CN117287142A - Packer capable of repeating electric setting and electric deblocking - Google Patents
Packer capable of repeating electric setting and electric deblocking Download PDFInfo
- Publication number
- CN117287142A CN117287142A CN202311586148.3A CN202311586148A CN117287142A CN 117287142 A CN117287142 A CN 117287142A CN 202311586148 A CN202311586148 A CN 202311586148A CN 117287142 A CN117287142 A CN 117287142A
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- China
- Prior art keywords
- piston
- cylinder
- oil
- packer
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000003921 oil Substances 0.000 claims abstract description 117
- 238000012856 packing Methods 0.000 claims abstract description 52
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 3
- 210000002445 nipple Anatomy 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 125000003003 spiro group Chemical group 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
- E21B33/1285—Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
Abstract
The invention relates to a repeatable electric setting and deblocking packer, which comprises an outer protection pipe, wherein the lower end of the outer protection pipe is provided with a packing rubber cylinder, the inside of the upper end of the outer protection pipe is provided with an electric telescopic device, the inside of the lower end of the outer protection pipe is sequentially provided with a piston and an oil cylinder, one end of the piston is adjacent to the packing rubber cylinder, the other end of the piston is communicated with the oil cylinder, the end part of the electric telescopic device is provided with a plunger, and one end of the plunger stretches into the oil cylinder; the electric telescopic device drives the plunger to move towards the lower end of the outer protective tube, so that hydraulic oil in the oil cylinder enters a piston cavity of the piston to push the piston to move forwards to squeeze the packing rubber cylinder, and the packer is set; the electric telescopic device drives the plunger to move towards the upper end of the outer protective tube to reduce the pressure in the oil cylinder, hydraulic oil in the piston cavity flows back to the oil cylinder to enable the piston to move backwards to enable the packing rubber to retract and release, and the packer is unsealed. The invention can realize larger extrusion force of the rubber cylinder without excessive torsion, and has simple operation and low labor intensity.
Description
Technical Field
The invention belongs to the technical field of petroleum underground power packing tools, and relates to a packer capable of repeatedly conducting electric setting and electric deblocking.
Background
The packer is a commonly used downhole tool for tubing casing annulus packing. The packer is often used for underground layering test, water finding and water plugging operation, and mainly depends on mechanical force or water pressure difference as power to expand the packing rubber cylinder so as to seal an oil sleeve annulus. When the existing packer is set, a pump truck is required to be used for pressurizing a wellhead, a piston in the packer acts under the action of the pressure of the pump truck to axially squeeze the packing rubber cylinder to realize setting, however, the pump truck is used for pressurizing operation, so that the labor intensity of operation is high, and the operation cost is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a packer capable of repeatedly conducting electric setting and electric deblocking, hydraulic oil is controlled to enter and exit a piston cavity through an electric telescopic device to push a piston to squeeze or release a packing rubber cylinder to realize setting or deblocking of the packer, the packer can be put down in a well for multiple times, larger extrusion force of the rubber cylinder can be realized without excessive torsion, and the packer is easy to operate and low in labor intensity.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a repeatable electric setting and electric unsetting packer, characterized in that: the hydraulic oil cylinder is characterized by comprising an outer protection pipe, wherein the lower end of the outer protection pipe is provided with a sealing rubber cylinder, the inside of the upper end of the outer protection pipe is provided with an electric telescopic device, the inside of the lower end of the outer protection pipe is provided with a piston and an oil cylinder in sequence, one end of the piston is adjacent to the sealing rubber cylinder, the other end of the piston is communicated with the oil cylinder, the end part of the electric telescopic device is provided with a plunger, and one end of the plunger stretches into the oil cylinder; the electric telescopic device drives the plunger to move towards the lower end of the outer protection tube so that hydraulic oil in the oil cylinder enters a piston cavity of the piston to push the piston to move forwards to squeeze the packing rubber cylinder, the packer is set, the electric telescopic device drives the plunger to move towards the upper end of the outer protection tube so that the pressure in the oil cylinder is reduced, and the hydraulic oil in the piston cavity flows back to the oil cylinder to enable the piston to move backwards so that the packing rubber cylinder is retracted and released, and the packer is unsealed.
Further, the lower extreme cover of electric telescopic device is equipped with the lead screw pillar, the lower extreme nestification of lead screw pillar the hydro-cylinder, the lower extreme of outer pillar is provided with the crossover sub, the hydro-cylinder passes the lower extreme cover of crossover sub and establishes the piston, the lower extreme of piston sets up seal packing element, seal packing element endotheca is equipped with the center tube, the upper end of center tube is provided with the relief valve, the upper end of relief valve is provided with the oil circuit, the oil circuit link up relief valve and hydro-cylinder.
Further, the piston comprises an upper piston and a lower piston, the upper piston and the lower piston are sleeved up and down, a piston cavity is formed at the sleeved parts of the upper piston and the lower piston, the piston cavity comprises a piston upper cavity and a piston lower cavity, the piston upper cavity is used as an air cavity for resisting balanced environmental pressure, and the piston lower cavity is used as a hydraulic oil cavity for pushing the packing rubber cylinder to extrude.
Further, the lower extreme of plunger is provided with prevents the rotating head, be provided with steel ball and anti-rotating groove between anti-rotating head and the hydro-cylinder, the steel ball inlays the periphery of establishing at the anti-rotating head, anti-rotating groove sets up on the anti-rotating head of steel ball lower extreme, plunger and steel ball and anti-rotating groove coaxial motion prevent that the plunger radially rotates.
Further, the lower end of the packing rubber cylinder is provided with a lower outer joint, a central pipe in the packing rubber cylinder is sleeved with an oil return bottle, the upper end of the oil return bottle is communicated with the oil cylinder after passing through the pressure relief valve and the oil way, and a central pipe flow channel is formed between the inner periphery of the central pipe and the outer periphery of the oil cylinder, the pressure relief valve and the oil return bottle; the lower end of the oil return bottle is nested in the lower outer joint, the lower end of the oil return bottle is provided with a lower inner joint, and the lower inner joint is sleeved in the lower outer joint.
Further, a screw groove sleeve is sleeved in the lower end of the adapter, a second spiral ring is sleeved in the upper end of the adapter, and the screw groove sleeve and the second spiral ring are sleeved on the periphery of the central tube; the lower extreme periphery of adapter is provided with the safety screw, the tip embedding of safety screw the screw inslot is cut by adapter's shearing force back, adapter is slided to the second spiral ring upward, the hydro-cylinder then moves and opens the relief valve.
Further, the output end of the electric telescopic device is provided with magnetic steel and a Hall element for detecting the compression stroke of the packing rubber cylinder.
Further, the outside cover of electric telescopic device is equipped with the motor pillar, the lower extreme of motor pillar is provided with the bearing frame and connects the lead screw pillar, the upper end of motor pillar is provided with single core socket, the lower extreme of lower nipple still is provided with single core plug, lower nipple and single core plug ring cover are in outer joint down.
Further, the electric telescopic device further comprises a motor, a screw rod is connected to the motor, and one end of the screw rod is connected with the plunger through a nut.
Further, the lower extreme of oil return bottle is provided with down the sealing plug, one side of bearing frame is provided with the sealing plug, go up sealing plug and lower sealing plug and connect the cable at both ends about the packer.
By adopting the technical scheme, the invention has the following advantages and effects:
(1) The invention provides a packer capable of repeating electric setting and electric unsetting, wherein an electric telescopic device in the packer adopts a screw nut mechanism, and the motor current of the screw nut mechanism is not more than 500mA, so that the reciprocating thrust of a plunger is converted into hydraulic thrust to be 9-12 tons, a high-torque speed reducer is avoided, and the internal mechanical space of the packer is reduced.
(2) According to the packer capable of repeating electric setting and electric deblocking provided by the invention, the pressure release valve is arranged in the packer, when a fault occurs and deblocking is impossible, a lifting force of 2-3 tons can be adopted to lift the pipe column, the safety screw is sheared, the pressure release valve is opened, hydraulic oil in the piston cavity flows back into the oil return bottle through the oil way, and the oil return bottle is sealed and isolated from the outside, so that smooth pressure relief can be ensured under a high-pressure environment; meanwhile, the piston is provided with an air cavity and a hydraulic oil cavity, the air cavity is used for resisting balanced ambient pressure, and the hydraulic oil cavity is used for pushing the packing rubber cylinder to extrude, so that the packer can not increase extra setting extrusion force under a high-pressure environment.
(3) According to the packer capable of repeating electric setting and electric deblocking, when the packing rubber cylinder is replaced, only the outer joint is required to be disassembled, the rubber sleeve on the sealing plug is pulled out, then the inner joint and the adapter sleeve are disassembled, oil discharging operation is not required, and the packing rubber cylinder is convenient to replace; and can realize once well entry and multiple setting and unsetting.
Drawings
FIG. 1 is a schematic diagram of a repeatable electric setting and electric unsetting packer according to the present invention.
The reference numerals are as follows:
1-an outer protective tube; 2-a circuit skeleton; 3-a motor protection tube; 4-single-core socket; 5-a motor; a 6-coupling; 7-a bearing; 8-bearing seats; 9-upper sealing plug; 10-limit switches; 11-screw rod; 12-a lead screw protection tube; 13-a nut; 14-a plunger; 15-an oil cylinder; 16-flower tube; 17-an oil cylinder sealing head; 18-steel balls; 19-an anti-rotation groove; a 20-adapter; 21-a safety screw; 22-piston; 23-an oil path; 24-a pressure release valve; 25-a central tube; 26-packing rubber cylinder; 27-an oil return bottle; 28-lower sealing plug; 29-single core plug; 30-lower outer joint; 31-lower inner joint; 32-a first spiro ring; 33-anti-swivel; 34-motor joint; 35-a screw groove sleeve; 36-a second spiro ring; 37-an adapter sleeve; 201-a circuit board; 161-central tube flow channel; 221-an upper piston chamber; 222-a piston lower chamber; 223-a filler plug; 601-magnetic steel; 602-hall element.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
The invention provides a repeatable electric setting and electric deblocking packer, wherein an electric telescopic device is arranged at the upper end in an outer protection pipe, an oil cylinder is arranged at the lower end in the outer protection pipe, the electric telescopic device drives a plunger to extend into the oil cylinder to reciprocate, when the plunger moves downwards, hydraulic oil in the oil cylinder enters a piston cavity through an oil way to push the piston to squeeze a packing rubber cylinder downwards, the packing rubber cylinder expands, and the packer is set; when the plunger moves upwards, the pressure in the oil cylinder is reduced, hydraulic oil in the piston cavity flows back to the oil cylinder through the oil way, the piston moves upwards to seal the packing rubber cylinder to retract and release, and the packer is unsealed. The invention can realize multiple setting after one well entry, can realize strong extrusion force of the rubber cylinder without excessive torsion, and has simple operation and low labor intensity.
As shown in fig. 1. The invention relates to a repeatable electric setting and deblocking packer, which comprises an outer protection pipe 1, wherein the lower end of the outer protection pipe 1 is provided with a packing rubber sleeve 26, the inside of the upper end of the outer protection pipe 1 is provided with an electric telescopic device, the inside of the lower end of the outer protection pipe 1 is sequentially provided with a piston 22 and an oil cylinder 15 up and down, one end of the piston 22 is adjacent to the packing rubber sleeve 26, the other end of the piston 22 is communicated with the oil cylinder 15, the end part of the electric telescopic device is provided with a plunger 14, and one end of the plunger 14 stretches into the oil cylinder 15; the electric telescopic device drives the plunger 14 to move downwards so that hydraulic oil in the oil cylinder 15 enters a piston cavity of the piston 22 to push the piston 22 to move forwards to squeeze the packing rubber 26, and the packer is set; the electric telescopic device drives the plunger 14 to move upwards so as to reduce the pressure in the oil cylinder 15, hydraulic oil in a piston cavity of the piston 22 flows back to the oil cylinder 15 to enable the piston 22 to move backwards so as to retract and release the packing rubber 26, and the packer is unpacked.
Specifically speaking, the inside motor protection tube 3 that still is provided with of upper end of outer protection tube 1, the lower extreme of motor protection tube 3 is provided with lead screw protection tube 12, and motor protection tube 3 and lead screw protection tube 12 are through the cover setting in the upper and lower butt joint of the periphery of bearing frame 8. An annular liquid passage is formed between the outer circumferences of the motor protection tube 3 and the lead screw protection tube 12 and the inner circumference of the outer protection tube 1. The packer can be used in series with other logging instruments due to the annular liquid passage, so that multiple setting and unsetting of one-time logging are realized. The motor protection tube 3 is internally provided with a single-core socket 4, a circuit framework 2, a circuit board 201, a motor 5, a coupler 6, a motor connector 34 and a screw rod 11 from top to bottom in sequence, the circuit framework 2 is fixedly provided with the circuit board 201 to control the motor 5, the motor 5 is fixed on the motor connector 34, the output end of the motor 5 drives the screw rod 11 to rotate through the coupler 6, the screw rod 11 is externally sleeved with a bearing 7, the bearing 7 is supported in a bearing seat 8, and the bearing seat 8 is nested at the lower end of the motor protection tube 3 to connect the screw rod protection tube 12. The circuit board 201 provides power to the motor 5, and simultaneously collects the voltage and current of the motor 5. The motor 5 is connected with the screw rod 11 through the coupler 6, and the nut 13 converts the rotary motion into linear reciprocating motion to drive the plunger 14 to axially reciprocate.
Further, the lower extreme cover of electric telescopic device establishes lead screw pillar 12, the lower extreme nestification of lead screw pillar 12 hydro-cylinder 15, the lower extreme of outer pillar 1 is provided with crossover sub 20, and hydro-cylinder 15 passes crossover sub 20's lower extreme cover is established piston 22, piston 22's lower extreme sets up seals packing element 26, seal packing element 26 endotheca is equipped with center tube 25, the upper end of center tube 25 is provided with relief valve 24, the upper end of relief valve 24 is provided with oil circuit 23, and oil circuit 23 link up relief valve 24 and hydro-cylinder 15.
Specifically, the motor 5, the coupling 6, the nut 13 and the screw 11 constitute an electric telescopic device. The lower end of the screw rod 11 is connected with a plunger 14 through a nut 13, and the nut 13 and the plunger 14 are fixedly connected together through threads. The screw rod 11, the nut 13 and the plunger 14 are sleeved in the screw rod protection tube 12, the lower end of the screw rod protection tube 12 is nested with the oil cylinder 15, the lower end of the plunger 14 extends into the oil cylinder 15, the outer periphery of the oil cylinder 15 is sleeved with a first spiral ring 32, the oil cylinder 15 is fixed in the outer protection tube 1 through the first spiral ring 32, the outer periphery of the oil cylinder 15 at the lower end of the first spiral ring 32 is sleeved with a flower tube 16, and the flower tube 16 and the oil cylinder 15 are connected together through the first spiral ring 32.
Further, the piston 22 includes an upper piston and a lower piston, the upper piston and the lower piston are sleeved up and down, and the sleeved parts of the upper piston and the lower piston form an annular piston cavity, and the piston cavity includes an upper piston cavity 221 and a lower piston cavity 222. The upper chamber 221 and the lower chamber 222 are sealed up and down. The upper chamber 221 may be used as an air chamber to resist the balance of ambient pressure, and the lower chamber 222 may be used as a hydraulic oil chamber to push the packing element 26 to compress. The radial outer periphery of the piston 22 is provided with an oil filling plug 223, the oil filling plug 223 penetrates radially through the bottom of the piston lower chamber 222, and hydraulic oil can be filled into the piston lower chamber 222 through the oil filling plug 223.
Specifically, when the circuit board 201 controls the motor 5 to rotate forward and drives the plunger 14 to move downwards through the screw rod 11 and the nut 13, pressure is generated in the oil cylinder 15, hydraulic oil enters the lower piston cavity 222 through the oil way 23, and the piston 22 is pushed to move downwards to squeeze the packing rubber 26 to set the packer. When the circuit board 201 controls the motor 5 to rotate reversely, the screw rod 11 and the nut 13 drive the plunger 14 to move upwards, so that the pressure in the oil cylinder 15 is reduced, hydraulic oil in the lower piston cavity 222 flows back to the oil cylinder 15 through the oil way 23, and the piston 22 moves upwards to retract the packing rubber 26 to release the packing packer.
Further, a magnetic steel 601 and a hall element 602 for detecting the compression stroke of the packing rubber 26 are arranged at the output end of the electric telescopic device.
Specifically, the magnetic steel 601 is fixed to the coupling 6 of the electric telescopic device, the hall element 602 is fixed to the motor joint 34, and the number of rotations of the screw 11 is counted by detecting a signal of the magnetic steel 601 through the hall element 602. One side of the bearing seat 8 is provided with a limit switch 10, and the other side of the bearing seat 8 is provided with an upper sealing plug 9. The limit switch 10 can detect the initial positions of the nut 13 and the plunger 14, the magnetic steel 601 and the Hall element 602 can test and count the rotation turns of the screw rod 11 to determine the telescopic distance of the plunger 14, and the compression stroke of the packing rubber 26 can be determined through the telescopic distance of the plunger 14.
Further, an anti-rotation head 33 is provided at the lower end of the plunger 14, a steel ball 18 and an anti-rotation groove 19 are sequentially provided between the anti-rotation head 33 and the oil cylinder 15, the steel ball 18 is embedded in the periphery of the anti-rotation head 33, the anti-rotation groove 19 is provided on the anti-rotation head 33 at the lower end of the steel ball 18, and the plunger 14, together with the steel ball 18, and the fixed anti-rotation groove 19 can move axially to prevent radial rotation of the nut 13 and the plunger 14.
Specifically, the lower end of the oil cylinder 15 is further connected with an oil cylinder sealing head 17 through threads, the oil cylinder sealing head 17 compresses the anti-rotation groove 19 in the oil cylinder 15, the anti-rotation head 33 is in threaded connection with the plunger 14, the steel ball 18 is placed in a ball socket of the anti-rotation head 33, and the steel ball 18 can slide in a groove of the anti-rotation groove 19 when the plunger 14 moves axially so as to prevent the plunger 14 from rotating radially in the oil cylinder 15. The plunger 14, when moved back to the starting position, activates the limit switch 10. The flower pipe 16 and the oil cylinder 15 are connected together through the first spiral ring 32, and the flower pipe 16 is simultaneously connected with the adapter 20 in a threaded manner.
Further, the lower extreme of packing element 26 is provided with outer joint 30 down, the center tube 25 endotheca in the packing element 26 is equipped with the oil return bottle 27, and the upper end of oil return bottle 27 link up behind relief valve 24 and the oil circuit 23 in proper order and communicate with hydro-cylinder 15, forms center tube runner 161 between the inner periphery of center tube 25 and the periphery of hydro-cylinder 15, relief valve 24 and oil return bottle 27, and the lower extreme nest of oil return bottle 27 is in outer joint 30 down, and the lower extreme of oil return bottle 27 is provided with down nipple 31, down nipple 31 ring cover is in outer joint 30 down.
Specifically, the pressure release valve 24 is nested in a central tube 25 at the upper end of the oil return bottle 27, the upper end of the pressure release valve 24 is communicated with the oil cylinder 15 after penetrating through the oil cylinder sealing head 17 through an oil way 23, and the central tube 25 penetrates through the whole packer. The upper end of the lower outer joint 30 is provided with an adapter sleeve 37, the adapter sleeve 37 is in a step shape, one end of the adapter sleeve 37 is nested in the lower outer joint 30, and the other end of the adapter sleeve 37 is nested in the lower end of the packing rubber 26 to sleeve the oil return bottle 27. The lower end of the packing element 26 abuts against the step surface of the adapter sleeve 37. Fluid in the center tube flow passage 161 may enter the annulus between the outer sheath 1 and the lead screw sheath 12 through the flowtube 16.
Further, the upper end of the motor protection tube 3 is provided with the single-core socket 4, the lower end of the lower inner joint 31 is further provided with a single-core plug 29, and the lower inner joint 31 and the single-core plug 29 are sleeved in the lower outer joint 30. The single core plug 29, the lower outer joint 30 and the lower inner joint 31 can be butted with the logging instrument and the oil pipe at the lower end, and the single core socket 4 can be butted with the logging instrument at the upper end. The single-core plug 29 and the single-core socket 4 realize electrical connection and communication with the outside. When the packing rubber 26 is replaced, only the outer joint 30 is required to be disassembled firstly, the rubber sleeve on the sealing plug 28 is required to be pulled out, and then the inner joint 31 and the adapter sleeve 37 are required to be disassembled, so that hydraulic oil in the oil cylinder 15, the oil way 23 and the piston 22 is not required to be replaced.
Further, a screw groove sleeve 35 is sleeved in the lower end of the adapter 20, a second spiral ring 36 is sleeved in the upper end of the adapter 20, and the screw groove sleeve 35 and the second spiral ring 36 are sleeved on the periphery of the central tube 25; the lower extreme periphery of crossover sub 20 is provided with safety screw 21, the tip of safety screw 21 is embedded in the screw groove cover 35, safety screw 21 can be sheared under the shearing action of crossover sub 20, and after safety screw 21 was sheared by crossover sub 20, crossover sub 20 then was slided to second spiro 36 department, and hydro-cylinder 15 then is moved upward and is opened relief valve 24.
Specifically, the screw groove sleeve 35 and the second spiral ring 36 are in threaded sleeve connection with the upper end of the central tube 25, the safety screw 21 is radially arranged on the periphery of the adapter 20 and in threaded connection with the adapter, and the safety screw 21 is clamped in a groove of the screw groove sleeve 35. When the motor 5 fails and can not unlock the packer, the safety oil drainage and pressure relief are needed, the lifting pipe column shears the safety screw 21 through the adapter 20, the oil cylinder 15 moves upwards to open the pressure relief valve 24, and the hydraulic oil in the lower piston cavity 222 flows back to the oil return bottle 27 through the oil way 23.
Further, a lower sealing plug 28 is arranged at the lower end of the oil return bottle 27, an upper sealing plug 9 is arranged on one side of the bearing seat 8, and the upper sealing plug 9 and the lower sealing plug 28 are connected with cables at the upper end and the lower end of the packer.
Specifically, the upper sealing plug 9 on one side of the bearing seat 8 is used for leading out the cable in the motor protection tube 3 to the annular space between the outer protection tube 1 and the motor protection tube 3, the cable passes through the annular space all the way down through the oil cylinder 15 and the waist-shaped hole on the end face of the oil return bottle 27, and is connected to the single-core plug 29 through the lower sealing plug 28 arranged at the lower end of the oil return bottle 27, so that the cable at the upper end and the lower end of the packer can be penetrated.
The packer of the invention is used when: when the plunger moves downwards, hydraulic oil in the oil cylinder 15 enters the lower piston cavity 222 through the oil way 23, and pushes the piston 22 to downwards squeeze the packing rubber 26, so that the packer is set; when the plunger moves upwards, the pressure in the oil cylinder 15 is reduced, hydraulic oil flows back to the oil cylinder 15 from the lower piston cavity 222 through the oil way 23, and the piston 22 upwards retracts the packing rubber 26, so that the packer is deblocked.
When the packer fails and can not be unsealed, the safety screw 21 is sheared by adopting the lifting force of 2-3 tons of lifting pipe column, the oil cylinder 15 moves down integrally, the pressure release valve 24 is opened, and the hydraulic oil in the lower piston cavity 222 flows back into the oil return bottle 27 through the lower side of the oil way 23. The oil return bottle 27 is sealed from the outside, and can smoothly relieve pressure in a high-pressure environment. Because of the atmospheric air in the piston upper chamber 221, when the packer is at ambient pressure, the piston 22 will be subjected to downward pressure and will be able to resist the equilibrium ambient pressure so that the packer will not add additional setting squeeze force in a high pressure environment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A repeatable electric setting and electric unsetting packer, characterized in that: the novel hydraulic oil cylinder comprises an outer protection tube (1), wherein a packing rubber cylinder (26) is arranged at the lower end of the outer protection tube (1), an electric telescopic device is arranged inside the upper end of the outer protection tube (1), a piston (22) and an oil cylinder (15) are sequentially arranged inside the lower end of the outer protection tube (1), one end of the piston (22) is adjacent to the packing rubber cylinder (26), the other end of the piston (22) is communicated with the oil cylinder (15), a plunger (14) is arranged at the end part of the electric telescopic device, and one end of the plunger (14) stretches into the oil cylinder (15); the electric telescopic device drives the plunger (14) to move towards the lower end of the outer protection tube (1) so that hydraulic oil in the oil cylinder (15) enters a piston cavity of the piston (22) to push the piston (22) to move forwards to squeeze the packing rubber cylinder (26), the packer is set, the electric telescopic device drives the plunger (14) to move towards the upper end of the outer protection tube (1) so that the pressure in the oil cylinder (15) is reduced, the hydraulic oil in the piston cavity flows back to the oil cylinder (15) to enable the piston (22) to move backwards so that the packing rubber cylinder (26) is retracted and released, and the packer is unsealed.
2. A repeatable electric setting and unsetting packer according to claim 1, wherein: the lower extreme cover of electric telescopic device is equipped with lead screw pillar (12), the lower extreme nestification of lead screw pillar (12) hydro-cylinder (15), the lower extreme of outer pillar (1) is provided with crossover sub (20), hydro-cylinder (15) pass the lower extreme cover of crossover sub (20) establish piston (22), the lower extreme setting of piston (22) seal packing element (26), seal packing element (26) endotheca is equipped with center tube (25), the upper end of center tube (25) is provided with relief valve (24), the upper end of relief valve (24) is provided with oil circuit (23), oil circuit (23) link up relief valve (24) and hydro-cylinder (15).
3. A repeatable electric setting and unsetting packer according to claim 2, characterized in that: the piston (22) comprises an upper piston and a lower piston which are sleeved up and down, a sleeved part of the upper piston and the lower piston forms a piston cavity, the piston cavity comprises a piston upper cavity (221) and a piston lower cavity (222), the piston upper cavity (221) is used as an air cavity to resist balanced environment pressure, and the piston lower cavity (222) is used as a hydraulic oil cavity to push the packing rubber cylinder (26) to squeeze.
4. A repeatable electric setting and unsetting packer according to claim 3, wherein: the anti-rotation device is characterized in that an anti-rotation head (33) is arranged at the lower end of the plunger (14), a steel ball (18) and an anti-rotation groove (19) are arranged between the anti-rotation head (33) and the oil cylinder (15), the steel ball (18) is embedded in the periphery of the anti-rotation head (33), the anti-rotation groove (19) is formed in the anti-rotation head (33) at the lower end of the steel ball (18), and the plunger (14), the steel ball (18) and the anti-rotation groove (19) move coaxially to prevent the plunger (14) from rotating radially.
5. The repeatable electric setting and unsetting packer of claim 4, wherein: the lower end of the packing rubber cylinder (26) is provided with a lower outer joint (30), an oil return bottle (27) is sleeved in the central tube (25), the upper end of the oil return bottle (27) is communicated with the oil cylinder (15) after penetrating through the pressure relief valve (24) and the oil way (23), and a central tube flow channel (161) is formed between the inner periphery of the central tube (25) and the outer periphery of the oil cylinder (15), the pressure relief valve (24) and the oil return bottle (27); the lower end of the oil return bottle (27) is nested in the lower outer joint (30), the lower end of the oil return bottle (27) is provided with a lower inner joint (31), and the lower inner joint (31) is sleeved in the lower outer joint (30) in a ring mode.
6. The repeatable electric setting and unsetting packer of claim 5, wherein: a screw groove sleeve (35) is sleeved in the lower end of the adapter (20), a second spiral ring (36) is sleeved in the upper end of the adapter (20), and the screw groove sleeve (35) and the second spiral ring (36) are sleeved on the periphery of the central tube (25); the lower extreme periphery of crossover sub (20) is provided with safety screw (21), the tip embedding of safety screw (21) is cut after the shearing force of crossover sub (20) in screw groove cover (35), crossover sub (20) slide to second spiral ring (36), hydro-cylinder (15) then moves upwards and opens relief valve (24).
7. The repeatable electric setting and unsetting packer of claim 6, wherein: and the output end of the electric telescopic device is provided with magnetic steel (601) and a Hall element (602) for detecting the compression stroke of the packing rubber (26).
8. The repeatable electric setting and unsetting packer of claim 7, wherein: the motor protection tube (3) is sleeved outside the electric telescopic device, a bearing seat (8) is arranged at the lower end of the motor protection tube (3) and is connected with the screw protection tube (12), a single-core socket (4) is arranged at the upper end of the motor protection tube (3), a single-core plug (29) is further arranged at the lower end of the lower inner connector (31), and the lower inner connector (31) and the single-core plug (29) are sleeved in the lower outer connector (30) in a ring mode.
9. The repeatable electric setting and unsetting packer of claim 8, wherein: the electric telescopic device further comprises a motor (5), a screw rod (11) is connected to the motor (5), and one end of the screw rod (11) is connected with the plunger (14) through a nut (13).
10. The repeatable electric setting and unsetting packer of claim 9, wherein: the lower extreme of oil return bottle (27) is provided with sealing plug (28) down simultaneously, one side of bearing frame (8) is provided with sealing plug (9), the cable at packer upper and lower both ends is connected to sealing plug (9) and sealing plug (28) down.
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| CN202311586148.3A CN117287142B (en) | 2023-11-27 | 2023-11-27 | Packer capable of repeating electric setting and electric deblocking |
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| CN202311586148.3A CN117287142B (en) | 2023-11-27 | 2023-11-27 | Packer capable of repeating electric setting and electric deblocking |
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| CN117287142B CN117287142B (en) | 2024-03-12 |
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