CN113294119B - 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 tube body; the pipe body is provided with a piston cavity; the electric control valve is arranged on the pipe body, is respectively communicated with the piston cavity and the pipe cavity of the pipe body and is used for controlling the on-off between the piston cavity and the pipe cavity of the pipe body; an isolation piston is arranged in the piston cavity, pressure liquid in the pipe cavity of the pipe 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 larger inner drift diameter, is convenient for a plurality of cooperation to use, 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 is mainly used for packing stratum and carrying out layering operation technology so as to realize oil field yield increase. Compared with the conventional packer, the electric control packer can control setting and unsetting of the packer from the ground in an electric control mode, can be reused, and has great advantages in aspects of oil well trial production, layered production, intelligent well completion technology and the like.

Patent CN201510607804.2 describes an electric packer, in which a microcontroller is used to control an execution motor to rotate in a setting mode, so that hydraulic oil pushes a setting piston to squeeze a packer rubber cylinder to realize setting; the deblocking mode also adopts the control to carry out motor reverse rotation to make hydraulic oil reverse flow, and the setting piston resets under the effect of negative pressure and packing element deformation force, realizes the deblocking. Although the function of electrically controlling setting and unsetting is realized, the control structure is complex, the number of underground electronic elements is large, and the diameter of the packer is small, so that the packer can be used singly.

Patent CN201610249172.1 describes an electric packer, in which the setting mode adopts a mode that a motor drives a hydraulic pump, and the hydraulic oil in an oil bag is pumped into a gap inside an expansion rubber cylinder to expand and seal the expansion rubber cylinder; during deblocking, the motor drives the deblocking mechanism to release pressure of hydraulic oil in the rubber cylinder, so that deblocking is realized. The patent adopts electric hydraulic energy as power to isolate the system from well fluid by using hydraulic oil, but the control structure is complex, the number of underground electronic elements is large, and the diameter of the packer is small, so that the system can be used singly.

Patent CN201210496729.3 describes an electronically controlled compression packer which adopts an annular hollow motor to drive an annular speed reducing mechanism to push a screw rod to perform forward and reverse movement so as to compress and release a rubber cylinder, thereby realizing setting and unsetting. The patent can be connected with a plurality of underground packers through one cable, the diameter of the inside of the packer is large, and the cable can pass through; however, the control accuracy and the operation stability are poor, and the 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 diameter, is convenient for a plurality of cooperation uses, has a simpler control structure and improves the control reliability.

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 cylinder is sleeved outside the pipe body; the pipe body is provided with a piston cavity; the electric control valve is arranged on the pipe body and is respectively communicated with the piston cavity and the pipe cavity of the pipe body and used for controlling the on-off between the piston cavity and the pipe cavity of the pipe body; an isolation piston is arranged in the piston cavity, pressure liquid in the pipe cavity of the pipe 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 tube connector is fixedly connected to one end, close to the piston cavity, of the rubber tube, and the first rubber tube connector is connected to the tube body.

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

In a preferred embodiment, an annular cavity is arranged between the inner wall of the first rubber sleeve joint and the outer wall of the pipe body, the annular cavity is positioned between the expansion cavity and the rubber sleeve, 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 connector, and the second rubber cylinder connector is fixedly connected to the pipe body.

In a preferred embodiment, the second rubber fitting is connected to the tube by a first shear screw.

In a preferred embodiment, the packer comprises a slip, a slip bowl, a first connector and a second connector, the slip bowl being disposed outside the pipe body, the slip being mounted to the slip bowl and the slip being radially movable relative to the slip bowl; the first connector is abutted with one end of the slip, and the second connector is abutted with the other end of the slip; the first connecting body and the slips are respectively provided with conical surfaces for abutting fit, and/or the second connecting body and the slips are respectively provided with conical surfaces for abutting fit; when the 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 first connecting body pushes the slips to move outwards along the radial direction.

In a preferred embodiment, the second connector is fixedly connected to the tube 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; and when the 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; the first side of the isolating piston is communicated with the electric control valve, and the 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 chamber, the packing element, the hydraulic cylinder and the slip bowl are arranged in sequence from top to bottom.

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

In a preferred embodiment, an axial through hole is provided in the side wall of the tube body through which the cable is threaded.

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

The present invention provides a completion structure comprising:

an oil pipe;

at least one packer as described above disposed along the tubing;

and the two sides of the packer are respectively provided with the yield regulator.

The invention has the characteristics and advantages that:

the packer is connected with the oil pipe, and after the packer enters a designated position of the oil well along with the oil pipe, the packer sends an instruction 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 pressure in the pipe cavity of the pipe body is increased together by pressing the inside of the oil pipe by the ground pump truck, pressure liquid in the pipe cavity of the pipe body enters the piston cavity to push the isolation piston to move, so that the outer diameter of the rubber cylinder is outwards expanded, the outer wall of the rubber cylinder is in sealing contact with the inner wall of the sleeve, and the layering of the oil well is realized. After the pressure liquid entering the piston cavity reaches a specified value, the electric control valve is controlled to be closed, the piston cavity is disconnected from the pipe cavity of the pipe body, the pressure liquid in the piston cavity is sealed, so that the rubber cylinder is kept to expand and prop open, and the setting state is maintained.

The packer utilizes pressure liquid in the oil pipe to provide driving force for realizing setting, realizes the control of setting through the electric control valve, omits power elements such as a motor and the like arranged in the packer body, simplifies the structure of the packer, is beneficial to reducing the space occupied by mechanical parts, is convenient to realize larger inner drift diameter, and is matched with a plurality of oil wells for use; and the control reliability is improved. The voltage of the 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 of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic illustration of the packer of FIG. 1 in a set condition;

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

FIG. 4 is a partial enlarged view at B in FIG. 1;

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

Reference numerals illustrate:

1. a packer; 2. an oil pipe; 3. a yield regulator;

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

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

30. a rubber cylinder; 301. a first rubber sleeve joint; 302. the second rubber sleeve joint; 31. expanding the cavity; 32. an annular cavity; 33. a first shear screw;

40. an electric control valve; 41. a cable;

51. a slip; 52. 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. and a return spring.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

The present invention provides a packer, as shown in fig. 1, comprising: the pipe 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 pipe body 10, and the electric control valve 40 is respectively communicated with the piston cavity 20 and the pipe cavity 11 of the pipe body and is used for controlling the on-off between the piston cavity 20 and the pipe cavity 11 of the pipe body; the isolating 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 the electric control valve 40, the isolating piston 21 is pushed to move, and the isolating piston 21 drives the outer diameter of the rubber cylinder 30 to expand outwards. The electric control valve 40 may 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 upon power failure, maintaining pressure in the piston chamber 20; specifically, the electric control valve 40 is a normally closed solenoid valve. The piston cavity 20 can be formed on the side wall of the pipe body 10 in a drilling way; as shown in fig. 3, the sidewall of the tube body 10 is bored with a connection hole 12, and the electronic control valve 40 communicates with the lumen 11 of the tube body through the connection hole 12.

The upper end and the lower end of the pipe body 10 in the packer are respectively connected with an oil pipe through an oil pipe buckle, and after the packer is put into a designated position of an oil well along with the oil pipe, an instruction is sent to the electric control valve 40, so that the electric control valve 40 is in an open state, and the piston cavity 20 is communicated with the pipe cavity 11 of the pipe body; the pressure in the pipe cavity 11 of the pipe body is increased together by pressing the inside of the oil pipe by the ground pump truck, pressure liquid in the pipe cavity 11 of the pipe body enters the piston cavity 20 to push the isolation piston 21 to move, so that 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 the layering of the oil well is realized. After the pressure liquid entering the piston cavity reaches a specified value, the electric control valve 40 is controlled to be closed, the piston cavity 20 is disconnected from the pipe cavity 11 of the pipe body, the pressure liquid in the piston cavity 20 is sealed, the rubber cylinder 30 is kept open, and the setting state is maintained.

The packer utilizes pressure liquid in an oil pipe to provide driving force for realizing setting, realizes the control of setting through the electric control valve 40, omits power elements such as a motor and the like arranged in the body of the packer, simplifies the structure of the packer, is beneficial to reducing the space occupied by mechanical parts, is convenient to realize larger inner drift diameter, and can be matched with a plurality of oil wells for use; and the control reliability is improved. The voltage of the cable connected with the ground in the packer is smaller, so that the wire diameter of the cable is smaller.

There are various ways of using the movement of the isolation piston 21 to drive the outer diameter of the packing element 30 to expand outwardly, such as: the isolating piston 21 directly applies pushing force to the rubber cylinder 30 to drive the rubber cylinder 30 to expand; alternatively, the packing element 30 is indirectly driven to expand by the flowing medium when the isolation piston 21 moves.

In an embodiment, one end of the rubber cylinder 30 is fixed outside the pipe body 10, the other end of the rubber cylinder 30 can move along the pipe body 10, the isolation piston 21 is connected with the movable end of the rubber cylinder 30, and when the isolation piston 21 is driven by the pressure liquid in the piston cavity 20 to move along the pipe body 10, the movable end of the rubber cylinder 30 is pushed, so that the rubber cylinder 30 is extruded and the outer diameter is expanded.

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

When the oil pipe needs to be unsealed, the pressure of the pressure liquid in the oil pipe is reduced, the ground sends out an instruction to enable the electric control valve 40 to be opened, the deformation restoring force of the rubber cylinder 30 drives hydraulic oil in the expansion cavity 31 to flow back to the piston cavity 20, and meanwhile the isolation piston 21 is pushed to enable the pressure liquid in the piston cavity 20 to flow back to the pipe body 10 and the oil pipe; the outer diameter of the rubber cylinder 30 is gradually reduced under the action of deformation restoring force, the sealing function is lost, and the upper and lower layers of the oil well are communicated again. The packer can be set repeatedly, and can be set and unset at any time according to the requirement.

Further, both ends of the rubber cylinder 30 are connected with the pipe body 10, so as to limit the movement of both ends of the rubber cylinder 30 along the axial direction 101 of the pipe body, and facilitate the radial outward expansion of the rubber cylinder 30 under the action of hydraulic oil in the expansion cavity 31.

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

Further, an annular cavity 32 is arranged between the inner wall of the first rubber tube joint 301 and the outer wall of the tube body 10, the annular cavity 32 is located between the expansion cavity 31 and the rubber tube 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 the hydraulic oil is guaranteed to uniformly enter the expansion cavity 31 in the circumferential direction, so that the rubber tube 30 is uniformly expanded outwards.

In an embodiment of the present invention, a second rubber connector 302 is connected to an end of the rubber 30 away from the piston cavity 20, the second rubber connector 302 is fixedly connected to the pipe body 10, and the end of the rubber 30 away from the piston cavity 20 is kept fixed by the second rubber connector 302. Preferably, the glue barrel 30 is vulcanized with the second glue barrel joint 302 to ensure the firmness of the connection.

Further, the second rubber joint 302 is connected with the pipe body 10 by a first shear screw 33. When the oil pipe needs to be unsealed, the oil pipe can be lifted, the pipe body 10 is lifted up along with the first shear screw 33 to enable the second rubber sleeve joint 302 to slide relative to the pipe body 10, one end of the rubber sleeve 30 is in a free state, the rubber sleeve 30 can shrink and reset under the action of self deformation restoring force, the sealing effect is lost, and the upper layer and the lower layer are communicated. In this way, the packer is set again after the surface has been set again.

As shown in fig. 1 and 4, the packer comprises a slip 51, a slip bowl 52, a first connector 61 and a second connector 62, the slip bowl 52 is sleeved outside the pipe body 10, the slip 51 is mounted on the slip bowl 52, and the slip 51 can move radially relative to the slip bowl 52; the first connector 61 is abutted against one end of the slip 51, and the second connector 62 is abutted against the other end of the slip 51; the first connector 61 and the slips 51 are respectively provided with a conical surface 63 for abutting engagement, and/or the second connector 62 and the slips 51 are respectively provided with a conical surface 63 for abutting engagement; when the pressure liquid in the pipe cavity 11 of the pipe body enters the piston cavity 20 through the electric control valve 40, the first connecting body 61 can be pushed to move along the axial direction 101 of the pipe body, and the first connecting body 61 pushes the slips 51 to move outwards in the radial direction. Preferably, the slips 51 are bi-directional slips, and the slips 51 do not slide or move in both the up and down directions under external forces after being anchored to the casing.

Controlling the flow of pressurized liquid between the piston chamber 20 and the lumen 11 of the tube body by means of an electrically controlled valve 40; and, the flow of the pressure liquid is converted into the movement of the first connecting body 61 in the axial direction 101 of the pipe body; at the same time, movement of the first coupling body 61 in the axial direction 101 of the pipe body is translated into radial movement of the slips 51 by the tapered surface 63, which forces the slips 51 to lock against the casing inner wall. The packer is provided with an outward expanding acting force of the slips 51 by pressure liquid in the oil pipe, and after the slips 51 and the casing are completely set, the electric control valve 40 is closed, so that the slips 51 are kept open, and the set state is maintained. The first connecting body 61 and the second connecting body 62 are both revolution bodies, and preferably, the first connecting body 61 and the slips 51 are respectively provided with tapered surfaces 63 for abutting engagement, and the second connecting body 62 and the slips 51 are respectively provided with tapered surfaces 63 for abutting engagement.

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

Preferably, the second connector 62 is fixed on the pipe body 10, and the slip bowl 52 is sleeved outside the first connector 61 and the second connector 62; more preferably, the second connector 62 is fixedly connected to the pipe body 10 through the second shear screw 64, when the pipe body 10 needs to be unsealed, the pipe body 10 can lift the oil pipe, and the second shear screw 64 is broken along with the lifting, so that the second connector 62 can slide relative to the pipe body 10, one end of the slip 51 is in a free state, and the supporting force for outward movement is lost, so that the forced unsealing is realized. In this way, the packer is set again after the surface has been set again.

To convert the flow of pressurized fluid into a movement of the first connection body 61 in the axial direction 101 of the pipe body, in one embodiment the pipe body 10 is sheathed with a hydraulic cylinder 71 in communication with the piston chamber 20, a slip piston 72 being provided in the hydraulic cylinder 71, the first connection body 61 being connected to the slip piston 72; the slip piston 72 is driven to move in the axial direction 101 of the pipe body as pressurized fluid in the pipe body lumen 11 enters 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 urged to move in the axial direction 101 of the pipe body as pressurized fluid in the pipe body lumen 11 enters the piston chamber 20 is achieved is not limited to one type. For example: the hydraulic cylinder 71 is communicated with the piston cavity 20, and when pressure liquid enters the piston cavity 20 through the electric control valve 40, the pressure liquid enters the hydraulic cylinder 71 at the same time, and the pressure liquid 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 packing element 30 and the hydraulic cylinder 71.

To better achieve that the slip piston 72 is driven in the axial direction 101 of the pipe body when the pressurized liquid in the pipe lumen 11 of the pipe body enters the piston chamber 20, the inventors propose an optimized way: 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 pipe body 10; in the piston chamber 20, a first side 211 of the isolation piston is communicated with the electric control valve 40, and a second side 212 of the isolation piston is communicated with the expansion chamber 31; the hydraulic cylinder 71 is screwed to the second packing adapter 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, 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, pushing the slip piston 72 to move in the axial direction 101 of the pipe body in the hydraulic cylinder 71.

When the oil pipe needs to be unsealed, the pressure of pressure liquid in the oil pipe is reduced, the ground sends out an instruction to enable the electric control valve 40 to be opened, the first connector 61 loses thrust, the slips 51 lose supporting force for outward movement, and the unsealing is achieved. The packer can be set repeatedly, and can be set and unset at any time according to the requirement.

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 in the order from top to bottom to simplify the overall structure of the packer, so that the pressure liquid in the oil pipe can be used for providing driving force, and the packing element 30 is driven to expand and the slip 51 is driven to be spread. The electric control valve 40 is located at the upper end of the piston chamber 20, facilitating the installation of the electric control valve 40 and the arrangement of a cable 41 connecting the electric control valve 40.

In this packer, a plurality of slips 51 are circumferentially spaced apart in slip bowl 52. In one embodiment of the present invention, a slip spring 53 for driving the slip 51 to move radially inwards is provided between the slip bowl 52 and the slip 51, the slip spring 53 may be provided radially, and both ends are respectively connected to the slip bowl 52 and the slip 51, when the slip 51 moves outwards, the slip spring 53 is compressed, and the slip 51 has a tendency to move inwards due to the elastic force of the slip spring 53; when the first connector 61 and the second connector 62 lose the supporting force to the slips 51, the slips 51 move inwards under the action of the slip springs 53, automatic deblocking is achieved, and smooth movement in the casing after packer deblocking is facilitated.

In one embodiment of the present invention, as shown in fig. 1, a return spring 73 is provided in the hydraulic cylinder 71 and connected to the slip piston 72, and the return spring 73 is compressed when the slip piston 72 moves toward the slip 51 under the action of the pressure liquid in the pipe body 10; when the oil pipe is required to be unsealed, the pressure of pressure liquid in the oil pipe is reduced, the ground sends out an instruction to enable the electric control valve 40 to be opened, the elastic force of the reset spring 73 drives the slip piston 72 and the first connecting body 61 to move in a direction away from the slip 51, the slip 51 loses the outward supporting force, and automatic unsealing is achieved.

The electric control valve 40 is 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, an axial through hole 13 through which the cable 41 is inserted is provided in a side wall of the pipe body 10. One cable 41 may be split 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 bore 13 to connect to the packer below the packer, thereby facilitating simultaneous setting of multiple packers in the well and controlling the setting and unsetting of each packer separately.

As shown in fig. 1 and 2, the packer provided by the invention uses pressure liquid in an oil pipe to provide driving force for realizing setting, uses an electric control valve 40 as a setting and unsetting control means, has few downhole electronic elements and large internal path, and can be connected with a plurality of packers through a cable 41; the oil well can be set and unset at any time according to the needs, and the separate production and the combined production of the oil well can be realized more flexibly; can be lifted and unsealed, and has the advantages of convenient control, high stability, recoverability, large pressure resistance difference and the like.

When the packer is not successfully unpacked in an electric control mode, the lifting force of the pipe body 10 is increased, the first shearing screw 33 and the second shearing screw 64 are lifted and broken on the pipe body 10, and one end of the slip seat 52 and the second rubber sleeve joint 302 are separated from the pipe body 10 and slide; the slips 51 return under the action of the return spring 73 and the slip springs 53, and the rubber cylinder 30 returns. The packer realizes lifting and deblocking; ground reassembly is mentioned above.

Example two

The present invention provides a completion structure, as shown in fig. 5, comprising: an oil pipe 2; at least one packer 1 as described above, set along the tubing 2; and the two sides of the packer 1 are respectively provided with the yield regulator 3.

According to the well completion structure, the ground pump truck presses the oil pipe 2, the pressure liquid in the oil pipe 2 is utilized to provide driving force for realizing setting, the electric control valve 40 is utilized to control setting, power elements such as a motor and the like are omitted from being installed in the body of the packer 1, the structure of the packer 1 is simplified, the space occupied by mechanical parts in the packer 1 is reduced, the larger inner diameter is convenient to realize, and the reliability of control is improved.

In one embodiment, as shown in fig. 5, the well is divided into an upper interval and a lower interval, the two intervals are sealed by the packer 1, and each layer is provided with an electrically controlled production allocation device 3. The operator connects the two production distributors 3 and the packer 1 by using the same cable 41, and can control each underground equipment from the ground in real time, thereby realizing the purpose of layer 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 in accordance with surface instructions.

The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention in light of the disclosure herein without departing from the spirit and scope of the invention.

Claims (12)

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

the pipe body is provided with a piston cavity; the electric control valve is arranged on the pipe body and is respectively communicated with the piston cavity and the pipe cavity of the pipe body and used for controlling the on-off between the piston cavity and the pipe cavity of the pipe body;

an isolation piston is arranged in the piston cavity, pressure liquid in the pipe cavity of the pipe 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;

an expansion cavity is arranged between the inner wall of the rubber cylinder and the outer wall of the pipe body;

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

the packer comprises a slip, a slip seat, a first connecting body and a second connecting body, wherein the slip seat is sleeved outside the pipe body, the slip is installed on the slip seat, and the slip can move along the radial direction relative to the slip seat;

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

when the 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 first connecting body pushes the slips to move outwards along the radial direction;

the pipe body is provided with a hydraulic cylinder communicated with the piston cavity, a slip piston is arranged in the hydraulic cylinder, and the first connecting body is connected with the slip piston; when the 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;

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;

the piston cavity, the expansion cavity, the hydraulic cylinder and the slip seat are sequentially arranged from top to bottom;

the packer utilizes pressurized fluid in the tubing to provide a driving force to effect the slip setting and the outer diameter of the packing element to expand outwardly to effect the packing.

2. The packer of claim 1, wherein a second side of the isolation piston is filled with hydraulic oil in the piston chamber.

3. The packer of claim 1, wherein a first packing element joint is fixedly connected to one end of the packing element adjacent to the piston chamber, the first packing element joint being connected to the tubular body.

4. The packer of claim 3, wherein the first packing element joint is sleeved outside the tubular body.

5. The packer of claim 3, wherein an annular chamber is disposed between an inner wall of the first packing element joint and an outer wall of the tubular body, the annular chamber being located between the expansion chamber and the packing element and in communication with the expansion chamber, the annular chamber in communication with a second side of the isolation piston in the piston chamber.

6. The packer of claim 1, wherein an end of the packing element distal from the piston chamber is connected with a second packing element fitting, the second packing element fitting being fixedly connected to the tubular body.

7. The packer of claim 6, wherein the second packing element joint is connected to the tubular body by a first shear screw.

8. The packer of claim 1, wherein the second connection body is fixedly connected to the tubular body by a second shear screw.

9. The packer of claim 1, wherein a slip spring is provided between the slip bowl and the slips for driving the slips radially inward and/or a return spring is provided in the hydraulic cylinder in connection with the slip piston.

10. The packer of claim 1, wherein an axial through hole is provided in a sidewall of the tubular body through which the cable is threaded.

11. The packer of claim 1, wherein the electrically controlled valve is a normally closed valve.

12. A completion structure comprising:

an oil pipe;

at least one packer according to any one of claims 1-11 arranged along said tubing;

and the two sides of the packer are respectively provided with the yield regulator.

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