WO2025001271A1 - 可重复丢手回接封隔器及其操作方法 - Google Patents

可重复丢手回接封隔器及其操作方法 Download PDF

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Publication number
WO2025001271A1
WO2025001271A1 PCT/CN2024/079903 CN2024079903W WO2025001271A1 WO 2025001271 A1 WO2025001271 A1 WO 2025001271A1 CN 2024079903 W CN2024079903 W CN 2024079903W WO 2025001271 A1 WO2025001271 A1 WO 2025001271A1
Authority
WO
WIPO (PCT)
Prior art keywords
tie
locking
packer
repeatable
hole
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.)
Ceased
Application number
PCT/CN2024/079903
Other languages
English (en)
French (fr)
Inventor
苏敏文
晏健
李铭
田文超
樊兴安
隆世明
廖作杰
张文
李景彬
李星星
宫娜娜
王伟鹏
侯俊耀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
Original Assignee
China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China National Petroleum Corp, CNPC Chuanqing Drilling Engineering Co Ltd filed Critical China National Petroleum Corp
Publication of WO2025001271A1 publication Critical patent/WO2025001271A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B33/127—Packers; Plugs with inflatable sleeve
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
    • E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure

Definitions

  • the invention relates to the field of downhole tools in oil fields, and in particular to a repeatable drop-out tie-back packer and an operating method thereof.
  • double-seal single-cage tool is widely used in layered fracturing and production operations as a mature tool technology.
  • the distance between the upper and lower packers in the same pipe string fracturing construction is fixed and cannot be adjusted.
  • it is necessary to frequently pull out the drill to adjust the distance between the two packers which has low construction efficiency.
  • Chinese invention patent CN114458235A discloses a mechanical reusable bridge plug, which includes a central component, an upper anchoring component, a rubber cylinder sealing upper and lower cone components, a lower friction anchoring component, a repeated sliding locking component and a salvage setting component.
  • the salvage setting component includes a salvage tool upper connector, a recovery sleeve and a guide shoe.
  • the salvage tool upper connector is threadedly connected to the recovery sleeve and further fixed by an anti-rotation nail.
  • the side wall of the recovery sleeve is processed with an installation groove, an inclined groove and a recovery groove.
  • the upper end of the bridge plug upper joint is connected to an insertion tube, and the upper part of the insertion tube is radially provided with a raised pin. The raised pin switches in the installation groove, the inclined groove and the recovery groove to complete the hand-off or docking.
  • the mechanically reusable bridge plug of this design can complete the release or docking by rotating the upper joint of the bridge plug so that the raised pin can switch in the installation groove, the inclined groove, and the recovery groove.
  • this method of achieving release or docking by rotating the upper joint of the bridge plug is prone to operational errors that may cause the upper joint of the bridge plug to accidentally detach from the insertion tube, posing a safety risk.
  • the present invention provides a repeatable release and connection packer and an operating method thereof.
  • the present invention provides a repeatable drop-and-tie packer, comprising:
  • the central mechanism comprises a central tube, wherein a first hole and a second hole communicating with a cavity of the central tube are provided on a side wall at one end of the central tube;
  • a sealing locking mechanism part of which extends into the interior of the central tube, and the sealing locking mechanism is configured to be movable between an unsealing position and a sealing locking position, so that the sealing locking mechanism can connect or separate the first hole and the second hole from the cavity of the central tube;
  • the drop-and-go reconnection mechanism comprises a reconnection locking claw with a locking hook which is clamped and connected to one end of the sealing locking mechanism extending out of the central tube, and a support member which can limit the inward movement of the reconnection locking claw, wherein the support member is configured to be able to support the inner side of the reconnection locking claw or to allow the reconnection locking claw to detach from the support member.
  • the sealing and locking mechanism includes a joint, a limiting assembly, and a core shaft connected to the joint, wherein part of the core shaft extends into the interior of the center tube, and the joint can drive the core shaft to move between an unsealing position and a sealing and locking position, so that the core shaft connects or separates the first hole and the second hole from the cavity of the center tube, and the limiting assembly is configured to limit or release the limit on the core shaft in the sealing and locking position.
  • the limiting component includes:
  • a second limiting groove disposed on the outer periphery of the mandrel.
  • the mandrel locking claw is arranged on the inner wall of the central tube and is configured as follows:
  • the core shaft locking claw is engaged with the second limiting groove.
  • an opening communicating with the cavity of the central tube is provided in the middle of the core shaft, a check valve is provided in the opening, a bypass hole communicating with the opening is provided on the side wall of the central tube, and the configuration is as follows:
  • the bypass hole is opposite to the second hole, and the first hole is connected to the cavity of the central tube;
  • the bypass hole and the second hole are opposite to each other, and the core shaft blocks the end of the central tube to separate the first hole from the cavity of the central tube.
  • a sealing packing is provided at the outer periphery of the end of the core shaft, and a core shaft valve seat is provided on the inner wall of the central tube.
  • the sealing packing fits with the inner wall of the core shaft valve seat to form a seal.
  • the drop-and-go reconnection mechanism includes a support cylinder, a cylinder body sleeved on the outer periphery of the support cylinder, and a limiting cylinder arranged between the cylinder body and the support cylinder, the reconnection locking claw is arranged at the end of the limiting cylinder, the support member includes a control valve seat arranged at the end of the support cylinder, the limiting cylinder is configured to be able to move along its axial direction so that the locking hook can be supported on the outer periphery of the control valve seat or detached from the control valve seat, and a first limiting groove matching the locking hook is provided inside the joint, and the length of the first limiting groove is greater than the length of the locking hook of the reconnection locking claw.
  • the repeatable drop-back packer also includes an anchoring structure, which is arranged on the periphery of the central pipe and includes an anchoring member and a seating locking member, wherein the anchoring member is configured to be supported on the inner wall of the sleeve, or to be separated from the sleeve, and the seating locking member is configured to maintain the state of the anchoring member when the anchoring member is supported on the inner wall of the sleeve.
  • the anchoring member includes a first anchoring member body, which includes a seat body arranged on the outer periphery of the central tube, the seat body is provided with a plurality of mounting holes, a positioning anchor claw is provided inside the mounting hole, the positioning anchor claw is connected to the bottom wall of the mounting hole by an anchor claw reset spring, a first pressurizing hole is provided at a position of the seat body corresponding to the mounting hole, and the seat body is provided with a cover plate for pressing the positioning anchor claw.
  • a first anchoring member body which includes a seat body arranged on the outer periphery of the central tube, the seat body is provided with a plurality of mounting holes, a positioning anchor claw is provided inside the mounting hole, the positioning anchor claw is connected to the bottom wall of the mounting hole by an anchor claw reset spring, a first pressurizing hole is provided at a position of the seat body corresponding to the mounting hole, and the seat body is provided with a cover plate for pressing the positioning anchor claw.
  • the anchoring member also includes a second anchoring member body, which includes a bushing sleeved on the outer periphery of the central tube and an upper rubber cylinder seat, a lower rubber cylinder seat and a rubber cylinder slidably sleeved on the outer periphery of the bushing, the upper rubber cylinder seat and the bushing are respectively connected to the seat body, and the rubber cylinder is arranged between the upper rubber cylinder seat and the lower rubber cylinder seat.
  • a second anchoring member body which includes a bushing sleeved on the outer periphery of the central tube and an upper rubber cylinder seat, a lower rubber cylinder seat and a rubber cylinder slidably sleeved on the outer periphery of the bushing, the upper rubber cylinder seat and the bushing are respectively connected to the seat body, and the rubber cylinder is arranged between the upper rubber cylinder seat and the lower rubber cylinder seat.
  • the anchoring member also includes a third anchoring member body, which includes an upper cone, a lower cone and a cava arranged on the outer periphery of the central tube, the upper cone is connected to the lower rubber cylinder seat, and a protective cover is provided on the outer periphery of the upper cone and the lower cone, an opening is provided at a position of the protective cover corresponding to the cava, and a first return spring is provided between the protective cover and the cava.
  • a third anchoring member body which includes an upper cone, a lower cone and a cava arranged on the outer periphery of the central tube, the upper cone is connected to the lower rubber cylinder seat, and a protective cover is provided on the outer periphery of the upper cone and the lower cone, an opening is provided at a position of the protective cover corresponding to the cava, and a first return spring is provided between the protective cover and the cava.
  • the seating and locking member comprises:
  • a rubber cylinder locking claw is connected to the bushing, and the rubber cylinder locking claw is slidably matched with the inner wall of the upper cone;
  • the annular locking block is arranged on the inner wall of the upper cone and is configured as follows:
  • the rubber cylinder locking claw When the rubber cylinder is in a compressed state, the rubber cylinder locking claw is engaged with the annular locking block to maintain the compressed state of the rubber cylinder.
  • the third anchoring member body further includes a locking spring, and the locking spring is arranged between the protective sleeve and the lower rubber cylinder seat.
  • the seating and locking component also includes a slip ring, which is arranged on the outer periphery of the central tube, and the inner side of the slip ring is provided with a second slope surface matching the first slope surface of the rubber cylinder locking claw, so that when the rubber cylinder locking claw moves relative to the slip ring, the rubber cylinder locking claw can be retracted inward to disengage from the annular locking block.
  • the repeatable drop-and-tie packer further comprises a track switching mechanism, and the track switching mechanism comprises:
  • a track pipe is connected to the end of the central pipe away from the release and return mechanism, and the track pipe is provided with a plurality of sealing grooves and An unsealing groove, wherein a plurality of the setting grooves and the unsealing grooves form a J-shaped track, and the upper cone, the lower cone and the slips are arranged on the outer periphery of the track tube;
  • a switching ring is provided with a switching pin, wherein the switching ring and the switching pin are arranged in the J-shaped track and are configured as follows:
  • the switch ring When the track tube is lifted, the switch ring can rotate so that the switch pin can switch between the setting groove and the unsealing groove.
  • the repeatable drop-and-tie packer further comprises a straightening mechanism, wherein the straightening mechanism is sleeved on the outer circumference of the trajectory tube and frictionally matched with the inner wall of the sleeve.
  • the straightening mechanism comprises:
  • a righting base sleeved on the outer circumference of the track tube, the righting base being connected to the lower cone;
  • a plurality of straightening blocks are arranged on the straightening base at intervals along the circumferential direction of the central tube, and the straightening blocks extend out of the straightening base.
  • a compression spring is arranged between the straightening blocks and the straightening base.
  • the repeatable drop tie-back packer further comprises a reverse plugging valve mechanism, and the reverse plugging valve mechanism comprises:
  • a sheath connected to the end of the track tube
  • a lower connector connected to the sheath
  • a reverse blocking valve seat is arranged inside the sheath, and the reverse blocking valve seat abuts against the lower joint;
  • the valve disc is mounted on the valve seat of the reverse blocking valve through a torsion spring.
  • a lower connecting sleeve is provided on the outer periphery of the track tube, and two ends of the lower connecting sleeve are respectively connected to the straightening block base and the sleeve.
  • a second pressurizing hole is provided on the cylinder wall of the support cylinder, the limiting cylinder is configured to move in a direction away from the joint under a pressurized state, and a second return spring is provided between the limiting cylinder and the cylinder body.
  • the present invention also provides an operating method for a repeatable drop-and-tie packer, comprising the following steps:
  • the repeatable drop-and-tie packer is lowered into the well.
  • the drop-and-tie mechanism pushes the sealing locking mechanism downward, so that the sealing locking mechanism moves to the sealing locking position, isolating the cavity of the central pipe from the annulus between the packer and the casing;
  • the hand-dropping and reconnecting mechanism is lowered to connect the reconnecting locking claw with the sealing locking mechanism, and the supporting member is moved so that the supporting member is supported on the inner side of the reconnecting locking claw;
  • the tubing is lifted, and the drop-and-tie mechanism drives the sealing locking mechanism to move to the unsealing position.
  • the cavity of the central tube is connected with the first hole and the second hole, and the upper and lower pressures are balanced.
  • the tubing is continued to be lifted, and the central tube is separated from the sleeve. Then, the repeatable drop-and-tie packer is moved to the next working position by moving the tubing.
  • the release and tie-back mechanism When the packer provided by the present invention is in use, the release and tie-back mechanism is separated from the sealing locking mechanism to avoid affecting the normal use of the packer.
  • the release and tie-back mechanism can be connected to the sealing locking mechanism, so that the packer can be moved to the next working position under the drive of the release and tie-back mechanism, avoiding the problem of frequent drilling and improving construction efficiency.
  • the disassembly of the release and tie-back mechanism and the sealing locking mechanism of the present application requires active application of force toward the support member so that the support member can be separated from the inner side of the tie-back locking claw to prevent the release and tie-back mechanism from accidentally separating from the sealing locking mechanism, thereby ensuring the safety of construction.
  • the sealing locking mechanism can always separate the first hole and the second hole from the cavity of the center pipe, thereby separating the annulus between the packer and the casing from the cavity of the center pipe, thereby ensuring the normal use of the packer.
  • the double-sealed single-card fracturing method consisting of the upper and lower packers is more convenient than conventional ones by lifting and lowering the tubing string to seal the packer, and then lifting the tubing string to seal the upper packer.
  • the double-seal single-card fracturing string has the characteristic of no string connection between the upper and lower packers, so it can avoid string erosion between the packers, and thus avoid complex downhole problems such as interlayer oil pipe breakage and perforation failure.
  • FIG1 is a schematic structural diagram of a repeatable tie-back packer according to an embodiment of the present invention.
  • FIG2 is a schematic structural diagram of a portion of the repeatable drop-and-tie packer in a set state according to an embodiment of the present invention
  • FIG3 is a schematic structural diagram of the repeatable release tie-back packer after release according to an embodiment of the present invention.
  • FIG4 is a schematic structural diagram of the repeatable tie-back packer in the upper half of an embodiment of the present invention.
  • FIG5 is a schematic structural diagram of the repeatable tie-back packer in the lower half of the embodiment of the present invention.
  • FIG6 is a schematic structural diagram of a drop-and-reconnect mechanism according to an embodiment of the present invention.
  • FIG7 is a schematic structural diagram of a sealing locking mechanism according to an embodiment of the present invention.
  • FIG8 is a schematic structural diagram of the first anchoring member body according to an embodiment of the present invention.
  • FIG9 is a schematic structural diagram of the second anchoring member body according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of the third anchoring member body according to an embodiment of the present invention.
  • FIG11 is a schematic structural diagram of a righting mechanism according to an embodiment of the present invention.
  • FIG12 is a schematic structural diagram of a track switching mechanism according to an embodiment of the present invention.
  • FIG. 13 is an expanded view of a J-shaped track of the track switching mechanism according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of the reverse blocking valve mechanism according to an embodiment of the present invention.
  • Center mechanism 11. Center tube; 111. Mandrel valve seat; 12. Upper connecting sleeve; 121. First hole; 122. Second hole; 2. Sealing locking mechanism; 21, joint; 211, first limiting groove; 212, guide groove; 22, limiting assembly; 221, second limiting groove; 222, mandrel locking claw; 23, mandrel; 231, opening; 232, check valve; 233, sealing packing; 234, valve plate; 235, bypass hole; 3, hand-off reconnection mechanism; 31, support cylinder; 311, control valve seat; 3111, sealing rubber sleeve; 32, Cylinder; 33, limit cylinder; 331, reconnection lock claw; 34, second reset spring; 35, upper joint; 36, spring seat; 37, guide shoe; 38, first sealing ring; 39, second sealing ring; 4, anchoring structure; 41, anchoring member; 411, first anchoring member body; 4111, seat body; 4112, positioning anchor claw; 4113, anchor claw reset spring; 4114, cover
  • Track switching mechanism 51. Track tube; 511. Sealing groove; 512. Unsealing groove; 52. Switching ring; 521. Switching pin; 6. Righting mechanism; 61. Righting base; 62. Righting block; 63. Compression spring; 64. Righting pressure ring; 7. Reverse blocking valve mechanism; 71. Sheath; 72. Lower joint; 73. Reverse blocking valve seat; 74. Valve disc; 75. Torsion spring; 8. Lower connecting sleeve.
  • the central mechanism 1 includes a central tube 11, and a first hole 121 and a second hole 122 communicating with the cavity of the central tube 11 are provided on the side wall of one end of the central tube 11.
  • an upper connecting sleeve 12 is provided at one end of the central tube 11, and the first hole 121 and the second hole 122 are provided on the side wall of the upper connecting sleeve 12.
  • the central tube 11 has a corresponding first end and a second end. Taking the direction shown in FIG. 2 as an example, the first end of the central tube 11 is the left end of the central tube 11, and the second end of the central tube 11 is the right end of the central tube 11.
  • the first end of the central tube 11 and the upper connecting sleeve 12 can be directly connected, or the first end of the central tube 11 and the upper connecting sleeve 12 can be indirectly connected by means of other mechanisms.
  • part of the sealing locking mechanism 2 extends into the interior of the central pipe 11, and the sealing locking mechanism 2 is configured to be movable between an unsealing position and a sealing locking position, so that the sealing locking mechanism 2 can connect or separate the first hole 121 and the second hole 122 from the cavity of the central pipe 11, and further separate the annulus between the packer and the casing from the cavity of the central pipe 11.
  • part of the sealing locking mechanism 2 extends into the interior of the upper connecting sleeve 12, and the sealing locking mechanism 2 can move with the hand-dropping and tie-back mechanism 3, so that the sealing locking mechanism 2 can move between the unsealing position and the sealing locking position under the drive of the hand-dropping and tie-back mechanism 3, and the sealing locking mechanism 2 can remain in the unsealing position and the sealing locking position.
  • the hand-off reconnection mechanism 3 has a reconnection locking claw 331 with a lock hook that is clamped and connected to one end of the sealing locking mechanism 2 extending from the central tube 11, and a support member that can limit the reconnection locking claw 331 from closing inward, and the support member is configured to be supported on the inner side of the reconnection locking claw 331 or to make the reconnection locking claw 331 detach from the support member.
  • the support member can actively move, and then can actively detach from the reconnection locking claw 331 or be supported inside the reconnection locking claw 331.
  • the release and tie-back mechanism 3 When the packer provided by the present invention is in use, the release and tie-back mechanism 3 is separated from the sealing locking mechanism 2 to avoid affecting the normal use of the packer. When it is necessary to adjust its own position, the release and tie-back mechanism 3 can be connected to the sealing locking mechanism 2, so that the packer can be moved to the next working position under the drive of the release and tie-back mechanism 3, avoiding the problem of frequent drilling and improving construction efficiency.
  • the disassembly of the release and tie-back mechanism 3 and the sealing locking mechanism 2 of the present application requires actively applying a force toward the support member so that the support member can be separated from the inner side of the tie-back locking claw 331, preventing the release and tie-back mechanism 3 from being accidentally separated from the sealing locking mechanism 2, and ensuring the safety of construction.
  • the packer when the packer is in use, it can be separated from the cavity of the center pipe by the annulus between the packer and the casing, ensuring the normal use of the packer.
  • the double-seal single-card fracturing method consisting of the upper and lower packers is characterized by no tubing connection between the upper and lower packers, by lifting and lowering the tubing string to set the packer, and at the same time releasing the packer, and then lifting the tubing string to set the upper packer. Therefore, it can avoid tubing erosion between the packers, and thus avoid complex downhole problems such as interlayer oil pipe breakage and perforation failure.
  • the sealing locking mechanism 2 includes a joint 21, a limiting assembly 22, and a mandrel 23 connected to the joint 21.
  • Part of the mandrel 23 extends into the interior of the central tube 11, specifically into the interior of the upper connecting sleeve 12.
  • the joint 21 can drive the mandrel 23 to move between the unsealing position and the sealing locking position, so that the mandrel 23 connects or separates the first hole 121 and the second hole 122 from the cavity of the central tube 11.
  • the limiting assembly 22 is configured to restrict or release the mandrel 23 in the sealing locking position.
  • One end of the mandrel 23 extends into the interior of the joint 21 and is threadedly connected to the joint 21 to increase the convenience of disassembly and assembly. At the same time, it can be further tightened by a stop screw to increase the firmness of the connection.
  • the other end of the mandrel 23 extends into the interior of the upper connecting sleeve 12, and the extending end of the mandrel 23 is provided with a step surface.
  • the upper connecting sleeve 12 is sleeved on the step surface of the mandrel 23 to prevent the mandrel 23 from detaching from the upper connecting sleeve 12.
  • the limiting assembly 22 includes a second limiting groove 221 disposed on the periphery of the spindle 23 and a spindle locking claw 222 disposed on the inner wall of the upper connecting sleeve 12, and the second limiting groove 221 matches the spindle locking claw 222.
  • the limit assembly 22 has a simple structure, and the separation or clamping process can be completed by only lifting or lowering the release and reconnection mechanism 3, which is easy to operate.
  • the middle part of the core shaft 23 is provided with an opening 231 connected to the cavity of the central tube 11, and a check valve 232 is provided in the opening 231 to provide one-way flow of the fluid.
  • a bypass hole 235 connected to the opening 231 is provided on the side wall of the central tube (11), and the bypass hole 235 is specifically provided on the side wall of the upper connecting sleeve 12.
  • the bypass hole 235 is opposite to the position of the second hole 122, and the core shaft 23 blocks the end of the central tube 11 to separate the first hole 121 from the cavity of the central tube 11.
  • the core shaft 23 under this design mode occupies less space, making the overall structure more compact. Furthermore, whether in a sealed state or an unsealed state, it can be ensured that the positions of the first hole 121 or the second hole 122 and the bypass hole 235 completely correspond to each other, so as to maximize the flow rate of the fluid and meet the design requirements.
  • a sealing packing 233 is provided at the outer periphery of the end of the mandrel 23, and a mandrel valve seat 111 is provided on the inner wall of the central tube 11.
  • the sealing packing 233 fits with the inner wall of the mandrel valve seat 111 to form a seal, thereby ensuring the tightness of the connection and the isolation effect.
  • the end of the mandrel 23 is threadedly connected with a packing lock cap, and the sealing packing 233 is sleeved on the outer periphery of the sealing packing 233 to increase the convenience of installing the sealing packing 233, and the sealing packing 233 can be pressed by screwing the packing lock cap to ensure the fixing effect of the sealing packing 233.
  • a conical hole is provided inside the packing lock cap, and the check valve 232 is installed at the position of the conical hole to support the check valve 232 through the slope of the conical hole.
  • the function of the check valve 232 is that after the sealing locking mechanism 2 is sealed and locked, it can prevent the upper liquid from entering the lower part of the packer through the check valve 232.
  • a valve plate 234 may be provided inside the opening 231 of the mandrel 23, and the valve plate 234 is supported on the inner wall of the mandrel 23 through the end of the packing lock cap to prevent the valve plate 234 from moving along the axial direction of the mandrel 23.
  • the valve plate 234 is used to fix the valve ball of the check valve 232 to limit the valve ball in the tapered hole of the packing lock cap.
  • the first hole 121 and the second hole 122 are two holes opened on the side wall of the connecting sleeve 12.
  • the first hole 121 corresponds to the bypass hole 235 on the core shaft 23, connecting the inside and the outside of the packer;
  • the sealing locking mechanism 2 is not locked, that is, the core shaft 23 is completely disengaged from the core shaft valve seat 111 described below, as shown in FIG7, the second hole 122 completely corresponds to the opening 231 on the shaft, connecting the inside and the outside of the packer.
  • the first hole 121 and the second hole 122 have the same function, both of which are channels for reverse circulation of the packer.
  • the two holes can ensure that no matter what working condition the core shaft 23 of the packer is in, one of the holes can be guaranteed to completely correspond to the bypass hole 235 on the core shaft 23, retaining the largest reverse circulation channel and minimizing the erosion of the core shaft 23 of the packer by the liquid.
  • the hand-off reconnection mechanism 3 includes a support cylinder 31, a cylinder body 32 sleeved on the outer periphery of the support cylinder 31, and a limiting cylinder 33 arranged between the cylinder body 32 and the support cylinder 31.
  • the end of the support cylinder 31 extends out of the cylinder body 32
  • a limiting ring is provided on the outer periphery of the support cylinder 31 to limit the movement range of the limiting cylinder 33 through the limiting ring to prevent the limiting cylinder 33 from extending out of the cylinder body 32.
  • the reconnecting locking claw 331 is arranged at the end of the limiting cylinder 33, and the locking hook is arranged on the outer side of the end of the reconnecting locking claw 331.
  • the support member includes a control valve seat 311 arranged at the end of the supporting cylinder 31, and the diameter of the control valve seat 311 is larger than the diameter of the supporting cylinder 31.
  • the limiting cylinder 33 is configured to be able to move along its axial direction so that the locking hook can be supported on the outer periphery of the control valve seat 311 or detach from the control valve seat 311.
  • the interior of the joint 21 is provided with a first limiting groove 211 matching the locking hook, and the length of the first limiting groove 211 is larger than the length of the locking hook of the reconnecting locking claw 331.
  • the lock hook of the reconnection lock claw 331 is supported on the outer side of the control valve seat 311 to prevent the reconnection lock claw 331 from being folded inward.
  • the limiting cylinder 33 When the locking hook needs to be inserted into the first limiting groove 211, the limiting cylinder 33 needs to be moved in the direction away from the control valve seat 311 so that the locking hook is separated from the control valve seat 311. At this time, the return locking claw 331 is inserted into the connector 21. The return locking claw 331 can be retracted under the pressure of the connector 21 until the locking hook is inserted into the first limiting groove 211. The return locking claw 331 is then expanded and the limiting cylinder 33 is reset so that the locking hook is supported on the outer periphery of the control valve seat 311 to avoid accidental unlocking of the return locking claw 331, thereby ensuring safety in use.
  • the lock hook can move in the first limiting groove 211.
  • the locking hook is moved to separate from the control valve seat 311 (the locking hook is always in the first limiting groove 211), and then the release and return mechanism 3 is lifted to separate the locking hook from the first limiting groove 211, completing the separation process of the release and return mechanism 3, which is convenient to operate.
  • the repeatable drop tieback packer further includes an anchoring structure 4, which is arranged on the periphery of the central pipe 11 and includes an anchoring member 41 and a seated locking member 42.
  • the anchoring member 41 is configured to be supported on the inner wall of the sleeve, or separated from the sleeve, and the seated locking member 42 is configured to maintain the state of the anchoring member 41 when the anchoring member 41 is supported on the inner wall of the sleeve.
  • the anchoring member 41 can be deployed by lowering the pipe string to support the inner wall of the sleeve.
  • the state of the anchoring member 41 can be maintained by the seated locking member 42 to ensure the support effect of the anchoring member 41.
  • the anchoring member 41 includes a first anchoring member body 411, the first anchoring member body 411 includes a seat body 4111 disposed on the outer periphery of the central pipe 11, a plurality of mounting holes are disposed on the seat body 4111, a positioning anchor claw 4112 is disposed inside the mounting hole, the positioning anchor claw 4112 is connected to the bottom wall of the mounting hole through an anchor claw reset spring 4113, a first pressurizing hole is disposed at a position of the seat body 4111 corresponding to the mounting hole, and a cover plate 4114 for pressing the positioning anchor claw 4112 is disposed on the seat body 4111.
  • the positioning anchor claw 4112 In the setting state, pressure can be applied to the inside of the mounting hole through the first pressurizing hole, at which time, the internal pressure of the positioning anchor claw 4112 is higher than the external pressure, that is, when the internal pressure of the packer is higher than the external pressure, the positioning anchor claw 4112 is activated, and the positioning anchor claw 4112 extends outward under the action of the internal and external pressure difference, and the positioning anchor claw 4112 is anchored on the inner wall of the casing.
  • the positioning fluke 4112 In the unsealed state, the positioning fluke 4112 can be reset under the action of the fluke reset spring 4113.
  • the mounting hole can be a blind hole, and the number of blind holes is 6, which are divided into two rows and symmetrically distributed along the circumferential direction of the central tube 11.
  • the positioning fluke 4112 and the outer arc surface of the seat body 4111 are designed with grooves, and a cover plate 4114 is installed on the groove to compress the positioning fluke 4112 and the fluke reset spring 4113, and the cover plate 4114 is fixed by tightening screws.
  • the end of the seat body 4111 extends out of the first end of the center tube 11, and the core shaft valve seat 111 is threadedly connected to the inner wall of the extended end of the seat body 4111, which increases the convenience of disassembly and assembly.
  • An O-ring of the core shaft valve seat 111 is provided between the core shaft valve seat 111 and the inner wall of the extended end of the seat body 4111 to ensure the tightness of the connection.
  • the upper connecting sleeve 12 is threadedly connected to the outer periphery of the extended end of the seat body 4111, and part of the core shaft locking claw 222 extends between the seat body 4111 and the upper connecting sleeve 12.
  • the upper connecting sleeve 12, part of the core shaft locking claw 222 and the extended end of the seat body 4111 are further tightened by anti-rotation screws to ensure the firmness of the connection.
  • the anchoring member 41 also includes a second anchoring member body 412, which includes a bushing 4121 sleeved on the outer periphery of the central pipe 11 and an upper rubber cylinder seat 4122, a lower rubber cylinder seat 4123 and a rubber cylinder 4124 slidably sleeved on the outer periphery of the bushing 4121.
  • the bushing 4121 is clearance-matched with the central pipe 11 to form a hydraulic channel connected to the first pressurized hole.
  • the hydraulic channel is connected to the lower part of the packer.
  • the lower pressure of the packer is generally higher than the upper pressure of the packer.
  • the internal pressure of the packer is introduced into the interior of the above-mentioned positioning anchor claw 4112.
  • the outside of the positioning anchor claw 4112 is located in the oil casing annulus on the upper part of the packer, causing the internal pressure of the positioning anchor claw 4112 to be higher than the external pressure.
  • the positioning anchor claw 4112 starts to extend to play the role of anchoring the pipe column.
  • the positioning anchor claw 4112 is a conventional technology in the field, and therefore, its working principle is not described in detail.
  • the third anchoring member body 413 described below is activated when the packer is set. After the third anchoring member body 413 is activated, it can ensure that the pipe string does not move up and down. After the third anchoring member body 413 is activated, if the lower pressure of the packer is higher than the upper pressure, the first anchoring member body 411 is activated to further ensure that the pipe string does not move up and down. If the lower pressure of the packer is not higher than the upper pressure, at this time, the first anchoring member body 411 will not be activated, and there will be no other impact on the pipe string.
  • the upper rubber cylinder seat 4122 and the bushing 4121 are connected to the seat body 4111 respectively, and the rubber cylinder 4124 is arranged between the upper rubber cylinder seat 4122 and the lower rubber cylinder seat 4123, and the two ends of the rubber cylinder 4124 are respectively in close contact with the upper rubber cylinder seat 4122 and the lower rubber cylinder seat 4123.
  • the pipe string when the pipe string is lowered, the pipe string pushes the upper rubber cylinder seat 4122 and the bushing 4121 to move through the sealing locking and the first anchoring member body 411.
  • the rubber cylinder 4124 can be compressed, the bushing 4121 moves relatively with the upper rubber cylinder seat 4122, the lower rubber cylinder seat 4123 and the rubber cylinder 4124. In this process, the rubber cylinder 4124 is compressed and expanded to support on the inner wall of the sleeve to play a positioning role.
  • a partition plate is provided at one end of the seat body 4111 facing the upper rubber cylinder seat 4122, and the bushing 4121 is arranged on the inner side of the partition plate.
  • the upper glue cylinder seat 4122 is wrapped around the outer side of the partition plate, and the upper glue cylinder seat 4122 is threadedly connected to the partition plate to increase the convenience of disassembly and assembly.
  • the inner ring of the upper glue cylinder seat 4122 extends out of the partition plate toward the inner side of the partition plate and is supported on the outer periphery of the bushing 4121.
  • a gap is formed between the outer periphery of the bushing 4121 and the inner wall of the partition plate.
  • An annular baffle is provided at the end of the bushing 4121. The annular baffle can slide in the gap and limit the movement range of the annular baffle through the inner ring of the upper glue cylinder seat 4122 to avoid excessive travel.
  • the anchoring member 41 further includes a third anchoring member body 413, which includes an upper cone 4131, a lower cone 4132, and a slip 4133 disposed on the periphery of the central tube 11.
  • the third anchoring member body 413 may be directly disposed on the periphery of the central tube 11, or the third anchoring member body 413 may be disposed on the periphery of the central tube 11 through other structures.
  • the upper cone 4131 is connected to the lower rubber cylinder seat 4123 so that the lower rubber cylinder seat 4123 can push the upper cone 4131 to move.
  • a protective sleeve is provided on the outer periphery of the upper cone 4131 and the lower cone 4132.
  • the protective sleeve is sleeved on the outer cross section of the upper cone 4131 so that the protective sleeve can drive the upper cone 4131 to move downward.
  • the protective sleeve is threadedly connected to the lower cone 4132.
  • An opening is provided at a position corresponding to the protective sleeve and the cava 4133.
  • a first return spring 4135 is provided between the protective sleeve and the cava 4133.
  • the slopes of the upper cone 4131 and the lower cone 4132 are arranged oppositely, and there are multiple slips 4133, which are installed on the outer peripheral surface of the support mechanism (the track tube 51 described below). Slopes are also arranged at the positions corresponding to the upper cone 4131 and the lower cone 4132, so that the contact surface between the slip 4133 and the upper cone 4131 and the lower cone 4132 is a slope.
  • a first return spring 4135 is arranged between the middle part of the slip 4133 and the protective sleeve, and the first return spring 4135 is always in a compressed state to prevent the slip 4133 from starting prematurely during the lowering of the packer.
  • the upper cone 4131 can be pushed to move by the lower rubber cylinder seat 4123, and the slip 4133 moves outward under the action of the slope to extend out of the opening, and the slip 4133 is supported on the inner wall of the sleeve to play a limiting effect.
  • the slip 4133 is retracted into the interior of the protective sleeve 4134 under the action of the first return spring 4135 to contact the limit position.
  • the upper cone 4131 is reset.
  • the third anchoring member body 413 further includes a locking spring 423, which is arranged between the protective sleeve 4134 and the lower rubber cylinder seat 4123, and the locking spring 423 is sleeved on the outer periphery of the upper cone 4131.
  • the lower cone 4132 moves upward to drive the protective sleeve 4134 to squeeze the locking spring 423, so when the third anchoring member body 413 is anchored, the locking spring 423 is always in a compressed state.
  • the tubing drives the upper cone 4131 upward, and at the same time, the locking spring 423 pushes the protective sleeve 4134 downward, and the protective sleeve 4134 drives the lower cone 4132 downward, so that the upper cone 4131 moves upward, the lower cone 4132 moves downward, and the slip 4133 returns to its original state under the action of the first reset spring 4135, and the anchoring state is released.
  • the anchoring member 41 of the present application includes a first anchoring member body 411, a second anchoring member body 412 and a third anchoring member body 413, which are distributed at the upper and lower positions of the repeatable release tieback packer, so that the repeatable release tieback packer is evenly stressed to ensure the setting effect of the repeatable release tieback packer and ensure that the packer is subjected to downward and upward pressure during use. That is, after the packer is set, the rubber cylinder 4124 seals the annulus between the pipe string and the casing, and the core shaft 23 inside the packer seals the internal annulus of the pipe string, so a barrier can be formed after the packer is set to prevent the upper and lower parts of the packer from being connected.
  • the locking member 42 includes a rubber cylinder locking claw 421 and an annular locking block 422.
  • the rubber cylinder locking claw 421 is connected to the bushing 4121, and the rubber cylinder locking claw 421 is slidably matched with the inner wall of the upper cone 4131.
  • the annular locking block 422 is disposed on the inner wall of the upper cone 4131.
  • the end of the rubber cartridge locking claw 421 is connected to the outer circumference of the end of the bushing 4121 by threads to increase the convenience of disassembly and assembly.
  • the inner wall of the lower rubber cartridge seat 4123 is processed with double steps to accommodate the end of the rubber cartridge locking claw 421 and the end of the upper cone 4131 respectively, making the structure more compact.
  • the locking hook of the rubber cartridge locking claw 421 faces outward and can slide relative to the inner wall of the upper cone 4131.
  • the end of the locking hook of the rubber cartridge locking claw 421 is provided with a slope surface.
  • the rubber cylinder locking claw 421 and the annular locking block 422 can cooperate to prevent the rubber cylinder 4124 from being reset, thereby ensuring the anchoring effect of the rubber cylinder 4124 and thus ensuring safe construction.
  • the seating locking component 42 also includes a slip ring 424, which is arranged on the outer periphery of the center tube 11, and the inner side of the slip ring 424 is provided with a second slope surface matching the first slope surface of the rubber cylinder locking claw 421, so that during the movement of the rubber cylinder locking claw 421 relative to the slip ring 424, the rubber cylinder locking claw 421 can be retracted inward to disengage from the annular locking block 422.
  • the pipe column is lifted up. Due to the clamping connection between the rubber cylinder locking claw 421 and the annular locking block 422, the slip ring 424 on the central pipe 11 has an upward movement tendency, thereby pushing the rubber cylinder locking claw 421 inward through the cooperation of the first slope surface and the second slope surface, so that the rubber cylinder locking claw 421 and the annular locking block 422 are actively unlocked, thereby reducing the damage caused by the hard contact between the rubber cylinder locking claw 421 and the annular locking block 422, and ensuring the service life of the rubber cylinder locking claw 421 and the annular locking block 422.
  • the annular space between the outside of the pipe column and the inside of the casing of the present invention is sealed by the rubber tube 4124, and the inside of the packer is sealed by the core shaft 23, with reliable sealing performance.
  • the inner and outer seals are locked by the limit assembly 22 and the locking member 42 respectively, which can ensure that the inner and outer seals of the packer will not be unlocked and failed in the middle of the sealing process due to unexpected circumstances. That is, after the inner and outer seals are formed, the role of the packer here is equivalent to a bridge plug after the hand is set, which isolates the lower well section, and the upper well section isolated by the packer can be constructed.
  • the repeatable release and tie-back packer of the present application further includes a track switching mechanism 5, which includes a track tube 51 and a switching ring 52.
  • the track tube 51 is threadedly connected to the end of the center tube 11 away from the release and tie-back mechanism 3 to increase the convenience of disassembly and assembly.
  • the track tube 51 is provided with a plurality of setting grooves 511 and unsealing grooves 512, wherein the length of the setting groove 511 is greater than the length of the unsealing groove 512, and the plurality of setting grooves 511 and unsealing grooves 512 form a J-shaped track.
  • a switching pin 521 is provided on the switching ring 52, wherein the switching ring 52 has two symmetrically distributed through holes processed along the radial direction, there are two switching pins 521, and the two switching pins 521 are respectively arranged in the two through holes, the switching ring 52 and the switching pin 521 are arranged in a J-shaped track, and when the track tube 51 is lifted, the switching ring 52 can rotate so that the switching pin 521 can switch between the sealing groove 511 and the unsealing groove 512.
  • the repeatable release tie-back packer of the present application further includes a straightening mechanism 6, which is sleeved on the outer periphery of the track tube 51, and the straightening mechanism 6 is frictionally matched with the inner wall of the sleeve.
  • the straightening mechanism 6 is used to ensure that the packer is in a straightened state in the wellbore, and at the same time, it can provide a certain friction force for the packer to prevent the packer from being lowered too fast.
  • the straightening mechanism 6 includes a straightening base 61 and a plurality of straightening blocks 62.
  • the straightening base 61 is sleeved on the outer circumference of the track tube 51, and the straightening base 61 is threadedly connected to the lower cone 4132.
  • a plurality of straightening blocks 62 are arranged on the straightening base 61 at intervals along the circumferential direction of the center tube 11, and the straightening blocks 62 extend out of the straightening base 61.
  • a compression spring 63 is provided between the straightening block 62 and the straightening base 61, so that the straightening block 62 is pushed out of the straightening base 61 by the compression spring 63.
  • the straightening block 62 is always in an extended state with the support of the preload force provided by the compression spring 63, so that the straightening block 62 can be supported on the inner wall of the sleeve.
  • a plurality of blind holes are provided on the straightening block 62, and part of the compression spring 63 is in the blind hole, so that the compression spring 63 is limited by the blind hole, and the compression direction of the compression spring 63 can be limited.
  • the elastic force of the compression spring 63 can be designed according to actual needs.
  • the straightening mechanism 6 also includes a straightening pressure ring 64, which is sleeved on the outer periphery of the track tube 51, and the end of the straightening pressure ring 64 is threadedly connected to the straightening base 61, and the end of the straightening pressure ring 64 extends into the straightening base 61, so that the end of the straightening pressure ring 64 can be pressed on one side edge of the straightening block 62, and a pressure plate is provided at a position of the straightening base 61 corresponding to the other side edge of the straightening block 62, and correspondingly, bosses are respectively provided at both ends of the straightening block 62, and the two bosses are respectively in contact with the end of the straightening pressure ring 64 and the pressure plate to ensure the limiting effect of the straightening block 62, prevent the straightening block 62 from being separated from the straightening base 61, and the compression spring 63 is in a compressed state in the
  • the repeatable releasable tie-back packer of the present application further includes a reverse plugging valve mechanism 7, which includes a sheath 71, a lower joint 72, a reverse plugging valve seat 73 and a valve flap 74.
  • the sheath 71 is connected to the end of the track pipe 51.
  • the lower joint 72 The reverse blocking valve seat 73 is arranged inside the sheath 71 , and the reverse blocking valve seat 73 abuts against the lower joint 72 .
  • the valve flap 74 is mounted on the reverse blocking valve seat 73 through a torsion spring 75 .
  • the inner wall of the sleeve 71 is processed with a step surface
  • the reverse blocking valve seat 73 is installed in the sleeve 71
  • the upper end of the reverse blocking valve seat 73 contacts the step surface of the inner wall of the sleeve 71.
  • a reverse blocking valve O-ring is installed between the reverse blocking valve seat 73 and the sleeve 71 to ensure the tightness of the connection.
  • the lower end surface of the reverse blocking valve seat 73 contacts the upper end surface of the lower joint 72, and the lower joint 72 is threadedly connected to the sleeve 71.
  • the reverse blocking valve seat 73 is installed with a valve flap 74, and the reverse blocking valve seat 73 and the valve flap 74 are connected by a torsion spring 75.
  • valve flap 74 When in use, the valve flap 74 is generally in an open state under the spring force of the torsion spring 75. When the liquid pressure at the bottom of the packer is higher than the upper pressure, the valve flap 74 overcomes the spring force of the torsion spring 75 under the action of the pressure difference, and the valve flap 74 rotates 90° to contact the valve seat 73 to form a blocked state. At this time, the valve flap 74 of the reverse blocking valve mechanism 7 is subjected to the liquid force at the bottom of the packer, and the force is transmitted to the sleeve 71 connected thereto by the reverse blocking valve mechanism 7, and then continues to transmit the force to the lower cone 4132, further squeezing the cava 4133 to assist the third anchoring member body 413.
  • the outer periphery of the track tube 51 is provided with a lower connecting sleeve 8, and the two ends of the lower connecting sleeve 8 are respectively connected to the base of the straightening block 62 and the sleeve 71 to increase the firmness of the connection and the compactness of the structure.
  • one end of the lower connecting sleeve 8 is threadedly connected to the pressure ring of the straightening block 62, and the other end of the lower connecting sleeve 8 is threadedly connected to the sleeve 71.
  • the lower connecting sleeve 8 presses the end face of the switching ring 52 to ensure that the switching ring 52 moves along the J-shaped track.
  • a second pressurized hole is provided in the wall of the support cylinder 31 , the limiting cylinder 33 is configured to move in a direction away from the joint 21 under pressurized state, and a second return spring 34 is provided between the limiting cylinder 33 and the cylinder body 32 .
  • annular push plate is provided at the end of the limit tube 33 extending between the support tube 31 and the cylinder body 32, a first sealing ring 38 is provided between the annular push plate and the outer periphery of the support tube 31, and a second sealing ring 39 is provided on the side of the second pressurizing hole away from the first sealing ring 38, so that an injection space connected to the second pressurizing hole is formed between the first sealing ring 38 and the second sealing ring 39.
  • pressure When pressure is injected into the injection space, the pressure will push the annular push plate to move in a direction away from the joint 21, so that the reconnection locking claw 331 is separated from the control valve seat 311.
  • the injection pressure is stopped, and the reconnection locking claw 331 is reset under the action of the second reset spring 34.
  • the reconnection locking claw 331 of this design is separated from the control valve seat 311 by pressurization, avoiding misoperation and effectively ensuring the safety of construction.
  • the hand-off reconnection mechanism 3 of the present application also includes an upper joint 35 connected to the pipe column, the cylinder 32 is threadedly connected to the outer wall of the upper joint 35, the support cylinder 31 is threadedly connected to the inner wall of the upper joint 35, a spring seat 36 is installed in the annular space formed between the cylinder 32 and the support cylinder 31, the second return spring 34 and part of the reconnection claw 331 are in the annular space, and the second return spring 34 is connected to the spring seat 36.
  • the end of the cylinder 32 is threadedly connected with a guide shoe 37, and the guide shoe 37 is used to control the extension length of the reconnection claw 331.
  • the outer periphery of the control valve seat 311 is provided with a sealing rubber sleeve 3111 to increase the tightness of the connection between the control valve seat 311 and the joint 21.
  • sealing rings may be reasonably provided between components that require sealing, so as to ensure a sealed connection between the corresponding components.
  • the end of the connector 21 of the present application is provided with a guide groove 212, which is open, and the guide groove 212 is connected to the first limiting groove 211 through a transition groove.
  • the reconnection locking claw 331 is preferentially closed under the action of the guide groove 212, so that the lock hook of the reconnection locking claw 331 can be inserted into the first limiting groove 211, increasing the convenience of inserting the reconnection locking claw 331.
  • the side walls at both ends of the first limiting groove 211 are provided with slopes to facilitate the lock hook to detach from the first limiting groove 211.
  • the present invention also provides an operating method of the above-mentioned repeatable drop-and-tie packer, comprising the following steps:
  • Step S1 lowering a repeatable releasable tie-back packer into the well.
  • the releasable tie-back mechanism 3 pushes the sealing locking mechanism 2 downward, so that the sealing locking mechanism 2 moves to the sealing locking position, isolating the cavity of the central pipe 11 from the annulus between the packer and the casing.
  • the joint 21 of the packer pushes the mandrel 23 moves downward, the mandrel 23 contacts the mandrel valve seat 111 to form a seal, so as to separate the cavity of the central pipe 11 from the annulus between the packer and the casing.
  • the mandrel locking claw 222 is locked with the second limiting groove 221 on the mandrel 23, and the sealing locking mechanism 2 is activated.
  • Step S2 continue to lower the pipe string, when the pipe string is lowered to the preset position, the center pipe is supported on the inner wall of the sleeve.
  • the anchoring member 41 works, so that the anchoring member 41 is supported on the inner wall of the sleeve, and the anchoring member 41 is maintained in a state by locking the anchoring member 42.
  • the pipe string is continuously lowered, and the pipe string overcomes the friction between the straightening mechanism 6 and the inner wall of the sleeve and is lowered to the designed position.
  • the pipe string is lifted to switch the track switching mechanism 5 of the packer to the packer setting track (the switching pin 521 slides into the setting groove 511).
  • the pipe string is lowered.
  • the lower cone 4132 threadedly connected to the straightening mechanism 6 is fixed when the pipe string is lowered, and the upper part of the straightening mechanism 6 moves downward, that is, the upper cone 4131 moves downward, and the slip 4133 is squeezed out of the protective sleeve and anchored on the sleeve, and the anchoring mechanism function at the bottom is activated.
  • the pipe string continues to be lowered, the rubber cylinder 4124 is compressed to form a seal with the inner wall of the sleeve, the rubber cylinder locking claw 421 is engaged with the annular locking block 422, and the locking function of the setting lock component 42 is activated, and the packer is set.
  • the structural form of the setting lock component 42 has been described above and is not explained in detail here.
  • Step S3 move the support to release the restriction on the tie-back claw 331, move the tie-back mechanism 3 upward until the tie-back claw 331 is separated from the sealing locking mechanism 2, and the upper body pipe string, the tie-back mechanism 3 is separated from the sealing locking mechanism 2, and the tie-back packer can be repeatedly dropped to perform corresponding operations.
  • the liquid is pumped into the tubing column to exert pressure, and the limit cylinder 33 moves upward under the action of the liquid pressure.
  • a steel ball of suitable size is thrown into the tubing column, and the steel ball sits on the conical surface of the control valve seat 311, and the steel ball forms a seal with the control valve seat 311.
  • Pressure is pumped into the tubing column from the wellhead, and the pressure enters the injection pressure space through the channel in the support cylinder 31 and the second pressurized hole.
  • the resulting pressure difference pushes the reconnection claw 331 to move up, and pushes the support cylinder 31 to move down, so that the reconnection claw 331 is separated from the support cylinder 31, and the forced lock between the reconnection claw 331 and the joint 21 is released.
  • the internal pressure of the hand-release reconnection mechanism 3 pushes the reconnection claw 331 to move up, and the lock between the reconnection claw 331 and a limit groove is completely released.
  • the tubing column drives the entire hand-release reconnection mechanism 3 to move up, and the hand-release reconnection mechanism 3 is separated from the joint 21, and the packer is released successfully.
  • the hand-release reconnection mechanism 3 is disengaged, the reconnection locking claw 331 and the support tube 31 return to their original positions under the action of the spring force of the second resetting spring 34 .
  • Step S4 after the operation is completed, the hand-dropping and reconnecting mechanism 3 is lowered to connect the reconnecting locking claw 331 with the sealing locking mechanism 2, and the support member is moved so that the support member is supported on the inner side of the reconnecting locking claw 331.
  • the hand-release tie-back mechanism 3 is lowered to the sealing position of the packer, the hand-release tie-back mechanism 3 is lowered, and the tie-back locking claw 331 and the inner wall of the joint 21 form an extrusion stop action, and the hand-release tie-back mechanism 3 is continuously pressed down, and the tie-back locking claw 331 is retracted under force and detached from the support tube 31.
  • the support tube 31 continues to go down into the interior of the joint 21.
  • the reconnection locking claw 331 shrinks inwardly under the action of the downward pressure of the tubing string.
  • the overall outer diameter of the reconnection locking claw 331 shrinks, and the tubing string continues to go down.
  • the retracted reconnection locking claw 331 passes through the inner wall of the joint 21 and enters the first limiting groove 211. After the reconnection locking claw 331 enters the interior of the first limiting groove 211, under the action of the spring force of the second reset spring 34, the support tube 31 returns to its original position. The support tube 31 and the reconnection locking claw 331 form a forced lock again to prevent the reconnection locking claw 331 from being accidentally unlocked from the joint 21. The reconnection of the drop-down reconnection mechanism 3 and the packer is completed.
  • Step S5 lift the tubing string, the release and tie-back mechanism 3 drives the sealing locking mechanism 2 to move to the unsealing position, the cavity of the central tube 11 is connected with the first hole 121 and the second hole 122, the upper and lower pressures are balanced, and the tubing string continues to be lifted, the central tube 11 is separated from the sleeve, and then the repeatable release and tie-back packer is moved to the next working position by moving the tubing string.
  • the tubing string is lifted, and the limit assembly 22 is first unlocked and disengaged under a relatively small force, so that the upper and lower annuli of the packer are connected, and the upper and lower pressures are balanced (the tubing string is lowered to seal the packer, and the rubber cylinder 4124 is compressed and sealed, sealing the casing annulus outside the packer, and the core shaft 23 inside the packer is sealed and locked with the core shaft valve seat 111.
  • a check valve 232 is provided inside the core shaft 23, and the liquid in the annulus outside the packer cannot enter below the packer through the first hole 121 and the second hole 122.
  • the tubing string is lifted to unseal the packer, and the seal between the core shaft 23 inside the packer and the core shaft valve seat 111 is first unlocked, and the liquid in the upper part of the packer can be connected with the space in the lower part of the packer through the first hole 121 and the second hole 122, so that the upper pressure of the rubber cylinder 4124 is balanced with the lower pressure of the packer, preventing the packer from encountering resistance when being lifted), and the anchor claw returns under the action of the reset spring.
  • the pipe string is continuously lifted, the slip ring 424 compresses the rubber cylinder locking claw 421 and forcibly retracts it, the locking between the rubber cylinder locking claw 421 and the upper cone 4131 is released, and the upper anchoring mechanism is released.
  • the pipe string moves upward, the rubber cylinder 4124 is released from the compressed state, the upper cone 4131 moves upward, the slip 4133 is retracted under the action of the first return spring 4135, the lower anchoring mechanism is released, and the packer is unsealed.
  • the pipe string is continuously lifted and dragged to the next designed position, and the above steps are repeated to realize the movement of the pipe string to multiple positions.
  • the present application can effectively solve the problem that the double-seal single-strap fracturing process needs to frequently pull out the drill bit to adjust the distance between the two packers, and the pipe string between the two packers is severely eroded, and realizes the double-seal single-strap fracturing process technology with free distance without interlayer connecting oil pipes, effectively improving the efficiency of on-site construction operations.

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Abstract

一种可重复丢手回接封隔器及其操作方法，该可重复丢手回接封隔器包括中心机构(1)、密封锁定机构(2)和丢手回接机构(3)，中心机构（1）包括中心管(11)，中心管(11)的一端的侧壁上设有与中心管(11)的腔体连通的第一孔(121)和第二孔(122)；密封锁定机构(2)能够将第一孔(121)和第二孔(122)与中心管(11)的腔体连通或隔开；丢手回接机构(3)具有回接锁爪(331)和支撑件，支撑件设置为能够支撑在回接锁爪(331)的内侧或使得回接锁爪(331)脱离支撑件。封隔器在使用状态下，丢手回接机构(3)与密封锁定机构(2)分离，避免影响封隔器的正常使用，在需要调节自身位置时，可将丢手回接机构(3)与密封锁定机构(2)连接，进而使得封隔器在丢手回接机构(3)的带动下能够移动到下一工作位，避免出现频繁起钻的问题，提高施工效率。

Description

可重复丢手回接封隔器及其操作方法
相关申请的交叉引用
本申请要求2023年06月28日提交的中国专利申请202310779537.1的权益，该申请的内容通过引用被合并于本文。
技术领域
本发明涉及油田井下工具领域，具体地涉及一种可重复丢手回接封隔器及其操作方法。
背景技术
目前，双封单卡工具作为一种成熟的工具技术广泛应用分层压裂、求产作业。在双封单卡压裂工艺中，同一趟管柱压裂施工中上下封隔器之间的卡距是固定不可调整的，对于层间距不同的射孔段，需要频繁起钻调整两个封隔器之间的卡距，施工效率低。对此，中国发明专利CN114458235A公开了一种机械式可反复坐封桥塞，该机械式可反复坐封桥塞包括中心组件、上锚定组件、胶筒密封上下锥体组件、下摩擦锚定组件、反复滑动锁定组件和打捞坐封组件。其中，打捞坐封组件包括打捞工具上连接头、回收套和引鞋，打捞工具上连接头与回收套螺纹连接并通过防转钉进一步固定，回收套侧壁加工有安装槽、斜槽和回收槽。桥塞上接头上端连接有插入管，插入管上部径向带有凸起销，凸起销在安装槽、斜槽、回收槽内切换，完成丢手或对接。可见，该种设计方式的机械式可反复坐封桥塞能够通过转动桥塞上接头使得凸起销在安装槽、斜槽、回收槽内切换以完成丢手或对接，但该种通过转动桥塞上接头实现丢手或对接的方式容易出现操作失误导致桥塞上接头意外脱离插入管的现象发生，存在安全风险。
发明内容
为了解决上述传统的转动桥塞上接头实现丢手或对接的方式容易出现操作失误导致桥塞上接头意外脱离的现象发生，存在安全风险的技术问题，本发明提供了一种可重复丢手回接封隔器及其操作方法。
本发明提供了一种可重复丢手回接封隔器，包括：
中心机构，包括中心管，所述中心管的一端的侧壁上设有与所述中心管的腔体连通的第一孔和第二孔；
密封锁定机构，部分所述密封锁定机构伸入至所述中心管的内部，且所述密封锁定机构设置为能够移动于解封位置和密封锁定位置，使得所述密封锁定机构能够将所述第一孔和所述第二孔与所述中心管的腔体连通或隔开；
丢手回接机构，具有与所述密封锁定机构的伸出所述中心管的一端卡接连接的带有锁钩的回接锁爪以及能够限制所述回接锁爪内拢的支撑件，所述支撑件设置为能够支撑在所述回接锁爪的内侧或使得所述回接锁爪脱离所述支撑件。
可选地，所述密封锁定机构包括接头、限位组件以及与所述接头连接的芯轴，部分所述芯轴伸入至中心管的内部，所述接头能够带动所述芯轴移动于解封位置和密封锁定位置，使得所述芯轴将所述第一孔和所述第二孔与所述中心管的腔体连通或隔开，所述限位组件配置为能够对处于密封锁定位置下的所述芯轴进行限制或解除限制。
可选地，所述限位组件包括：
设置在所述芯轴外周的第二限位槽；和
设置在所述中心管的内壁上的芯轴锁爪，并配置为：
当所述芯轴处于密封锁定位置时，所述芯轴锁爪与所述第二限位槽相卡接。
可选地，所述芯轴的中部设有与所述中心管的腔体连通的开孔，所述开孔内设有单流阀，所述中心管的侧壁上设有与所述开孔连通的旁通孔，并配置为：
所述芯轴未移动至解封位置时，所述旁通孔与所述第二孔的位置相对，且所述第一孔与所述中心管的腔体连通；
所述芯轴移动至密封锁定位置时，所述旁通孔与所述第二孔的位置相对，所述芯轴封堵所述中心管的端部，以隔断所述第一孔与所述中心管的腔体。
可选地，所述芯轴的端部外周设有密封盘根，所述中心管的内壁设有芯轴阀座，当所述芯轴移动至密封锁定位置时，所述密封盘根与所述芯轴阀座的内壁相贴合以形成密封。
可选地，所述丢手回接机构包括支撑筒、套设在所述支撑筒外周的筒体以及设置在所述筒体与所述支撑筒之间的限位筒，所述回接锁爪设置在所述限位筒的端部，所述支撑件包括设置在所述支撑筒的端部的控制阀座，所述限位筒配置为能够沿着其轴向方向移动，以使得所述锁钩能够支撑在所述控制阀座的外周或者脱离所述控制阀座，所述接头的内部设有与所述锁钩相匹配的第一限位槽，且所述第一限位槽的长度大于所述回接锁爪的锁钩的长度。
可选地，所述可重复丢手回接封隔器还包括锚定结构，所述锚定结构设置在所述中心管的外周，包括锚定构件和坐封锁定构件，所述锚定构件配置为能够支撑在套筒的内壁上，或者与套筒分离，所述坐封锁定构件配置为当所述锚定构件支撑在套筒的内壁上时，能够保持所述锚定构件的状态。
可选地，所述锚定构件包括第一锚定构件本体，所述第一锚定构件本体包括设置在所述中心管的外周的座体，所述座体上设有多个安装孔，所述安装孔的内部设有定位锚爪，所述定位锚爪与所述安装孔的底壁之间通过锚爪复位弹簧连接，所述座体与所述安装孔相对应的位置处设有第一加压孔，所述座体上设有用于压紧所述定位锚爪的盖板。
可选地，所述锚定构件还包括第二锚定构件本体，所述第二锚定构件本体包括套设在所述中心管的外周的衬套以及滑动套设在所述衬套的外周的上胶筒座、下胶筒座和胶筒，所述上胶筒座和所述衬套分别与所述座体连接，所述胶筒设置在所述上胶筒座与所述下胶筒座之间。
可选地，所述锚定构件还包括第三锚定构件本体，所述第三锚定构件本体包括设置在所述中心管的外周的上锥体、下锥体以及设置在所述上锥体与所述下锥体之间的卡瓦，所述上锥体与下胶筒座连接，所述上锥体与所述下锥体的外周设有保护套，所述保护套与所述卡瓦相对应的位置处设有开口，所述保护套与所述卡瓦之间设有第一复位弹簧。
可选地，所述坐封锁定构件包括：
胶筒锁爪，与所述衬套连接，且所述胶筒锁爪与所述上锥体的内壁滑动配合；
环形锁块，设置在所述上锥体的内壁上；并配置为：
当所述胶筒处于压缩状态时，所述胶筒锁爪与所述环形锁块相卡接，以能够保持所述胶筒的压缩状态。
可选地，第三锚定构件本体还包括锁紧弹簧，所述锁紧弹簧设置在所述保护套与所述下胶筒座之间。
可选地，所述坐封锁定构件还包括滑环，所述滑环设置在所述中心管的外周，所述滑环的内侧设有与所述胶筒锁爪的第一斜坡面相匹配的第二斜坡面，以使得所述胶筒锁爪相对于所述滑环移动的过程中，所述胶筒锁爪能够内拢以脱离所述环形锁块。
可选地，所述可重复丢手回接封隔器还包括轨道切换机构，所述轨道切换机构包括：
轨迹管，与所述中心管的远离所述丢手回接机构的一端连接，所述轨迹管上设有多个坐封槽和 解封槽，多个所述坐封槽和所述解封槽组成J形轨道，所述上锥体、下锥体和所述卡瓦设置在所述轨迹管的外周；
切换环，设有切换销钉，所述切换环和所述切换销钉设置在所述J形轨道内，并配置为：
当上提所述轨迹管时，所述切换环能够转动，以使得所述切换销钉能够在所述坐封槽与所述解封槽之间切换。
可选地，所述可重复丢手回接封隔器还包括扶正机构，所述扶正机构套设在所述轨迹管的外周，所述扶正机构与套筒的内壁摩擦配合。
可选地，所述扶正机构包括：
扶正基座，套设在所述轨迹管的外周的，所述扶正基座与所述下锥体连接；
多个扶正块，沿着所述中心管的周向方向间隔设置在所述扶正基座上，且所述扶正块伸出所述扶正基座，所述扶正块与所述扶正基座之间设有压缩弹簧。
可选地，所述可重复丢手回接封隔器还包括反向封堵阀机构，所述反向封堵阀机构包括：
护套，与所述轨迹管的端部连接；
下接头，与所述护套连接；
反向封堵阀阀座，设置在所述护套的内部，所述反向封堵阀阀座与所述下接头抵接；
阀瓣，通过扭簧安装在所述反向封堵阀阀座上。
可选地，所述轨迹管外周设有下连接套，所述下连接套的两端分别与所述扶正块基座和所述护套连接。
可选地，所述支撑筒的筒壁设有第二加压孔，所述限位筒配置为在加压状态下朝向远离所述接头的方向移动，所述限位筒与所述筒体之间设有第二复位弹簧。
本发明还提供了一种可重复丢手回接封隔器的操作方法，包括以下步骤：
将可重复丢手回接封隔器下入井内，管柱下放过程中，丢手回接机构推动密封锁定机构下移，使得密封锁定机构移动至密封锁定位置，将中心管的腔体与封隔器和套管之间的环空隔开；
继续下放管柱，当管柱下入到预设位置，中心管支撑在套筒的内壁上；
移动支撑件以解除对回接锁爪的限制，上移丢手回接机构，直至回接锁爪脱离密封锁定机构，上体管柱，丢手回接机构与密封锁定机构分离，可重复丢手回接封隔器进行相应作业；
作业完成后，下入丢手回接机构，使得回接锁爪与密封锁定机构连接，移动支撑件以使得支撑件支撑在回接锁爪的内侧；
上提管柱，丢手回接机构带动密封锁定机构移动至解封位置，中心管的腔体与第一孔和第二孔连通，上下压力平衡，继续上提管柱，中心管脱离套筒，进而通过移动管柱将可重复丢手回接封隔器移动至下一工作位置。
本发明实施方式提供的技术方案与现有技术相比具有如下优点：
本发明提供的封隔器在使用状态下，丢手回接机构与密封锁定机构分离，避免影响封隔器的正常使用，在需要调节自身位置时，可将丢手回接机构与密封锁定机构连接，进而使得封隔器在丢手回接机构的带动下能够移动到下一工作位，避免出现频繁起钻的问题，提高施工效率，同时，本申请的丢手回接机构与密封锁定机构的拆卸需通过主动朝向支撑件施加作用力，以使得支撑件能够脱离回接锁爪的内侧，防止丢手回接机构与密封锁定机构意外脱离，确保施工的安全性，此外，封隔器在使用状态下，能够通过密封锁定机构始终将第一孔和第二孔与中心管的腔体隔开，进而将封隔器和套管之间的环空与中心管的腔体隔开，确保封隔器的正常使用。此外，通过上提下放管柱，以坐封封隔器，同时对封隔器进行丢手，然后上提管柱，坐封上封隔器，上下封隔器组成的双封单卡压裂方式较常规 的双封单卡压裂管柱具有上下封隔器之间无管柱连接的特点，因此能够避免封隔器之间管柱冲蚀，进而避免出现层间油管断裂、穿孔失效等井下复杂问题。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施方式，并与说明书一起用于解释本发明的原理。
为了更清楚地说明本发明实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施方式所述可重复丢手回接封隔器的结构示意图；
图2为本发明实施方式处于坐封状态下的部分所述可重复丢手回接封隔器的结构示意图；
图3为本发明实施方式丢手后的所述可重复丢手回接封隔器的结构示意图；
图4为本发明实施方式上半段的所述可重复丢手回接封隔器的结构示意图；
图5为本发明实施方式所述下半段的所述可重复丢手回接封隔器的结构示意图；
图6为本发明实施方式所述丢手回接机构的结构示意图；
图7为本发明实施方式所述密封锁定机构的结构示意图；
图8为本发明实施方式所述第一锚定构件本体的结构示意图；
图9为本发明实施方式所述第二锚定构件本体的结构示意图；
图10为本发明实施方式所述第三锚定构件本体的结构示意图；
图11为本发明实施方式所述扶正机构的结构示意图；
图12为本发明实施方式所述轨道切换机构的结构示意图；
图13为本发明实施方式所述轨道切换机构的J形轨道展开图；
图14为本发明实施方式所述反向封堵阀机构的结构示意图。
附图标记说明
1、中心机构；11、中心管；111、芯轴阀座；12、上连接套；121、第一孔；122、第二孔；2、
密封锁定机构；21、接头；211、第一限位槽；212、导向槽；22、限位组件；221、第二限位槽；222、芯轴锁爪；23、芯轴；231、开孔；232、单流阀；233、密封盘根；234、阀板；235、旁通孔；3、丢手回接机构；31、支撑筒；311、控制阀座；3111、密封胶套；32、筒体；33、限位筒；331、回接锁爪；34、第二复位弹簧；35、上接头；36、弹簧座；37、引鞋；38、第一密封圈；39、第二密封圈；4、锚定结构；41、锚定构件；411、第一锚定构件本体；4111、座体；4112、定位锚爪；4113、锚爪复位弹簧；4114、盖板；412、第二锚定构件本体；4121、衬套；4122、上胶筒座；4123、下胶筒座；4124、胶筒；413、第三锚定构件本体；4131、上锥体；4132、下锥体；4133、卡瓦；4134、保护套；4135、第一复位弹簧；42、坐封锁定构件；421、胶筒锁爪；422、环形锁块；423、锁紧弹簧；424、滑环；5、轨道切换机构；51、轨迹管；511、坐封槽；512、解封槽；52、切换环；521、切换销钉；6、扶正机构；61、扶正基座；62、扶正块；63、压缩弹簧；64、扶正压环；7、反向封堵阀机构；71、护套；72、下接头；73、反向封堵阀阀座；74、阀瓣；75、扭簧；8、下连接套。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面将对本发明的方案进行进一步描述。需要说明的是，在不冲突的情况下，本发明的实施方式及实施方式中的特征可以相互组合。
下面的描述中阐述了很多具体细节以便于充分理解本发明，但本发明还可以采用其他不同于在此描述的方式来实施；显然，说明书中的实施方式只是本发明的一部分实施方式，而不是全部的实施 方式。
结合图1至图5所示，本发明实施方式提供的可重复丢手回接封隔器包括中心机构1、密封锁定机构2和丢手回接机构3。
中心机构1包括中心管11，中心管11的一端的侧壁上设有与中心管11的腔体连通的第一孔121和第二孔122。具体地，中心管11的一端设有上连接套12，第一孔121和第二孔122设置在上连接套12的侧壁上。中心管11具有相对应的第一端和第二端，以图2所示方向为例，中心管11的第一端即为中心管11的左端，中心管11的第二端即为中心管11的右端。中心管11的第一端与上连接套12之间可直接连接，也可借助其他机构，使得中心管11的第一端与上连接套12之间间接连接。
如图4所示，部分密封锁定机构2伸入至中心管11的内部，且密封锁定机构2设置为能够移动于解封位置和密封锁定位置，使得密封锁定机构2能够将第一孔121和第二孔122与中心管11的腔体连通或隔开，进而能够将封隔器和套管之间的环空与中心管11的腔体与隔开。具体地，部分密封锁定机构2伸入至上连接套12的内部，且密封锁定机构2能够跟随丢手回接机构3移动，以使得密封锁定机构2能够在丢手回接机构3的带动下移动于解封位置和密封锁定位置，并且，密封锁定机构2能够保持在解封位置和密封锁定位置上。
丢手回接机构3具有与密封锁定机构2的伸出中心管11的一端卡接连接的带有锁钩的回接锁爪331以及能够限制回接锁爪331内拢的支撑件，支撑件设置为能够支撑在回接锁爪331的内侧或使得回接锁爪331脱离支撑件。具体地，支撑件能够主动移动，进而能够主动的脱离回接锁爪331或支撑在回接锁爪331的内部。
本发明提供的封隔器在使用状态下，丢手回接机构3与密封锁定机构2分离，避免影响封隔器的正常使用，在需要调节自身位置时，可将丢手回接机构3与密封锁定机构2连接，进而使得封隔器在丢手回接机构3的带动下能够移动到下一工作位，避免出现频繁起钻的问题，提高施工效率，同时，本申请的丢手回接机构3与密封锁定机构2的拆卸需通过主动朝向支撑件施加作用力，以使得支撑件能够脱离回接锁爪331的内侧，防止丢手回接机构3与密封锁定机构2意外脱离，确保施工的安全性，此外，封隔器在使用状态下，能够通过封隔器和套管之间的环空与中心管的腔体隔开，确保封隔器的正常使用。此外，通过上提下放管柱，以坐封封隔器，同时对封隔器进行丢手，然后上提管柱，坐封上封隔器，上下封隔器组成的双封单卡压裂方式较常规的双封单卡压裂管柱具有上下封隔器之间无管柱连接的特点，因此能够避免封隔器之间管柱冲蚀，进而避免出现层间油管断裂、穿孔失效等井下复杂问题。
结合图4和图7所示，密封锁定机构2包括接头21、限位组件22以及与接头21连接的芯轴23，部分芯轴23伸入至中心管11的内部，具体伸入至上连接套12的内部，接头21能够带动芯轴23移动于解封位置和密封锁定位置，使得芯轴23将第一孔121和第二孔122与中心管11的腔体连通或隔开，限位组件22配置为能够对处于密封锁定位置下的芯轴23进行限制或解除限制。其中，芯轴23的一端伸入至接头21的内部，并与接头21之间螺纹连接，以增加拆装的便利性，同时，可通过止退螺钉进一步紧固，以增加连接的牢固性。芯轴23的另一端伸入至上连接套12的内部，且芯轴23的伸入端设有台阶面，上连接套12套设在芯轴23的台阶面上，以避免芯轴23脱离上连接套12。
在一些实施方式中，如图7所示，限位组件22包括设置在芯轴23外周的第二限位槽221和设置在上连接套12的内壁上的芯轴锁爪222，且第二限位槽221与芯轴锁爪222相匹配。具体地，芯轴23的伸入至上连接套12的部分的外周的第二限位槽221。其中，当芯轴23处于密封锁定位置时，芯轴锁爪222与第二限位槽221相卡接，而当上提丢手回接机构3时，丢手回接机构3能够通过接头21带动芯轴23上移，进而使得芯轴锁爪222与芯轴23分离，完成芯轴23的解锁。该种设计方式的 限位组件22结构简单，且仅通过上提或下放丢手回接机构3即可完成分离或卡接过程，操作便利。
芯轴23的中部设有与中心管11的腔体连通的开孔231，开孔231内设有单流阀232，以供流体的单向流通，中心管(11)的侧壁上设有与开孔231连通的旁通孔235，具体在上连接套12的侧壁上开设旁通孔235。芯轴23未移动密封锁定位置时，旁通孔235与第二孔122的位置相对，且第一孔121与中心管11的腔体连通，上下压力平衡。芯轴23移动至密封锁定位置时，旁通孔235与第二孔122的位置相对，芯轴23封堵中心管11的端部，以隔断第一孔121与中心管11的腔体。该种设计方式下的芯轴23占用空间较小，使得整体结构更加紧凑。并且，无论是密封状态还是在非密封状态下，都能保证第一孔121或第二孔122与旁通孔235的位置完全对应，以使得流体的流量最大化，满足设计需求。
进一步优化地，芯轴23的端部外周设有密封盘根233，中心管11的内壁设有芯轴阀座111，当芯轴23移动至密封锁定位置时，密封盘根233与芯轴阀座111的内壁相贴合以形成密封，进而确保连接的紧密性，确保隔离效果。其中，芯轴23的端部螺纹连接有盘根锁帽，密封盘根233套设在密封盘根233的外周，以增加密封盘根233安装的便利性，且可通过旋拧盘根锁帽压紧密封盘根233，确保密封盘根233的固定效果。盘根锁帽的内部设有锥形孔，单流阀232安装在锥形孔的位置处，以通过锥形孔的坡面支撑单流阀232。其中，单流阀232的作用是密封锁定机构2在密封锁定后，能够通过单流阀232阻止上部液体进入到封隔器的下方。
进一步优化地，还可在芯轴23的开孔231的内部设置阀板234，阀板234通过盘根锁帽的端部支撑在芯轴23的内壁上，避免阀板234沿着芯轴23的轴向方向移动。其中，阀板234用于固定单流阀232的阀球，以将阀球限位在盘根锁帽的锥形孔内。
其中，第一孔121和第二孔122是开设在连接套12的侧壁上的两个孔。在密封锁定机构2处于锁定状态的情况下，如图2所示，第一孔121与芯轴23上的旁通孔235对应，连通封隔器的内部和外部；在密封锁定机构2未锁定的情况下，即芯轴23与下述的芯轴阀座111完全脱开的情况下，如图7所示，第二孔122与轴上的开孔231完全对应，连通封隔器的内部和外部。第一孔121和第二孔122的作用相同，都是封隔器反循环的通道，两个孔可以确保封隔器的芯轴23无论在哪种工况下，都可以保证其中一个孔与芯轴23上的旁通孔235完全对应，保留最大的反循环通道，最大限度的减弱液体对封隔器的芯轴23的冲蚀。
结合图4和图6所示，丢手回接机构3包括支撑筒31、套设在支撑筒31外周的筒体32以及设置在筒体32与支撑筒31之间的限位筒33。其中，支撑筒31的端部伸出筒体32，且支撑筒31的外周设有限位环，以通过限位环限制限位筒33的移动范围，避免限位筒33伸出筒体32。回接锁爪331设置在限位筒33的端部，锁钩设置在回接锁爪331的端部外侧，支撑件包括设置在支撑筒31的端部的控制阀座311，且控制阀座311的直径大于支撑筒31的直径，限位筒33配置为能够沿着其轴向方向移动，以使得锁钩能够支撑在控制阀座311的外周或者脱离控制阀座311，接头21的内部设有与锁钩相匹配的第一限位槽211，且第一限位槽211的长度大于回接锁爪331的锁钩的长度。
常态下，回接锁爪331的锁钩支撑在控制阀座311的外侧，避免回接锁爪331内拢。
当需要将锁钩插入至第一限位槽211内时，需使得限位筒33朝向远离控制阀座311的方向移动，使得锁钩脱离控制阀座311，此时，将回接锁爪331插入至接头21内，回接锁爪331能够在接头21的挤压下收拢，直至锁钩插入至第一限位槽211后，回接锁爪331展开，限位筒33复位，以使得锁钩支撑在控制阀座311的外周，避免回接锁爪331意外脱锁，确保使用的安全性。
当需要将丢手回接机构3与接头21脱离时，由于第一限位槽211的长度大于回接锁爪331的锁钩的长度，因此，锁钩可在第一限位槽211内移动。通过限位筒33朝向远离控制阀座311的方向移 动，使得锁钩脱离控制阀座311(锁钩始终处于第一限位槽211内)，再上提丢手回接机构3，即可使得锁钩脱离第一限位槽211，完成丢手回接机构3的分离过程，操作便利。
结合图1至图3所示，可重复丢手回接封隔器还包括锚定结构4，锚定结构4设置在中心管11的外周，包括锚定构件41和坐封锁定构件42，锚定构件41配置为能够支撑在套筒的内壁上，或者与套筒分离，坐封锁定构件42配置为当锚定构件41支撑在套筒的内壁上时，能够保持锚定构件41的状态。其中，当封隔器处于坐封状态下，可通过下放管柱的方式使得锚定构件41展开，以支撑在套筒的内壁上，此时，可通过坐封锁定构件42保持锚定构件41的状态，确保锚定构件41的支撑效果。
在一些实施方式中，如图8所示，锚定构件41包括第一锚定构件本体411，第一锚定构件本体411包括设置在中心管11的外周的座体4111，座体4111上设有多个安装孔，安装孔的内部设有定位锚爪4112，定位锚爪4112与安装孔的底壁之间通过锚爪复位弹簧4113连接，座体4111与安装孔相对应的位置处设有第一加压孔，座体4111上设有用于压紧定位锚爪4112的盖板4114。坐封状态下，可通过第一加压孔朝向安装孔的内部加压，此时，定位锚爪4112的内部压力高于外部压力，即封隔器的内部压力高于外部压力时，定位锚爪4112启动，定位锚爪4112在内外压差的作用下向外伸出，定位锚爪4112锚定在套管的内壁上。解封状态下，定位锚爪4112可在锚爪复位弹簧4113的作用下复位。其中，安装孔可为盲孔，且盲孔的数量为6个，6个盲孔分为两排并沿着中心管11的周向方向对称分布，定位锚爪4112和座体4111的外圆弧面上设计有凹槽，凹槽上安装有盖板4114以压紧定位锚爪4112和锚爪复位弹簧4113，并通过紧固螺钉固定盖板4114。
具体地，座体4111的端部伸出中心管11的第一端，芯轴阀座111螺纹连接在座体4111的伸出端的内壁，增加拆装的便利性。芯轴阀座111与座体4111的伸出端的内壁之间设有芯轴阀座111O形密封圈，确保连接的紧密性。上连接套12与座体4111的伸出端的外周螺纹连接，且部分芯轴锁爪222伸入至座体4111与上连接套12之间，上连接套12、部分芯轴锁爪222和座体4111的伸出端之间通过防转螺钉进一步紧固，确保连接的牢固性。
在另一些实施方式中，如图9所示，锚定构件41还包括第二锚定构件本体412，第二锚定构件本体412包括套设在中心管11的外周的衬套4121以及滑动套设在衬套4121的外周的上胶筒座4122、下胶筒座4123和胶筒4124，衬套4121与中心管11间隙配合，以形成与第一加压孔连通的液压通道，该液压通道与封隔器的下部连通，封隔器的下部压力一般高于封隔器的上部压力，此时封隔器的内部压力引入到上述的定位锚爪4112的内部，定位锚爪4112的外部所处环境外封隔器上部的油套环空，造成定位锚爪4112的内部压力高于外部压力，定位锚爪4112启动伸出发挥锚定管柱作用，其中，定位锚爪4112为本领域的常规技术，因此，对其工作原理未做过多的描述。
值得注意的是，下述的第三锚定构件本体413是坐封封隔器的时候启动，第三锚定构件本体413启动后，能够保证管柱不会上下移动，在第三锚定构件本体413启动后，如果封隔器的下部压力高于上部压力，第一锚定构件本体411启动，进一步保证管柱不会上下移动。如果封隔器下部压力不高于上部，此时，第一锚定构件本体411不会启动，对管柱也无其他影响。
上胶筒座4122和衬套4121分别与座体4111连接，胶筒4124设置在上胶筒座4122与下胶筒座4123之间，且胶筒4124的两端分别与上胶筒座4122和下胶筒座4123贴紧。该种设计方式下，当下放管柱时，管柱通过密封锁定以及第一锚定构件本体411推动上胶筒座4122和衬套4121移动，此时，由于胶筒4124可受力压缩，因此，衬套4121与上胶筒座4122、下胶筒座4123和胶筒4124相对移动，此过程中，胶筒4124压缩外扩，以支撑在套筒的内壁上，起到定位作用。
具体地，座体4111的朝向上胶筒座4122的一端设有分隔板，衬套4121设置在分隔板的内侧， 上胶筒座4122包裹在在分隔板的外侧，且上胶筒座4122与分隔板螺纹连接，增加拆装的便利性，此外，上胶筒座4122的内圈朝向分隔板的内侧伸出分隔板，并支撑在衬套4121的外周。衬套4121的外周与分隔板的内壁之间形成间隙，衬套4121的端部设有环形挡板，环形挡板能够在该间隙内滑动，并通过上胶筒座4122的内圈限制环形挡板的移动范围，避免行程过大。
在另一些实施方式中，如图10所示，锚定构件41还包括第三锚定构件本体413，第三锚定构件本体413包括设置在中心管11的外周的上锥体4131、下锥体4132以及设置在上锥体4131与下锥体4132之间的卡瓦4133。其中，第三锚定构件本体413可直接设置在中心管11的外周，或者第三锚定构件本体413通过其他结构设置在中心管11的外周。上锥体4131与下胶筒座4123连接，以使得下胶筒座4123能够推动上锥体4131移动，上锥体4131与下锥体4132的外周设有保护套，保护套套装在上锥体4131的外套截面上，以使得保护套能够带动上锥体4131向下移动，保护套与下锥体4132之间螺纹连接，保护套与卡瓦4133相对应的位置处设有开口，保护套与卡瓦4133之间设有第一复位弹簧4135。
具体地，上锥体4131和下锥体4132的坡面相对设置，卡瓦4133为多个，多个卡瓦4133安装在支撑机构(下述的轨迹管51)的外周面上，卡瓦4133与上锥体4131和下锥体4132相对应的位置处也分别设置坡面，以使得卡瓦4133与上锥体4131和下锥体4132之间的接触面为坡面。卡瓦4133的中部与保护套之间设有第一复位弹簧4135，且第一复位弹簧4135始终处于压缩状态，防止封隔器下钻过程中卡瓦4133提前启动。下放管柱过程中，可通过下胶筒座4123推动上锥体4131移动，卡瓦4133在坡面的作用下向外移动以伸出开口，并使得卡瓦4133支撑在套筒的内壁上，起到限位效果。外力消失后，卡瓦4133在第一复位弹簧4135的作用下收回至保护套4134的内部，以接触限位，此时，上锥体4131复位。
进一步优化地，如图9所示，第三锚定构件本体413还包括锁紧弹簧423，锁紧弹簧423设置在保护套4134与下胶筒座4123之间，且锁紧弹簧423套设在上锥体4131的外周。第三锚定构件本体413锚定的时候，下锥体4132上行带动保护套4134挤压锁紧弹簧423，因此第三锚定构件本体413锚定时，锁紧弹簧423一直处于压缩状态。封隔器上提时，管柱带动上锥体4131上行，同时锁紧弹簧423推动保护套4134下行，保护套4134带动下锥体4132下行，因此，上锥体4131上行，下锥体4132下行，卡瓦4133在第一复位弹簧4135的作用下恢复原状，解除锚定状态。
本申请的锚定构件41包括第一锚定构件本体411、第二锚定构件本体412和第三锚定构件本体413，以分布在可重复丢手回接封隔器的上部和下部位置处，使得可重复丢手回接封隔器均匀受力，以确保可重复丢手回接封隔器的坐封效果，保证封隔器在使用过程中同时承受下压和上压。即封隔器坐封后，胶筒4124密封管柱与套管之间的环空，封隔器内部的芯轴23密封管柱的内部环空，所以封隔器坐封后可以形成一道屏障，阻止封隔器上部和下部的连通。
在一些实施方式中，如图9所示，坐封锁定构件42包括胶筒锁爪421和环形锁块422。胶筒锁爪421与衬套4121连接，且胶筒锁爪421与上锥体4131的内壁滑动配合。环形锁块422设置在上锥体4131的内壁上。其中，且当胶筒4124处于压缩状态时，胶筒锁爪421与环形锁块422相卡接，已能够通过胶筒锁爪421与环形锁块422保持胶筒4124的压缩状态。
具体地，胶筒锁爪421的端部与衬套4121的端部外周螺纹连接，以增加拆装的便利性，下胶筒座4123的内壁加工有双台阶，以分别容纳胶筒锁爪421的端部和上锥体4131的端部，使得结构更加紧凑。胶筒锁爪421的锁钩朝外，且能够与上锥体4131的内壁之间相对滑动。胶筒锁爪421的锁钩的端部设有斜坡面，当胶筒锁爪421相对于上锥体4131的内壁移动过程中，胶筒锁爪421的锁钩与环形锁块422的内壁接触时，胶筒锁爪421在斜坡面的作用下向内收拢，以能够移动至环形锁块422 的另一侧，以实现胶筒锁爪421与环形锁块422的卡接。该种设计方式，当胶筒4124处于压缩状态下，且丢手回接机构3脱离时，可通过胶筒锁爪421与环形锁块422的配合防止胶筒4124的复位，以确保胶筒4124的锚定效果，进而确保安全施工。
进一步优化地，坐封锁定构件42还包括滑环424，滑环424设置在中心管11的外周，滑环424的内侧设有与胶筒锁爪421的第一斜坡面相匹配的第二斜坡面，以使得胶筒锁爪421相对于滑环424移动的过程中，胶筒锁爪421能够内拢以脱离环形锁块422。
具体地，当需要解封时，上提管柱，由于胶筒锁爪421与环形锁块422的卡接，因此，处于中心管11上的滑环424具有向上的运动趋势，以此通过第一斜坡面和第二斜坡面的配合推动胶筒锁爪421内拢，以使得胶筒锁爪421与环形锁块422主动脱锁，以减少胶筒锁爪421与环形锁块422之间的硬性接触造成的损伤，确保胶筒锁爪421与环形锁块422的使用寿命。
本发明的管柱外部与套管内部的环形空间通过胶筒4124密封，封隔器内部通过芯轴23密封，密封性能可靠，内外密封分别采用限位组件22和坐封锁定构件42锁定，可保证封隔器在密封过程中不会因为意外情况造成内外密封中途解锁失效。即内外密封形成后，封隔器在此处的作用相当于一个丢手坐封后的桥塞，封隔下部井段，可以对封隔器封隔的上部井段进行施工作业。
结合图12和图13所示，本申请的可重复丢手回接封隔器还包括轨道切换机构5，轨道切换机构5包括轨迹管51和切换环52。轨迹管51与中心管11的远离丢手回接机构3的一端螺纹连接，增加拆装的便利性，轨迹管51上设有多个坐封槽511和解封槽512，其中，坐封槽511的长度大于解封槽512的长度，多个坐封槽511和解封槽512组成J形轨道。上锥体4131、下锥体4132和卡瓦4133设置在轨迹管51的外周，以使得整体结构更加紧凑。切换环52上设有切换销钉521，其中，切换环52的相对应的沿径向加工有两个对称分布的通孔，切换销钉521为两个，两个切换销钉521分别设置在两个通孔内，切换环52和切换销钉521设置在J形轨道内，且当上提轨迹管51时，切换环52能够转动，以使得切换销钉521能够在坐封槽511与解封槽512之间切换。
如图11所示，本申请的可重复丢手回接封隔器还包括扶正机构6，扶正机构6套设在轨迹管51的外周，扶正机构6与套筒的内壁摩擦配合。扶正机构6用于保证封隔器在井筒中处于扶正状态，同时，能够为封隔器提供一定的摩擦力，避免封隔器的下放速度过快。
在一些实施方式中，扶正机构6包括扶正基座61和多个扶正块62。扶正基座61套设在轨迹管51的外周的，扶正基座61与下锥体4132螺纹连接。多个扶正块62沿着中心管11的周向方向间隔设置在扶正基座61上，且扶正块62伸出扶正基座61，扶正块62与扶正基座61之间设有压缩弹簧63，以通过压缩弹簧63将扶正块62顶出扶正基座61，扶正块62在压缩弹簧63提供的预紧力的支持下始终处于伸出状态，以使得扶正块62能够支撑在套筒的内壁上。其中，扶正块62上开设有多个盲孔，部分压缩弹簧63处于盲孔内，以通过盲孔对压缩弹簧63进行限位，并可限制压缩弹簧63的压缩方向，压缩弹簧63的弹力可根据实际需求进行设计。
进一步优化地，扶正机构6还包括扶正压环64，扶正压环64套设在轨迹管51的外周，且扶正压环64的端部与扶正基座61螺纹连接，且扶正压环64的端部伸入至扶正基座61，以使得扶正压环64的端部能够压在扶正块62的一侧边缘，扶正基座61的与扶正块62的另一侧边缘相对应的位置处设有压板，相应地，扶正块62的两端分别设有凸台，两个凸台分别与扶正压环64的端部和压板接触，以确保扶正块62的限位效果，避免扶正块62脱离扶正基座61，且压缩弹簧63在扶正基座61内处于压缩状态。通过设置扶正压环64使得扶正机构6的各部件分体设计，增加拆装和加工的便利性。
如图14所示，本申请的可重复丢手回接封隔器还包括反向封堵阀机构7，反向封堵阀机构7包括护套71、下接头72、反向封堵阀阀座73和阀瓣74。护套71与轨迹管51的端部连接。下接头72 与护套71连接。反向封堵阀阀座73设置在护套71的内部，反向封堵阀阀座73与下接头72抵接。阀瓣74通过扭簧75安装在反向封堵阀阀座73上。
具体地，护套71的内壁加工有台阶面，反向封堵阀阀座73装入护套71的内部，并且反向封堵阀阀座73的上端与护套71内壁的台阶面接触。反向封堵阀阀座73与护套71之间安装有反向封堵阀O形密封圈，以确保连接的紧密性。反向封堵阀阀座73的下端面与下接头72的上端面接触，下接头72与护套71之间螺纹连接，反向封堵阀阀座73安装有阀瓣74，反向封堵阀阀座73与阀瓣74之间采用扭簧75连接。
使用时，阀瓣74在扭簧75的弹簧力作用下，一般处于打开的状态，在封隔器下部液体压力高于上部压力的情况下，阀瓣74在压差的作用下，克服扭簧75的弹簧力，阀瓣74旋转90°与阀座73接触形成封堵状态，此时，反向封堵阀机构7的阀瓣74承受封隔器下部液体作用力，该作用力由反向封堵阀机构7传递到与其连接的护套71上，进而将作用力继续传递到下锥体4132上，进一步挤压卡瓦4133，以对第三锚定构件本体413起到辅助作用。
进一步优化地，轨迹管51外周设有下连接套8，下连接套8的两端分别与扶正块62基座和护套71连接，以增加连接的牢固性和结构的紧凑性。具体地，下连接套8的一端与扶正块62压环螺纹连接，下连接套8的另一端与护套71螺纹连接。下连接套8压紧切换环52的端面，确保切换环52沿着J形轨道移动。
在一些实施方式中，支撑筒31的筒壁设有第二加压孔，限位筒33配置为在加压状态下朝向远离接头21的方向移动，限位筒33与筒体32之间设有第二复位弹簧34。
具体地，限位筒33的伸入至支撑筒31与筒体32之间的端部设有环形推板，环形推板与支撑筒31的外周之间设有第一密封圈38，第二加压孔的远离第一密封圈38的一侧设有第二密封圈39，以使得第一密封圈38与第二密封圈39之间形成与第二加压孔连通的注压空间，当注压空间内注入压力，则压力将推动环形推板朝向远离接头21的方向移动，使得回接锁爪331脱离控制阀座311。当丢手回接机构3脱离接头21后，停止注压，回接锁爪331在第二复位弹簧34的作用下复位。该种设计方式的回接锁爪331通过加压的方式脱离控制阀座311，避免出现误操作，有效确保施工的安全性。
具体地，本申请的丢手回接机构3还包括与管柱连接的上接头35，筒体32与上接头35的外壁螺纹连接，支撑筒31与上接头35的内壁螺纹连接，筒体32与支撑筒31之间形成的环形空间内安装有弹簧座36，第二复位弹簧34和部分回接锁爪331处于环形空间内，第二复位弹簧34与弹簧座36连接。筒体32的端部螺纹连接有引鞋37，引鞋37用于控制回接锁爪331的伸出长度。控制阀座311的外周设有密封胶套3111，以增加控制阀座311与接头21连接的紧密性。
可以理解的是，本申请需要密封的部件之间可合理设置密封圈，以确保相应部件之间的密封连接。
本申请的接头21的端部设有导向槽212，导向槽212呈敞口状，导向槽212与第一限位槽211之间通过过渡槽连通，回接锁爪331在插入至接头21过程中，回接锁爪331优先在导向槽212的作用下内拢，以使得回接锁爪331的锁钩能够插入至第一限位槽211内，增加回接锁爪331插入的便利性。此外，第一限位槽211的两端侧壁设有坡面，便于锁钩脱离第一限位槽211。
本发明还提供了一种上述的可重复丢手回接封隔器的操作方法，包括以下步骤：
步骤S1，将可重复丢手回接封隔器下入井内，管柱下放过程中，丢手回接机构3推动密封锁定机构2下移，使得密封锁定机构2移动至密封锁定位置，将中心管11的腔体与封隔器和套管之间的环空隔开。
具体地，管柱下入过程中，由于扶正机构6与套筒内壁之间的摩擦，封隔器的接头21推动芯轴 23下移，芯轴23与芯轴阀座111接触形成密封，以将中心管11的腔体与封隔器和套管之间的环空隔开。芯轴锁爪222与芯轴23上的第二限位槽221锁定，密封锁定机构2功能激活。
步骤S2，继续下放管柱，当管柱下入到预设位置，中心管支撑在套筒的内壁上。此时，锚定构件41工作，使得锚定构件41支撑在套筒的内壁上，并通过坐封锁定构件42保持锚定构件41的状态。
具体地，继续下放管柱，管柱克服扶正机构6与套筒内壁之间的摩擦力下入到设计位置。上提管柱使封隔器的轨道切换机构5切换到封隔器坐封轨道上(切换销钉521滑动至坐封槽511内)。下放管柱，由于扶正机构6与套筒内壁之间的摩擦力，下放管柱时与扶正机构6螺纹连接的下锥体4132固定不动，扶正机构6以上部分向下移动，即上锥体4131向下移动，卡瓦4133受到挤压伸出保护套并锚定在套筒上，下部的锚定机构功能激活。管柱继续下放，胶筒4124压缩与套筒内壁形成密封，胶筒锁爪421与环形锁块422卡接，坐封锁定构件42的锁定功能激活，封隔器完成坐封，其中，关于坐封锁定构件42的结构形式已在上文描述，在此未做过多说明。
步骤S3，移动支撑件以解除对回接锁爪331的限制，上移丢手回接机构3，直至回接锁爪331脱离密封锁定机构2，上体管柱，丢手回接机构3与密封锁定机构2分离，可重复丢手回接封隔器进行相应作业。
具体地，管柱内部泵注液体施加压力，限位筒33在液压力的作用下上行。管柱内投适合尺寸的钢球，钢球坐落在控制阀座311的锥面上，钢球与控制阀座311形成密封。从井口向管柱内泵注压力，压力通过支撑筒31内的通道以及第二加压孔进入到注压注压空间内，形成的压力差推动回接锁爪331上移，推动支撑筒31下移，以使得回接锁爪331脱离支撑筒31，回接锁爪331与接头21之间的强制锁定解除。此时丢手回接机构3的内部压力推动回接锁爪331上移，回接锁爪331与一限位槽之间的锁定完全解除。继续上提管柱，管柱带动整个丢手回接机构3上移，丢手回接机构3与接头21脱离，封隔器丢手成功。且当丢手回接机构3脱离后，回接锁爪331和支撑筒31在第二复位弹簧34的弹簧力的作用下恢复原始位置。
步骤S4，作业完成后，下入丢手回接机构3，使得回接锁爪331与密封锁定机构2连接，移动支撑件以使得支撑件支撑在回接锁爪331的内侧。
具体地，下入丢手回接机构3到封隔器的坐封位置，丢手回接机构3下放，回接锁爪331与接头21的内壁形成挤压停止动作，继续下压丢手回接机构3，回接锁爪331受力缩回并与支撑筒31脱离。支撑筒31继续下入到接头21的内部，当支撑筒31与回接锁爪331完全脱离后，回接锁爪331在管柱下压力的作用下向内收缩，回接锁爪331整体外径缩小，管柱继续下行，收缩后的回接锁爪331通过接头21的内壁进入到第一限位槽211内，回接锁爪331进入到第一限位槽211的内部后，在第二复位弹簧34的弹簧力作用下，支撑筒31恢复到原始位置，支撑筒31与回接锁爪331再一次形成强制锁定，防止回接锁爪331与接头21意外解锁，丢手回接机构3与封隔器回接完成。
步骤S5，上提管柱，丢手回接机构3带动密封锁定机构2移动至解封位置，中心管11的腔体与第一孔121和第二孔122连通，上下压力平衡，继续上提管柱，中心管11脱离套筒，进而通过移动管柱将可重复丢手回接封隔器移动至下一工作位置。
具体地，上提管柱，限位组件22在较小作用力下首先解锁脱离，封隔上下环空之间连通，上下压力平衡(下放管柱坐封封隔器，胶筒4124压缩坐封，密封封隔器外部的油套环空，封隔器内部芯轴23与芯轴阀座111密封锁定，芯轴23内部设置有单流阀232，封隔器外部环空的液体无法通过第一孔121和第二孔122进入到封隔器以下。上提管柱解封封隔器，封隔器内部芯轴23与芯轴阀座111密封首先解除锁定，封隔器上部的液体可以通过第一孔121和第二孔122与封隔器下部的空间连通，使胶筒4124的上部压力与封隔器下部压力平衡，防止封隔器上提遇阻)，锚爪在复位弹簧作用力下回 收。继续上提管柱，滑环424压缩胶筒锁爪421强行回收，胶筒锁爪421与上锥体4131之间的锁定解除，上部锚定机构锚定解除。管柱上行，胶筒4124解除压缩状态，上锥体4131上行，卡瓦4133在第一复位弹簧4135的作用下回收，下部锚定机构锚定解除，封隔器解封完成。继续上提拖动管柱到下一个设计位置，重复上述步骤，可实现管柱多个位置的移动。
此外，封隔器坐封丢手后，可通过管柱打压的方式对封隔器密封有效性进行验证，确保密封效果。
本申请能够有效解决双封单卡压裂工艺中需要频繁起钻调整两个封隔器之间的卡距，且两个封隔器之间的管柱冲蚀严重的难题，实现无层间连接油管的自由卡距双封单卡压裂工艺技术，有效提升现场施工作业效率。
需要说明的是，在本文中，诸如“第一”和“第二”等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本发明的具体实施方式，使本领域技术人员能够理解或实现本发明。对这些实施方式的多种修改对本领域的技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施方式中实现。因此，本发明将不会被限制于本文所述的这些实施方式，而是要符合与本文所发明的原理和新颖特点相一致的最宽的范围。

Claims (20)

  1. 一种可重复丢手回接封隔器，其特征在于，包括：
    中心机构(1)，包括中心管(11)，所述中心管(11)的一端的侧壁上设有与所述中心管(11)的腔体连通的第一孔(121)和第二孔(122)；
    密封锁定机构(2)，部分所述密封锁定机构(2)伸入至所述中心管(11)的内部，且所述密封锁定机构(2)设置为能够移动于解封位置和密封锁定位置，使得所述密封锁定机构(2)能够将所述第一孔(121)和所述第二孔(122)与所述中心管(11)的腔体连通或隔开；
    丢手回接机构(3)，具有与所述密封锁定机构(2)的伸出所述中心管(11)的一端卡接连接的带有锁钩的回接锁爪(331)以及能够限制所述回接锁爪(331)内拢的支撑件，所述支撑件设置为能够支撑在所述回接锁爪(331)的内侧或使得所述回接锁爪(331)脱离所述支撑件。
  2. 根据权利要求1所述的可重复丢手回接封隔器，其特征在于，所述密封锁定机构(2)包括接头(21)、限位组件(22)以及与所述接头(21)连接的芯轴(23)，部分所述芯轴(23)伸入至中心管(11)的内部，所述接头(21)能够带动所述芯轴(23)移动于解封位置和密封锁定位置，使得所述芯轴(23)将所述第一孔(121)和所述第二孔(122)与所述中心管(11)的腔体连通或隔开，所述限位组件(22)配置为能够对处于密封锁定位置下的所述芯轴(23)进行限制或解除限制。
  3. 根据权利要求2所述的可重复丢手回接封隔器，其特征在于，所述限位组件(22)包括：
    设置在所述芯轴(23)外周的第二限位槽(221)；和
    设置在所述中心管(11)的内壁上的芯轴锁爪(222)，并配置为：
    当所述芯轴(23)处于密封锁定位置时，所述芯轴锁爪(222)与所述第二限位槽(221)相卡接。
  4. 根据权利要求2所述的可重复丢手回接封隔器，其特征在于，所述芯轴(23)的中部设有与所述中心管(11)的腔体连通的开孔(231)，所述开孔(231)内设有单流阀(232)，所述中心管(11)的侧壁上设有与所述开孔(231)连通的旁通孔(235)，并配置为：
    所述芯轴(23)未移动至解封位置时，所述旁通孔(235)与所述第二孔(122)的位置相对，且所述第一孔(121)与所述中心管(11)的腔体连通；
    所述芯轴(23)移动至密封锁定位置时，所述旁通孔(235)与所述第二孔(122)的位置相对，所述芯轴(23)封堵所述中心管(11)的端部，以隔断所述第一孔(121)与所述中心管(11)的腔体。
  5. 根据权利要求4所述的可重复丢手回接封隔器，其特征在于，所述芯轴(23)的端部外周设有密封盘根(233)，所述中心管(11)的内壁设有芯轴阀座(111)，当所述芯轴(23)移动至密封锁定位置时，所述密封盘根(233)与所述芯轴阀座(111)的内壁相贴合以形成密封。
  6. 根据权利要求2所述的可重复丢手回接封隔器，其特征在于，所述丢手回接机构(3)包括支撑筒(31)、套设在所述支撑筒(31)外周的筒体(32)以及设置在所述筒体(32)与所述支撑筒(31)之间的限位筒(33)，所述回接锁爪(331)设置在所述限位筒(33)的端部，所述支撑件包括设置在所述支撑筒(31)的端部的控制阀座(311)，所述限位筒(33)配置为能够沿着其轴向方向移动，以使得所述锁钩能够支撑在所述控制阀座(311)的外周或者脱离所述控制阀座(311)，所述接头(21)的内部设有与所述锁钩相匹配的第一限位槽(211)，且所述第一限位槽(211)的长度大于所述回接锁爪(331)的锁钩的长度。
  7. 根据权利要求1所述的可重复丢手回接封隔器，其特征在于，所述可重复丢手回接封隔器还包括锚定结构(4)，所述锚定结构(4)设置在所述中心管(11)的外周，包括锚定构件(41)和坐封锁定构件(42)，所述锚定构件(41)配置为能够支撑在套筒的内壁上，或者与套筒分离，所述坐封锁 定构件(42)配置为当所述锚定构件(41)支撑在套筒的内壁上时，能够保持所述锚定构件(41)的状态。
  8. 根据权利要求7所述的可重复丢手回接封隔器，其特征在于，所述锚定构件(41)包括第一锚定构件本体(411)，所述第一锚定构件本体(411)包括设置在所述中心管(11)的外周的座体(4111)，所述座体(4111)上设有多个安装孔，所述安装孔的内部设有定位锚爪(4112)，所述定位锚爪(4112)与所述安装孔的底壁之间通过锚爪复位弹簧(4113)连接，所述座体(4111)与所述安装孔相对应的位置处设有第一加压孔，所述座体(4111)上设有用于压紧所述定位锚爪(4112)的盖板(4114)。
  9. 根据权利要求8所述的可重复丢手回接封隔器，其特征在于，所述锚定构件(41)还包括第二锚定构件本体(412)，所述第二锚定构件本体(412)包括套设在所述中心管(11)的外周的衬套(4121)以及滑动套设在所述衬套(4121)的外周的上胶筒座(4122)、下胶筒座(4123)和胶筒(4124)，所述上胶筒座(4122)和所述衬套(4121)分别与所述座体(4111)连接，所述胶筒(4124)设置在所述上胶筒座(4122)与所述下胶筒座(4123)之间。
  10. 根据权利要求9所述的可重复丢手回接封隔器，其特征在于，所述锚定构件(41)还包括第三锚定构件本体(413)，所述第三锚定构件本体(413)包括设置在所述中心管(11)的外周的上锥体(4131)、下锥体(4132)以及设置在所述上锥体(4131)与所述下锥体(4132)之间的卡瓦(4133)，所述上锥体(4131)与下胶筒座(4123)连接，所述上锥体(4131)与所述下锥体(4132)的外周设有保护套(4134)，所述保护套(4134)与所述卡瓦(4133)相对应的位置处设有开口，所述保护套(4134)与所述卡瓦(4133)之间设有第一复位弹簧(4135)。
  11. 根据权利要求10所述的可重复丢手回接封隔器，其特征在于，所述坐封锁定构件(42)包括：胶筒锁爪(421)，与所述衬套(4121)连接，且所述胶筒锁爪(421)与所述上锥体(4131)的内壁滑动配合；
    环形锁块(422)，设置在所述上锥体(4131)的内壁上；并配置为：
    当所述胶筒(4124)处于压缩状态时，所述胶筒锁爪(421)与所述环形锁块(422)相卡接，以能够保持所述胶筒(4124)的压缩状态。
  12. 根据权利要求10所述的可重复丢手回接封隔器，其特征在于，所述第三锚定构件本体(413)还包括锁紧弹簧(423)，所述锁紧弹簧(423)设置在所述保护套(4134)与所述下胶筒座(4123)之间。
  13. 根据权利要求11所述的可重复丢手回接封隔器，其特征在于，所述坐封锁定构件(42)还包括滑环(424)，所述滑环(424)设置在所述中心管(11)的外周，所述滑环(424)的内侧设有与所述胶筒锁爪(421)的第一斜坡面相匹配的第二斜坡面，以使得所述胶筒锁爪(421)相对于所述滑环(424)移动的过程中，所述胶筒锁爪(421)能够内拢以脱离所述环形锁块(422)。
  14. 根据权利要求10所述的可重复丢手回接封隔器，其特征在于，所述可重复丢手回接封隔器还包括轨道切换机构(5)，所述轨道切换机构(5)包括：
    轨迹管(51)，与所述中心管(11)的远离所述丢手回接机构(3)的一端连接，所述轨迹管(51)上设有多个坐封槽(511)和解封槽(512)，多个所述坐封槽(511)和所述解封槽(512)组成J形轨道，所述上锥体(4131)、下锥体(4132)和所述卡瓦(4133)设置在所述轨迹管(51)的外周；
    切换环(52)，设有切换销钉(521)，所述切换环(52)和所述切换销钉(521)设置在所述J形轨道内，并配置为：
    当上提所述轨迹管(51)时，所述切换环(52)能够转动，以使得所述切换销钉(521)能够在所述坐封槽(511)与所述解封槽(512)之间切换。
  15. 根据权利要求14所述的可重复丢手回接封隔器，其特征在于，所述可重复丢手回接封隔器还包括扶正机构(6)，所述扶正机构(6)套设在所述轨迹管(51)的外周，所述扶正机构(6)与套筒的内壁摩擦配合。
  16. 根据权利要求15所述的可重复丢手回接封隔器，其特征在于，所述扶正机构(6)包括：
    扶正基座(61)，套设在所述轨迹管(51)的外周的，所述扶正基座(61)与所述下锥体(4132)连接；
    多个扶正块(62)，沿着所述中心管(11)的周向方向间隔设置在所述扶正基座(61)上，且所述扶正块(62)伸出所述扶正基座(61)，所述扶正块(62)与所述扶正基座(61)之间设有压缩弹簧(63)。
  17. 根据权利要求16所述的可重复丢手回接封隔器，其特征在于，所述可重复丢手回接封隔器还包括反向封堵阀机构(7)，所述反向封堵阀机构(7)包括：
    护套(71)，与所述轨迹管(51)的端部连接；
    下接头(72)，与所述护套(71)连接；
    反向封堵阀阀座(73)，设置在所述护套(71)的内部，所述反向封堵阀阀座(73)与所述下接头(72)抵接；
    阀瓣(74)，通过扭簧(75)安装在所述反向封堵阀阀座(73)上。
  18. 根据权利要求17所述的可重复丢手回接封隔器，其特征在于，所述轨迹管(51)外周设有下连接套(8)，所述下连接套(8)的两端分别与所述扶正块(62)基座和所述护套(71)连接。
  19. 根据权利要求6所述的可重复丢手回接封隔器，其特征在于，所述支撑筒(31)的筒壁设有第二加压孔，所述限位筒(33)配置为在加压状态下朝向远离所述接头(21)的方向移动，所述限位筒(33)与所述筒体(32)之间设有第二复位弹簧(34)。
  20. 一种可重复丢手回接封隔器的操作方法，其特征在于，包括以下步骤：
    将可重复丢手回接封隔器下入井内，管柱下放过程中，丢手回接机构(3)推动密封锁定机构(2)下移，使得密封锁定机构(2)移动至密封锁定位置，将中心管(11)的腔体与封隔器和套管之间的环空隔开；
    继续下放管柱，当管柱下入到预设位置，中心管支撑在套筒的内壁上；
    移动支撑件以解除对回接锁爪(331)的限制，上移丢手回接机构(3)，直至回接锁爪(331)脱离密封锁定机构(2)，上体管柱，丢手回接机构(3)与密封锁定机构(2)分离，可重复丢手回接封隔器进行相应作业；
    作业完成后，下入丢手回接机构(3)，使得回接锁爪(331)与密封锁定机构(2)连接，移动支撑件以使得支撑件支撑在回接锁爪(331)的内侧；
    上提管柱，丢手回接机构(3)带动密封锁定机构(2)移动至解封位置，中心管(11)的腔体与第一孔(121)和第二孔(122)连通，上下压力平衡，继续上提管柱，中心管(11)脱离套筒，进而通过移动管柱将可重复丢手回接封隔器移动至下一工作位置。
PCT/CN2024/079903 2023-06-28 2024-03-04 可重复丢手回接封隔器及其操作方法 Ceased WO2025001271A1 (zh)

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CN104314511A (zh) * 2014-11-12 2015-01-28 中国石油天然气股份有限公司 一种压缩式底封封隔器
CN112228005A (zh) * 2020-09-27 2021-01-15 齐齐哈尔亚盛机械制造有限公司 一种低坐封力起井泄压的可捞桥塞
CN115637936A (zh) * 2021-07-19 2023-01-24 中国石油天然气集团有限公司 回接装置、悬挂完井一体化封隔器、完井管柱及回接工艺
CN115142811A (zh) * 2022-06-23 2022-10-04 中国石油天然气集团有限公司 一种非旋转式可重复坐封封隔器以及其坐封、解封方法
CN115726723A (zh) * 2022-11-23 2023-03-03 托普威尔石油技术股份公司 一种加力坐封工具及小直径堵塞器

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CN119616406A (zh) * 2025-02-12 2025-03-14 中国石油大学(华东) 一种具有稳定支撑性能的井下封隔器及其使用方法
CN120100364A (zh) * 2025-04-15 2025-06-06 盘锦中亚石油技术有限公司 一种注二氧化碳封隔器
CN120291831A (zh) * 2025-06-03 2025-07-11 中国石油集团西部钻探工程有限公司 二氧化碳气密性封隔器
CN121251282A (zh) * 2025-12-04 2026-01-02 东营市兆鑫工贸有限责任公司 一种油田用套管外封隔器

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