CN117927179B - Compression packer capable of repeating wellhead pressurization setting and electric deblocking - Google Patents
Compression packer capable of repeating wellhead pressurization setting and electric deblocking Download PDFInfo
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- CN117927179B CN117927179B CN202410330112.7A CN202410330112A CN117927179B CN 117927179 B CN117927179 B CN 117927179B CN 202410330112 A CN202410330112 A CN 202410330112A CN 117927179 B CN117927179 B CN 117927179B
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- 230000006835 compression Effects 0.000 title claims abstract description 29
- 238000007906 compression Methods 0.000 title claims abstract description 29
- 238000007789 sealing Methods 0.000 claims description 79
- 230000001681 protective effect Effects 0.000 claims description 21
- 230000000149 penetrating effect Effects 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 7
- 238000012856 packing Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
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Abstract
The invention relates to a compression packer capable of repeating wellhead pressurization setting and electric deblocking, which comprises a middle end connector, wherein an upper outer protection pipe and a lower outer protection pipe are respectively arranged at the upper end and the lower end of the middle end connector, an upper central pipe is sleeved in a clearance ring between the upper outer protection pipe and the middle end connector, an electric reciprocating device is arranged in a clearance between the upper outer protection pipe and the upper central pipe, an overpressure channel is eccentrically arranged at the upper end of the middle end connector in the axial direction, a pressure inlet is eccentrically arranged at the lower end of the middle end connector, an overpressure hole is radially arranged at the middle end connector, a lower central pipe is sleeved in the clearance ring of the lower outer protection pipe, a rubber sleeve sleeved on the lower central pipe is arranged at the lower end of the lower outer protection pipe, the upper end of the lower central pipe extends into the middle end connector to be communicated with the upper central pipe, a piston is sleeved in the clearance between the lower outer protection pipe and the lower central pipe, the lower end of the piston is adjacent to the rubber sleeve, the upper end of the piston is communicated with the pressure inlet, and a piston rod of the electric reciprocating device extends into the overpressure channel. The invention realizes one-time well descending, multiple setting and unsetting of the packer by the extension of the electric reciprocating device.
Description
Technical Field
The invention belongs to the technical field of petroleum underground power packing tools, and particularly relates to a compression packer capable of repeating wellhead pressurization setting and electric deblocking.
Background
The packer is a commonly used downhole tool, is commonly used for downhole layering test, water finding and water plugging operation, and mainly depends on mechanical force or water pressure difference as power to expand a rubber cylinder so as to seal an oil sleeve annulus. When the existing packer is set, a pump truck is adopted for pressurization at a wellhead, after the packer is lowered to a design position, hydraulic pressure is added from an oil pipe, the piston is pushed by the hydraulic pressure to compress the packing element to seal an oil sleeve annulus, and after pressure relief, a locking mechanism is locked to prevent the packing element from rebounding. When in deblocking, the central tube is lifted up by means of mechanical force and then is sheared and deblocked with the pipe column together, the locking mechanism is destroyed, the packing piece is released, the pipe column is lifted up again, the slips are separated from the sleeve, and the packer is completely deblocked. Because the deblocking shear pin is sheared in the deblocking process, the locking mechanism is damaged, the rebound of the packing piece cannot be prevented, repeated setting cannot be finally carried out, and the next setting needs to be carried out again.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a compression packer capable of repeating wellhead pressurization setting and electric deblocking, which is pressurized by a wellhead, and realizes the setting and deblocking of the packer by expanding and moving plugging and releasing pressure through an electric reciprocating device, so as to realize one-time well descending, multiple setting and deblocking of the packer.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A compression packer capable of repeating wellhead pressurization setting and electric unsetting, which is characterized in that: the electric reciprocating device is arranged in a gap between the upper outer protecting pipe and the upper central pipe, an overpressure channel is eccentrically arranged at the upper end of the middle end connector, and a pressure inlet penetrating through the lower end face and the overpressure channel is eccentrically arranged at the lower end of the middle end connector; the middle end connector is radially provided with an overpressure hole penetrating through the overpressure channel and the upper central tube; the lower central tube is sleeved with the inner gap ring of the lower outer protective tube, the lower end of the lower outer protective tube is provided with a rubber sleeve sleeved with the lower central tube, and the upper end of the lower central tube extends into the middle end connector to be communicated with the upper central tube; a piston is sleeved in the gap between the lower outer protective tube and the lower central tube, the lower end of the piston is adjacent to the rubber cylinder, and the upper end of the piston is communicated with the pressure inlet; the end part of the piston rod of the electric reciprocating device extends into the overpressure channel and is used for switching on and off the overpressure hole and the pressure inlet hole.
Further, a piston rod sealing head is sleeved in the overpressure channel, piston rod holes penetrating through two ends of the piston rod sealing head are axially formed in the piston rod sealing head, pressure guide holes penetrating through the overpressure holes are radially formed in the piston rod sealing head, and the end portions of the piston rods extend into the piston rod holes to move in an up-down telescopic mode to be used for closing or conducting the overpressure holes and the pressure inlet holes.
Further, a locating pin is eccentrically arranged on the middle-end connecting head at the lower end of the piston rod sealing head, and the locating pin is inserted into the bottom of the piston rod sealing head and used for limiting the radial rotation of the piston rod sealing head.
Further, the piston is provided with an upper cavity and a lower cavity, an upper cavity is formed between the outer peripheral surface of the upper end part of the piston and the outer peripheral surface of the lower central tube, a lower cavity is formed between the outer peripheral surface of the lower end part of the piston and the inner peripheral surface of the lower outer protective tube, and the pressure inlet is communicated with the upper cavity.
Further, a sealing groove is formed in the periphery of the piston rod sealing head, and a first sealing ring is arranged in the sealing groove; the axial of piston rod is provided with the pressure release hole that link up its both ends, the pressure release hole is used for balancing the pressure at piston rod both ends.
Further, a lower joint sleeved on the lower central tube is arranged at the lower end of the rubber cylinder, and a lower wire passing hole is eccentrically arranged in the axial direction of the lower joint; the upper end of the middle-end connector is provided with a middle wire through hole in an axial eccentric manner; the upper end of the upper outer protective tube is provided with an upper joint sleeved on the periphery of the upper central tube, an upper wire passing hole penetrating through the upper end and the lower end of the upper joint is eccentrically arranged in the axial direction of the upper joint, and the lower end of the upper wire passing hole is communicated with a gap between the upper outer protective tube and the upper central tube; the upper end of the electric reciprocating device is provided with a motor wire passing hole; the cable is led out from the upper wire passing hole and is connected with the electric reciprocating device through the motor wire passing hole, and the cable is connected with the lower end of the packer through the middle wire passing hole, the interlayer and the lower wire passing hole.
Further, the electric reciprocating device further comprises an outer motor protection tube, a motor and a screw rod, wherein the motor is sleeved in the outer motor protection tube, and the outer motor protection tube is arranged in a gap between the upper outer protection tube and the upper central tube; the output of motor connects the one end of lead screw, the piston rod is connected to the other end of lead screw, the upper end of the outer pillar of motor is provided with the motor sealing plug that is used for the cable to wear to establish.
Further, a lower sealing plug is arranged at the lower end of the lower wire passing hole, a middle sealing plug is arranged at the upper end of the middle wire passing hole, and an upper sealing plug is arranged at the upper end of the upper wire passing hole; the cable is sequentially arranged in the upper sealing plug, the motor sealing plug, the middle sealing plug and the lower sealing plug in a penetrating mode.
Further, the upper end of the rubber cylinder is provided with an upper sealing ring, the lower end of the rubber cylinder is provided with a lower sealing ring, the lower end of the lower sealing ring is provided with a lower central pipe joint connected with the lower central pipe, and the periphery of the lower central pipe joint is sleeved with an adjusting spiral ring for adjusting the stroke of the rubber cylinder.
Further, an upper joint spiral ring is sleeved on the periphery of the lower end part of the upper joint, a lower joint spiral ring is sleeved on the periphery of the upper end part of the lower joint, the upper joint spiral ring is connected with the upper joint and the upper outer protection tube, and the lower joint spiral ring is connected with the lower joint and the lower central tube joint.
By adopting the technical scheme, the invention has the following advantages and effects:
(1) The invention provides a compression packer capable of repeating wellhead pressurization setting and electric deblocking, which is characterized in that a wellhead pressurization mode is adopted to generate pressure, and a piston is pushed to move forward by a overpressure hole and a pressure inlet hole to push a piston to squeeze a rubber cylinder to set the packer; after the setting is finished, the electric reciprocating device pushes the piston rod to move forwards to close the pressure inlet hole, so that the internal pressure of the piston is ensured to be stable, and the packer is stably set; when the packer is unpacked, the piston rod of the electric reciprocating device retreats to open the pressure inlet hole, so that the pressure in the piston is released, the packing element unpacks the packer, the packer is unpacked by one-time well descending and multiple setting, and multiple setting and unpacking can be realized without a high-power motor.
(2) According to the packer capable of repeating wellhead pressurization setting and electric deblocking, the upper central pipe and the lower central pipe are internally provided with the central liquid passage, so that the packer can be used in series with other logging instruments, and the piston rod is in a setting state and goes down the well, so that the phenomenon of midway setting can be effectively avoided; and the electric reciprocating device adopts a screw nut feeding structure, the current of a motor is not more than 100mA, a large torque speed reducer and a large thrust screw are avoided, the space of a mechanical mechanism is reduced, and the stroke of a piston rod can be controlled through a stroke switch and a stroke block.
(3) The packer capable of repeating wellhead pressurization setting and electric deblocking provided by the invention only needs to control the piston rod of the electric reciprocating device to retreat to open the pressure inlet hole to release the pressure in the piston when the packer needs to be moved or the well flushing operation is carried out, and the packer can be moved after deblocking.
Drawings
FIG. 1 is a schematic diagram of a first cross-sectional configuration of a repeatable wellhead pressurization setting and electrical unsetting compression packer of the present invention.
FIG. 2 is a schematic diagram of a second cross-sectional configuration of a repeatable wellhead compression set and electrically unset compression packer according to the present invention.
Fig. 3 is a state diagram of the initial state piston rod position of the present invention.
Fig. 4 is a state diagram of the piston rod position in the set state of the present invention.
The reference numerals are as follows:
1-upper joint; 2-upper center tube; 3-an upper outer sheath; 4-an electric reciprocator; 5-a control circuit board; 6-a piston rod seal head; 7-a middle end connector; 8-locating pins; 9-a first lower center tube; 10-a second lower central tube; 11-a piston; 12-a lower outer sheath; 13-an upper sealing ring; 14-a rubber cylinder; 15-a rubber cylinder retainer ring; 16-a lower seal ring; 17-modulating a spiro ring; 18-lower center tube joint; 19-lower joint; 101-upper sealing plug; 102-an upper linker spiro ring; 111-upper cavity; 112-lower cavity; 191-lower linker spiro ring; 192-lower sealing plug; 401-motor sealing plug; 402-motor outer protective tube; 403-an electric motor; 404-connecting screws; 405-stroke bracket; 406-a coupling; 407-screw; 408-a travel block; 409-set screw; 410-a micro switch; 411-steel washers; 412-a first tetrafluoro gasket; 413-thrust bearings; 414-gasket cover; 415-a second tetrafluoro gasket; 416-a lead screw outer protective tube; 417-cylindrical pins; 418-a piston rod; 601-a first seal groove; 602-a second seal groove; 701-middle sealing plug.
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.
As shown in fig. 1-4. The invention provides a compression packer capable of repeating wellhead pressurization setting and electric deblocking, which comprises a middle end connector 7, wherein an upper outer protection pipe 3 and a lower outer protection pipe 12 are respectively arranged at the upper end and the lower end of the middle end connector 7, an upper central pipe 2 is sleeved in a gap ring between the upper outer protection pipe 3 and the middle end connector 7, an electric reciprocating device 4 is arranged in a gap between the upper outer protection pipe 3 and the upper central pipe 2, an overpressure channel is arranged at the upper end of the middle end connector 7 in an axial eccentric manner, a pressure inlet penetrating through the lower end face and the overpressure channel is arranged at the lower end of the middle end connector 7 in an axial eccentric manner, and an overpressure hole penetrating through the overpressure channel and the upper central pipe 2 is arranged at the radial direction of the middle end connector 7. The lower central tube is sleeved in the gap ring in the lower outer protective tube 12, the lower end of the lower outer protective tube 12 is provided with a rubber cylinder 14 sleeved on the lower central tube, and the upper end of the lower central tube extends into the middle end connector 7 to be communicated with the upper central tube 2. A piston 11 is sleeved in the gap between the lower outer protective tube 12 and the lower central tube, the lower end of the piston 11 is adjacent to the rubber cylinder 14, and the upper end of the piston 11 is communicated with the pressure inlet. The end of the piston rod 418 of the electric shuttle 4 extends into the overpressure channel for switching the overpressure opening and the pressure inlet.
Specifically, an annular gap is formed between the upper outer protective tube 3 and the upper central tube 2, one side of the annular gap is provided with a control circuit board 5, the other side of the annular gap is provided with an electric reciprocating device 4, and the control circuit board 5 is electrically connected with the electric reciprocating device 4 and used for controlling the action of the electric reciprocating device 4.
The middle end connector 7 is an annular sleeve, and two ends of the periphery are stepped. The upper outer protective tube 3 is sleeved on the periphery of the upper end of the middle end connector 7 and is in threaded connection with the middle end connector, the lower end of the upper central tube 2 is inserted into the middle end connector 7, and the lower outer protective tube 12 is sleeved on the periphery of the lower end of the middle end connector 7 and is in threaded connection with the lower end connector. The outer circumference of the upper outer sheath 3, the outer circumference of the lower outer sheath 12 and the outer circumference of the middle connector 7 are identical.
The upper end of the cylinder wall at one side of the middle end connector 7 is axially provided with an overpressure channel, the upper end of the overpressure channel is communicated with the annular gap, and the inner diameter of the overpressure channel is larger than that of the overpressure hole. The lower end of the cylinder wall at one side of the middle end connector 7 is radially provided with an overpressure hole, the overpressure hole is radially inclined, and two ends of the overpressure hole penetrate through the cylinder wall of the middle end connector 7 and then are communicated with the upper central tube 2 and the overpressure channel.
In the initial installation state, the lower end of the piston rod 418 is positioned at the upper end of the overpressure hole, the overpressure hole and the pressure inlet hole are opened, pressure is generated in a wellhead pressurization mode, and the pressure passes through the upper central tube 2 and enters the piston 11 through the overpressure hole and the pressure inlet hole to push the piston to move forward to squeeze the rubber cylinder 14, so as to set the packer. After the setting is finished, the electric reciprocating device 4 pushes the piston rod 418 to move forwards to close the pressure inlet hole, so that the internal pressure stability of the piston 11 is ensured, and the packer is stably set.
When the packer needs to be unpacked, the electric reciprocating device 4 drives the piston rod 418 to retract, the pressure inlet hole is opened, the internal pressure of the piston 11 is released, and the packing element 14 is used for unpacking the packer.
Further, in order to facilitate the axial up-and-down movement of the piston rod 418 to close or conduct the pressure inlet and the pressure outlet, a piston rod seal head 6 is sleeved in the pressure outlet, the piston rod seal head 6 is nested in the bottom of the pressure outlet, the piston rod seal head 6 is axially provided with piston rod holes penetrating through two ends of the piston rod seal head, the piston rod seal head 6 is radially provided with pressure guide holes penetrating through the pressure outlet, two radial ends of the pressure guide holes are respectively conducted with the piston rod holes and the pressure outlet, and the lower end of the piston rod holes is axially conducted with the pressure inlet. As the piston rod 418 moves up and down within the piston rod bore,
The end of the piston rod 418 extends into the piston rod bore to move up and down to close or open the pilot hole to close or conduct the overpressure and inlet holes.
Further, a locating pin 8 is eccentrically arranged on a middle end connector 7 at the lower end of the piston rod sealing head 6, and the locating pin 8 is inserted into the bottom of the piston rod sealing head 6 to limit the radial rotation of the piston rod sealing head 6. The positioning pin 8 can ensure that the pressure guide hole and the overpressure hole are radially concentric, and the dislocation phenomenon does not occur to influence the radial mutual conduction of the pressure guide hole and the overpressure hole.
Further, the piston 11 has an upper cavity 111 and a lower cavity 112, the upper cavity 111 is formed between the outer peripheral surface of the upper end portion of the piston 11 and the outer peripheral surface of the lower center tube, the lower cavity 112 is formed between the outer peripheral surface of the lower end portion of the piston 11 and the inner peripheral surface of the lower outer tube 12, and the pressure inlet hole communicates with the upper cavity 111.
Specifically, the piston 11 includes a stepped collar, which is nested between the lower central tube and the lower outer sheath 12 at the lower end of the middle connector 7, the outer circumferential surface of the upper end of the collar is bonded to the inner circumferential surface of the lower outer sheath 12, the inner circumferential surface of the lower end of the collar is bonded to the outer circumferential surface of the lower central tube, an annular gap is formed between the inner circumferential surface of the upper end of the collar and the outer circumferential surface of the lower central tube to form an upper cavity 111, and the lower end of the pressure inlet hole is communicated with the upper cavity 111. An annular gap is formed between the outer peripheral surface of the lower end part of the annular sleeve and the inner peripheral surface of the lower outer protection tube 12 to form a lower cavity 112, and the lower cavity 112 is of a closed structure. Because the lower cavity 112 is not provided with a corresponding seal, the lower cavity 112 is directly connected with an oil jacket, and further the balanced pressure difference of the upper cavity 111 and the lower cavity 112 of the piston 11 in the pit is realized, and the pressure pressurized by a wellhead enters the upper cavity 111 and slides through the pressure difference between the upper cavity 111 and the lower cavity 112 to squeeze the rubber cylinder 14.
Further, the periphery of piston rod head 6 has seted up the seal groove, is provided with the first sealing washer rather than matching in the seal groove, and seal groove and first sealing washer are used for sealed piston rod head 6. The radial periphery at piston rod head 6 is seted up to the seal groove, and the seal groove includes first seal groove 601 and second seal groove 602, and interval setting about first seal groove 601 and the second seal groove 602 all overlaps in first seal groove 601 and the second seal groove 602 and establishes first sealing washer.
Further, the axial direction of the piston rod 418 is provided with a pressure relief hole penetrating through two ends of the piston rod 418, and the pressure relief hole can guide high-pressure liquid in the upper cavity 111 into a low-pressure area at the other end of the piston rod 418 for balancing the pressure at two ends of the piston rod 418 so as to reduce the bearing of larger liquid pressure when the piston rod 418 reciprocates. Because the two sides of the piston rod 418 are in the balanced pressure state, the piston rod 418 can be prevented from bearing larger axial force when the packer is set and unset, the working power of the electric reciprocating device 4 is reduced, and the electric reciprocating device 4 can realize multiple setting and unset without a high-power motor.
Further, a lower joint 19 of a ring sleeve lower central tube is arranged at the lower end of the rubber cylinder 14, and a lower wire passing hole is eccentrically arranged in the axial direction of the lower joint 19. The upper end of the middle end connector 7 is provided with a middle wire passing hole in an axial eccentric way. The upper end of the upper outer protective tube 3 is provided with an upper joint 1 sleeved on the periphery of the upper central tube 2, an upper wire passing hole penetrating through the upper end and the lower end of the upper joint 1 is eccentrically arranged in the axial direction, and the lower end of the upper wire passing hole is communicated with the gap between the upper outer protective tube 3 and the upper central tube 2. The upper end of the electric reciprocating device 4 is provided with a motor wire passing hole, an interlayer for a cable to pass through is arranged in the axial direction of the lower central tube, and the cable is led out from the upper wire passing hole and is connected with the electric reciprocating device 4 through the motor wire passing hole and is connected with the cable at the lower end of the packer through the middle wire passing hole, the interlayer and the lower wire passing hole.
Specifically, the center of the lower joint 19 is provided with a lower through hole, and a lower central tube is sleeved in the lower through hole. The outer wall of the lower joint 19 is axially provided with a lower wire through hole, the lower wire through hole penetrates through the upper end face and the lower end face of the outer wall of the lower joint 19, and the upper end of the lower wire through hole is communicated with the lower end of the interlayer. The outer wall of the middle end connector 7 is provided with a middle wire through hole, the middle wire through hole axially penetrates through the upper end face and the lower end face of the outer wall of the middle end connector 7, the upper end of the middle wire through hole is communicated with a gap between the upper central tube 2 and the upper outer protection tube 3, and the lower end of the middle wire through hole is communicated with the upper end of the interlayer. An upper through hole is formed in the center of the upper joint 1, an upper central pipe 2 is sleeved at the lower end of the upper through hole, and the outer peripheral surface of the upper joint 1 is nested at the inner periphery of an upper outer protection pipe 3 and is in threaded connection with the upper outer protection pipe. An upper wire through hole is axially formed in the outer wall of the upper joint 1, and penetrates through the upper end face and the lower end face of the outer wall of the upper joint 1.
The lower central tube is composed of a first lower central tube 9 and a second lower central tube 10, an inner ring and an outer ring are sleeved, an interlayer through which a cable passes is sleeved between the first lower central tube 9 and the second lower central tube 10, the upper end of the first lower central tube 9 extends out of the end part of the second lower central tube 10 and then extends into the middle end connector 7, and the lower end of the first lower central tube 9 extends out of the end part of the second lower central tube 10 and then extends into the lower connector 19.
Further, the electric reciprocating apparatus 4 further includes a motor outer protection tube 402, a motor 403, and a screw 407, the motor 403 is sleeved in the motor outer protection tube 402, and the motor outer protection tube 402 is disposed in a gap between the upper outer protection tube 3 and the upper central tube 2. The output of motor 403 connects the one end of lead screw 407, and the piston rod 418 is connected to the other end of lead screw 407, and the upper end of motor outer protection tube 402 is provided with the motor sealing plug 401 that is used for the cable to wear to establish.
Specifically, the motor 403 of the electric reciprocator 4 drives the screw 407 to drive the piston rod 418 to move telescopically. The motor 403 is electrically connected with the control circuit board 5 and is supplied with power by the control circuit board 5 to the motor 403, and meanwhile, the voltage and current of the motor 403 are collected through the control circuit board 5. The lower end of the motor outer protection tube 402 is sleeved with a motor 403, the upper end of the motor outer protection tube is provided with a motor wire passing hole, the motor wire passing hole is provided with a motor sealing plug 401, and a cable for a motor lead wire is connected with the motor 403 through the motor sealing plug 401 after passing through the motor wire passing hole.
The output end of the motor 403 is connected with one end of a screw rod 407 through a coupler 406, the screw rod 407 is sleeved with a screw rod outer protection pipe 416, a step surface arranged on the screw rod 407 is sleeved with a thrust bearing 413, and the thrust bearing 413 is used for bearing larger axial force born by the screw rod 407 when the pressure inlet hole is opened and closed. The upper end of thrust bearing 413 is provided with steel washer 411 and first tetrafluoro washer 412 respectively, installs the second sealing washer between steel washer 411 and the first tetrafluoro washer 412, and steel washer 411, first tetrafluoro washer 412 and second sealing washer are used for sealed guarantee thrust bearing 413 and control circuit board 5 not receive the influence of fluid in the pit. The lower end of the thrust bearing 413 is provided with a gasket cover 414 and a second tetrafluoro gasket 415, respectively, the gasket cover 414 and the second tetrafluoro gasket 415 providing secondary sealing protection for the control circuit board 5.
The lower end of the motor 403 is fixed with a stroke bracket 405 through a connecting screw 404, a stroke block 408 and a micro switch 410 are arranged on the stroke bracket 405, and the stroke position of a piston rod 418 is adjusted through the stroke block 408 so that the piston rod 418 reaches a specified position and then the motor 403 is closed. The travel block 408 is mounted on a travel nut of the screw 407 by a set screw 409, the travel nut is located between two micro-switches 410, the micro-switches 410 are mounted on the travel bracket 405 by pan head screws, and the two micro-switches 410 control the start and stop of the motor 403 respectively. When the screw rod 407 rotates, the stroke block 408 is driven to move, and after the stroke block 408 touches the corresponding micro switch 410, the micro switch 410 controls the motor 403 to start or close, so as to control the telescopic movement position of the piston rod 418.
The radial direction of the motor outer protection tube 402 is provided with a cylindrical pin 417, a U-shaped groove is formed in the piston rod 418, and the cylindrical pin 417 is embedded into the U-shaped groove and moves coaxially with the piston rod 418 to prevent the radial rotation of the piston rod 418.
Further, a lower sealing plug 192 is provided at the lower end of the lower via hole, a middle sealing plug 701 is provided at the upper end of the middle via hole, and an upper sealing plug 101 is provided at the upper end of the upper via hole. The cables pass through the upper sealing plug 101, the motor sealing plug 401, the middle sealing plug 701 and the lower sealing plug 192 respectively to realize sealing. The upper sealing plug 101 is inserted in the upper end of the upper wire passing hole and used for sealing an upper end cable, the middle sealing plug 701 is inserted in the upper end of the middle wire passing hole and used for sealing a middle cable, the lower sealing plug 192 is inserted in the lower end of the lower wire passing hole and used for sealing a lower end cable, and the motor sealing plug 401 is inserted in the motor wire passing hole and used for sealing a motor lead cable.
Further, an upper sealing ring 13 is arranged at the upper end of the rubber cylinder 14, a lower sealing ring 16 is arranged at the lower end of the rubber cylinder 14, a lower center pipe joint 18 connected with a lower center pipe is arranged at the lower end of the lower sealing ring 16, and an adjusting spiral ring 17 for adjusting the stroke of the rubber cylinder 14 is sleeved on the periphery of the lower center pipe joint 18.
Specifically, the inner part Zhou Jun and the outer part Zhou Jun of the lower center pipe joint 18 are in a stepped cylindrical shape, the lower end periphery of the second lower center pipe 10 is connected with the lower center pipe joint 18, and the lower joint 19 is nested on the periphery of the first lower center pipe 9 and is in threaded connection with the inner periphery of the lower center pipe joint 18. The upper end of the lower center pipe joint 18 supports the inner edge portion of the lower seal ring 16, an adjusting screw ring 17 is screwed on the outer periphery of the upper end of the lower center pipe joint 18, the upper end face of the adjusting screw ring 17 supports the lower end face of the lower seal ring 16, and the adjusting screw ring 17 is located on the outer periphery stepped face of the lower center pipe joint 18. The rubber cylinder 14 is separated by the rubber cylinder retainer ring 15, and the upper sealing ring 13 and the lower sealing ring 16 at the two ends of the rubber cylinder 14 can prevent leakage after the sealing pressure difference between the inner ring of the rubber cylinder 14 and the lower central tube is increased after the rubber cylinder 14 is compressed and expanded. After plastic deformation is generated after the rubber cylinder 14 is used for a plurality of times, the adjusting spiral ring 17 on the lower center pipe joint 18 is rotated, so that the distance between the adjusting spiral ring 17 and the lower center pipe joint 18 is changed, and the compression stroke of the rubber cylinder 14 is adjusted.
Further, an upper joint spiral ring 102 is sleeved on the outer periphery of the lower end part of the upper joint 1, a lower joint spiral ring 191 is sleeved on the outer periphery of the upper end part of the lower joint 19, the upper joint spiral ring 102 is connected with the upper joint 1 and the upper outer protection tube 3, and the lower joint spiral ring 191 is connected with the lower joint 19 and the lower central tube joint 18.
Specifically, in the connection process of the upper connector 1, the upper outer protective tube 3, the lower connector 19 and the lower center pipe joint 18, the upper connector spiral ring 102 and the lower connector spiral ring 191 are used for tensioning, so that the upper connector 1 and the lower connector 19 only axially translate and do not radially rotate when being connected, the cable is ensured not to twist in the connection process, and the normal operation of the cable is ensured.
The packer of the invention is used when: the piston rod 418 is firstly put into a well in a setting state, the phenomenon of midway setting caused by underground pressure is avoided, when the packer reaches a place needing to be set, the electric reciprocating device 4 drives the piston rod 418 to retract, the pressure inlet hole is opened, pressure is generated in a wellhead pressurizing mode, the pressure enters the piston 11 through the pressure inlet hole to push the piston to move forward to squeeze the rubber cylinder 14, the packer is set, after setting is completed, the electric reciprocating device 4 pushes the piston rod 418 to move forward to close the pressure inlet hole, and then the pressure stability inside the piston 11 is guaranteed, and stable setting of the packer is realized. During deblocking, the electric reciprocating device 4 drives the piston rod 418 to retract back again, opens the pressure inlet hole, and then releases the pressure in the piston 11, so as to realize deblocking of the packer by the rubber cylinder 14.
Claims (9)
1. A compression packer capable of repeating wellhead pressurization setting and electric unsetting, which is characterized in that: the novel high-pressure pipe comprises a middle-end connector (7), wherein an upper outer protection pipe (3) and a lower outer protection pipe (12) are respectively arranged at the upper end and the lower end of the middle-end connector (7), an upper central pipe (2) is sleeved in an inner gap ring of the upper outer protection pipe (3) and the middle-end connector (7), an electric reciprocating device (4) is arranged in a gap between the upper outer protection pipe (3) and the upper central pipe (2), an overpressure channel is eccentrically arranged at the upper end of the middle-end connector (7), and a pressure inlet hole penetrating through the lower end face and the overpressure channel is eccentrically arranged at the lower end of the middle-end connector; the radial direction of the middle end connector (7) is provided with an overpressure hole penetrating through the overpressure channel and the upper central tube (2); the lower central tube is sleeved in the inner gap ring of the lower outer protective tube (12), the lower end of the lower outer protective tube (12) is provided with a rubber cylinder (14) sleeved with the lower central tube, and the upper end of the lower central tube extends into the middle end connector (7) to be communicated with the upper central tube (2); a piston (11) is sleeved in a gap between the lower outer protection tube (12) and the lower central tube, the lower end of the piston (11) is adjacent to the rubber cylinder (14), the upper end of the piston (11) is communicated with the pressure inlet, the piston (11) is provided with an upper cavity (111) and a lower cavity (112), an upper cavity (111) is formed between the outer peripheral surface of the upper end part of the piston (11) and the outer peripheral surface of the lower central tube, a lower cavity (112) is formed between the outer peripheral surface of the lower end part of the piston (11) and the inner peripheral surface of the lower outer protection tube (12), and the pressure inlet is communicated with the upper cavity (111); the end part of a piston rod (418) of the electric reciprocating device (4) extends into the overpressure channel to be used for switching on and off the overpressure hole and the pressure inlet hole.
2. The repeatable wellhead compression set and electrically unset compression packer of claim 1, wherein: the inner sleeve of the overpressure channel is provided with a piston rod sealing head (6), the axial direction of the piston rod sealing head (6) is provided with a piston rod hole penetrating through two ends of the piston rod sealing head, the radial direction of the piston rod sealing head (6) is provided with a pressure guide hole penetrating through the overpressure hole, and the end part of the piston rod (418) extends into the piston rod hole to move up and down in a telescopic manner to be used for closing or conducting the overpressure hole and the pressure inlet hole.
3. The repeatable wellhead compression set and electrically unset compression packer of claim 2, wherein: the middle end connector (7) at the lower end of the piston rod sealing head (6) is eccentrically provided with a locating pin (8), and the locating pin (8) is inserted into the bottom of the piston rod sealing head (6) and used for limiting the radial rotation of the piston rod sealing head (6).
4. A repeatable wellhead compression set and electrically unset compression packer according to claim 3, characterised in that: the periphery of the piston rod seal head (6) is provided with a seal groove, and a first seal ring is arranged in the seal groove; the axial direction of piston rod (418) is provided with the relief hole that link up its both ends, the relief hole is used for balancing the pressure at piston rod (418) both ends.
5. The repeatable wellhead compression set and electrically unset compression packer of claim 4, wherein: the lower end of the rubber cylinder (14) is provided with a lower joint (19) sleeved on the lower central tube, and a lower wire passing hole is eccentrically arranged in the axial direction of the lower joint (19); the upper end of the middle end connector (7) is provided with a middle wire passing hole in an axial eccentric way; an upper joint (1) sleeved on the periphery of the upper central tube (2) is arranged at the upper end of the upper outer protective tube (3), an upper wire passing hole penetrating through the upper end and the lower end of the upper joint (1) is eccentrically arranged in the axial direction, and the lower end of the upper wire passing hole is communicated with a gap between the upper outer protective tube (3) and the upper central tube (2); the upper end of the electric reciprocating device (4) is provided with a motor wire passing hole; the cable is led out from the upper wire passing hole and is connected with an electric reciprocating device (4) through the motor wire passing hole and a lower end cable connected with the packer through the middle wire passing hole, the interlayer and the lower wire passing hole.
6. The repeatable wellhead compression set and electrically unset compression packer of claim 5, wherein: the electric reciprocating device (4) further comprises a motor outer protection tube (402), a motor (403) and a screw rod (407), wherein the motor (403) is sleeved in the motor outer protection tube (402), and the motor outer protection tube (402) is arranged in a gap between the upper outer protection tube (3) and the upper central tube (2); the output end of the motor (403) is connected with one end of a screw rod (407), the other end of the screw rod (407) is connected with a piston rod (418), and the upper end of the motor outer protection tube (402) is provided with a motor sealing plug (401) for a cable to penetrate.
7. The repeatable wellhead compression set and electrically unset compression packer of claim 6, wherein: a lower sealing plug (192) is arranged at the lower end of the lower wire passing hole, a middle sealing plug (701) is arranged at the upper end of the middle wire passing hole, and an upper sealing plug (101) is arranged at the upper end of the upper wire passing hole; the cable is sequentially arranged in the upper sealing plug (101), the motor sealing plug (401), the middle sealing plug (701) and the lower sealing plug (192) in a penetrating mode.
8. The repeatable wellhead compression set and electrically unset compression packer of claim 7, wherein: the upper end of the rubber cylinder (14) is provided with an upper sealing ring (13), the lower end of the rubber cylinder (14) is provided with a lower sealing ring (16), the lower end of the lower sealing ring (16) is provided with a lower center pipe joint (18) connected with the lower center pipe, and the periphery of the lower center pipe joint (18) is sleeved with an adjusting spiral ring (17) for adjusting the stroke of the rubber cylinder (14).
9. The repeatable wellhead compression set and electrically unset compression packer of claim 8, wherein: the upper connector is characterized in that an upper connector spiral ring (102) is sleeved on the periphery of the lower end part of the upper connector (1), a lower connector spiral ring (191) is sleeved on the periphery of the upper end part of the lower connector (19), the upper connector spiral ring (102) is connected with the upper connector (1) and the upper outer protection tube (3), and the lower connector spiral ring (191) is connected with the lower connector (19) and the lower center tube joint (18).
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| CN202410330112.7A CN117927179B (en) | 2024-03-22 | 2024-03-22 | Compression packer capable of repeating wellhead pressurization setting and electric deblocking |
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| CN117927179A (en) | 2024-04-26 |
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