A hydraulic casing reshaping device

Abstract

The application provides a hydraulic casing shaping device, which comprises an axial booster and a shaper; the booster comprises a booster body and a hydraulic boosting mechanism; the shaper comprises a shaper body, a threaded rod and a mandrel; the axial upper end of the threaded rod is connected with the hydraulic boosting mechanism, and the axial bottom end forms a retreat space with the upper end surface of the mandrel; at least one ball holder is movably embedded on the shaper body; one end of each ball holder is in contact with the mandrel, and a shaping ball is arranged in each ball holder in one-to-one correspondence; the threaded rod receives the hydraulic pressure transmitted from the hydraulic boosting mechanism, moves axially downward to the upper end surface of the mandrel, pushes down the mandrel, and promotes the mandrel to push the ball holder radially outward, so that at least part of the ball body of the shaping ball is exposed from the shaper body. The shaping device provided by the application solves the problems of the existing hydraulic ball shaping technology, such as easy damage of tools, easy jamming and small range of applicable sleeve change.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal well reconstruction, in particular to a retractable hydraulic casing shaping device. BACKGROUND

[0002] At present, a plurality of oilfields in China have carried out projects of using geothermal energy to replace gas for heating of oilfield office buildings and heating of oil pipelines. Such geothermal projects have the advantages of environmental protection, saving of natural gas, sustainable energy, etc. After years of exploitation, there are many inefficient or abandoned old wells in the oilfield. The inefficient or abandoned old wells are reconstructed into geothermal wells, which can reduce the investment cost of drilling new wells, improve resource utilization rate, and reduce environmental impact. However, some inefficient or abandoned old wells have the problem of casing diameter reduction and deformation, which need to be repaired before use. However, the repair by using technologies such as overhaul and milling repair of casing has the problems of high cost, reduced casing strength after repair, etc.

[0003] The casing expansion technology is one of the main means for repairing casing deformation. At present, there are mainly two means of mechanical expansion and hydraulic expansion. The mechanical expansion mainly has the technologies of pear-shaped pipe expander expansion, eccentric roller shaping, and three-axis stick shaping. However, there are the problems of damage to casing, damage to drilling tools, difficulty in restoring the original drift diameter, long construction period, etc. The hydraulic expansion mainly uses the hydraulic ball shaping technology at present. However, there are the problems of easy breakage of balls, short service life of tools, and easy sticking of tools as a whole to cause well repair accidents, etc. SUMMARY

[0004] In view of the above problems, the present application provides a retractable hydraulic casing shaping device to solve the problems of easy damage of tools, easy sticking, and small range of applicable casing deformation of the existing hydraulic ball shaping technology.

[0005] The technical scheme of the present application is as follows:

[0006] A retractable hydraulic casing shaping device, comprising: an axial booster and a shaper, an internal aperture of the booster forms a channel for receiving pressurized liquid;

[0007] The booster comprises a booster body and a hydraulic boosting mechanism arranged on the radial inner side of the booster body. The hydraulic boosting mechanism is configured to act the hydraulic pressure of the pressurized liquid on the shaper. The shaper comprises:

[0008] a shaper body, a threaded rod and a mandrel, which are all located on the radial inner side of the shaper body. The axial upper end of the threaded rod is connected with the hydraulic boosting mechanism, and the axial bottom end forms a retreat space with the upper end surface of the mandrel. Wherein,

[0009] At least one ball holder is movably embedded on the shaper body. One end of each ball holder is in contact with the mandrel, and a shaping ball is arranged in each ball holder.

[0010] The threaded rod receives the hydraulic pressure transmitted from the hydraulic boosting mechanism, and moves axially downward to contact the upper end surface of the mandrel, pushes the mandrel downward, and promotes the mandrel to push the ball holder radially outward, so that at least part of the ball of the orthopedic ball is exposed from the orthopedic body.

[0011] As one of the preferred solutions, the booster body comprises an upper cylinder and a cylinder body, the upper part of the upper cylinder is provided with threads on the inner side for connecting to the tubing string, and the lower part of the upper cylinder is connected to the upper part of the cylinder body.

[0012] The hydraulic boosting mechanism comprises an upper piston, a lower piston and a connecting sleeve connected axially, the radial outer side of the upper piston is sealed with the upper cylinder and the cylinder body, and the radial outer side of the lower piston is sealed with the cylinder body and connected with the connecting sleeve.

[0013] As one of the preferred solutions, the booster further comprises a shear pin seat and a plurality of shear pins, the shear pin seat is located in the annular space formed by the lower part of the connecting sleeve and the lower part of the cylinder body, and is connected with the cylinder body; wherein each shear pin penetrates through the shear pin seat and is inserted into the annular groove on the connecting sleeve.

[0014] As one of the preferred solutions, at least one torsion tooth groove is provided on the connecting sleeve, and the bottom of the shear pin seat is provided with at least one torsion tooth, and each torsion tooth is inserted into each torsion tooth groove.

[0015] As one of the preferred solutions, a spring is arranged in the top end of the mandrel, and the top end of the spring abuts against the threaded rod.

[0016] As one of the preferred solutions, the upper piston, the cylinder body and the lower piston jointly form a hydraulic space, the upper piston is provided with a piston hole, the piston hole is used to communicate the channel with the hydraulic space, so as to allow the booster liquid to enter the hydraulic space.

[0017] As one of the preferred solutions, a circulation hole is provided on the connecting sleeve, and a cylinder body hole is provided on the cylinder body, the circulation hole is communicated with the channel, the cylinder body hole is communicated with the outside, and the circulation hole and the cylinder body hole are communicated to form a flow channel, so as to allow the booster liquid to flow and realize the function of flushing the sleeve.

[0018] As one of the preferred solutions, a ball seat is provided on the radial inner side of the connecting sleeve, and the radial inner side of the ball seat has a tapered surface.

[0019] As one of the preferred solutions, a plurality of first contact surfaces are provided on the mandrel in the axial direction, the wall surface of the ball holder abutting against the mandrel is a second contact surface, and the first contact surface and the second contact surface are matched.

[0020] As one of the preferred solutions, the threaded rod is detachably connected with the hydraulic boosting mechanism through left-handed trapezoidal thread.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] The present application provides a retractable hydraulic casing reshaping device, comprising: an axially arranged booster and a reshaper, the inside hole of the booster forms a channel for receiving pressurized liquid; the booster comprises a booster body and a hydraulic boosting mechanism arranged on the radial inner side of the booster body, the hydraulic boosting mechanism is configured to apply hydraulic pressure of the pressurized liquid to the reshaper; wherein the reshaper comprises a reshaping body, a threaded rod and a mandrel, all of which are located on the radial inner side of the reshaping body, the axial upper end of the threaded rod is connected with the hydraulic boosting mechanism, and the axial bottom end forms a retreat space with the upper end surface of the mandrel; wherein at least one ball holder is movably embedded on the reshaping body, one end of each ball holder is in contact with the mandrel, and a reshaping ball is arranged in each ball holder; the threaded rod receives the hydraulic pressure transmitted from the hydraulic boosting mechanism, and moves axially downward to contact the upper end surface of the mandrel, thereby pushing down the mandrel and prompting the mandrel to push the ball holder radially outward, so that at least part of the ball body of the reshaping ball is exposed from the reshaping body.

[0023] By adopting the technical solution of the present application, when the lower end of the tubing string is connected with the booster and is lowered into the casing deformation and reduced diameter well section, resin balls (or steel balls) are first put into the tool, the resin balls (or steel balls) fall into the channel and seal, and then the tubing string is pressed, the booster pushes the reshaper to expand the reduced diameter and deformed casing, so that it gradually recovers to the normal drift diameter. Since the ball holder supports the reshaping ball, stress concentration is avoided, the reshaping ball rotates flexibly and is not easy to break, and the service life of the tool is increased. When the casing deformation section cannot be expanded due to excessive resistance, the hydraulic pressure is released, the reshaping ball is squeezed inward under the extrusion of the casing, the mandrel moves upward, the ball holder contacts the smallest outer diameter section of the mandrel, the reshaping ball retreats into the body, the outer diameter of the reshaper becomes smaller, and the reshaper is easily lifted out. If the body is stuck in the casing deformation section due to excessive reshaping resistance, the tubing string can be lowered and rotated in the positive direction, so that the booster and the reshaper are separated, the booster and the tubing string can be lifted out, and the stuck construction string is avoided. The left-handed trapezoidal thread is used to connect the reshaper and the booster, which can be disassembled and replaced. For more serious casing deformation well sections, different outer diameter reshapers can be used for step-by-step reshaping from small to large. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without any creative labor based on these drawings also belong to the protection scope of the present application.

[0025] Figure 1 is a schematic diagram of the overall structure of the retractable hydraulic casing shaping device according to an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of the overall structure of the connecting sleeve according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the structure of the shear pin seat according to an embodiment of the present application;

[0028] Figure 4 is a schematic diagram of the structure of the shaping ball seat according to an embodiment of the present application;

[0029] Figure 5 is a schematic diagram of the overall structure of the ball holder according to an embodiment of the present application.

[0030] Explanation of reference signs:

[0031] 100, supercharger; 101, upper cylinder body; 1011, cylinder hole; 102, upper piston; 1021, piston hole; 103, piston sealing ring; 104, cylinder body; 1041, cylinder hole; 105, rod sealing ring; 106, lower piston; 107, connecting sleeve; 1071, circulating hole; 1072, shear groove; 1073, torsion tooth groove; 1074, left-hand internal thread; 108, ball seat; 1081, conical surface; 109, ball seat sealing ring; 110, shear pin seat; 1101, torsion tooth; 111, shear pin; 200, shaper; 201, threaded rod; 202, upper cover; 203, spring; 204, mandrel; 2041, retreat space; 2042, first contact surface; 205, body; 206, shaping ball seat; 2061, external thread; 2062, large internal hole; 2063, internal spherical hole; 2064, small internal hole; 207, shaping ball; 208, ball holder; 2081, concave spherical surface; 2082, second contact surface; 209, guide cone. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely in the following description with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and all other embodiments obtained by those skilled in the art without any creative labor based on these embodiments also belong to the protection scope of the present application.

[0033] It should be noted that the main principle of the casing deformation of the low-efficiency or abandoned old well mentioned in the background art is that after the oil, gas and water wells are put into production, the stress and fluid pressure of the development formation change greatly with the extension of the development time, which causes the external force on the casing of the oil layer to increase significantly, and at the same time, the frequent measures and workover operations also cause mechanical damage to the casing itself, thereby reducing the strength of the casing itself, and thus the casing deformation phenomenon often occurs. The casing deformation of the low-efficiency or abandoned old well reduces the internal passage diameter of the casing, and it is difficult to transform the casing into a geothermal well or the transformation cost is too high; meanwhile, some oil, gas and water wells also have the problem of being unable to produce normally due to casing deformation.

[0034] Among them, geothermal energy has the advantages of large reserves, wide distribution, stability and reliability, and can be widely used for power generation, heating, bathing, breeding and other purposes. Transforming the low-efficiency old well into a geothermal well can develop geothermal energy by using existing resources, can save drilling cost, improve resource utilization rate and reduce environmental impact. Therefore, repairing the casing deformation has become an important task in the development of oilfield geothermal energy and oil and gas development.

[0035] In the related hydraulic ball shaping technology, a researcher has proposed a hydraulic casing shaper, which is composed of a conical body, a variable-diameter steel ball, an upper joint, a steel ball in a cylindrical hole, a spring and the like. The pressure generated by the hydraulic tool is transmitted to the steel ball in the cylindrical hole through the upper joint and makes it move downward, so that the variable-diameter steel ball changes the diameter and is arranged in a certain pattern and rolls downward to extrude the inner wall of the casing to a preset size. However, in this shaping method, the variable-diameter steel ball (small steel ball) and the large steel ball are in single-point contact, which causes the extrusion pressure of the contact point to be too large in the actual construction process, the rolling friction of the variable-diameter steel ball is large, the variable-diameter steel ball is easy to break and damage, and the service life of the tool is short.

[0036] Another researcher has proposed an anchoring ball type shaping device and a casing shaping method thereof, which is composed of an upper joint, a flow leakage assembly, an anchoring assembly, a hydraulic cylinder assembly, a lower joint and a ball shaper. The tool is anchored on the casing by pressing the inside of the tool, and the hydraulic cylinder assembly pushes the ball shaper to move downward and extrude the casing, thereby expanding the reduced diameter section of the deformed casing. However, in this shaping method, the contact surface between the shaping ball and the mandrel is small, the rolling resistance of the shaping ball is large during the construction of the shaping device, the shaping ball is easy to break and cause damage to the tool, and when the shaping resistance is large and the casing cannot be expanded, the taper sleeve is easy to be stuck, which causes the whole tool to be unable to be withdrawn, resulting in a sticking accident.

[0037] Therefore, the present application aims to overcome the defects of the existing hydraulic ball shaping technology, such as easy damage to the tool, easy sticking, small applicable casing deformation range, and provides a retractable hydraulic casing shaper.

[0038] Referring to Figures 1-5 , as shown in Figure 1The schematic diagram of the overall structure of the retractable hydraulic sleeve shaping device shown in the present application; Figure 2 The overall structure diagram of the connecting sleeve shown in the present application; Figure 3 The schematic diagram of the structure of the shear pin seat shown in the present application; Figure 4 The schematic diagram of the structure of the shaping ball seat shown in the present application; Figure 5 The overall structure diagram of the ball holder shown in the present application.

[0039] As Figure 1 shown, the embodiment of the present application provides a retractable hydraulic sleeve shaping device, comprising: an axial booster 100 and a shaper 200, the inside hole of the booster 100 forms a channel for receiving pressurized liquid; the booster 100 comprises a booster body and a hydraulic boost mechanism arranged on the radial inner side of the booster body, the hydraulic boost mechanism is configured to act the hydraulic pressure of the pressurized liquid on the shaper 200; wherein the shaper 200 comprises: a shaper body and a threaded rod 201 and a mandrel 204 which are located on the radial inner side of the shaper body, the axial upper end of the threaded rod 201 is connected with the hydraulic boost mechanism, and the axial bottom end forms a retreat space 2041 with the upper end surface of the mandrel 204; wherein at least one ball holder 208 is movably embedded on the shaper body, one end of each ball holder 208 is in contact with the mandrel 204, and each ball holder 208 is correspondingly provided with a shaping ball 207; the threaded rod 201 receives the hydraulic pressure transmitted from the hydraulic boost mechanism, and axially descends to the upper end surface of the mandrel 204 to contact, push down the mandrel 204, and promote the mandrel 204 to push the ball holder 208 radially outward, so that at least part of the ball body of the shaping ball 207 is exposed from the shaper body.

[0040] Specifically, as Figure 1 shown, the present application consists of two parts of the booster 100 and the shaper 200, the booster 100 consists of the upper cylinder body 101, the upper piston 102, the piston sealing ring 103, the cylinder body 104, the rod sealing ring 105, the lower piston 106, the connecting sleeve 107, the ball seat 108, the ball seat sealing ring 109, the shear pin seat 110, and the shear pin 111. The shaper 200 consists of the threaded rod 201, the upper cover 202, the spring 203, the mandrel 204, the body 205, the shaping ball seat 206, the shaping ball 207, the ball holder 208, and the guide cone 209.

[0041] Among them, the upper cover 202, the body 205 and the guide cone 209 constitute the shaper body of the shaper 200, and the upper cylinder body 101 and the cylinder body 104 constitute the booster body of the booster.

[0042] It should be noted that the present application uses more axial upper end and axial lower end and other terms, which can be understood as in the axial direction, the part closer to the axial top end is classified as the axial upper end, and the part closer to the axial bottom end is classified as the axial lower end. The axial direction specifically refers to the direction from the upper cylinder body 100 to the guide cone 209. For example, when the device is placed as shown in Figure 1 the axial direction can be understood as the height direction, and the upper cylinder body 100 is located above the guide cone 209; in some embodiments, when the device is placed horizontally, the axial direction is the length direction, that is, the upper cylinder body 100 is located on the left side of the guide cone 209. For ease of description, the axial direction is the height direction in the following description, and at this time the axial top end can be regarded as the top / end / surface, and the axial bottom end can be regarded as the bottom / end / surface.

[0043] It should also be noted that the radial inner side mentioned below can be understood as the side close to the center axis, and the radial outer side is the side away from the center axis.

[0044] The internal bore of the supercharger 100 forms a channel, which can be that the corresponding components constituting the supercharger 100 and located on the radial inner side are all penetrated by the inner hole, and the inner holes of the corresponding components are communicated to form an inner channel diameter, and the supercharging liquid can enter the channel to realize functions such as supercharging, forward washing and reverse washing at different operation periods.

[0045] Specifically, the upper part of the upper cylinder body 101 is an oil pipe internal thread, which can be connected to the oil pipe string, the lower part is connected to the cylinder body 104 through a thread, the cylinder body 104 is connected to the shear pin seat 110 through a thread, the inner hole of the upper cylinder body 101 is placed with the upper piston 102, the lower end of the upper piston 102 is connected to the lower piston 106 through a thread, the lower piston 106 is connected to the upper part of the connecting sleeve 107 through a thread, the outer circle between the large end of the upper piston 102 and the inner hole of the upper cylinder body 101 and the outer circle between the large end of the lower piston 106 and the inner hole of the cylinder body 104 are all sealed by the piston sealing ring 103, and the outer circle between the small end of the upper piston 102 and the inner hole of the cylinder body 104 and the outer circle between the small end of the lower piston 106 and the inner hole of the upper end of the connecting sleeve 107 are all sealed by the rod sealing ring 105. The upper part of the threaded rod 201 is connected to the lower part of the inner hole of the connecting sleeve 107 of the supercharger 100 through a thread, the lower end hooks the inner hole of the upper cover 202, the lower end of the upper cover 202 is connected to the inner hole of the body 205 through a thread, and the lower end of the body 205 is connected to the guide cone 209 through a thread. The inner hole of the body 205 is provided with a mandrel 204.

[0046] In some embodiments, the top end of the mandrel 204 is provided with a spring 203, and the top end of the spring 203 abuts against the threaded rod 201.

[0047] The spring 203 is arranged in the upward blind hole in the center of the top of the mandrel 204, and the bottom of the threaded rod 201 has a downward blind hole, and the upper part of the mandrel 204 with the spring 203 is arranged in the blind hole, so that the top end of the spring 203 abuts against the bottom (the top of the blind hole) of the threaded rod 201. Meanwhile, the lower end surface of the threaded rod 201 and the upper end surface of the largest outer circle of the mandrel 204 have a distance, which is the height of the retreat space 2041. Therefore, when the lower end of the tubing string connected with the booster 100 is lowered into the casing deformation and reduced diameter well section, the threaded rod 201 compresses the spring 203 and moves downward by a distance of the retreat space 2041, and pushes down the mandrel 204. When the casing deformation section cannot be expanded due to excessive resistance, the hydraulic pressure can be released, the shaping ball 207 is extruded inward under the extrusion of the casing, the ball holder 208 and the mandrel 204 are extruded inward, the mandrel 204 is raised by compressing the spring 203, the ball holder 208 contacts the mandrel 204 at the smallest outer circle, and the shaping ball 207 retreats into the body 205, which is convenient for lifting.

[0048] In the embodiment, the upper piston 102, the cylinder body 104 and the lower piston 106 jointly form a hydraulic space, the upper piston 102 is provided with a piston hole 1021 for connecting the channel with the hydraulic space to allow the booster liquid to enter the hydraulic space. The cross section of the upper piston 102 and the lower piston 106 is generally a T-shaped hole, and the cross section of the cylinder body 104 is a two-pronged harrow. The upper part of the cylinder body 104 is sleeved on the small end outer circle of the upper piston 102, and the large end inner threaded hole of the lower piston 106 is sleeved on the small end outer thread of the upper piston 102, so that the top surface of the large end outer circle of the lower piston 106 and the bottom surface of the upper part of the cylinder body 104 have a longitudinal distance.

[0049] The lower piston 106 is arranged in the lower part inner hole of the cylinder body 104, the large end outer circle of the lower piston 106 contacts the lower part inner hole of the cylinder body 104, so that the small end outer circle of the upper piston 102 and the lower part inner hole of the cylinder body 104 form an annular space. The connecting sleeve 107 is connected with the lower part small outer circle end of the lower piston 106 by threads. In this way, the upper piston 102, the cylinder body 104 and the lower piston 106 jointly form an annular hydraulic space, and a piston hole 1021 is arranged in the lower part small outer circle of the upper piston 102 to connect the channel with the hydraulic space, so that the booster liquid in the channel can enter the hydraulic space through the piston hole 1021, and continuously accumulate to increase the pressure, thereby driving the upper piston 102, the lower piston 106 and the connecting sleeve 107 to move downward and drive the body of the shaper 200 to move downward.

[0050] In some embodiments, a pressure relief space is formed between the upper piston 102, the cylinder 104, and the upper cylinder 101, and the upper cylinder 101 is provided with a cylinder hole 1011 for connecting the pressure relief space with the outside. When the upper piston 102 moves downward under the action of hydraulic pressure, the liquid in the pressure relief space is squeezed and discharged, eliminating the hydraulic resistance of the liquid in the pressure relief space to the downward movement of the piston 102. In this embodiment, the upper part of the upper piston 102 is sealed in the lower part of the inner hole of the upper cylinder 101, and the lower part of the upper piston 102 is sealed in the upper part of the small inner hole of the cylinder 104, so that the upper top surface of the cylinder 104 and the upper bottom surface of the upper piston 102 have a longitudinal distance; the upper outer side of the cylinder 104 is connected with the upper cylinder 101, so that the lower small outer circle of the upper piston 102 and the lower inner hole of the upper cylinder 101 form an annular space. In this way, an annular pressure relief space is formed between the three, and a cylinder hole 1011 is provided on the outer side of the upper cylinder 101 to communicate with the lower side of the annular pressure relief space. When the upper piston 102 moves downward under the action of hydraulic pressure, the height of the annular pressure relief space gradually decreases, the liquid in the annular space is squeezed and discharged from the cylinder hole 1011, avoiding the problem of difficult downward movement of the upper piston 102 due to the incompressibility of the liquid.

[0051] In another embodiment, the connecting sleeve 107 is provided with a circulating hole 1071, and the cylinder 104 is provided with a cylinder hole 1041, the circulating hole 1071 communicates with the channel, the cylinder hole 1041 communicates with the outside, and the circulating hole 1071 and the cylinder hole 1041 form a flow passage to allow the flow of the pressurized liquid and realize the function of washing the casing. In this embodiment, when casing shaping is performed, the present application is connected to the lower end of the tubing string and is lowered to the position above the casing deformation and diameter reduction position. The position needing shaping of the casing can be washed through the cylinder hole 1041 and the circulating hole 1071, and then a resin ball (or a steel ball) is put into the inner hole of the tubing string to the position of the tapered surface 1081 of the ball seat 108 to realize sealing, and then the pressurizing and expanding operation is performed.

[0052] In further embodiments, as shown in Figure 1 The ball seat 108 is provided in the connecting sleeve 107 and has a tapered surface 1081 inside. The ball seat 108 is a ring-shaped part, and the inner hole thereof is divided into three parts, the upper part is a large inner hole with a larger diameter, the lower part is a small inner hole with a smaller diameter, and the smooth tapered surface 1081 between the large inner hole and the small inner hole is used to realize linear sealing with the resin ball (or the steel ball) put in.

[0053] In combination with the above embodiments, the hydraulic space is located above the ball seat 108, and the flow passage is located below the ball seat 108, so as to select the functions of positive washing, reverse washing, and pressurizing and expanding according to the construction requirements.

[0054] As shown in Figure 2As shown, the supercharger further comprises a shear pin seat 110 and a plurality of shear pins 111, the shear pin seat 110 is located in the annular space formed by the lower part of the connecting sleeve 107 and the lower part of the cylinder body 104, and is threadedly connected with the cylinder body 104; each of the shear pins 111 penetrates the shear pin seat 110 and is threadedly connected with the shear pin seat, and the small end of the shear pin is inserted into a circle of annular grooves (rectangular in longitudinal section) 1072 on the small outer circle of the connecting sleeve 107. Specifically, the inner hole of the connecting sleeve 107 has a circulation hole 1071 in the middle part in radial direction, which is communicated with the channel, and has left-handed internal threads 1074 in the lower part, and the outer part is composed of a small outer circle in the upper part and a large outer circle in the lower part, and the small outer circle has a circle of annular grooves (rectangular in longitudinal section) 1072 in the lower part, and the large outer circle has a plurality of rectangular (or key groove shaped) torsion tooth grooves 1073 in the upper part, and the number of the torsion tooth grooves is preferably 4 (or 2-6).

[0055] As shown in the figure, Figure 3 The shear pin seat 110 is a tubular part, the inner part is a through hole, and the outer part is composed of three sections, the upper part is a normal external thread, the middle part is an outer circle with a larger diameter than the upper part, and the lower part is four (or two to six) rectangular or inverted trapezoidal torsion teeth 1101, which can be inserted into the torsion tooth grooves 1073 in the upper part of the large outer circle of the lower end of the connecting sleeve 107. The middle part has four (or six) threaded holes communicated with the inner through hole, and each threaded hole is fitted with a shear pin, and the small end of the shear pin 111 is inserted into the annular groove 1072 on the outer circle of the connecting sleeve 107.

[0056] In some other embodiments, the mandrel 204 is provided with a plurality of first contact surfaces 2042 in the axial direction, the wall surface of the ball holder 208 abutting against the mandrel 204 is a second contact surface 2082, and the first contact surface 2042 and the second contact surface 2082 cooperate. As shown in the figure, Figure 1 The outer circle of the body 205 has a plurality of rows of threaded holes from top to bottom, six (or four to eight) holes in each row, which are uniformly distributed in the circumference, and each threaded hole is fitted with a shaping ball seat 206, a shaping ball 207 and a ball holder 208.

[0057] As shown in the figure, Figure 4 The shaping ball seat 206 is an annular part, the outer circle of which is an external thread 2061; the inner hole is composed of three parts, the inward part is a large inner hole 2062 with a larger diameter, the middle part is an inner spherical hole 2063 (circular arc surface), and the outward part is a small inner hole 2064 with a smaller diameter.

[0058] As shown in the figure, Figure 5As shown, the side of the ball holder 208 in contact with the shaping ball 207 is a concave spherical surface 2081, and the wall surface in contact with the mandrel 204 is a second contact surface 2082. The second contact surface 2082 can be a convex spherical surface (or an outer conical surface). The outer circle of the mandrel 204 has a plurality of first contact surfaces 2042 arranged in sequence along the axial direction, and the first contact surfaces 2042 can be an outer conical surface or a convex spherical surface or a circular arc surface. Each first contact surface 2042 corresponds to a row of convex spherical surfaces (or outer conical surfaces) of the ball holder 208. By arranging the ball holder 208, the stress condition of the shaping ball 207 is improved, and damage of the shaping ball 207 due to stress concentration is avoided.

[0059] By arranging the outer conical surface on the mandrel 204, when the outer conical surface advances or retreats under the action of the booster 100, the ball holder 208 and the shaping ball 207 can be extended out of the body 205 or withdrawn into the body 205. When the shaping ball 207 extends out of the body 205, the outer diameter of the shaper increases, and the inner diameter of the deformed sleeve is squeezed to increase the inner diameter to achieve sleeve shaping. When the shaping ball 207 is withdrawn into the body 205, the outer diameter of the shaper 200 decreases, and the working string (usually an oil pipe string) is lifted to make the tool exit the sleeve deformation well section, so that the tool can be withdrawn.

[0060] Referring again to Figure 1 As shown, the upper end of the threaded rod 201 is left-handed external thread, the shaper 200 and the booster 100 are independent assemblies, and the left-handed trapezoidal thread is used to connect between the two, so that the shaper 200 of different outer diameters can be disassembled and replaced before being lowered into the well. In this way, by designing the left-handed connecting thread between the booster 100 and the shaper 200, the booster 100 and the shaper 200 are disengaged and exit the working string by forward rotation, so as to avoid being stuck in the working string. The shaper 100 and the booster 200 are connected by the left-handed trapezoidal thread, and can be disassembled and assembled as a whole. For more serious sleeve deformation well sections, by replacing the shapers of different sizes, the shaping can be gradually performed from small to large.

[0061] The application process of the present application is as follows:

[0062] When casing is reshaped, the application is connected to the lower end of the tubing string, and is lowered to the position above the casing deformation and contraction position. The position needing to be reshaped is circulated and flushed through the cylinder hole 1041 and the circulation hole 1071. The resin ball (or steel ball) is put into the hole of the tubing string to the position of the tapered surface 1081 of the ball seat 108 to realize sealing, and then the inside of the tubing string is pressed. The upper piston 102, the lower piston 106 and the connecting sleeve 107 of the booster 100 are pushed downward by the hydraulic pressure to move the body of the reshaper 200 downward. At the same time, the threaded rod 201 compresses the spring 203 and moves downward by a distance of the retreat space 2041, the lower push rod 204 pushes the outer conical surface outward to push the ball holder 208 to make part of the ball body of the reshaping ball 207 protrude out of the body 205, and the outer diameter of the reshaper 200 becomes larger. The reshaper 200 moves downward, the reshaping ball 207 is extruded outward and rolls downward, and the deformed casing is gradually expanded to restore to the normal drift diameter.

[0063] When the expansion construction is completed or cannot be completed due to too large resistance, the pressure inside the tubing string is released, and the reshaping ball 207 is pushed by the touch and extrusion of the casing inner wall to push the ball holder 208 to extrude the outer conical surface of the core shaft 204 to make the core shaft 204 compress the spring 203 and move upward. The ball holder 208 is in contact with the minimum outer circle of the core shaft 204, the reshaping ball 207 is correspondingly retracted into the body 205, and the outer diameter of the reshaper 200 becomes smaller to facilitate the lifting.

[0064] When the body 205 is stuck in the deformed and contracted casing due to too large expansion resistance, the tubing string can be lowered and slowly rotated in the positive direction, the torsion teeth 1101 at the lower end of the shear pin seat 110 are inserted into the torsion groove 1073 on the large outer circle at the lower end of the connecting sleeve 107, the tubing string is continuously rotated in the positive direction, the left-handed thread 1074 at the lower part of the inner hole of the connecting sleeve 107 is separated from the left-handed thread at the upper part of the threaded rod 201, the booster 100 is lifted together with the tubing string from the well to avoid the stuck construction string.

[0065] Therefore, the application provides a retractable hydraulic casing reshaping device which can expand the deformed and contracted casing through the pressing mode, has the advantages of long tool life, the ball is not easy to break, the construction string can be withdrawn when the tool is stuck to avoid sticking, and different sizes of the reshaper can be replaced on the ground, so that the application has the ability to repair the more serious casing deformation.

[0066] It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other.

[0067] It should be noted that, in this article, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, nor can it be understood as indicating or implying relative importance. Moreover, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or terminal device.

[0068] The above provides a retractable hydraulic casing shaping device, and the principles and implementation modes of the present application are described by applying specific examples. The above example is only used to help understand the present application, and the content of the description should not be understood as a limitation on the present application. Meanwhile, for those skilled in the art, according to the present application, there will be different forms of changes in specific implementation modes and application ranges, which do not need and cannot be exhausted here, and the obvious changes or changes derived therefrom are still within the protection scope of the present application.

Claims

1. A retractable hydraulic sleeve shaping device, characterized in that, include: An axially arranged intensifier and shaper, wherein the internal opening of the intensifier forms a channel for receiving intensifying fluid; The booster includes a booster body and a hydraulic booster mechanism disposed radially inside the booster body. The hydraulic booster mechanism is configured to apply the hydraulic pressure of the booster fluid to the shaper. The shaper includes: The shaping body includes a threaded rod and a mandrel, both located radially inside the shaping body. The upper axial end of the threaded rod is connected to the hydraulic booster mechanism, and the lower axial end forms a clearance space with the upper end face of the mandrel. At least one ball holder is movably embedded on the shaping body, one end of each ball holder abuts against the mandrel, and a shaping ball is correspondingly arranged in each ball holder; The threaded rod receives the hydraulic pressure transmitted from the hydraulic booster mechanism, descends axially to contact the upper end face of the mandrel, pushes the mandrel downward, and causes the mandrel to push the ball support radially outward, thereby exposing at least a portion of the shaped ball to the shaped body; The booster body includes an upper cylinder body and a cylinder body. The upper inner side of the upper cylinder body is provided with threads for connecting to the oil pipe string. The lower part of the upper cylinder body is connected to the upper part of the cylinder body. The hydraulic booster mechanism includes an upper piston, a lower piston, and a connecting sleeve that are axially connected. The radial outer sides of the upper piston are sealed to the upper cylinder and the cylinder body. The radial outer sides of the lower piston are sealed to the cylinder body and are sealed to the connecting sleeve. A spring is installed inside the top of the mandrel, and the top of the spring abuts against the threaded rod. When the pressure is released from the tubing string and the pressure is stopped, the shaping ball can push the ball holder to squeeze the outer conical surface of the mandrel under the contact and compression of the inner wall of the casing, causing the mandrel to compress the spring upward. The ball holder contacts the smallest outer circle of the mandrel, and the shaping ball retracts into the body accordingly.

2. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, The turbocharger also includes a shear pin seat and a plurality of shear pins. The shear pin seat is located in the annular space formed by the lower part of the connecting sleeve and the lower part of the cylinder body, and is connected to the cylinder body. Each shear pin passes through the shear pin seat and is inserted into an annular groove on the connecting sleeve.

3. The retractable hydraulic sleeve shaping device according to claim 2, characterized in that, The connecting sleeve is provided with at least one torsion tooth groove, and the bottom of the shear pin seat is provided with at least one torsion tooth, with each torsion tooth inserted into each torsion tooth groove.

4. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, The upper piston, the cylinder, and the lower piston together form a hydraulic space. The upper piston has a piston hole, which is used to connect the channel with the hydraulic space to allow the booster fluid to enter the hydraulic space.

5. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, The connecting sleeve has a circulation hole, and the cylinder body has a cylinder body hole. The circulation hole is connected to the channel, and the cylinder body hole is connected to the outside. The circulation hole and the cylinder body hole are connected to form a flow channel to allow the pressurizing fluid to flow and realize the function of flushing the sleeve.

6. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, A ball seat is provided on the radially inner side of the connecting sleeve, and the radially inner side of the ball seat has a conical surface.

7. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, The mandrel has multiple first contact surfaces along the axial direction, and the wall surface of the ball support that abuts against the mandrel is the second contact surface. The first contact surfaces and the second contact surfaces cooperate with each other.

8. The retractable hydraulic sleeve shaping device according to claim 1, characterized in that, The threaded rod is detachably connected to the hydraulic booster mechanism via a left-handed trapezoidal thread.

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