip bowl, a first connector and a second connector, the slip bowl being located outside the tubular body, the slips being mounted to the slip bowl and being radially movable relative to the slip bowl;

the first connecting body is abutted against one end of the slip, and the second connecting body is abutted against the other end of the slip; the first connecting body and the slips are respectively provided with conical surfaces for abutting and matching, and/or the second connecting body and the slips are respectively provided with conical surfaces for abutting and matching;

when pressure liquid in the pipe cavity of the pipe body enters the piston cavity through the electric control valve, the first connecting body can be pushed to move along the axial direction of the pipe body, and the slips are pushed by the first connecting body to move outwards along the radial direction.

10. The packer of claim 9, wherein the second connector is fixedly attached to the tubular body by a second shear screw.

11. The packer as claimed in claim 9, wherein a hydraulic cylinder communicated with the piston cavity is arranged outside the pipe body, a slip piston is arranged in the hydraulic cylinder, and the first connecting body is connected with the slip piston; when pressure liquid in the pipe cavity of the pipe body enters the piston cavity through the electric control valve, the slip piston is driven to move along the axial direction of the pipe body.

12. The packer of claim 11, wherein an expansion chamber is disposed between an inner wall of the packing element and an outer wall of the tubular body;

in the piston cavity, a first side of the isolating piston is communicated with the electric control valve, and a second side of the isolating piston is communicated with the expansion cavity;

the hydraulic cylinder is fixedly connected to one end, far away from the piston cavity, of the rubber cylinder and is communicated with the piston cavity through the expansion cavity.

13. A packer as claimed in claim 12, wherein the piston chamber, the packing element, the hydraulic cylinder and the slip bowl are arranged in sequence from top to bottom.

14. A packer as claimed in claim 12, wherein a slip spring is provided between the slip bowl and the slips for urging the slips radially inwardly and/or a return spring is provided in the hydraulic cylinder connected to the slip piston.

15. A packer as claimed in claim 1, wherein the side wall of the tubular body has an axial through-hole for the passage of a cable therethrough.

16. A packer as claimed in claim 1, wherein the electrically controlled valve is a normally closed valve.

17. A completion structure, comprising:

an oil pipe;

at least one packer of any of claims 1-16 disposed along the tubing;

and the two sides of the packer are respectively provided with the production allocation device.

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