A soluble bridge plug with a bidirectional slip and a preparation method thereof

Abstract

The application discloses a soluble bridge plug with a bidirectional slip and a preparation method thereof. The soluble bridge plug comprises a center pipe with a limiting part at one end, two sets of slip assemblies sleeved on the center pipe, a cup assembly sleeved on the center pipe and located between the two sets of slip assemblies, and a push cylinder sleeved on the center pipe. One end of one set of slip assemblies is in abutment with the limiting part, and the other end is in abutment with one end of the cup assembly. The other end of the cup assembly is in abutment with one end of the other set of slip assemblies, and the other end of the other set of slip assemblies is in abutment with one end of the push cylinder. Each set of slip assemblies comprises a slip, which is a pair of cylindrical annular structures, and a slip gasket ring arranged between the pair of slips. The two ends of the slip are inwardly recessed to form a first inclined surface, and the two ends of the slip gasket ring are outwardly protruded to form a second inclined surface matched with the first inclined surface. The structure of the cup assembly arranged between the two sets of slip assemblies is adopted, and the structures of the slip assembly and the cup assembly are optimized, so that the pressure-bearing capacity and the plugging effect of the soluble bridge plug are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling technology, and particularly relates to a soluble bridge plug and a preparation method thereof. BACKGROUND

[0002] The soluble bridge plug is used for temporarily plugging oil, gas, water and leakage layers, and high-pressure fracturing operation can be performed on the upper production layer of the soluble bridge plug. After the fracturing operation is completed, the bridge plug is automatically dissolved under the condition of liquid and temperature in the well, and full passage of the production casing is provided. At present, the tool is mainly applied to shale gas well formation reconstruction. The existing soluble bridge plug has the problems of unstable structure, weakened plugging effect or failure under high pressure due to the structure assembly form, and it is necessary to improve it. SUMMARY

[0003] In view of the above problems in the prior art, the present application provides a soluble bridge plug and a preparation method thereof, which improves the bridge plug structure, sets a leather cup assembly between two sets of slip assemblies, optimizes the structure of the slip assembly and the leather cup assembly, and improves the pressure-bearing capacity and plugging effect of the soluble bridge plug.

[0004] In order to achieve the purpose of the present application, the following scheme is adopted:

[0005] A soluble bridge plug comprises:

[0006] a center pipe having a limiting portion at one end;

[0007] two sets of slip assemblies, which are sleeved on the center pipe and are arranged at intervals;

[0008] a leather cup assembly, which is sleeved on the center pipe and is located between the two sets of slip assemblies;

[0009] a push cylinder, which is sleeved on the center pipe;

[0010] One end of one set of slip assemblies abuts against the limiting portion, and the other end abuts against one end of the leather cup assembly. The other end of the leather cup assembly abuts against one end of the other set of slip assemblies, and the other end of the other set of slip assemblies abuts against one end of the push cylinder.

[0011] Each set of slip assemblies comprises:

[0012] a slip, which has a cylindrical annular structure, is arranged at intervals, and has a pair of slip teeth arranged in an array on the outer surface in the circumferential direction;

[0013] a slip grommet, which is arranged between the pair of slips;

[0014] The two ends of the slip are inwardly recessed to form a first inclined surface, and the two ends of the slip grommet are outwardly protruded to form a second inclined surface matched with the first inclined surface;

[0015] The limiting part is outwardly protruded with a fifth inclined surface at the end face of the other end of the central pipe, and the fifth inclined surface is used for cooperating with the first inclined surface of the slip.

[0016] The top surface of the slip teeth of the slip assembly near the pushing cylinder is inclined towards the direction of the rubber bowl assembly, and the top surface of the slip teeth of the slip assembly near the limiting part is inclined towards the direction of the rubber bowl assembly, that is, the slip teeth of the two groups of slip assemblies are opposite to each other and both are towards the middle.

[0017] The pushing cylinder is formed with a third inclined surface at one end, and the third inclined surface cooperates with the first inclined surface of the slip.

[0018] The slip teeth are made of hard alloy particles.

[0019] The rubber bowl assembly comprises:

[0020] The rubber bowl seats are provided in pairs and are arranged at intervals, and the end face of the rubber bowl seats outwardly protruding from the abutting end of the slip assembly is formed with a fourth inclined surface, and the fourth inclined surface cooperates with the first inclined surface of the slip.

[0021] The plurality of rubber bowl pieces are arranged between the pair of rubber bowl seats, and the rubber bowl piece comprises a rubber bowl and a rubber bowl gasket arranged at the top opening of the rubber bowl.

[0022] The top opening of the rubber bowl is arranged towards the other end of the central pipe.

[0023] A preparation method of a dissolvable bridge plug, comprising the steps of:

[0024] S100, providing a central pipe, two groups of slip assemblies, a rubber bowl assembly, and a pushing cylinder, and the central pipe is provided with a limiting part at one end;

[0025] S200, sleeving the first group of slip assemblies on the central pipe, and making one end of the first group of slip assemblies abut against the limiting part;

[0026] S300, sleeving the rubber bowl assembly on the central pipe, and making one end of the rubber bowl assembly abut against the other end of the first group of slip assemblies;

[0027] S400, sleeving the second group of slip assemblies on the central pipe, and making one end of the second group of slip assemblies abut against the other end of the rubber bowl assembly;

[0028] S500, sleeving the pushing cylinder on the central pipe, and making one end of the pushing cylinder abut against the other end of the second group of slip assemblies, and the preparation of the dissolvable bridge plug is completed.

[0029] Each set of slip assembly comprises: a pair of slips, a slip gasket, the slip is a cylindrical annular structure, the outer surface is provided with slip teeth in circumferential array, the two ends of the slip are inwardly recessed to form a first inclined surface, the two ends of the slip gasket are outwardly protruded to form a second inclined surface, the second inclined surface is used for cooperating with the first inclined surface; the one end of the push cylinder is formed with a third inclined surface, the third inclined surface is used for cooperating with the first inclined surface of the slip; the leather cup assembly comprises: a pair of leather cup seats, a plurality of leather cup pieces, the one end of the leather cup seat is outwardly protruded to form a fourth inclined surface, the fourth inclined surface is used for cooperating with the first inclined surface of the slip, the leather cup piece comprises a leather cup and a leather cup gasket; the limiting portion is outwardly protruded to form a fifth inclined surface on the end face of the other end of the central tube, and the fifth inclined surface is used for cooperating with the first inclined surface of the slip.

[0030] Further, the step S200 comprises:

[0031] The central tube is clamped by the clamping mechanism and the limiting portion of the central tube to keep the central tube in a horizontal state;

[0032] The first slip of the first set of slip assembly, a slip gasket and the second slip are sequentially sleeved on the central tube from the other end of the central tube;

[0033] Then, the horizontal pushing mechanism is used for pushing, and the second slip is acted on, so that the first inclined surface of the one end of the second slip is attached to the second inclined surface of the one end of the slip gasket, the second inclined surface of the other end of the slip gasket is attached to the first inclined surface of the one end of the first slip, and the first inclined surface of the other end of the first slip is attached to the fifth inclined surface of the limiting portion, and then the horizontal pushing mechanism is retracted;

[0034] The step S300 comprises:

[0035] The first leather cup seat of the leather cup assembly, a plurality of leather cup pieces and the second leather cup seat are sequentially sleeved on the central tube from the other end of the central tube;

[0036] Then, the horizontal pushing mechanism is used for pushing, and the second leather cup seat is acted on, so that the components of the leather cup assembly are abutted with each other, and the fourth inclined surface of the first leather cup seat of the leather cup assembly is attached to the first inclined surface of the other end of the second slip of the first set of slip assembly, and then the horizontal pushing mechanism is retracted;

[0037] The step S400 comprises:

[0038] The first slip of the second set of slip assembly, a slip gasket and the second slip are sequentially sleeved on the central tube from the other end of the central tube;

[0039] Then the horizontal pushing mechanism is used for pushing, the first inclined surface of the first slip of the second slip assembly is matched with the fourth inclined surface of the second bowl seat of the bowl assembly, and then the horizontal pushing mechanism is retracted.

[0040] The step S500 comprises:

[0041] The pushing barrel is sleeved on the central pipe, and then the horizontal pushing mechanism is used for pushing, the one end of the pushing barrel is matched with the outer end of the second slip of the second slip assembly, and the third inclined surface is matched with the first inclined surface of the second slip.

[0042] The central pipe is clamped by the clamping mechanism on the limiting part of the central pipe, and the central pipe is clamped, comprising the steps of:

[0043] The limiting part of the central pipe is horizontally placed between a pair of arc-shaped clamping plates which are spaced and oppositely arranged, wherein the arc-shaped clamping plates are respectively slidably fitted in the vertical sliding grooves of the support, each arc-shaped clamping plate is connected with the movable end of a vertical oil cylinder, and the vertical oil cylinder is connected to the support; the inner side end of the arc-shaped clamping plate is provided with a limiting plate, and the limiting part is placed in abutment with the limiting plate;

[0044] Then the movable end of the vertical oil cylinder acts on the arc-shaped clamping plate to make the arc-shaped clamping plate clamp the limiting part stably and horizontally.

[0045] The horizontal pushing mechanism is used for pushing, specifically, a pair of horizontal pushing cylinders arranged on the column are used to push the pushing ring connected to the movable end of the horizontal pushing cylinder towards the central pipe, so that the pushing ring passes through the end of the central pipe and acts on the object to be pushed.

[0046] The beneficial effects of the present application are:

[0047] The structure of the bowl assembly arranged between the two slip assemblies is adopted, and the structure of the slip assembly and the bowl assembly is optimized, so that the pressure bearing capacity and sealing effect of the soluble bridge plug are improved.

[0048] The slip assembly comprises a pair of slips and slip gaskets, and the matching and abutting are realized through the action of the inclined surface, which is used to respond to the force and bite and grip the casing wall through the action of the slip teeth, and the two slip assemblies act on four positions of the casing wall, and multiple points act at each position, so that the bite positioning effect is improved; the bowl assembly is provided with a plurality of bowl pieces between a pair of bowl seats, each bowl piece comprises a bowl and a bowl gasket, and can realize sealing when responding to the force from the two ends of the two slip assemblies, so that the pressure bearing effect is good.

[0049] The bridge plug has a simple structure, and all parts are sleeved on the central tube. It is easy to install, has a small number of parts, a simple structure, and is easy to process, which can save costs and improve efficiency. It is assembled and prepared through a clamping mechanism and a horizontal pushing mechanism, which can improve assembly efficiency and structural stability after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a three-dimensional diagram of the overall structure of an embodiment of the present application.

[0051] Figure 2 This is a front view of the overall structure of an embodiment of the present application.

[0052] Figure 3 This is a cross-sectional view of the overall structure of an embodiment of the present application.

[0053] Figure 4 This is a three-dimensional view of the central tube of an embodiment of the present application.

[0054] Figure 5 This is an exploded view of the slip assembly and push cylinder of an embodiment of the present application.

[0055] Figure 6 This is an exploded view of the leather cup assembly according to an embodiment of the present application.

[0056] Figure 7 This is a three-dimensional diagram of the clamping mechanism and horizontal pushing mechanism of an embodiment of the present application. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0058] The present application embodiment provides a soluble bridge plug, such as Figure 1 As shown, it comprises: a central tube 1, two sets of slip assemblies 2, a leather cup assembly 3, and a push cylinder 4. The central tube 1 has a stopper 11 at one end; the two sets of slip assemblies 2 are sleeved on the central tube 1, spaced apart; the leather cup assembly 3 is sleeved on the central tube 1 and located between the two sets of slip assemblies 2; and the push cylinder 4 is sleeved on the central tube 1. One end of one set of slip assemblies 2 abuts against the stopper 11, and the other end abuts against one end of the leather cup assembly 3. The other end of the leather cup assembly 3 abuts against one end of the other set of slip assemblies 2, and the other end of the other set of slip assemblies 2 abuts against one end of the push cylinder 4.

[0059] Specifically, such as Figures 2-6 As shown:

[0060] Each group of slip assemblies 2 includes: a pair of slips 21 and slip washers 22. The slips 21 are cylindrical annular structures, arranged at intervals, and their outer surfaces are provided with slip teeth 23 in a circumferential array. The slip teeth 23 are hard alloy particles of ∅7*H5. Each slip 21 has 12 slip teeth 23, which are embedded in the slip 21. The slip 21 body is made of a soluble metal material with a ductility greater than 30%. The slip washers 22 are arranged between the pair of slips 21; the two ends of the slips 21 are concave inward to form a first inclined surface 211, and the two ends of the slip washers 22 are convex outward to form a second inclined surface 221 that cooperates with the first inclined surface 211; the end surface of the limiting portion 11 facing the other end of the central tube 1 is convex outward to form a fifth inclined surface 111, and the fifth inclined surface 111 is used to cooperate with the first inclined surface 211 of the slip 21.

[0061] A third inclined surface 41 is formed at one end of the push cylinder 4 , and the third inclined surface 41 cooperates with the first inclined surface 211 of the slip 21 .

[0062] The cup assembly 3 comprises a pair of cup seats 31 and multiple cup components. The cup seats 31 are spaced apart. The outwardly facing protrusions on the end surfaces of the cup seats 31 that abut the slip assembly 2 are formed with fourth inclined surfaces 311, which mate with the first inclined surfaces 211 of the slip 21. Multiple cup components are positioned between the cup seats 31. These components include a cup 32 and a cup gasket 33 positioned at the top of the cup 32. The cup 32 is made of soluble rubber, with its top facing the other end of the center tube 1, that is, toward the push cylinder 4.

[0063] The method for preparing the soluble bridge plug comprises the following steps:

[0064] S100, providing a central tube 1, two sets of slip assemblies 2, a leather cup assembly 3, and a push cylinder 4, wherein one end of the central tube 1 has a limiting portion 11.

[0065] S200 , sleeve the first set of slip assemblies 2 on the central pipe 1 , and make one end of the first set of slip assemblies 2 abut against the limiting portion 11 .

[0066] Specifically: Figure 7 As shown, the limiting portion 11 of the central tube 1 is placed horizontally between a pair of arc-shaped clamps 53 spaced apart and arranged opposite to each other, wherein the arc-shaped clamps 53 are respectively slidably fitted in the vertical slide grooves 52 of the bracket 51, and each arc-shaped clamp 53 is respectively connected to the movable end of a vertical oil cylinder 54, and the vertical oil cylinder 54 is connected to the bracket 51; the inner end of the arc-shaped clamp 53 has a limiting plate 531, and the limiting portion 11 is placed in contact with the limiting plate 531; then the movable end of the vertical oil cylinder 54 acts on the arc-shaped clamp 53, so that the arc-shaped clamp 53 clamps the limiting portion 11 firmly and keeps it horizontal.

[0067] Then, the clamping mechanism is used to clamp the limiting part 11 of the center tube 1 to clamp the center tube 1 and keep the center tube 1 in a horizontal state; the first cava 21, a cava gasket 22, and the second cava 21 of the first group of cava assemblies 2 are sequentially mounted on the center tube 1 from the other end; then the horizontal pushing mechanism 6 is used to push the second cava 21, so that the first inclined surface 211 at one end of the second cava 21 is fitted with the second inclined surface 221 at one end of the cava gasket 22, the second inclined surface 221 at the other end of the cava gasket 22 is fitted with the first inclined surface 211 at one end of the first cava 21, and the first inclined surface 211 at the other end of the first cava 21 is fitted with the fifth inclined surface of the limiting part 11, and then the horizontal pushing mechanism 6 is retracted.

[0068] Among them, the pushing is performed by using a horizontal pushing mechanism 6, specifically, a pair of horizontal pushing cylinders 62 arranged on the column 63 are used to push the pushing ring 61 connected to the movable end of the horizontal pushing cylinder 62 toward the central tube 1, so that the pushing ring 61 passes through the end of the central tube 1 and acts on the object to be pushed.

[0069] S300 , sleeve the leather cup assembly 3 on the central tube 1 , and make one end of the leather cup assembly 3 abut against the other end of the first group of slip assemblies 2 .

[0070] Specifically: Figure 7 As shown, the first leather cup seat 31, multiple leather cup parts, and the second leather cup seat 31 of the leather cup assembly 3 are sequentially mounted on the center tube 1 from the other end of the center tube 1; then the horizontal pushing mechanism 6 is used to push the second leather cup seat 31, so that the components of the leather cup assembly 3 abut against each other, and the fourth inclined surface 311 of the first leather cup seat 31 of the leather cup assembly 3 is fitted with the first inclined surface 211 at the other end of the second cava 21 of the first group of cava assembly 2, and then the horizontal pushing mechanism 6 is retracted.

[0071] S400 , sleeve the second set of slip components 2 on the central tube 1 , and make one end of the second set of slip components 2 abut against the other end of the leather cup component 3 .

[0072] Specifically: Figure 7 As shown, the first cava 21, a cava gasket 22, and the second cava 21 of the second group of cava components 2 are sequentially mounted on the center tube 1 from the other end of the center tube 1; then the horizontal pushing mechanism 6 is used to push the second cava 21 of the second group of cava components 2, so that the components of the second group of cava components 2 abut against each other, and the first inclined surface 211 of the first cava 21 of the second group of cava components 2 facing one end of the leather cup component 3 is fitted with the fourth inclined surface 311 of the second leather cup seat 31 of the leather cup component 3, and then the horizontal pushing mechanism 6 is retracted.

[0073] S500, sleeve the push tube 4 on the central tube 1, as shown in FIG. Figure 7As shown, the push cylinder 4 is then pushed by the horizontal pushing mechanism 6, so that one end of the push cylinder 4 abuts against the outer end of the second slip 21 of the second slip assembly 2, the third inclined surface 41 abuts against the first inclined surface 211 of the second slip 21, and then the horizontal pushing mechanism 6 is retracted, thereby completing the preparation of the dissolvable bridge plug.

[0074] During operation, the outer end surface of the push cylinder 4 is subjected to a pushing force, and all the parts installed between the limiting portion 11 and the push cylinder 4 are subjected to the pushing force, which is finally transmitted to the limiting portion 11 of the central tube 1. Since the rubber cup 32 is made of rubber and has low strength, it first expands outward and increases in outer diameter under the pushing force, and finally abuts against the casing outside the bridge plug. With the increase of the pushing force, the slip 21 expands outward along the first inclined surface 211 at an angle of 45 degrees, and finally abuts against the inner wall of the casing. Since the outer circle of the slip 21 is inlaid with hard alloy slip teeth 23 with sharp corners, the tooth tips of the slip teeth 23 are pressed into the inner wall of the casing. The slip teeth 23 are arranged at an angle, and the tooth tips of the slip teeth 23 on the side close to the push cylinder 4 are arranged to face the push cylinder 4, and the tooth tips of the slip teeth 23 on the side close to the limiting portion 11 of the central tube 1 are arranged to face the limiting portion 11. When the force acting on the outer end surface of the push cylinder 4 is removed, since the slip teeth 23 are engaged with the inner wall of the casing, the rubber cup 32 cannot be retracted, and will continue to abut against the casing wall, thereby maintaining the sealing ability.

[0075] The outer circle of the slip 21 is inlaid with 12 hard alloy particles as the slip teeth 23, and the slip 23 is made of a dissolvable metal material with a ductility greater than 30%. When the slip 23 is subjected to an axial pushing force of the inner inclined surface, it will expand outward until it abuts against the casing.

[0076] The rubber cup 32 is made of dissolvable rubber, and the rubber cup 32 is arranged to face the push cylinder 4. The greater the hydraulic pressure from the side of the push cylinder 4, the tighter the rubber cup 32 abuts against the casing, and the stronger the sealing ability.

[0077] The above is only a preferred embodiment of the present application, and does not mean the only or limit the present application. Those skilled in the art should understand that various changes or equivalent replacements made to the present application without departing from the scope of the present application, all belong to the scope of protection of the present application.

Claims

1. A soluble bridge plug with bidirectional slips, characterized in that: include: A central tube (1), one end of which has a limiting portion (11); Two sets of slip assemblies (2) are sleeved on the central tube (1) and spaced apart; A leather cup assembly (3) is sleeved on the central tube (1) and is located between the two sets of slip assemblies (2); A push cylinder (4) is sleeved on the central tube (1); One end of one set of slip assemblies (2) abuts against the limiting portion (11), and the other end abuts against one end of the leather cup assembly (3); the other end of the leather cup assembly (3) abuts against one end of another set of slip assemblies (2); and the other end of the other set of slip assemblies (2) abuts against one end of the push cylinder (4); Each set of slip assemblies (2) comprises: slips (21) in a cylindrical annular structure, a pair of slips arranged at intervals, and slip teeth (23) arranged in a circumferential array on the outer surface thereof; A slip ring (22) is provided between a pair of slips (21); Both ends of the slip (21) are recessed inward to form a first inclined surface (211), and both ends of the slip gasket (22) are protruded outward to form a second inclined surface (221) that matches the first inclined surface (211). The end surface of the limiting portion (11) facing the other end of the central tube (1) is protruded outward to form a fifth inclined surface (111), and the fifth inclined surface (111) is used to cooperate with the first inclined surface (211) of the slip (21); The leather cup assembly (3) comprises: a pair of leather cup seats (31) spaced apart, the end faces of the leather cup seats (31) abutting against the slip assembly (2) forming a fourth inclined surface (311) on the outward convex platform, the fourth inclined surface (311) cooperating with the first inclined surface (211) of the slip (21); A plurality of leather cup parts are arranged between a pair of leather cup seats (31), and the leather cup parts include a leather cup (32) and a leather cup gasket (33) arranged at the top of the leather cup (32); The top of the leather cup (32) is arranged toward the other end of the center tube (1); A third inclined surface (41) is formed at one end of the push cylinder (4), and the third inclined surface (41) cooperates with the first inclined surface (211) of the slip (21); The slip teeth (23) are hard alloy particles.

2. A method for preparing a soluble bridge plug with bidirectional slips as claimed in claim 1, characterized in that: Including steps: S100, providing a central tube (1), two sets of slip assemblies (2), a leather cup assembly (3), and a push cylinder (4), wherein one end of the central tube (1) has a limiting portion (11); S200, sleeve the first set of slip components (2) on the central tube (1), and make one end of the first set of slip components (2) abut against the limiting portion (11); S300, sleeve the leather cup assembly (3) on the central tube (1), and make one end of the leather cup assembly (3) abut against the other end of the first set of slip assemblies (2); S400, sleeve the second set of slip components (2) on the central tube (1), and make one end of the second set of slip components (2) abut against the other end of the leather cup component (3); S500, sleeve the push tube (4) on the central tube (1), and make one end of the push tube (4) abut against the other end of the second group of slip components (2), thereby completing the preparation of the soluble bridge plug.

3. The method for preparing a soluble bridge plug with bidirectional slips according to claim 2, characterized in that: Step S200 includes: The clamping mechanism is used to clamp the limiting portion (11) of the central tube (1) to lift the central tube (1) and keep the central tube (1) in a horizontal state; The first slip (21), a slip washer (22), and the second slip (21) of the first slip assembly (2) are sequentially sleeved onto the central tube (1) from the other end of the central tube (1); Then, the horizontal pushing mechanism (6) is used to push the second slip (21), so that the first inclined surface (211) at one end of the second slip (21) is aligned with the second inclined surface (221) at one end of the slip pad (22), the second inclined surface (221) at the other end of the slip pad (22) is aligned with the first inclined surface (211) at one end of the first slip (21), and the first inclined surface (211) at the other end of the first slip (21) is aligned with the fifth inclined surface of the limiting portion (11), and then the horizontal pushing mechanism (6) is retracted; Step S300 includes: The first leather cup seat (31), a plurality of leather cup parts, and a second leather cup seat (31) of the leather cup assembly (3) are sequentially sleeved onto the central tube (1) from the other end of the central tube (1); Then, the horizontal pushing mechanism (6) is used to push the second leather cup seat (31), so that the components of the leather cup assembly (3) abut against each other, and the fourth inclined surface (311) of the first leather cup seat (31) of the leather cup assembly (3) is aligned with the first inclined surface (211) of the other end of the second slip (21) of the first slip assembly (2), and then the horizontal pushing mechanism (6) is retracted; Step S400 includes: The first slip (21), a slip washer (22), and the second slip (21) of the second slip assembly (2) are sequentially sleeved onto the central tube (1) from the other end of the central tube (1); Then, the horizontal pushing mechanism (6) is used to push the second slip (21) of the second slip assembly (2), so that the components of the second slip assembly (2) abut against each other, and the first inclined surface (211) of the first slip (21) of the second slip assembly (2) facing one end of the leather cup assembly (3) is abutted with the fourth inclined surface (311) of the second leather cup seat (31) of the leather cup assembly (3), and then the horizontal pushing mechanism (6) is retracted; Step S500 includes: The push cylinder (4) is sleeved on the central tube (1), and then the horizontal pushing mechanism (6) is used to push the push cylinder (4) so ​​that one end of the push cylinder (4) abuts against the outer end of the second slip (21) of the second slip assembly (2), so that the third inclined surface (41) fits with the first inclined surface (211) of the second slip (21), and then the horizontal pushing mechanism (6) is retracted.

4. The method for preparing a soluble bridge plug with bidirectional slips according to claim 3, characterized in that: The central tube (1) is clamped by a clamping mechanism on a limiting portion (11) of the central tube (1), thereby clamping the central tube (1), comprising the steps of: The limiting portion (11) of the central tube (1) is horizontally placed between a pair of arc-shaped clamping plates (53) spaced apart and arranged opposite to each other, wherein the arc-shaped clamping plates (53) are respectively slidably fitted in the vertical slide grooves (52) of the bracket (51), and each arc-shaped clamping plate (53) is respectively connected to the movable end of a vertical oil cylinder (54), and the vertical oil cylinder (54) is connected to the bracket (51); the inner end of the arc-shaped clamping plate (53) is provided with a limiting plate (531), and the limiting portion (11) is placed so as to fit the limiting plate (531); Then, the movable end of the vertical oil cylinder (54) acts on the arc-shaped clamping plate (53), so that the arc-shaped clamping plate (53) clamps the limiting portion (11) firmly and keeps it horizontal; The pushing is performed by using a horizontal pushing mechanism (6), specifically, using a pair of horizontal pushing cylinders (62) provided on a column (63) to push a pushing ring (61) connected to the movable end of the horizontal pushing cylinder (62) toward the central tube (1), so that the pushing ring (61) passes through the end of the central tube (1) and acts on the object to be pushed.

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