A retrievable whipstock for multilateral horizontal wells and a method for running and retrieving the same

Abstract

The application discloses a recyclable whip-lay device and a lowering and recycling method thereof. The recyclable whip-lay device comprises a detachable fixed communication whip-lay device and a setting device. The setting device comprises an inner cylinder, a central pipe and an outer pipe which are coaxially sleeved from inside to outside, and a cylinder shell. A capsule packer is sleeved on the outer wall of the lower end of the outer pipe. The recyclable whip-lay device can make the slip body arranged in the outer pipe move along the radial direction of the inner cylinder and the axial direction of the inner cylinder simultaneously under the high-pressure fluid driving, and the slip body can pass through the setting port arranged on the outer pipe to engage with the casing to realize the first-stage setting. After the radial expansion of the capsule packer, the capsule packer can be attached to the inner wall of the casing to realize the second-stage setting. The setting device can be used as a casing hanger and a casing running and releasing device. After the two-stage setting is realized, the drill tool is only needed to be rotated by a certain angle, and then the drill tool is lifted to realize the releasing of the setting device without affecting the casing lowering tension and pressure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of multi-lateral drilling and completion, and particularly relates to a recyclable whipstock for multi-lateral horizontal wells and a lowering and recycling method thereof. BACKGROUND

[0002] With the development of horizontal well and directional well technologies, on the basis of existing drilling, lateral drilling of horizontal wells and coalbed methane extraction using multi-lateral horizontal wells have been widely used. However, simply relying on low-speed grinding or repeated grinding of open holes by screw drill tools to open branches has defects such as low efficiency, low success rate and poor quality. Therefore, a whipstock used in cooperation with a directional drill tool has been developed. At present, the recyclable whipstock has become a key tool.

[0003] The recyclable whipstock used in the prior art mainly adopts a mechanical setting mode, and has poor setting reliability. The whipstock and the setting tool are used as a whole. Since the setting tool has a long working time and a complex working environment in the well, the device is prone to failure and cannot be released. If the setting tool cannot be released, the whipstock is difficult to recycle. In addition, during the completion operation of the branch well, the whole operation process is complex, has high risk, and cannot be subjected to casing milling, milling and other operations, which leads to the whipstock being unable to be recycled, and eventually leads to the wellbore being abandoned.

[0004] In summary, it is urgent to develop a recyclable whipstock suitable for multi-lateral horizontal well drilling and a lowering and recycling method thereof to improve the efficiency, success rate and quality of opening branches of horizontal wells. SUMMARY

[0005] The present application aims to provide a recyclable whipstock for multi-lateral horizontal wells and a lowering and recycling method thereof to solve the technical problems of unstable setting of the recyclable whipstock for multi-lateral horizontal wells and lack of reliable lowering and recycling method in the prior art.

[0006] The technical scheme adopted by the present application is as follows:

[0007] A recyclable whipstock comprises a detachable and fixed communication whipstock and setting tool. The whipstock comprises a whipstock lower connector and a whipstock lower connector. The setting tool comprises an inner cylinder, an inner cavity is arranged in the inner cylinder, a limiting step is arranged in the inner cavity, the limiting step is used for limiting the locking ball entering the inner cavity, a first outer tube is arranged on the outer side of the upper end of the inner cylinder, and a second outer tube is arranged on the outer side of the lower end of the inner cylinder. A capsule packer is arranged outside the second outer tube,

[0008] A plurality of axial positioning keys are arranged on the outer wall of the whipstock lower connector in the circumferential direction. A groove is further arranged below the axial positioning keys in the circumferential direction of the whipstock lower connector.

[0009] A plurality of axial key grooves are arranged on the inner wall of the first outer tube in a circumferential direction, and the axial key grooves are matched with axial positioning keys; a snap mechanism matched with the recess is arranged on the inner wall of the first outer tube below the axial key grooves;

[0010] The outer side of the inner cylinder is further sleeved with a central tube, the central tube comprises a central tube body and an upper wedge block which are connected from bottom to top, the lower end of the central tube body extends into the second outer tube, a lower wedge block is sleeved on the outer side of the middle part of the central tube body, and the inclined surfaces of the upper wedge block and the lower wedge block are oppositely arranged;

[0011] A slip body is arranged on the outer side of the upper wedge block, and slip teeth are arranged on the outer wall of the slip body in a circumferential direction; the slip body is connected with the upper wedge block by means of a limiting mechanism;

[0012] A cylinder body is arranged between the lower wedge block and the second outer tube, the cylinder body comprises a cylinder shell and a piston body arranged in a circumferential direction of the cylinder shell, a first annular space is formed between the lower end surface of the piston body, the inner wall of the cylinder shell, the upper end surface of the second outer tube and the outer wall of the central tube body, and a second annular space is formed between the upper end surface of the piston body, the inner wall of the cylinder shell, the lower end surface of the lower wedge block and the outer wall of the central tube body;

[0013] After the locking ball is put into the inner cylinder, the locking ball is limited by the limiting step, the high-pressure fluid entering the inner cylinder pushes the lower wedge block to move upward along the axis of the inner cylinder and cuts off the shear pin in sequence through the first water outlet hole arranged on the pipe wall of the inner cylinder and the second water outlet hole arranged on the central tube body, and the slip body moves along the radial direction and the axial direction of the inner cylinder at the same time, thereby pushing the slip body to move along the radial direction and the axial direction of the inner cylinder at the same time, so that the slip teeth are engaged with the casing or the well wall through the setting hole arranged on the first outer tube to realize primary setting, and the casing is coaxially sleeved with the recyclable whipstock;

[0014] The high-pressure fluid entering the second annular space also pushes the cylinder body to move downward along the axis of the central tube, thereby pushing the capsule packer to expand along the radial direction of the second outer tube and then adhere to the inner wall of the casing or the well wall to realize secondary setting.

[0015] The present application also has the following technical features:

[0016] Specifically, a plurality of outer protrusions are arranged on the outer wall of the upper end of the inner cylinder in a circumferential direction at intervals, a plurality of inner protrusions are arranged on the inner wall of the bottom end of the first outer tube in a circumferential direction at intervals, gaps are formed between adjacent inner protrusions, and the outer protrusions can pass through the gaps;

[0017] A stop block is arranged on one side of the upper end surface of the upper wedge block, and the stop block is used for limiting the outer protrusions.

[0018] Further, the capsule packer comprises a capsule pressing disc, a first rubber sleeve, a second rubber sleeve and a third rubber sleeve arranged coaxially, the upper end surface of the capsule pressing disc is in abutment with the lower end surface of the cylinder shell, and the lower end surface of the third rubber sleeve is in abutment with the upper end surface of the spiral part of the bottom of the second outer tube.

[0019] Further, the inner cavity comprises a first cavity, a second cavity and a third cavity penetrating from top to bottom, the connecting part of the second cavity and the third cavity forms the limiting step, and the limiting step is used for limiting the locking ball entering the inner cavity.

[0020] The first water outlet hole is arranged on the outer wall of the inner cylinder corresponding to the second cavity and close to the limiting step.

[0021] Further, the upper end of the cylinder shell is provided with a cylinder shell water outlet hole in the radial direction, the cylinder shell water outlet hole is coaxially communicated with the pressure relief groove arranged on the wall of the first outer tube, and the hollow spring pin capable of extending and contracting in the radial direction of the cylinder shell is arranged in the pressure relief groove.

[0022] The lower wedge-shaped block is provided with a lower wedge-shaped block water passage, and the two ends of the lower wedge-shaped block water passage are respectively communicated with the cylinder shell water outlet hole and the second annular space.

[0023] The hollow spring pin is inserted and matched with the lower wedge-shaped block water passage.

[0024] Further, the limiting mechanism comprises a limiting screw, the limiting screw is inserted into the sliding groove of the upper wedge-shaped block through the mounting hole arranged in the radial direction of the slip body, the bottom end of the limiting screw is connected with a limiting nut, the top of the limiting screw is provided with a nut, and the nut and the upper surface of the slip body are provided with a compression spring.

[0025] Further, the upper end of the whipstock is sleeved with a bowl-shaped sealing ring.

[0026] Further, the upper end side wall of the whipstock is sequentially provided with a first whipstock pad, a whipstock lifting groove, a whipstock recovery thread and a second whipstock pad from top to bottom, the first whipstock pad, the whipstock lifting groove and the second whipstock pad are arranged in the axial direction of the whipstock, and the whipstock recovery thread is arranged in the circumferential direction of the whipstock.

[0027] The whipstock is provided with a through hole in the axial direction, and the inner part of the through hole is provided with a whipstock internal thread.

[0028] The application also protects a lowering and recycling method of the recyclable whipstock,

[0029] The lowering method comprises the following steps:

[0030] (1) connect the upper end of the setting tool with the bottom end of the drill pipe, and lower the setting tool into the well to the designed position by means of the drill pipe;

[0031] (2) put the locking ball into the drill pipe, so that the compression capsule packer is attached to the inner wall of the casing, and the slip body is completely engaged with the inner wall of the casing through the first outer pipe, and the two-stage setting is completed;

[0032] (3) connect the hollow lowering tool pipe with the bottom of the upper drill pipe, send the whipstock into the well, and adjust the whipstock tool face angle to the designed angle, then pressurize to make the axial positioning key enter the axial key groove, and continue to pressurize to make the elastic clamping mechanism enter the groove, so as to realize the locking of the whipstock;

[0033] (4) rotate the drill pipe and the hollow lowering tool pipe in the forward direction to complete the lowering of the recyclable whipstock;

[0034] The recycling method comprises the following steps: (a) setting a recycling tool hook at the bottom end of the hollow lowering tool pipe;

[0035] (b) connecting the lower end of the drill pipe with the upper end of the hollow lowering tool pipe, sending the recycling tool hook to the whipstock lifting groove, starting the pump and rotating the drill pipe to flush the whipstock lifting groove, after flushing, continue to rotate the drill pipe to make the recycling tool hook enter the whipstock lifting groove, and realize the lap locking of the recycling tool hook and the whipstock lifting groove;

[0036] (c) lifting the hollow lowering tool pipe to recycle the whipstock to the ground; and completing the recycling of the recyclable whipstock.

[0037] Further, the recycling tool hook comprises an annular tool hook body, and a first water flow channel is arranged in the annular tool hook body.

[0038] The first water flow channel is in communication with a second water flow channel arranged in the hollow lowering tool pipe, and the first water flow channel is also in communication with a water outlet hole arranged on the inner wall of the annular tool hook body.

[0039] The beneficial effects of the present application are:

[0040] (1) The setting tool and the whipstock of the recyclable whipstock are detachably fixedly connected, after the setting tool is lowered into the well together with the casing, the setting tool can be used as a casing hanger to avoid the casing from moving, and the setting tool can also be used as a casing lowering release, through structural design, after the two-stage setting is realized, the release can be realized only by lifting the drill pipe and the inner pipe, the design of the present application is simple, and the release of the setting tool is realized under the premise of ensuring that the casing lowering tension and pressure are not affected.

[0041] (2) The invention has simple structure, short length, simple setting motion, one-way clamping of the deflector, no recovery motion of the setting tool, improved setting stability, only the locking pin of the shearing elastic clamping mechanism is lifted and sheared to realize the recovery in the recovery process, the mechanism is not affected by the well inclination and the full angle change rate, and has strong adaptability to different types of multi-lateral horizontal wells and different well sections.

[0042] (3) The method can simplify the lowering and recovery operation of the recoverable whipstock, ensure BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0044] Figure 1 is a structural schematic view of the recoverable whipstock of the present invention;

[0045] Figure 2 is a structural schematic view of the setting tool of the present invention;

[0046] Figure 3 is a structural schematic view of the deflector of the present invention;

[0047] Figure 4 is a structural schematic view of the deflector lowering pipe string of the present invention;

[0048] Figure 5 is a structural schematic view of the local structure of the present invention;

[0049] Figure 6 is a schematic view of the unlocking state of the inner boss and the outer boss;

[0050] Figure 7 is a structural schematic view of the limiting mechanism.

[0051] The various reference signs in the drawings represent:

[0052] 1-whipstock, 2-set bonder, 3-shear pin, 4-lock ball, 5-bowl seal ring, 6-first whipstock pad, 7-whipstock lifting groove, 8-whipstock recovery thread, 9-second whipstock pad; 10-whipstock inner thread; 11-whipstock lower joint; 21-inner cylinder, 22-first outer tube, 23-second outer tube, 24-center tube body, 25-lower wedge block, 26-upper wedge block, 27- slip body, 28-limiting mechanism, 29-cylinder body; 121-axial positioning key, 122-groove; 210-capsule packer; 211-first water outlet hole, 212-outer boss; 221-axial key groove, 222-snap mechanism, 223-inner boss, 224-pressure relief groove, 225-set bonding mouth, 226-set bonder top groove; 241-second water outlet hole; 251-lower wedge block water passage; 261-stop block; 262-sliding groove; 271-slip tooth, 272-mounting hole; 281-limiting screw, 282-nut, 283-compression spring; 284-limiting nut; 291-cylinder housing, 292-piston body, 293-hollow spring pin; 2101-capsule pressure plate, 2102-first rubber cylinder, 2103-second rubber cylinder, 2104-third rubber cylinder; A-recovery tool hook. DETAILED DESCRIPTION

[0053] In accordance with the above technical solutions, the following specific embodiments of the present application are given. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent variations made on the basis of the technical solutions of the present application fall within the scope of the present application.

[0054] The terms "upper", "lower", "front", "rear", "top", "bottom", etc. used in the present application indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. "Inner" and "outer" refer to the inner and outer contours of the corresponding components, and the above terms should not be understood as limiting the present application. In the present application, the front, rear, etc. are described as shown. Figure 1

[0055] In addition, the ordinal numbers "first", "second", etc. are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0056] ​In this invention, unless otherwise stated, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] It should be noted that, unless otherwise specified, all parts used in this invention are commercially available. In the orientation description of this solution, the end of the setting device closest to the guide vane is designated as the upper end, and the end furthest from the guide vane as the lower end.

[0058] Example 1

[0059] Following the above technical solutions, such as Figures 1 to 6 As shown, this embodiment provides a detachable and fixedly connected guide device 1 and a setting device 2; the guide device 1 is used for side-drilling window opening and guide, and the setting device 2 is used for axial and radial fixation of the guide device, while also enabling the suspension of the lower casing string in the well.

[0060] The sealing device 2 includes an inner cylinder 21, which has an inner cavity. The inner cavity has a limiting step, which is used to limit the locking ball 4 inserted into the inner cavity and create pressure in the inner cavity. A first outer tube 22 is fitted on the outer side of the upper end of the inner cylinder 21, and a second outer tube 23 is fitted on the outer side of the lower end of the inner cylinder 21. A capsule packer 210 is fitted on the outer side of the second outer tube 23.

[0061] Multiple axial positioning keys 121 are provided circumferentially on the outer wall of the lower connector 12 of the guide. A groove 122 is also provided below the axial positioning key 121 along the circumference of the lower connector 12 of the guide. A spring-loaded mechanism mounting hole 123 is provided at the upper end of the axial positioning key 121 along the radial direction of the lower connector 12 of the guide.

[0062] Multiple axial keyways 221 are provided along the circumferential direction on the inner wall of the first outer tube 22. The axial keyways 221 are adapted to the axial positioning key 121. A spring-loaded mechanism 222 adapted to the groove 122 is provided on the inner wall of the first outer tube 22 below the axial keyway 221.

[0063] In this embodiment, preferably, a top groove 226 for the seater is also provided on the inner wall of the upper end of the first outer tube 22; the top groove 226 for the seater is used for the locking connection and fixation of the first outer tube 22 and the bottom of the guide lower connector 12.

[0064] The inner cylinder 21 is further sleeved with a central pipe, which comprises a central pipe body 24 and an upper wedge block 26 connected from bottom to top, the lower end of the central pipe body 24 extends into the second outer pipe 23, and the outer side of the middle part of the central pipe body 24 is sleeved with a lower wedge block 25; the upper wedge block 26 is oppositely arranged with the inclined surface of the lower wedge block 25; the central pipe is tightly matched with the inner cylinder 21, the central pipe body 24 is connected with the second outer pipe 23 through threads, the upper wedge block 26 and the lower wedge block 25 are oppositely arranged with inclined surfaces, the upper wedge block 26 is connected with the first outer pipe 22 through threads, and the inner cylinder 21 is connected with the lower wedge block 25 through a shear pin 3.

[0065] The outer side of the upper wedge block 26 is provided with a slip body 27, the outer wall of the slip body 27 is circumferentially provided with slip teeth 271; the slip body 27 is connected with the upper wedge block 26 through a limiting mechanism 28; and the bottom surface of the slip body 27 is provided with two inclined surfaces which can be respectively matched with the lower wedge block 25 and the upper wedge block 26.

[0066] The lower wedge block 25 and the second outer pipe 23 are provided with a cylinder body 29, the cylinder body 29 comprises a cylinder shell 291 and a piston body 292 arranged circumferentially along the cylinder shell 291, a first annular space is formed between the lower end surface of the piston body 292, the inner wall of the cylinder shell 291, the upper end surface of the second outer pipe 23 and the outer wall of the central pipe body 24, and a second annular space is formed between the upper end surface of the piston body 292, the inner wall of the cylinder shell 291 and the lower end surface of the lower wedge block 25.

[0067] After the locking ball 4 is put into the inner cylinder, the locking ball 4 is limited by the limiting step which plays the role of ball seat, the high-pressure fluid entering the inner cylinder 21 pushes the lower wedge block 25 to move axially upward along the inner cylinder 21 in sequence through the first water outlet hole 211 arranged on the pipe wall of the inner cylinder 21 and the second water outlet hole 241 arranged on the central pipe body 24, and simultaneously shears the shear pin 3, so as to push the slip body 27 to move along the radial direction of the inner cylinder 21 and the axial direction of the inner cylinder 21 at the same time, so that the slip teeth 271 are out of the setting mouth 225 arranged on the first outer pipe 22 and are engaged with the casing or well wall to realize primary setting, and the casing is coaxially sleeved outside the recyclable whipstock; in the embodiment, the number of the slip body 27 and the limiting mechanism is 6, which are equally and interval arranged along the circumference of the inner cylinder, the lower wedge block 25 and the upper wedge block 26 are coaxially sleeved outside the inner cylinder 21, and the cross section thereof is shown in the figure, which is wedge-shaped. Figure 1 The high-pressure fluid entering the second annular space also pushes the cylinder body 29 to move axially downward along the inner cylinder, and then pushes the capsule packer to expand radially along the second outer pipe 23, so as to be attached to the inner wall of the casing to realize secondary setting.

[0068] As shown in the figure, Figure 2As shown, the inner cylinder 21, the center pipe body 24, the second outer pipe 23, the cylinder shell 291 and the first outer pipe 22 are coaxially sleeved from inside to outside along the radial direction of the lower end of the inner cylinder 21.

[0069] The number of the axial key grooves 221 and the axial positioning keys 121 are matched, when the guide device 1 is inserted into the setting tool 2, the axial positioning keys 121 can be inserted into the corresponding axial key grooves 221, the elastic clamping mechanism 222 is inserted into the groove 122, the elastic clamping mechanism 222 can be radially expanded and contracted along the first outer pipe 22, when the guide device 1 is inserted, the elastic clamping mechanism 222 is first pressed and pushed into the wall of the first outer pipe 22, and when it is not pressed, it pops out into the groove 122, through the cooperation of the axial key grooves 221 and the axial positioning keys 121, and the cooperation of the elastic clamping mechanism 222 and the groove, the fixed connection of the guide device 1 and the setting tool 2 is realized.

[0070] As a preferred scheme of the embodiment, a plurality of outer bosses 212 are arranged on the outer wall of the upper end of the inner cylinder 21 in a circumferential direction, a plurality of inner bosses 223 are arranged on the inner wall of the bottom end of the first outer pipe 22 in a circumferential direction, gaps are formed between adjacent inner bosses 223, the outer bosses 212 can pass through the gaps and can descend to abut against the upper end face of the upper wedge block 26.

[0071] As shown, Figure 5 In the embodiment, the number of the outer bosses 212 is two, and they are mirror-symmetrically arranged.

[0072] As a preferred scheme of the embodiment, a stop block 261 is arranged on one side of the upper end face of the upper wedge block 26, the stop block 261 can be arranged on one side of the upper end face, used for limiting the outer boss 212, so that the rotating outer boss 212 can stop rotating after encountering the stop block 261, and therefore the outer boss 212 can only rotate by a certain angle.

[0073] As a preferred scheme of the embodiment, the capsule packer 210 includes a capsule pressing disc 2101, a first rubber cylinder 2102, a second rubber cylinder 2103 and a third rubber cylinder 2104 which are coaxially connected, the upper end face of the capsule pressing disc 2101 abuts against the lower end face of the cylinder shell 29, and the lower end face of the third rubber cylinder 2104 abuts against the upper end face of the helical part of the second outer pipe 23.

[0074] When the capsule packer 210 is subjected to pressure from the cylinder body 29, the first rubber cylinder 2102, the second rubber cylinder 2103 and the third rubber cylinder 2104 can all radially expand.

[0075] As a preferred scheme of the embodiment, the inner cavity comprises a first cavity, a second cavity and a third cavity which are vertically through; a limiting step is formed at the connection of the second cavity and the third cavity, and the limiting step is used for limiting the locking ball 4 entering the inner cavity; the locking ball 4 is blocked by the limiting step, so that the pressure in the inner cavity is built up, and the pressure seal is realized.

[0076] The first water outlet hole 211 is arranged on the outer wall of the inner cylinder 21 corresponding to the second cavity and close to the limiting step.

[0077] As a preferred scheme of the embodiment, a cylinder shell water outlet hole is arranged on the upper end of the cylinder shell 291 in the radial direction, the cylinder shell water outlet hole is coaxially communicated with the pressure relief groove 224 arranged on the pipe wall of the first outer pipe 22, and the hollow spring pin 293 which can be radially extended and retracted along the cylinder shell 291 is arranged in the cylinder shell water outlet hole and the pressure relief groove 224.

[0078] The lower wedge block 25 is internally provided with a lower wedge block water passage 251, and in the embodiment, the lower wedge block water passage is L-shaped, and the two ends of the L-shaped lower wedge block water passage 251 can be respectively communicated with the cylinder shell water outlet hole and the second annular space; when the lower wedge block 25 moves upward along the inner cylinder 21 in the axial direction, the lower wedge block water passage 251 moves to be communicated with the cylinder shell water outlet hole, the hollow spring pin 293 enters the lower wedge block water passage 251, the plug-in cooperation is formed, and the high-pressure liquid in the second annular space flows out of the setting tool 2 through the lower wedge block water passage 251, the hollow spring pin 292 and the pressure relief groove 224, and the pressure relief is completed.

[0079] As a preferred scheme of the embodiment, as shown in Figure 6 The limiting mechanism 28 comprises a limiting screw 281, the limiting screw 281 passes through the sliding groove 262 of the upper wedge block 26 through the mounting hole 272 arranged in the radial direction of the slip body 27, the bottom end of the limiting screw 281 is connected with a limiting nut 284, the top of the limiting screw 281 is provided with a nut 282, the compression spring 283 is arranged between the nut 282 and the upper surface of the slip body 27, and the limiting screw 281 can move in the axial direction thereof.

[0080] As a preferred scheme of the embodiment, the bowl-shaped sealing ring 5 is sleeved on the lower end of the whipstock 1, and the outer diameter of the bowl-shaped sealing ring 5 matches the inner diameter of the casing or the wellbore. The bowl-shaped sealing ring 3 is used for preventing the rock debris from entering the packer, and ensuring that the old wellbore is well sealed during the branch sidetracking process.

[0081] As a preferred scheme of the embodiment, the upper end side wall of the angle iron 11 is sequentially provided from top to bottom with a first guide wedge pad 6, a guide wedge lifting groove 7, a guide wedge recovery thread 8 and a second guide wedge pad 9, the first guide wedge pad 6, the guide wedge lifting groove 7 and the second guide wedge pad 9 are arranged in the axial direction of the angle iron 11, and the guide wedge recovery thread 8 is arranged in the circumferential direction of the angle iron 11.

[0082] The angle iron 11 is provided with a through hole in the axial direction, and the through hole is internally provided with a guide wedge internal thread 10, which is a tapered reverse thread, and is used to connect the guide wedge 1 and the upper directional drilling tool during the lowering process of the guide wedge 1.

[0083] The use process of the embodiment is as follows:

[0084] First, the setting of the setting tool 2 is completed, including connecting the setting tool 2 at the bottom of the drilling tool and lowering it into the well to the designed position, and the lower end can be in a free state or connected with a casing string. The locking ball 4 is put into the drilling rod, the locking ball 4 is limited by the limiting step after entering the inner cylinder 21, the pump is started, the well mouth starts to build pressure, at this time, the cylinder body 29 is lowered to compress the capsule packer 210, so that the rubber tube is inflated to completely adhere to the inner wall of the casing; at the same time, the slip body 27 is cut off after the shear pin 3 is cut off under the action of the lower wedge block 25, and then it is raised, during the upward movement, the slip body 27 will not overturn under the action of the limiting mechanism 28, the slip body 27 moves from the inner side of the setting tool 2 along the radial direction and the axial direction of the inner cylinder 21 at the same time, and is completely engaged with the inner wall of the casing or the well wall through the first outer tube 22, after a certain distance of relative movement, the hollow spring pin 293 enters the lower wedge block water passage 251, the second annulus, the lower wedge block water passage 251, the hollow spring pin 293 and the pressure relief groove 224 form a pressure relief channel, the setting tool completes two-stage setting, the positive rotary drilling tool is rotated by a certain angle, limited by the stop block 261, the outer protruding boss 212 is rotated to the position where the gap between the inner protruding boss 223 is coincided, the drilling tool is lifted, and the drilling tool and the inner cylinder 21 are separated as a whole from the setting tool.

[0085] Then, the guide wedge 1 is connected at the bottom of the directional drilling tool, lowered to a certain distance above the designed position, and the angle iron 11 is faced to the designed direction by rotating the directional drilling tool, the guide wedge 1 is lowered to the upper part of the setting tool 2, the axial positioning key 121 is entered into the axial key groove 221 by pressurizing, and then the elastic clamping mechanism 222 is entered into the recess 122 by further pressurizing, so as to realize the locking of the guide wedge 1, and the recyclable whipstock is lowered.

[0086] After the window sidetracking operation of the recyclable whipstock is completed, the recovery tool is lowered, and the drilling tool is lifted to take out the guide wedge 1.

[0087] The recyclable whipstock provided by the application is subjected to field construction inspection, the setting device and the guide device adopt detachable fixed connection structure, so that the device length is short during use, the two-stage setting action is simple, the whipstock is one-way clamped, the whipstock operation is not affected by the well deviation and the full angle change rate, and the whipstock has strong adaptability to different types of multi-lateral horizontal wells and different well sections.

[0088] Embodiment 2

[0089] The embodiment discloses a lowering and recycling method of a recyclable whipstock.

[0090] The lowering method comprises the following steps:

[0091] (1) connecting the upper end of the setting device with the bottom end of the drill pipe, and lowering the setting device to the designed position in the well by means of the drill pipe;

[0092] (2) putting the locking ball into the drill pipe, so that the compression capsule packer is attached to the inner wall of the casing, and the slip body is completely engaged with the inner wall of the first outer pipe and the casing or the well wall, and the two-stage setting is completed;

[0093] (3) rotating the drilling tool by a certain angle, and then taking out the drilling tool and the inner pipe of the setting device;

[0094] (4) connecting the hollow lowering tool pipe with the bottom of the upper drill pipe, sending the whipstock into the well, and adjusting the whipstock tool face angle to the designed angle, and then pressurizing to make the axial positioning key enter the axial key groove, and continuing to pressurize to make the elastic clamping mechanism enter the groove, so that the whipstock is locked;

[0095] (5) rotating the drilling tool and the hollow lowering tool pipe in the forward direction, and completing the lowering of the recyclable whipstock;

[0096] The recycling method comprises the following steps: (a) setting a recycling tool hook at the bottom end of the hollow lowering tool pipe;

[0097] (b) connecting the lower end of the drill pipe with the upper end of the hollow lowering tool pipe, sending the recycling tool hook to the whipstock lifting groove, opening the pump and rotating the drilling tool to flush the whipstock lifting groove, after flushing, continuing to rotate the drilling tool, so that the recycling tool hook enters the whipstock lifting groove, and the recycling tool hook and the whipstock lifting groove are lapped and locked;

[0098] (c) lifting the hollow lowering tool pipe, and recycling the whipstock to the ground; and completing the recycling of the recyclable whipstock.

[0099] The recycling tool hook comprises a ring-shaped tool hook body, a first water flow channel is arranged in the ring-shaped tool hook body, the first water flow channel is communicated with a second water flow channel arranged in the hollow lowering tool pipe, and the first water flow channel is also communicated with a water outlet hole arranged on the inner wall of the ring-shaped tool hook body.

[0100] After the first branch lateral drilling is completed, the hollow running tool pipe is lowered to recover the whipstock, the drilling rig is used to pull up the tool pipe, the snap mechanism is cut off to pull up the whipstock, and then the whipstock is recovered. If the recovery tool hook fails, the existing public taper, recovery sleeve and female taper tool can be used for recovery. The recovery process has simple structure and less mechanism action, thereby greatly improving the recovery success rate.

[0101] In other embodiments, another specification of whipstock with different length and angle of inclination than the whipstock used in the first time can be lowered to a distance above the design position by using the directional drilling tool combination, the directional drilling tool is rotated to the design orientation, the whipstock 1 is lowered to the upper part of the setting tool 2, the axial positioning key 121 is pressed into the axial key groove 221, the newly installed top snap mechanism 222 is locked with the top groove 226 of the setting tool, the second stage of the recoverable whipstock is lowered, and the second branch lateral drilling is performed.

[0102] In other embodiments, when the branch lateral drilling is completed and wellbore reentry is needed, the whipstock is selected according to the characteristics of the branch to be reentered, the whipstock is lowered to a preset distance above the lateral drilling point by using the directional drilling tool combination and the hollow running tool pipe, the whipstock 1 is rotated to the original lateral drilling orientation, the whipstock 1 is lowered to the upper part of the setting tool 2, the axial positioning key 121 is pressed into the axial key groove 221, and the whipstock is locked by using the weight of the whipstock. After the running tool and the hollow running tool pipe are pulled out, the wellbore or drilling drilling tool combination is lowered into the predetermined branch to achieve branch reentry.

[0103] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0104] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0105] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A retrievable whipstock, characterized by, The device comprises a detachable fixed communication whipstock (1) and setting tool (2), the whipstock (1) comprises a connecting setting whip iron (11) and whipstock lower connector (12); the setting tool (2) comprises an inner cylinder (21), the inner cylinder (21) is provided with an inner cavity, the inner cavity is provided with a limiting step, the limiting step is used for limiting the locking ball (4) in the inner cavity, the outer side of the upper end of the inner cylinder (21) is provided with a first outer tube (22), and the outer side of the lower end of the inner cylinder (21) is provided with a second outer tube (23); the second outer tube (23) is provided with a capsule packer (210) outside; A plurality of axial positioning keys (121) are arranged on the outer wall of the whipstock lower connector (12) in the circumferential direction, and grooves (122) are further arranged on the whipstock lower connector (12) in the circumferential direction below the axial positioning keys (121); A plurality of axial key grooves (221) are arranged on the inner wall of the first outer tube (22) in the circumferential direction, and the axial key grooves (221) are matched with the axial positioning keys (121); the inner wall of the first outer tube (22) below the axial key grooves (221) is provided with a snap mechanism (222) matched with the grooves (122); The inner cylinder (21) is further provided with a central tube, the central tube comprises a central tube body (24) and an upper wedge block (26) connected from bottom to top, the lower end of the central tube body (24) extends into the second outer tube (23), and the outer side of the middle part of the central tube body (24) is provided with a lower wedge block (25); the upper wedge block (26) is arranged opposite to the inclined surface of the lower wedge block (25); The outer side of the upper wedge block (26) is provided with a pad body (27), the outer wall of the pad body (27) is provided with a pad tooth (271) in the circumferential direction; the pad body (27) is connected with the upper wedge block (26) by means of a limiting mechanism (28); The lower wedge block (25) and the second outer tube (23) are provided with a cylinder body (29), the cylinder body (29) comprises a cylinder shell (291) and a piston body (292) arranged in the circumferential direction of the cylinder shell (291), and the lower end surface of the piston body (292), the inner wall of the cylinder shell (291), the upper end surface of the second outer tube (23) and the outer wall of the central tube body (24) form a first annular space; the upper end surface of the piston body (292), the inner wall of the cylinder shell (291), the lower end surface of the lower wedge block (25) and the outer wall of the central tube body (24) form a second annular space; After the locking ball (4) is put into the inner cylinder, the locking ball (4) is limited by the limiting step, the high-pressure fluid entering the inner cylinder (21) passes through the first water outlet hole (211) arranged on the pipe wall of the inner cylinder (21) and the second water outlet hole (241) arranged on the central pipe body (24) in sequence, enters the second annular space, pushes the lower wedge block (25) to move upward along the axis of the inner cylinder (21), and cuts the shear pin (3), the slip body (27) moves along the radial direction of the inner cylinder (21) and the axial direction of the inner cylinder (21) at the same time, and then the slip body (27) is pushed to move along the radial direction of the inner cylinder (21) and the axial direction of the inner cylinder (21) at the same time, so that the slip teeth (271) pass through the setting hole arranged on the first outer pipe and engage with the casing or the well wall to realize primary setting, and the casing is coaxially sleeved with the recyclable whipstock; The high-pressure fluid entering the second annular space also pushes the cylinder body (29) to move downward along the axis of the central pipe body (24), and then pushes the capsule packer (210) to expand along the radial direction of the second outer pipe (23) and then adhere to the inner wall of the casing or the well wall to realize secondary setting.

2. The retrievable whipstock of claim 1, wherein, A plurality of outer bosses (212) are arranged on the outer wall of the upper end of the inner cylinder (21) in a circumferential direction, a plurality of inner bosses (223) are arranged on the inner wall of the middle part of the first outer pipe (22) in a circumferential direction, gaps are formed between adjacent inner bosses (223), and the outer bosses (212) can pass through the gaps; The upper end face of the upper wedge block (26) is provided with a stop block (261) on one side, and the stop block (261) is used for limiting the outer boss (212).

3. The retrievable whipstock of claim 1, wherein, The capsule packer (210) comprises a capsule pressing disc (2101), a first rubber cylinder (2102), a second rubber cylinder (2103) and a third rubber cylinder (2104) which are coaxially connected, the upper end face of the capsule pressing disc (2101) abuts against the lower end face of the cylinder shell (291), and the lower end face of the third rubber cylinder (2104) abuts against the upper end face of the spiral part arranged at the bottom of the second outer pipe (23).

4. The retrievable whipstock of claim 1, wherein, The inner cavity comprises a first cavity, a second cavity and a third cavity which are through in the upper and lower directions; the connecting part of the second cavity and the third cavity forms the limiting step, and the limiting step is used for limiting the locking ball (4) entering the inner cavity; The first water outlet hole (211) is arranged on the outer wall of the inner cylinder (21) corresponding to the second cavity and close to the limiting step.

5. The retrievable whipstock of claim 1, wherein, A cylinder shell water outlet hole is arranged on the upper end of the cylinder shell (291) in the radial direction, the cylinder shell water outlet hole is communicated with the pressure relief groove (224) arranged on the pipe wall of the first outer pipe (22), and a hollow spring pin (293) capable of stretching and contracting in the radial direction of the cylinder shell (291) is arranged in the cylinder shell water outlet hole and the pressure relief groove (224). The lower wedge block (25) is provided with a lower wedge block water passage (251), and the two ends of the lower wedge block water passage (251) can be communicated with the cylinder shell water outlet hole and the second annular space respectively. The hollow spring pin (293) can be inserted and matched with the lower wedge block water passage (251).

6. The retrievable whipstock of claim 1, wherein, The limiting mechanism (28) comprises a limiting screw (281) penetrating into a sliding groove (262) of the upper wedge block (26) through an installation hole (272) radially formed in the slip body (27), and a bottom end of the limiting screw (281) is connected with a limiting nut (284), and a top of the limiting screw (281) is provided with a nut (282), and a compression spring (283) is arranged between the nut (282) and an upper surface of the slip body (27).

7. The retrievable whipstock of claim 1 wherein, The guide wedge (1) is sleeved with a bowl-shaped sealing ring (5) at an upper end.

8. The retrievable whipstock of claim 1, wherein, First guide wedge pads (6), guide wedge lifting grooves (7), guide wedge recovery threads (8) and second guide wedge pads (9) are sequentially arranged on a sidewall of an upper end of the wedge iron (11) from top to bottom, the first guide wedge pads (6), the guide wedge lifting grooves (7) and the second guide wedge pads (9) are arranged in an axial direction of the wedge iron (11), and the guide wedge recovery threads (8) are arranged in a circumferential direction of the wedge iron (11). A through hole is arranged in an axial direction in the wedge iron (11), and a guide wedge inner thread (10) is arranged inside the through hole.

9. A method of retrieving a retrievable whipstock according to any one of claims 1 to 8, wherein, The lowering method comprises the following steps: (1) connecting an upper end of a setting tool with a bottom end of a drill pipe, and lowering the setting tool into a design position in a well by means of the drill pipe; (2) putting a locking ball into the drill pipe, and making a compression capsule packer adhere to an inner wall of a casing by means of hydraulic pressure, and making a slip body completely engage with the inner wall of the casing or a borehole wall through a first outer pipe, and completing two-stage setting; (3) connecting a hollow lowering tool pipe with a bottom of an upper drill pipe, sending a guide wedge into the well, and adjusting a tool face angle of the guide wedge to a design angle, and then pressurizing to make an axial positioning key enter an axial key groove, and continuing to pressurize to make a snap mechanism enter a groove, and realizing locking of the guide wedge; (4) rotating the drill tool and the hollow lowering tool pipe in a forward direction, and completing lowering of the recyclable whipstock; The recycling method comprises the following steps: (a) arranging a recycling tool hook at a bottom end of the hollow lowering tool pipe; (b) connecting a lower end of the drill pipe with an upper end of the hollow lowering tool pipe, sending the recycling tool hook to the guide wedge lifting groove, opening a pump and rotating the drill tool to flush the guide wedge lifting groove, and after flushing, continuing to rotate the drill tool to make the recycling tool hook enter the guide wedge lifting groove, and realizing clamping and locking of the recycling tool hook and the guide wedge lifting groove; (c) lifting the hollow lowering tool pipe to recycle the guide wedge to the ground, and completing recycling of the recyclable whipstock. The recycling tool hook comprises an annular tool hook body, a first water flow channel is arranged in the annular tool hook body, the first water flow channel is communicated with a second water flow channel arranged in the hollow lowering tool pipe, and the first water flow channel is also communicated with a water outlet hole formed on an inner wall of the annular tool hook body.

10. The method of claim 9, wherein, ​ ​

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