A modular bidirectional slip anchoring mechanism

Abstract

This invention discloses a modular bidirectional slip anchoring mechanism, comprising a bidirectional slip assembly, a working cylinder, an upper cone, a slip sleeve, a lower cone, a first shearing pin, and a second shearing pin. The bidirectional slip assembly is disposed on the outer wall of the working cylinder. The upper and lower cones are respectively positioned above and below the bidirectional slip assembly, and both are coaxially fitted around the working cylinder with a gap. The slip sleeve is coaxially fitted around the working cylinder, the upper cone, and the lower cone, separating the upper and lower cones, and engages with the bidirectional slip assembly. The first shearing pin is used to fix the working cylinder and the lower cone, and the second shearing pin is used to fix the working cylinder and the slip sleeve. This anchoring mechanism has the same good bidirectional anchoring advantages as an integral bidirectional slip, and employs a three-step unsealing method, requiring only a unidirectional upward force for unsealing, making it easy to operate on-site.

Description

Technical Field

[0001] This invention relates to the field of packer anchoring mechanisms in oilfields, and particularly to a modular bidirectional slip anchoring mechanism. Background Technology

[0002] A packer is a downhole tool used to seal the annulus (or) isolate a target section, control injected or produced fluids, and withstand differential pressure. The packer's structure involves various mechanisms, among which the sealing mechanism and anchoring mechanism are the core of the design. The anchoring mechanism secures the packer to the wellbore or tubing string, preventing axial movement that could affect the sealing performance or cause premature unsealing. The function of the anchoring mechanism is called anchoring. This anchoring effect is mainly achieved by anchor shoes or slips. Slips are divided into unidirectional slips (which only prevent axial movement of the packer in one direction, such as...) Figure 1 (As shown) and two-way slips (which prevent axial movement of the packer in both directions). Two-way slips can be further divided into integral two-way slips (such as...) Figure 2 (As shown) and two one-way chucks, one above and one below.

[0003] Unsealing a packer refers to releasing the packer from its sealed state. Ideally, the packer sleeve and slips should fully retract to their initial positions. For packers with slips, unsealing is one of the design challenges. Generally, the anchoring and unsealing functions of the slips are contradictory; the better the anchoring effect of the slip mechanism, the more difficult it is to unseal.

[0004] The advantage of unidirectional slips is that they are easy to release. A schematic diagram of an existing unidirectional slip anchoring mechanism is shown below. Figure 3 As shown, from Figure 3 As can be seen from the diagram, the one-way slip anchoring mechanism includes a cone, one-way slips, slip seat, release mechanism, and working cylinder installed inside the well casing. Their positional relationships are as follows: Figure 3 As shown in the figure, since the unidirectional slip only has one cone, it is easier to disengage the cone from the slip, thus making unsealing easier. However, its disadvantage is that it can only achieve good anchoring in one direction, affecting the packer's sealing performance.

[0005] A schematic diagram of the existing bidirectional slip anchoring mechanism is shown below. Figure 4 As shown, from Figure 4 As can be seen from the diagram, the bidirectional slip anchoring mechanism includes an upper cone, bidirectional slips, and a lower cone installed inside the well casing, and their positional relationship is as follows: Figure 4As shown in the figure: the advantage of the two-way slip is that the anchoring effect in both directions (axially downward and axially upward) is equally good, resulting in better sealing performance of the packer. However, its disadvantage is the difficulty in slip retrieval during unsealing. Because the two-way slip uses two opposing cones, under a single-direction (axially upward) unsealing load, the two-way slip is difficult to disengage from the lower cone, making unsealing difficult. Figure 5 As shown, the unsealing force F 解 The bidirectional locking reaction force F between the slips and the inner wall of the well casing 反 The problem has been overcome: it cannot effectively disengage the two-way slip from the lower cone. The greater the contact stress between the two-way slip and the lower cone, the greater the ultimate engagement reaction force they generate, making release more difficult.

[0006] To address the problem of the inability to recover bidirectional slips during the unsealing of integral bidirectional slips, there is an urgent need for a modular bidirectional slip anchoring mechanism for downhole packers that is easy to unseal. Summary of the Invention

[0007] To address the problem of the inability to recover slips during the unsealing of integral bidirectional slips, the present invention aims to provide a modular bidirectional slip anchoring mechanism for downhole packers that is easy to unseal. This mechanism has the same good bidirectional anchoring advantages as integral bidirectional slips, and at the same time has the same good ease of unsealing and recovery advantages as unidirectional slips.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A modular bidirectional slip anchoring mechanism includes a bidirectional slip assembly, a working cylinder, an upper cone, a slip sleeve, a lower cone, a first shearing pin, and a second shearing pin;

[0010] The bidirectional slip assembly is disposed on the outer side wall of the working cylinder. The upper cone and the lower cone are respectively positioned above and below the bidirectional slip assembly, and both the upper cone and the lower cone are coaxially and loosely fitted outside the working cylinder. The slip sleeve is coaxially fitted outside the working cylinder, the upper cone, and the lower cone, separating the upper cone and the lower cone. The slip sleeve engages with the bidirectional slip assembly. The first shearing pin is used to fix the working cylinder and the lower cone, and the second shearing pin is used to fix the working cylinder and the slip sleeve.

[0011] Preferably, the bidirectional locking assembly consists of an upper support block, a locking tooth block, an inner locking key, and a lower support block;

[0012] The inner locking key is located between the upper support block and the lower support block, and one end face of the upper support block is tightly fitted and fixed to one end face of the lower support block; the locking tooth block is located on the outside of the upper support block, the inner locking key and the lower support block; the locking sleeve is engaged with both the upper support block and the lower support block.

[0013] Preferably, the upper support block includes an upper support block body, a first inner wedge-shaped groove, a T-shaped opening groove, and a first groove;

[0014] The first inner wedge-shaped groove is provided on the side of the upper support block body near the slip tooth block, and engages with the slip tooth block to form an axial moving pair;

[0015] The T-shaped opening groove is set on the end face of the upper support block body near the inner locking key, and cooperates with the inner locking key;

[0016] The first groove is provided on the upper support block body and matches the slip sleeve;

[0017] The end face of the upper support block near the upper cone is an inclined cone surface, which matches the inclined cone surface of the upper cone.

[0018] Preferably, the lower support block includes a lower support block body, a second inner wedge-shaped groove, an inner wedge-shaped groove, a rectangular opening groove, and a second groove;

[0019] The second inner wedge-shaped groove is provided on the side of the lower support block body near the slip tooth block and cooperates with the slip tooth block.

[0020] The end face of the lower support block near the lower cone is an inclined cone surface, which matches the inclined cone surface of the lower cone.

[0021] The inner wedge-shaped groove is set on the inclined cone surface of the lower support block body and engages with the lower cone.

[0022] The rectangular opening slot is set on the end face of the lower support block body near the inner locking key, and cooperates with the inner locking key;

[0023] The second groove is provided on the lower support block body and matches the slip sleeve.

[0024] Preferably, the inner locking key has an inclined surface on the side opposite to the upper support block and an inclined surface on the side opposite to the lower support block. The inner locking key has external teeth that mesh with the locking tooth block. The inner locking key has a third groove that mates with the T-shaped opening groove of the upper support block. The inner locking key mates with the rectangular opening groove of the lower support block.

[0025] Preferably, the slip block is provided with a first anchoring tooth, a second anchoring tooth, and a third anchoring tooth on the side near the well casing, with the second anchoring tooth positioned between the first and third anchoring teeth; the first anchoring tooth is used to prevent the slip block from moving downwards relative to the well casing; the third anchoring tooth is used to prevent the slip block from moving upwards relative to the well casing; and the second anchoring tooth is used to anchor the slip block to the well casing.

[0026] The side of the slip block away from the well casing is a smooth plane and has a set of internal teeth in the middle that mesh with the internal locking key;

[0027] The radial cross-section of the aforementioned locking tooth block is wedge-shaped, and it engages with the inner wedge shapes of the upper and lower support blocks.

[0028] Preferably, the working cylinder is cylindrical, and a set of long boss keys and a set of short boss keys are provided on the outer wall of the working cylinder, with the long boss keys and short boss keys being evenly and alternately arranged.

[0029] Preferably, the upper cone is cylindrical, and a first conical support groove and a third pin hole are provided on the upper cone;

[0030] The upper cone is coaxially fitted with a clearance fit outside the working cylinder, and the number of the first conical support grooves is the same as the number of the bidirectional slip assembly;

[0031] When axial relative movement between the upper cone and the working cylinder is required, the upper cone and the working cylinder are connected by setting a third shear pin; when axial relative movement between the upper cone and the working cylinder is not required, a threaded connection is used for fixation.

[0032] Preferably, the lower cone is cylindrical, and the inner wall of the lower cone is provided with a fourth groove that cooperates with the long boss key and the short boss key of the working cylinder.

[0033] A set of second conical support grooves is uniformly provided at one end of the lower cone. The number of second conical support grooves is the same as the number of bidirectional clamping components. A wedge-shaped boss is provided on the inclined surface of each second conical support groove. The wedge-shaped boss and the inner wedge-shaped groove of the lower support block are engaged with each other.

[0034] The lower cone is also provided with a set of first pin holes for installing the first shear pin.

[0035] Preferably, the slip sleeve is in the shape of a round tube, and the slip sleeve is coaxially sleeved on the outside of the working cylinder, the upper cone, and the lower cone, and is respectively clearance-fitted with the upper cone and the lower cone; the tube body of the slip sleeve is uniformly provided with square through holes, the number of square through holes being the same as the number of bidirectional slip components, and the bidirectional slip components are installed in the square through holes.

[0036] Preferably, the inner wall of the slip sleeve is provided with a set of inner bosses, the inner bosses and the square through hole are staggered along the circumference, the inner circular surface of the inner bosses and the outer circular surface of the working cylinder are in clearance fit, the inner wall of the inner circle of the inner bosses is provided with a set of fifth grooves, the fifth grooves are in mate with the long boss key of the working cylinder, the inner bosses are provided with a first convex key and a second convex key, the first convex key and the second convex key protrude from the square through hole, the first convex key is engaged in the first groove of the upper support block, the second convex key is engaged in the second groove of the lower support block, and the inner bosses are provided with a second pin hole for installing a second shearing pin in the radial direction;

[0037] In the initial state of the mechanism assembly, the working cylinder has one end face of the long boss key abutting against one end face of the upper cone, and the long boss key passes through the fifth groove of the slip sleeve and the fourth groove of the lower cone; one end face of the short boss key abutting against one end face of the inner boss of the slip sleeve, and the short boss key passes through the fourth groove of the lower cone.

[0038] Preferably, the first shearing pin is a cylindrical pin, the upper part of which is fixed in the first pin hole of the lower cone by threads, and the lower pin head is engaged in the corresponding countersunk hole of the working cylinder.

[0039] The second shearing pin is a cylindrical pin, the upper part of which is fixed in the second pin hole of the slip sleeve by threads, and the lower pin head is engaged in the corresponding countersunk hole of the working cylinder.

[0040] Preferably, before the bidirectional slip assembly is lowered into the well, the lower end face of the upper support block abuts against the upper end face of the lower support block, and the contact surfaces of the two are fixed by a low-load method.

[0041] Preferably, when the upper support block and the lower support block abut, the axial distance L1 between the top surfaces of the upper and lower opposing surfaces of the T-shaped opening groove of the upper support block and the rectangular opening groove of the lower support block has a negative tolerance of the length L2 of the inner key axis, and the negative tolerance is selected as -0.2 to -0.3 mm.

[0042] The distance between the left side of the second convex key of the slip sleeve and the left side of the second groove of the lower support block is L3;

[0043] The reserved gap distance between the right side of the square through hole of the slip sleeve and the right end face of the lower support block is L4, where L4 > L3;

[0044] The clearance distance between the locking tooth block and the limiting surface of the lower support block is L5.

[0045] The beneficial effects of this invention are as follows:

[0046] (1) The anchoring mechanism of the present invention has the same good bidirectional anchoring advantages as the integral bidirectional slip.

[0047] (2) The bidirectional slip assembly of the present invention adopts a modular design. Compared with the integral bidirectional slip, the process of separating the slip teeth from the inner wall of the well casing and separating the slip from the lower cone is completed in two steps instead of one. This eliminates the reaction effect of the slip teeth separating from the inner wall of the casing on the unsealing force, effectively and fully utilizes the unsealing load, and achieves a low unsealing load and a high slip recovery success rate.

[0048] (3) The modular bidirectional slip anchoring mechanism of the present invention adopts a three-step unsealing method. The unsealing load only requires a unidirectional upward force, which is easy to operate on site.

[0049] (4) The modular bidirectional slip anchoring mechanism of the present invention can keep the overall structural dimensions consistent with the integral bidirectional slip, and has good compatibility in improving and upgrading the integral bidirectional slip packer.

[0050] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A diagram of a unidirectional chuck structure from the prior art is shown;

[0053] Figure 2 A diagram of a prior art bidirectional slip structure is shown;

[0054] Figure 3 A diagram of a prior art unidirectional slip anchoring mechanism is shown;

[0055] Figure 4 A diagram of a prior art bidirectional slip anchoring mechanism is shown;

[0056] Figure 5 This diagram illustrates the reasons for the difficulty in unsealing the bidirectional kava in existing technologies.

[0057] Figure 6 A structural diagram of the bidirectional slip assembly of the present invention is shown;

[0058] Figure 7 The schematic diagram of the modular bidirectional slip anchoring mechanism of the present invention is shown.

[0059] Figure 8 A structural diagram of the upper support block of the present invention is shown;

[0060] Figure 9 A structural diagram of the lower support block of the present invention is shown;

[0061] Figure 10 A structural diagram of the internal key of the present invention is shown;

[0062] Figure 11 A structural diagram of the slip block of the present invention is shown;

[0063] Figure 12 A structural diagram of the working cylinder of the present invention is shown;

[0064] Figure 13 A structural diagram of the upper cone of the present invention is shown;

[0065] Figure 14 A structural diagram of the lower cone of the present invention is shown;

[0066] Figure 15 A structural diagram of the slip sleeve of the present invention is shown;

[0067] Figure 16 The diagram shows the dimensional matching requirements and fixing method of the bidirectional slip assembly of the present invention;

[0068] Figure 17 An anchoring effect diagram of the modular bidirectional slip anchoring mechanism of the present invention is shown;

[0069] Figure 18 The diagram illustrates the first step unsealing mechanism of the modular bidirectional slip anchoring mechanism of the present invention;

[0070] Figure 19 The diagram shows the second and third steps of the unsealing mechanism of the modular bidirectional slip anchoring mechanism of the present invention;

[0071] Figure 20 The diagram shows the final unsealing effect achieved by the modular bidirectional slip anchoring mechanism of the present invention.

[0072] In the attached reference numerals: 10-Bidirectional locking assembly, 11-Upper support block, 111-First inner wedge-shaped groove, 112-T-shaped opening groove, 113-First groove, 12-Locking tooth block, 121-First anchoring tooth, 122-Second anchoring tooth, 123-Third anchoring tooth, 124-Inner tooth, 13-Inner key, 131-Outer tooth, 132-Third groove, 14-Lower support block, 141-Second inner wedge-shaped groove, 142-Inner wedge-shaped groove, 143-Rectangular opening groove, 144-Second groove, 20-Working Cylinder, 201-Long boss key, 202-Short boss key, 30-Upper cone, 301-First conical support groove, 302-Third pin hole, 40-Vessel sleeve, 401-Square through hole, 402-Inner boss, 403-Fifth groove, 404-First convex key, 405-Second convex key, 406-Second pin hole, 50-Lower cone, 501-Second conical support groove, 502-Wedge-shaped boss, 503-Fourth groove, 504-First pin hole, 60-First shear pin, 70-Second shear pin. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] like Figure 7 As shown: This invention discloses a modular bidirectional slip anchoring mechanism, including a bidirectional slip assembly 10, a working cylinder 20, an upper cone 30, a slip sleeve 40, a lower cone 50, a first shearing pin 60, and a second shearing pin 70.

[0075] The bidirectional clamping component 10 is disposed on the outer wall of the working cylinder 20. The upper cone 30 and the lower cone 50 are respectively disposed above and below the bidirectional clamping component 10, and the upper cone 30 and the lower cone 50 are coaxially and loosely sleeved on the outside of the working cylinder 20. The clamping sleeve 40 is coaxially sleeved on the outside of the working cylinder 20, the upper cone 30 and the lower cone 50, and separates the upper cone 30 and the lower cone 50. The clamping sleeve 40 is engaged with the bidirectional clamping component 10. The first shearing pin 60 is used to fix the working cylinder 20 and the lower cone 50, and the second shearing pin 70 is used to fix the working cylinder 20 and the clamping sleeve 40.

[0076] In this invention, the bidirectional slip assembly 10 is the core structure of the modular bidirectional slip anchoring mechanism. The working cylinder 20, upper cone 30, slip sleeve 40, lower cone 50, first shear pin 60 and second shear pin 70 are used to realize the bidirectional slip assembly 10 to generate anchoring expansion and unsealing recovery.

[0077] Specifically, the structural diagram of the bidirectional slip assembly 10 is as follows: Figure 6 As shown: The bidirectional locking component 10 consists of an upper support block 11, a locking tooth block 12, an inner locking key 13, and a lower support block 14;

[0078] The inner locking key 13 is disposed between the upper support block 11 and the lower support block 14, and one end face of the upper support block 11 is tightly fitted and fixed to one end face of the lower support block 14; the locking tooth block 12 is disposed on the outside of the upper support block 11, the inner locking key 13 and the lower support block 14; the locking sleeve 40 is engaged with both the upper support block 11 and the lower support block 14.

[0079] Specifically, the structural diagram of the upper support block 11 is as follows: Figure 8 As shown: The upper support block 11 includes an upper support block body, a first inner wedge-shaped groove 111, a T-shaped opening groove 112, and a first groove 113;

[0080] The first inner wedge-shaped groove 111 is provided on the side of the upper support block 11 body near the slip block 12. Figure 8 On the upper top surface of the middle, it engages with the slip block 12 to form an axial moving pair, preventing radial displacement between the slip block 12 and the upper support block 11;

[0081] The T-shaped opening groove 112 is provided on the end face of the upper support block 11 body near the inner locking key 13, and cooperates with the inner locking key 13 (specifically, cooperates with the third groove 132 provided on the inner locking key 13), which can control the inner locking key 13 and the upper support block 11 to produce synchronous movements (when unsealed, the upper external teeth 131 of the inner locking key 13 disengages from the internal teeth 124 on the bottom surface of the locking tooth block 12).

[0082] The first groove 113 is provided on the upper support block body and matches the slip sleeve 40; preferably, a set of first grooves 113 are symmetrically provided on the front and rear sides of the right end of the upper support block body. The first groove 113 matches the first protruding key 404 of the slip sleeve 40. When the slip sleeve 40 moves axially, it can drive the upper support block 11 to move synchronously.

[0083] The end face of the upper support block 11 near the upper cone 30 is a sloping cone surface, which cooperates with the sloping cone surface of the upper cone 30. When the upper cone 30 axially presses the bidirectional slip assembly 10, it causes the bidirectional slip assembly 10 to expand radially outward.

[0084] Specifically, the structural diagram of the lower support block 14 is as follows: Figure 9 As shown: The lower support block 14 includes a lower support block body, a second inner wedge-shaped groove 141, an inner wedge-shaped groove 142, a rectangular opening groove 143, and a second groove 144.

[0085] The second inner wedge-shaped groove 141 is provided on the side of the lower support block 14 body near the slip block 12. Figure 9 The upper top surface of the upper support block 11 is used to cooperate with the slip block 12 to prevent radial displacement between the slip block 12 and the upper support block 11.

[0086] The lower support block 14 is located on the end face near the lower cone 50. Figure 9 The right end bottom surface of the middle part is a sloping cone surface, which matches the sloping cone surface of the lower cone 50. When the lower cone 50 axially presses the bidirectional slip assembly 10, it causes the bidirectional slip assembly 10 to expand radially outward.

[0087] The inner wedge-shaped groove 142 is provided on the inclined cone surface of the lower support block body and engages with the lower cone 50 (specifically, it engages with the outer wedge-shaped protrusion 502 provided on the lower cone 50), so that the lower support block 14 and the lower cone 50 will not separate when sliding along the inclined surface.

[0088] The rectangular opening slot 143 is located on the end face of the lower support block body near the inner locking key 13. Figure 9 On the left end of the middle), it cooperates with the inner key 13. When unsealing, the inner key 13 can move freely in the rectangular opening slot 143 and will not affect the unsealing of the lower support block 14.

[0089] The second groove 144 is provided on the lower support block body and matches the slip sleeve 40. Preferably, a set of second grooves 144 is symmetrically provided on the front and rear sides of the left end of the lower support block body. The second groove 144 matches the second protrusion key 405 of the slip sleeve 40, so that when the slip sleeve 40 moves downward along the axial direction, it can drive the upper support block 11 and the lower support block 14 to move downward in sync. When the slip sleeve 40 moves upward along the axial direction, it can drive the upper support block 11 to move upward in sync and the lower support block 14 to move upward in sync with the lower support block 14.

[0090] Specifically, the structural diagram of the inner key 13 is as follows: Figure 10 As shown, from Figure 10As can be seen, the surface of the inner locking key 13 opposite to the upper support block 11 is an inclined surface, and the surface of the inner locking key 13 opposite to the lower support block 14 is an inclined surface. The two inclined surfaces interact with the upper support block 11 and the lower support block 14 respectively. When the mechanism is in the anchoring state, the two inclined surfaces provide good support and fixation for the inner locking key 13, so that the inner locking key 13 and the locking tooth block 12 are in a stable meshing state.

[0091] The inner locking key 13 is provided with external teeth 131 that mesh with the slip block 12. Preferably, the upper top surface of the inner locking key 13 is provided with a set of external teeth 131 that mesh with the slip block 12. When the inner locking key 13 and the slip block 12 are in the meshing state, it can effectively prevent the slip block 12 from axially sliding relative to the bidirectional slip assembly 10, thereby anchoring the packer firmly in the designated position of the well casing. When the inner locking key 13 and the slip block 12 are in the non-meshing state, the slip block 12 can slide axially relative to the upper support block 11 and the lower support block 14, which is the mechanism by which the modular bidirectional slip is easy to unseal.

[0092] The inner locking key 13 is provided with a third groove 132 that cooperates with the T-shaped opening groove 112 of the upper support block 11. Preferably, a set of third grooves 132 are provided on the front and rear sides of the inner locking key 13. When unsealing, the upper support block 11 drives the inner locking key 13 to disengage the inner locking key 13 from the locking tooth block 12.

[0093] The inner locking key 13 is engaged with the rectangular opening slot 143 of the lower support block 14.

[0094] Specifically, the structural diagram of the kava tooth block 12 is as follows: Figure 11 As shown, the slip block 12 is provided with a first anchoring tooth 121, a second anchoring tooth 122, and a third anchoring tooth 123 on the side near the well casing. The second anchoring tooth 122 is located between the first anchoring tooth 121 and the third anchoring tooth 123. When the anchoring mechanism is in the anchoring working state, the first anchoring tooth 121 is used to prevent the slip block 12 from moving downward relative to the well casing; the third anchoring tooth 123 is used to prevent the slip block 12 from moving upward relative to the well casing; the second anchoring tooth 122 is used to anchor with the well casing and also to prevent the slip block 12 from bending and deforming, thereby ensuring that the inner locking key 13 and the slip block 12 are in a stable meshing state.

[0095] The side of the slip block 12 away from the well casing is a smooth plane and a set of internal teeth 124 that mesh with the internal key 13 are provided in the middle.

[0096] The radial cross-section of the slip block 12 is wedge-shaped, which engages with the inner wedge shape of the upper support block 11 and the lower support block 14, providing good radial motion synchronization. When unsealed, it can also smoothly slide axially relative to the upper support block 11 and the lower support block 14.

[0097] Specifically, the structural diagram of the working cylinder 20 is as follows: Figure 12 As shown, the working cylinder 20 is a cylindrical tube, and a set of long boss keys 201 and a set of short boss keys 202 are provided on the outer wall of the working cylinder 20. The long boss keys 201 and the short boss keys 202 are evenly staggered.

[0098] Specifically, the structural diagram of the upper cone 30 is as follows: Figure 13 As shown, the upper cone 30 is a cylindrical tube and is coaxially fitted with a clearance fit around the working cylinder 20. The upper cone 30 is provided with a first conical support groove 301 and a third pin hole 302.

[0099] Preferably, a set of first conical support grooves 301 are uniformly arranged along the outer wall surface at the right end of the upper cone 30. The first conical support groove 301 is composed of three planes, two of which are parallel and symmetrical about the axis, and the third plane is perpendicular to the other two planes. The third plane is inclined to the left relative to the axis. It is recommended that the inclination angle of the third plane with respect to the axis be set to 10°-25°. The number of the first conical support grooves 301 is the same as the number of the bidirectional slip assembly 10.

[0100] The upper cone 30 and the working cylinder 20 are fixed in a specific way: when the upper cone 30 and the working cylinder 20 need to move axially relative to each other after the mechanism is anchored, the upper cone 30 and the working cylinder 20 are connected by setting a third shear pin at the third pin hole 302; when the upper cone 30 and the working cylinder 20 do not need to move axially relative to each other, they are fixed by setting a threaded connection.

[0101] Specifically, the structural diagram of the lower cone 50 is as follows: Figure 14 As shown, the lower cone 50 is a cylindrical tube and is coaxially fitted with a clearance fit around the working cylinder 20. The inner wall of the lower cone 50 is provided with a fourth groove 503 that cooperates with the long boss key 201 and short boss key 202 of the working cylinder 20 to ensure that it will not rotate when sliding relative to the working cylinder 20.

[0102] A set of second conical support grooves 501 are evenly arranged at one end (left end) of the lower cone 50 (the second conical support groove 501 is composed of three planes, two of which are parallel and symmetrical about the axis, the third plane is perpendicular to the other two planes, the third plane is inclined to the right relative to the axis, and the inclination angle of the third plane with the axis is recommended to be 10°-25°). The number of second conical support grooves 501 is the same as the number of bidirectional slip components 10. A wedge-shaped boss 502 is provided on the inclined surface of each second conical support groove 501. The wedge-shaped boss 502 is engaged with the inner wedge-shaped groove 142 of the lower support block 14 to ensure that the slip component has only one degree of freedom for anchoring outward and unsealing and recycling.

[0103] The lower cone 50 is also provided with a set of first pin holes 504 for installing first shear pins 60. Before the mechanism anchors, the first shear pins 60 serve to fix the lower cone 50 outside the working casing 20. When the mechanism works inside the well casing, the lower cone 50 is set as a frame (stationary relative to the casing), while other components move relative to the lower cone 50.

[0104] Specifically, the structural diagram of the Kawa 40 is as follows: Figure 15 As shown, the slip sleeve 40 is a cylindrical tube. The slip sleeve 40 is coaxially sleeved on the outside of the working cylinder 20, the upper cone 30, and the lower cone 50, and is respectively clearance-fitted with the upper cone 30 and the lower cone 50. The tube body of the slip sleeve 40 is uniformly provided with square through holes 401. The number of square through holes 401 is the same as the number of bidirectional slip components 10. The bidirectional slip components 10 are installed in the square through holes 401.

[0105] The inner wall of the slip sleeve 40 is provided with a set of inner bosses 402. The inner bosses 402 and the square through holes 401 are staggered circumferentially. The front and rear inner surfaces of the inner bosses 402 are flush with the front and rear inner surfaces of the square through holes 401, respectively. The inner circular surface of the inner bosses 402 is clearance-fitted with the outer circular surface of the working cylinder 20. The inner wall of the inner circle of the inner bosses 402 is provided with a set of fifth grooves 403. The fifth grooves 403 mate with the long boss key 201 of the working cylinder 20. The upper support block 11 has a first protruding key 404 and a second protruding key 405. The first protruding key 404 and the second protruding key 405 protrude from the square through hole 401. The first protruding key 404 is engaged in the first groove 113 of the upper support block 11, and the second protruding key 405 is engaged in the second groove 144 of the lower support block 14. The inner boss 402 is provided with a second pin hole 406 for installing the second shear pin 70 in the radial direction. Before the mechanism is anchored, the right end face of the inner boss 402 abuts against the left end face of the short boss key 202.

[0106] When the working cylinder 20 is in the initial state of the mechanism assembly, one end face (left end face) of the long boss key 201 abuts against one end face (right end face) of the upper cone 30, and the long boss key 201 passes through the fifth groove 403 of the slip sleeve 40 and the fourth groove 503 of the lower cone 50; one end face (left end face) of the short boss key 202 abuts against one end face (right end face) of the boss 402 inside the slip sleeve 40, and the short boss key 202 passes through the fourth groove 503 of the lower cone 50.

[0107] Preferably, the first shearing pin 60 is a cylindrical pin, the upper part of which is threaded into the first pin hole 504 of the lower cone 50, and the lower pin head is engaged in the corresponding countersunk hole of the working cylinder 20. When the mechanism performs the anchoring action, the first shearing pin 60 is the first to shear (at the joint between the working cylinder 20 and the lower cone 50), and after shearing, the working cylinder 20 can be axially translated relative to the lower cone 50.

[0108] Preferably, the second shearing pin 70 is a cylindrical pin, the upper part of which is threadedly fixed in the second pin hole 406 of the inner boss 402 of the slip sleeve 40, and the lower pin head is engaged in the corresponding countersunk hole of the working cylinder 20. After the bidirectional slip assembly 10 crawls outward along the inclined surface of the lower cone 50 into place, the second shearing pin 70 is sheared by the reaction force of the bidirectional slip assembly 10 on the slip sleeve 40 (it is sheared at the joint between the working cylinder 20 and the slip sleeve 40, after the first shearing pin 60).

[0109] Preferably, in the initial setup of the bidirectional slip assembly 10 (before the tool is lowered into the well): the lower end face of the upper support block 11 abuts against the upper end face of the lower support block 14, and the contact surfaces are fixed using a low-load method (such as spot welding). The fitting and fixing method of the upper support block 11 and the lower support block 14 is as follows: Figure 16 As shown.

[0110] Preferably, in the initial setup of the slip assembly (before the tool is lowered into the well): the left end bevel of the inner locking key 13 abuts against the bevel of the T-shaped opening slot 112 of the upper support block 11; the right end bevel of the inner locking key 13 abuts against the bevel of the rectangular opening slot 143 of the lower support block 14; the external thread 131 on the inner locking key 13 meshes with the internal thread 124 under the bottom surface of the slip block 12. The left end face of the slip block 12 abuts against the upper support block 11. Figure 16 As shown. To eliminate the influence of machining tolerances, when the upper support block 11 and the lower support block 14 abut, the axial distance L1 between the top surfaces of the upper and lower opposing surfaces of the T-shaped opening groove 112 of the upper support block 11 and the rectangular opening groove 143 of the lower support block 14 should have a negative tolerance equal to the length L2 of the axis of the inner key 13. It is recommended that this negative tolerance be -0.2 to -0.3 mm. Figure 16 As shown. This allows the locking jaw 12 to be completely fixed relative to the bidirectional locking jaw assembly 10.

[0111] Preferably, such as Figure 7 , Figure 8 , Figure 15 As shown, in the modular bidirectional locking mechanism, the first protruding key 404 of the locking sleeve 40 is installed in the first groove 113 of the upper support block 11, and the two are in clearance fit. The movement of the locking sleeve 40 and the upper support block 11 is synchronous. While the locking sleeve 40 pushes the lower support block 14 to move downward and outward, it also simultaneously drives the upper support block 11 to move outward.

[0112] Preferably, such as Figure 7 , Figure 9 , Figure 15 As shown, in the modular bidirectional slip anchoring mechanism, the second protruding key 405 of the slip sleeve 40 is installed in the second groove 144 of the lower support block 14. Before going down into the well, the right side of the second protruding key 405 abuts against the right side of the second groove 144 of the lower support block 14. When the slip sleeve 40 is seated and anchored, it directly pushes the bidirectional slip assembly 10 outward. The distance L3 between the left side of the second protruding key 405 and the left side of the second groove 144 of the lower support block 14 should be sufficient (i.e., L3 should be sufficient to disengage the inner locking key 13 from the locking tooth block 12 when it is retracted): When the lock is unsealed and retracted, the first protruding key 404 of the locking sleeve 40 first moves the upper support block 11 upward, forcibly breaking the weak fixation between the upper support block 11 and the lower support block 14, and disengaging the inner locking key 13. At this time, the left side of the second protruding key 405 contacts the left side of the second groove 144 of the lower support block 14, and the locking sleeve 40 only exerts an unsealing and retraction force on the lower support block 14.

[0113] Preferably, such as 7. Figure 16 As shown, in the modular bidirectional locking mechanism, a gap distance L4 should be reserved between the right side of the square through hole 401 of the locking sleeve 40 and the right end face of the lower support block 14 of the bidirectional locking assembly 10. L4 > L3 is required so that when unsealing, the left side of the second protruding key 405 contacts the left side of the second groove 144 of the lower support block 14 first, while the right side of the square through hole 401 of the locking sleeve 40 does not contact the right end face of the lower support block 14 of the bidirectional locking assembly 10, ensuring that the point of application of the unsealing force is at the left end of the lower support block 14.

[0114] Preferably, such as Figure 7 , Figure 16As shown: In the modular bidirectional slip anchoring mechanism, a sufficient gap distance L5 must be reserved between the limiting surface of the slip block 12 and the lower support block 14 (the limiting surface here refers to the contact surface between the lower support block 14 and the right end face of the slip block 12, which prevents the slip block 12 from sliding out of the bidirectional slip assembly 10. When the right end face of the slip block 12 contacts the limiting surface, it simultaneously forces the slip block 12 to move axially synchronously). (i.e., L5 is sufficient to disengage the slip block 12 from the inner wall of the sleeve). During unsealing, it can ensure that when the slip block 12 is embedded in the inner wall of the sleeve and cannot move, the lower support block 14 can move upward relative to the slip block 12, so that the lower cone 50 loses its effect on the lower support block 14, thereby achieving low-load unsealing (easy unsealing).

[0115] The mechanism of action of the present invention is as follows:

[0116] 1) Coordination before the mechanism is lowered into the well, such as Figure 7 As shown:

[0117] The right end face of the upper support block 11 is tightly fitted (aggregate) with the left end face of the lower support block 14, and the two are initially fixed with sufficient strength (such as spot welding). The inner locking key 13 is installed in the slot between the upper support block 11 and the lower support block 14. Under the tight compression of the upper support block 11 and the lower support block 14, the inner locking key 13 and the locking tooth block 12 are tightly engaged. The upper support block 11, the lower support block 14, the inner locking key 13 and the locking tooth block 12 are tightly assembled into a bidirectional locking assembly 10.

[0118] The upper cone 30 is fitted outside the working cylinder 20, and the right end face of the upper cone 30 abuts against the left end face of the long boss key 201 of the working cylinder 20. The upper cone 30 and the working cylinder 20 are fixed in a specific way (such as with pins or threads) according to the function requirements of the packer. The lower cone 50 is fitted outside the working cylinder 20, and the upper cone 30 and the working cylinder 20 are fixed by the first shearing pin 60. The slip sleeve 40 is fitted outside the working cylinder 20, and the inner boss 402 of the slip sleeve 40 separates the upper cone 30 and the lower cone 50. The right end face of the inner boss 402 of the slip sleeve 40 abuts against the left end face of the long boss key 201 of the working cylinder 20. The left end face of the short boss key 202 of the working cylinder 20 abuts against the first protruding key 404 of the control slip sleeve 40, which is engaged in the first groove 113 of the upper support block 11. The second protruding key 405 of the control slip sleeve 40 is engaged in the second groove 144 of the lower support block 14. The right side of the second protruding key 405 abuts against the right inner side of the second groove 144 of the lower support block 14. The left side of the second protruding key 405 is in a pre-set gap L3 with the left inner side of the second groove 144 of the lower support block 14. The slip sleeve 40 and the working sleeve are fixed by the second shearing pin 70.

[0119] The bidirectional slip assembly 10 is installed in the square through hole 401 of the slip sleeve 40. The left inclined surface abuts against the inclined surface of the upper cone 30, and the right inclined surface abuts against the inclined surface of the lower cone 50. The inner wedge groove 142 of the lower support block 14 is engaged outside the wedge boss 502 of the lower cone 50.

[0120] 2) The process of the mechanism achieving anchorage inside the well:

[0121] (2.1) Before the packer is set, the lower cone 50 of the entire anchoring mechanism is set as the frame of the anchoring mechanism (which is stationary relative to the sleeve);

[0122] (2.2) The upper thrust of the packer acts on the left end face of the working cylinder 20, and the working cylinder 20 transmits the force it receives to the first shear pin 60.

[0123] (2.3) Since the lower cone 50 is set to be fixed, the first shearing pin 60 is sheared under the action of the working cylinder 20 and the reaction force of the lower cone 50.

[0124] (2.4) The working cylinder 20 moves axially downward relative to the lower cone 50. The working cylinder 20 drives the upper cone 30 through a specific fixing method and drives the slip sleeve 40 through the second shearing pin 70. The slip sleeve 40 drives the bidirectional slip assembly 10 through the first convex key 404 and the second convex key 405.

[0125] (2.5) Under the downward thrust of the slip sleeve 40, the bidirectional slip assembly 10 crawls outward along the inclined surface of the lower cone 50 and bites the bidirectional slip assembly 10 onto the inner wall of the sleeve (at this time, the bidirectional slip assembly 10 becomes a stationary fixed part).

[0126] (2.6) As the bidirectional locking component 10 becomes a stationary fixed part, the bidirectional locking component 10 reacts to the locking sleeve 40, and the locking sleeve 40 also becomes a stationary fixed part.

[0127] (2.7) After that, the contact stress between the lower inclined surface of the bidirectional slip assembly 10 and the inclined surface of the lower cone 50 gradually increases, and the reaction force of the second shearing pin 70 on the slip sleeve 40 also increases accordingly, until the second shearing pin 70 is sheared under the action of the working cylinder 20 and the reaction force of the slip sleeve 40. By reasonably setting the shearing load of the second shearing pin 70, sufficient contact stress can be obtained between the lower inclined surface of the bidirectional slip assembly 10 and the inclined surface of the lower cone 50.

[0128] (2.8) As the bidirectional slip assembly 10 moves outward along the inclined surface of the lower cone 50, it moves radially outward in addition to axial movement. At this time, the bidirectional slip assembly 10 is out of contact with the inclined surface of the upper cone 30.

[0129] (2.9) After the second shearing pin 70 is sheared, the working cylinder 20 continues to move axially downward relative to the lower cone 50, the bidirectional slip assembly 10, and the slip sleeve 40. The working cylinder 20 drives the upper cone 30 to move through a specific fixing method between the two, so that the inclined surface of the upper cone 30 resumes contact with the bidirectional slip assembly 10 until the contact stress between the two reaches the design requirements.

[0130] Because the upper and lower inclined surfaces of the slip assembly receive sufficient normal contact stress, the bidirectional slip assembly 10 will produce a good bidirectional anchoring effect, such as... Figure 17 As shown.

[0131] 3) The process of the mechanism unsealing inside the well:

[0132] In actual use, the anchoring mechanism of this downhole packer should be used in conjunction with a locking mechanism (the existing mechanism here) (a locking mechanism to prevent the working cylinder 20 from moving to the left relative to the lower cone 50 after it has been anchored in place, thus preventing self-unsealing). Therefore, before unsealing and retracting the anchoring mechanism, the unsealing tool should be lowered to release the locking mechanism first.

[0133] (3.1) Using the unsealing tool, an upward unsealing load is applied to the working cylinder 20. The long boss key 201 of the working cylinder 20 generates an upward thrust on the upper cone 30. When the upward thrust is greater than the reaction force produced by the contact stress between the inclined surface of the upper cone 30 and the inclined surface of the bidirectional slip assembly 10, the working cylinder 20 and the upper cone 30 move upward synchronously, the upper cone 30 disengages from the bidirectional slip assembly 10, and the anchoring effect of the left half of the bidirectional slip assembly 10 fails. Figure 18 As shown;

[0134] (3.2) The working cylinder 20 and the upper cone 30 continue to move upward, and the left end face of the short boss key 202 of the working cylinder 20 contacts the right end face of the inner boss 402 of the slip sleeve 40, and the unsealing load is applied to the slip sleeve 40.

[0135] (3.3) The slip 40 applies the unsealing load to the upper support block 11 via the first convex key 404. When the unsealing load exceeds the connection strength between the upper support block 11 and the lower support block 14, the upper support block 11 separates from the lower support block 14, and the upper support block 11 slides to the left relative to the slip tooth block 12. Figure 19 As shown;

[0136] (3.4) As the upper support block 11 moves to the left, it also drives the inner locking key 13 to move to the left. When the inner locking key 13 moves to the left, it disengages from the locking jaw block 12. Figure 19 As shown;

[0137] (3.5) When the upper support block 11 slides to the left a distance L3 relative to the slip block 12, the left side of the second protrusion 405 of the slip sleeve 40 contacts the left inner side of the groove of the lower support block 14. The unsealing load is transferred from the slip sleeve 40 to the lower support block 14. At this time, the lower support block 14 generates two frictional forces due to the contact surface stress of the slip block 12 and the contact surface stress of the lower cone 50. When the unsealing load is greater than the two frictional forces, the lower support block 14 moves to the left relative to the slip block 12. Once the lower support block 14 moves to the left, the contact stress between the lower support block 14 and the lower cone 50 and the contact stress between the lower support block 14 and the slip block 12 are greatly reduced. After that, only a very small force is needed to continue to move the support block to the left. Figure 19 As shown;

[0138] (3.6) When the lower support block 14 moves to the left, since the slip block 12 is wedge-shaped and embedded in the lower support block 14, the lower support block 14 drives the slip block 12 to retract radially. The slip block 12 does not need to move to the left, but only retracts radially. In this way, the slip block 12 will never generate a reaction force to resist the unsealing load. This is the mechanism by which the mechanism can achieve low-load unsealing.

[0139] (3.7) When the lower support block 14 moves to the left and contacts the right end face of the slip block 12, the slip block 12 will move to the left synchronously. Therefore, the length of L5 needs to be sufficient (so that the slip block 12 disengages from the inner wall of the sleeve).

[0140] (3.8) The working cylinder 20 drives the upper cone 30 and the slip sleeve 40, the slip sleeve 40 drives the upper support block 11 and the lower support block 14, and the lower support block 14 drives the slip tooth block 12, completing the unsealing and recovery process in the reverse direction of the setting and anchoring, ultimately achieving... Figure 20 The state. After unsealing and recycling, the distance between the left end face of the upper support block 11 and the right end face of the lower support block 14 increased from L6 to L3, as shown. Figure 19 As shown.

[0141] The final result of the lockdown is shown in the image. Figure 20 As shown above, the bidirectional slip assembly in the modular bidirectional slip anchoring mechanism of the present invention is as easy to unseal as the unidirectional slip in the prior art.

[0142] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular bi-directional slip anchoring mechanism, characterized by: The application relates to a double-direction slip assembly, which comprises a double-direction slip assembly (10), a working barrel (20), an upper cone (30), a slip sleeve (40), a lower cone (50), a first shear pin (60) and a second shear pin (70). The double-direction slip assembly (10) is arranged on the outer wall of the working barrel (20), the upper cone (30) and the lower cone (50) are arranged above and below the double-direction slip assembly (10) respectively, the upper cone (30) and the lower cone (50) are coaxially and gap-set on the working barrel (20), the slip sleeve (40) is coaxially sleeve-set on the outer sides of the working barrel (20), the upper cone (30) and the lower cone (50) and separates the upper cone (30) and the lower cone (50), the slip sleeve (40) is in clamping connection with the double-direction slip assembly (10), the first shear pin (60) is used for fixing the working barrel (20) and the lower cone (50), and the second shear pin (70) is used for fixing the working barrel (20) and the slip sleeve (40). The double-direction slip assembly (10) is composed of an upper supporting block (11), a slip tooth block (12), an inner clamping key (13) and a lower supporting block (14). The inner clamping key (13) is arranged between the upper supporting block (11) and the lower supporting block (14), one end surface of the upper supporting block (11) is tightly combined with one end surface of the lower supporting block (14) and is fixed, the slip tooth block (12) is arranged on the outer sides of the upper supporting block (11), the inner clamping key (13) and the lower supporting block (14), and the slip sleeve (40) is in clamping connection with the upper supporting block (11) and the lower supporting block (14). The upper supporting block (11) comprises an upper supporting block body and a first groove (113), and the first groove (113) is arranged on the upper supporting block body and matched with the slip sleeve (40). The lower supporting block (14) comprises a lower supporting block body and a second groove (144), and the second groove (144) is arranged on the lower supporting block body and matched with the slip sleeve (40). The working barrel (20) is in a circular tube shape, a group of long boss keys (201) and a group of short boss keys (202) are arranged on the outer wall of the working barrel (20), and the long boss keys (201) and the short boss keys (202) are uniformly and staggeredly arranged. The slip sleeve (40) is in a circular tube shape, the slip sleeve (40) is coaxially sleeve-set on the outer sides of the working barrel (20), the upper cone (30) and the lower cone (50) and is in gap connection with the upper cone (30) and the lower cone (50) respectively, square through holes (401) are uniformly arranged on the pipe body of the slip sleeve (40), the number of the square through holes (401) is consistent with the number of the double-direction slip assembly (10), and the double-direction slip assembly (10) is installed in the square through holes (401). The inner wall of the slip sleeve (40) is provided with a group of inner bosses (402), the inner bosses (402) are arranged along the circumference and are staggered with the square through hole (401), the inner circle surface of the inner boss (402) is gap-fitted with the outer circle surface of the working barrel (20), the wall surface of the inner circle of the inner boss (402) is provided with a group of fifth grooves (403), the fifth grooves (403) are matched with the long boss key (201) of the working barrel (20), the inner boss (402) is provided with a first key (404) and a second key (405), the first key (404) and the second key (405) are inwardly protruded in the square through hole (401), the first key (404) is clamped in the first groove (113) of the upper support block (11), the second key (405) is clamped in the second groove (144) of the lower support block (14), the inner boss (402) is provided with a second pin hole (406) for installing the second shear pin (70) in the radial direction; Wherein, when the working barrel (20) is in the initial state of mechanism assembly, one end surface of the long boss key (201) is abutted with one end surface of the upper cone (30), the long boss key (201) penetrates in the fifth groove (403) of the slip sleeve (40) and the fourth groove (503) of the lower cone (50); one end surface of the short boss key (202) is abutted with one end surface of the inner boss (402) of the slip sleeve (40), the short boss key (202) penetrates in the fourth groove (503) of the lower cone (50); The distance between the left side surface of the second key (405) of the slip sleeve (40) and the left side surface of the second groove (144) of the lower support block (14) is L3; The gap distance reserved between the slip block (12) and the limiting surface of the lower support block (14) is L5.

2. The modular sliding sleeve anchor of claim 1, wherein: The upper support block (11) further comprises a first inner wedge-shaped clamping groove (111) and a T-shaped opening groove (112); Wherein, the first inner wedge-shaped clamping groove (111) is arranged on the side surface of the upper support block body close to the slip block (12), and is clamped and matched with the slip block (12) to form an axial moving pair; The T-shaped opening groove (112) is arranged on the end surface of the upper support block body close to the inner key (13), and is matched with the inner key (13); The end surface of the upper support block (11) close to the upper cone (30) is a beveled cone surface, and is matched with the beveled cone surface of the upper cone (30).

3. The modular sliding sleeve anchor of claim 2, wherein: The lower support block (14) further comprises a second inner wedge-shaped clamping groove (141), an inner wedge-shaped groove (142) and a rectangular opening groove (143); Wherein, the second inner wedge-shaped clamping groove (141) is arranged on the side surface of the lower support block body close to the slip block (12), and is matched with the slip block (12); The end surface of the lower support block (14) close to the lower cone (50) is a beveled cone surface, and is matched with the beveled cone surface of the lower cone (50); The inner wedge-shaped groove (142) is arranged on the beveled cone surface of the lower support block body, and is clamped and matched with the lower cone (50); The rectangular opening groove (143) is arranged on the end face of the lower support block body close to the inner key (13) and cooperates with the inner key (13).

4. The modular sliding sleeve anchor of claim 3, wherein: The surface of the inner key (13) opposite to the upper support block (11) is a bevel surface, the surface of the inner key (13) opposite to the lower support block (14) is a bevel surface, the inner key (13) is provided with outer teeth (131) which are engaged with the slip teeth block (12), the inner key (13) is provided with a third groove (132) which cooperates with the T-shaped opening groove (112) of the upper support block (11), and the inner key (13) cooperates with the rectangular opening groove (143) of the lower support block (14).

5. The modular sliding sleeve anchor of claim 4, wherein: The surface of the slip teeth block (12) close to the wellbore casing is provided with a first anchoring tooth (121), a second anchoring tooth (122) and a third anchoring tooth (123), and the second anchoring tooth (122) is arranged between the first anchoring tooth (121) and the third anchoring tooth (123); the first anchoring tooth (121) is used to prevent the slip teeth block (12) from moving downward relative to the wellbore casing; the third anchoring tooth (123) is used to prevent the slip teeth block (12) from moving upward relative to the wellbore casing; and the second anchoring tooth (122) is used to realize anchoring with the wellbore casing. The surface of the slip teeth block (12) away from the wellbore casing is a smooth surface, and a group of inner teeth (124) which are engaged with the inner key (13) are arranged in the middle of the surface. The radial section of the slip teeth block (12) is wedge-shaped and is engaged with the inner wedge-shaped surface of the upper support block (11) and the lower support block (14).

6. The modular sliding sleeve anchor of claim 1, wherein: The upper cone (30) is in the shape of a circular tube, and the upper cone (30) is provided with a first conical support groove (301) and a third pin hole (302). The upper cone (30) is coaxially and gap-fittingly arranged on the outer wall of the working barrel (20), and the number of the first conical support grooves (301) is consistent with the number of the bidirectional slip assembly (10). When the upper cone (30) needs to axially move relative to the working barrel (20), the upper cone (30) is connected with the working barrel (20) through the third shear pin; and when the upper cone (30) does not need to axially move relative to the working barrel (20), the upper cone (30) is fixedly connected with the working barrel (20) through screw connection.

7. The modular sliding sleeve anchor of claim 6, wherein: The lower cone (50) is in the shape of a circular tube, and the inner wall of the lower cone (50) is provided with a fourth groove (503) which cooperates with the long boss key (201) and the short boss key (202) of the working barrel (20). One end of the lower cone (50) is uniformly provided with a group of second conical support grooves (501), and the number of the second conical support grooves (501) is consistent with the number of the bidirectional slip assembly (10); a wedge-shaped boss (502) is arranged on the bevel surface of each second conical support groove (501), and the wedge-shaped boss (502) is engaged with the inner wedge-shaped groove (142) of the lower support block (14). The lower cone (50) is further provided with a group of first pin holes (504) for installing the first shear pin (60).

8. The modular sliding sleeve anchor of claim 1, wherein: The first shear pin (60) is a cylindrical pin, the upper part of which is fixed in the first pin hole (504) of the lower cone (50) by screw thread, and the lower pin head is clamped in the corresponding counterbore of the working barrel (20); The second shear pin (70) is a cylindrical pin, the upper part of which is fixed in the second pin hole (406) of the slip sleeve (40) by screw thread, and the lower pin head is clamped in the corresponding counterbore of the working barrel (20).

9. The modular sliding sleeve anchor of any of claims 1-8, wherein: Before the bidirectional slip assembly (10) is lowered into the well, the lower end surface of the upper support block (11) abuts against the upper end surface of the lower support block (14), and the contact surfaces of the two abut against each other by a low-load fixing mode.

10. The modular sliding sleeve anchor of claim 1, wherein: When the upper support block (11) abuts against the lower support block (14), the axial distance L1 between the top surfaces of the upper and lower surfaces of the T-shaped opening groove (112) of the upper support block (11) and the rectangular opening groove (143) of the lower support block (14) is a negative tolerance of the inner key (13) axial length L2, and the negative tolerance is selected to be -0.2-0.3 mm. The reserved gap distance between the right side surface of the square through hole (401) of the slip sleeve (40) and the right end surface of the lower support block (14) is L4, and L4>L3.

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