Retractable hydraulic sleeve shaping device

Abstract

The invention provides a returnable hydraulic sleeve shaping device. The returnable hydraulic sleeve shaping device comprises a supercharger and a shaper which are axially arranged, the supercharger comprises a supercharging body and a hydraulic boosting mechanism; the shaper comprises a shaping 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 of the threaded rod and the upper end face of the mandrel form a receding space. At least one ball support is movably embedded in the shaping body, one end of each ball support abuts against the mandrel, and shaping balls are arranged in the ball supports in a one-to-one correspondence mode. The threaded rod receives hydraulic force transmitted from the hydraulic boosting mechanism, axially moves downwards to the upper end face of the mandrel to make contact with the mandrel, the mandrel is pushed downwards, the mandrel is promoted to push the ball support outwards in the radial direction, and therefore at least part of the ball body of the shaping ball is exposed out of the shaping body. By means of the shaping device, the problems that in an existing hydraulic ball shaping technology, tools are prone to being damaged and stuck, and the applicable casing deformation range is small are solved.

Description

Technical Field

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

[0002] At present, many oil fields in China have launched projects to use geothermal energy instead of gas for heating of oil field offices and heating of oil pipelines. Such geothermal projects have the advantages of environmental protection, natural gas saving, and energy sustainability. After years of exploitation, there are many inefficient or obsolete old wells in the oil fields. Transforming inefficient or obsolete old wells into geothermal wells can reduce the investment cost of drilling new wells, improve resource utilization, and reduce environmental impact. However, some inefficient or obsolete old wells have the problem of casing shrinkage and deformation, which need to be repaired before use. However, the use of overhaul grinding and milling to repair casing has problems such as high cost and reduced casing strength after repair.

[0003] The expansion sleeve technology is one of the main means to repair casing deformation. Currently, there are two main methods: mechanical expansion sleeve and hydraulic expansion sleeve. Mechanical expansion sleeves mainly include pear-shaped expander expansion sleeve technology, eccentric roller shaping technology, and three-axis stick shaping technology. There are common problems such as damage to casing, damage to drilling tools, difficulty in restoring the original diameter, and long construction period. Hydraulic expansion sleeves are currently mainly based on hydraulic ball shaping technology, but there are problems such as the ball is fragile, the tool has a short service life, and the tool as a whole is easily stuck, causing well repair accidents. Summary of the invention

[0004] In view of the above problems, the present invention provides a retractable hydraulic casing shaping device to solve the problems of the existing hydraulic ball shaping technology, such as the tool is easy to be damaged, easy to get stuck, and the applicable casing change range is small.

[0005] The technical solution of the present invention is:

[0006] A retractable hydraulic casing shaping device comprises: a booster and a shaping device arranged axially, wherein an internal opening of the booster forms a channel for receiving a boosting fluid;

[0007] The supercharger comprises a supercharger body and a hydraulic booster mechanism disposed radially inwardly of the supercharger body, wherein the hydraulic booster mechanism is configured to apply the hydraulic pressure of the supercharged fluid to the shaper; wherein the shaper comprises:

[0008] A shaping body and a threaded rod and a core shaft both located radially inside the shaping body, wherein the axial upper end of the threaded rod is connected to the hydraulic boosting mechanism, and the axial lower end forms a retreat space with the upper end surface of the core shaft; wherein,

[0009] At least one ball holder is movably embedded on the shaping body, one end of each ball holder contacts the core shaft, and a shaping ball is correspondingly arranged in each ball holder;

[0010] The threaded rod receives the hydraulic pressure transmitted from the hydraulic booster mechanism, moves axially downward to contact the upper end surface of the core shaft, pushes down the core shaft, and causes the core shaft to push the ball holder radially outward, so that at least part of the spherical body of the shaping ball is exposed from the shaping body.

[0011] As one of the preferred solutions, the booster body includes an upper cylinder body and a cylinder body, the inner side of the upper part of the upper cylinder body is provided with a thread 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;

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

[0013] As one of the preferred schemes, the supercharger also includes a shear nail seat and a plurality of shear nails, wherein the shear nail seat is located in the annulus formed by the lower part of the connecting sleeve and the lower part of the cylinder body, and is connected to the cylinder body; wherein each of the shear nails passes through the shear nail 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 at least one torsion tooth is provided on the bottom of the shear nail seat, and each torsion tooth is inserted into each torsion tooth groove.

[0015] As one of the preferred solutions, a spring is installed in the top end of the core shaft, 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, and the upper piston is provided with a piston hole, and the piston hole is used to connect the channel with the hydraulic space to allow the pressurized fluid to enter the hydraulic space.

[0017] As one of the preferred schemes, a circulation hole is opened on the connecting sleeve, and a cylinder hole is opened on the cylinder body. The circulation hole is connected with the channel, and the cylinder hole is connected with the outside world. The circulation hole and the cylinder hole are connected to form a flow channel to allow the pressurized 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 conical surface.

[0019] As one of the preferred solutions, the core shaft is provided with a plurality of first contact surfaces along the axial direction, the wall surface of the ball holder in contact with the core shaft is the second contact surface, and the first contact surface and the second contact surface match each other.

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

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

[0022] The present invention proposes a retractable hydraulic casing shaping device, comprising: an axially arranged booster and a shaper, wherein the internal opening of the booster forms a channel for receiving a boosting fluid; the booster comprises a boosting body and a hydraulic boosting mechanism arranged on the radial inner side of the boosting body, wherein the hydraulic boosting mechanism is configured to apply the hydraulic pressure of the boosting fluid to the shaper; wherein the shaper comprises: a shaping body and a threaded rod and a mandrel both located on the radial inner side of the shaping body, wherein the axial upper end of the threaded rod is in contact with the hydraulic The hydraulic boosting mechanism is connected, and the axial bottom end forms a retreat space with the upper end surface of the core shaft; wherein, at least one ball holder is movably embedded on the shaping body, one end of each ball holder is in contact with the core shaft, and a shaping ball is arranged in each ball holder in a one-to-one correspondence; 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 core shaft, pushes down the core shaft, and causes the core shaft to push the ball holder radially outward, so that at least part of the spherical body of the shaping ball is exposed from the shaping body.

[0023] By adopting the technical solution of the present application, when the lower end of the tubing string is connected to the booster and lowered into the casing deformation and reduced diameter well section, a resin ball (or steel ball) is first put into the tool, and the resin ball (or steel ball) falls into the channel seal and then presses into the tubing string, and the booster pushes the shaper to expand the reduced diameter deformed casing, so that it gradually returns to the normal diameter. Since the shaping ball is supported by the ball holder, the stress concentration of the shaping ball is avoided, so that it can rotate flexibly and is not easy to break, thereby increasing the tool life. When the casing deformation section cannot be expanded due to excessive resistance, the hydraulic pressure is released, and the shaping ball squeezes the ball holder and the mandrel inward under the pressure of the casing, the mandrel moves upward, the ball holder contacts the minimum outer diameter section of the mandrel, the shaping ball retreats into the body, the outer diameter of the shaper becomes smaller, and it is easy to pull out. If the body is stuck in the casing deformation section due to excessive shaping resistance, the tubing string can be lowered and rotated forward to disengage the booster from the shaper, and the booster and the tubing string can be pulled out to avoid getting stuck in the construction string. The shaper and the booster are connected by left-handed trapezoidal threads and can be disassembled and replaced. For the more serious casing deformation section, the shapers with different outer diameters can be replaced step by step from small to large. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

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

[0027] Figure 3 It is a structural schematic diagram of a nail shearing seat according to an embodiment of the present application;

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

[0029] Figure 5 It is an overall structural diagram of the ball holder described in one embodiment of the present application.

[0030] Description of reference numerals:

[0031] 100, supercharger; 101, upper cylinder; 1011, cylinder hole; 102, upper piston; 1021, piston hole; 103, piston seal; 104, cylinder; 1041, cylinder hole; 105, rod seal; 106, lower piston; 107, connecting sleeve; 1071, circulation hole; 1072, shear groove; 1073, torsion tooth groove; 1074, left-hand internal thread; 108, ball seat; 1081, cone surface; 109, ball seat seal; 110, shear nail seat; 11 01, torsion tooth; 111, shear nail; 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 inner hole; 2063, inner spherical hole; 2064, small inner hole; 207, shaping ball; 208, ball holder; 2081, concave spherical surface; 2082, second contact surface; 209, guide cone. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be noted that the main principle of the shrinkage and deformation of casing in inefficient or abandoned old wells mentioned in the background technology is that after the oil, gas and water wells are put into production, as the development time prolongs, the stress and fluid pressure of the development strata have changed greatly, resulting in a significant increase in the external force on the oil layer casing. At the same time, frequent measures and well repair operations also cause mechanical damage to the casing itself, reducing the strength of the casing itself, so casing deformation often occurs. The casing deformation of inefficient or abandoned old wells reduces the diameter inside the casing, making it difficult to transform into a geothermal well or the cost of transformation is too high; at the same time, some oil, gas and water wells also have the problem of being unable to produce normally due to casing changes.

[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 inefficient old wells into geothermal wells can utilize existing resources to develop geothermal energy, save drilling costs, improve resource utilization, and reduce environmental impact. Therefore, repairing casing deformation has become an important task in geothermal energy development and oil and gas development in oil fields.

[0035] In the related hydraulic ball shaping technology, some researchers have proposed a hydraulic casing shaper, which consists of a conical body, a variable diameter steel ball, an upper joint, a steel ball in a cylindrical hole, a spring, etc. The pressure generated by the hydraulic tool is transmitted to the steel ball in the cylindrical hole through the upper joint and moves it downward, so that the variable diameter steel ball changes its diameter and arranges it in a certain pattern and rolls downward, squeezing the inner wall of the casing to a preset size. However, the variable diameter steel ball (small steel ball) and the large steel ball of this shaping method are in single-point contact, which results in excessive extrusion pressure at the contact point during actual construction, large rolling friction of the variable diameter steel ball, easy rupture and damage, and short tool life.

[0036] Another researcher proposed an anchored ball-shaped shaping device and a casing shaping method thereof, which consists of an upper joint, a discharge assembly, an anchor assembly, a hydraulic cylinder assembly, a lower joint, a ball-shaped shaping device, etc. The tool is first anchored on the casing by pressing the inside of the tool, and then the hydraulic cylinder assembly pushes the ball-shaped shaping device downward and squeezes the casing to expand the reduced diameter section of the deformed casing. However, in this shaping method, due to the small contact surface between the shaping ball and the core shaft, the rolling resistance of the shaping ball is large during the construction of the shaping device, and the shaping ball is easily broken, resulting in damage to the tool; and when the shaping resistance is large and the casing cannot be expanded, the cone sleeve is easily stuck, resulting in the inability to withdraw the entire set of tools, causing a drill jam accident.

[0037] In view of this, the present invention aims to overcome the defects of the existing hydraulic ball shaping technology, such as easy damage and jamming of the tool and a small range of applicable sleeve changes, and provide a retractable hydraulic casing shaper.

[0038] Reference Figure 1-Figure 5 As shown, Figure 1It is a schematic diagram of the overall structure of the retractable hydraulic casing shaping device shown in the present invention; Figure 2 It is the overall structural diagram of the connecting sleeve shown in the present invention; Figure 3 It is a structural schematic diagram of the nail shearing seat shown in the present invention; Figure 4 It is a structural schematic diagram of a shaping ball seat shown in the present invention; Figure 5 It is the overall structural diagram of the ball holder shown in the present invention.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a retractable hydraulic casing shaping device, comprising: an axially arranged booster 100 and a shaper 200, wherein the internal opening of the booster 100 forms a channel for receiving a boosting fluid; the booster 100 comprises a boosting body and a hydraulic boosting mechanism arranged on the radial inner side of the boosting body, wherein the hydraulic boosting mechanism is configured to apply the hydraulic pressure of the boosting fluid to the shaper 200; wherein the shaper 200 comprises: a shaping body and a threaded rod 201 and a core shaft 204 both located on the radial inner side of the shaping body, wherein the axial upper end of the threaded rod 201 is connected to the hydraulic boosting mechanism The shaping body is connected with the hydraulic booster mechanism, and the axial bottom end forms a retreat space 2041 with the upper end surface of the core shaft 204; wherein, at least one ball holder 208 is movably embedded on the shaping body, one end of each ball holder 208 is in contact with the core shaft 204, and a shaping ball 207 is arranged in each ball holder 208 in a one-to-one correspondence; the threaded rod 201 receives the hydraulic pressure transmitted from the hydraulic booster mechanism, and moves axially downward to contact the upper end surface of the core shaft 204, pushing down the core shaft 204, causing the core shaft 204 to push the ball holder 208 radially outward, so that at least part of the spherical body of the shaping ball 207 is exposed from the shaping body.

[0040] Specifically, if Figure 1 As shown, the present invention is composed of two major parts: a supercharger 100 and a shaper 200. The supercharger 100 is composed of an upper cylinder 101, an upper piston 102, a piston seal 103, a cylinder 104, a rod seal 105, a lower piston 106, a connecting sleeve 107, a ball seat 108, a ball seat seal 109, a shear pin seat 110, and a shear pin 111. The shaper 200 is composed of a threaded rod 201, an upper cover 202, a spring 203, a core shaft 204, a body 205, a shaping ball seat 206, a shaping ball 207, a ball holder 208, and a guide cone 209.

[0041] The upper cover 202, the body 205 and the guide cone 209 constitute the shaping body of the shaper 200, and the upper cylinder body 101 and the cylinder body 104 constitute the supercharger body of the supercharger.

[0042] It should be noted that the present invention uses the terms such as axial upper end and axial lower end more frequently, which can be understood as that 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 as shown in FIG. Figure 1 When placed as shown, 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 the convenience of description, the axial direction is described as the height direction below, and the axial top end can be regarded as the top / end / face, and the axial bottom end can be regarded as the bottom / end / face.

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

[0044] The internal openings of the supercharger 100 form a channel. The corresponding components that constitute the supercharger 100 and are located on the radial inner side all have inner holes, and the inner holes of the corresponding components are connected to form an inner diameter. The pressurized fluid can enter the channel to achieve functions such as pressurization, forward washing and backwashing in different operating periods.

[0045] Specifically, the upper part of the upper cylinder body 101 is an internal thread of the oil pipe, which can be connected to the oil pipe string, and the lower part is connected to the cylinder body 104 through a thread, and the cylinder body 104 is connected to the shear nail seat 110 through a thread. An upper piston 102 is placed in the inner hole of the upper cylinder body 101, and the lower end of the upper piston 102 is connected to the lower piston 106 through a thread, and the lower piston 106 is connected to the upper part of the connecting sleeve 107 through a thread. The piston sealing ring 103 is used to seal between the large end outer circle of the upper piston 102 and the inner hole of the upper cylinder body 101, and between the large end outer circle of the lower piston 106 and the inner hole of the cylinder body 104. The rod sealing ring 105 is used to seal between the small end outer circle of the upper piston 102 and the inner hole of the cylinder body 104, and between the small end outer circle of the lower piston 106 and the upper end inner hole of the connecting sleeve 107. The upper part of the threaded rod 201 is threadedly connected to the lower part of the inner hole of the connecting sleeve 107 of the supercharger 100, and the lower end of the threaded rod 201 is hooked on the inner hole of the upper cover 202. The lower end of the upper cover 202 is threadedly connected to the inner hole of the body 205, and the lower end of the body 205 is threadedly connected to the guide cone 209. The inner hole of the body 205 is provided with a core shaft 204.

[0046] In some embodiments, a spring 203 is installed at the top end of the core shaft 204 , and the top end of the spring 203 abuts against the threaded rod 201 .

[0047] Among them, a blind hole with an opening upward can be opened in the center area of ​​the top of the mandrel 204 to install the spring 203, and the bottom of the threaded rod 201 also has a blind hole with an opening facing downward, and the upper part of the mandrel 204 installed with the spring 203 is located in the blind hole, so that the top of the spring 203 abuts against the bottom of the threaded rod 201 (the top of the blind hole). At the same time, there is a distance between the lower end surface of the threaded rod 201 and the upper end surface of the maximum outer circle of the mandrel 204, and the distance is the height of the retreat space 2041. Therefore, when the lower end of the oil pipe string is connected to the booster 100 and 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, pushing the mandrel 204 downward. When the deformation section of the sleeve cannot be expanded due to excessive resistance, the hydraulic pressure can be released. The shaping ball 207, under the pressure of the sleeve, squeezes the ball holder 208 and the core shaft 204 inward, and the core shaft 204 compresses the spring 203 upward. The ball holder 208 contacts the smallest outer circle of the core shaft 204, so that the shaping ball 207 retreats into the body 205 for easy removal.

[0048] In this embodiment, the upper piston 102, the cylinder body 104 and the lower piston 106 form a hydraulic space together. The upper piston 102 is provided with a piston hole 1021, and the piston hole 1021 is used to connect the channel with the hydraulic space to allow the pressurized liquid to enter the hydraulic space. The cross-sections of the upper piston 102 and the lower piston 106 are generally T-shaped with holes inside, and the cross-section of the cylinder body 104 is a two-clawed rake type with holes inside. The upper part of the cylinder body 104 is sleeved on the outer circle of the small end of the upper piston 102, and the internal threaded hole of the large end of the lower piston 106 is sleeved on the external thread of the small end of the upper piston 102, so that there is a longitudinal distance between the top surface of the outer circle of the large end of the lower piston 106 and the upper bottom surface of the cylinder body 104.

[0049] Among them, the lower piston 106 is installed in the lower inner hole of the cylinder body 104, and the outer circle of the large end of the lower piston 106 contacts the lower inner hole of the cylinder body 104, so that an annular space is formed between the outer circle of the small end of the upper piston 102 and the lower inner hole of the cylinder body 104. The lower small outer circle end of the lower piston 106 is connected with a connecting sleeve 107 through a thread. In this way, the upper piston 102, the cylinder body 104, and the lower piston 106 are surrounded to form an annular hydraulic space, and a piston hole 1021 is opened at the lower small outer circle of the upper piston 102 to communicate with the hydraulic space, so that the pressurized liquid in the channel can enter the hydraulic space from the piston hole 1021, and continuously accumulate until the pressure becomes large, thereby pushing the upper piston 102, the lower piston 106 and the connecting sleeve 107, and pushing the body of the shaper 200 downward.

[0050] In some other embodiments, a pressure relief space is enclosed between the upper piston 102, the cylinder body 104 and the upper cylinder body 101, and the upper cylinder body 101 is provided with a cylinder body hole 1011, and the cylinder body hole 1011 is used to connect 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, and the hydraulic resistance generated by the liquid in the pressure relief space to the downward movement of the piston 102 is eliminated. In this embodiment, the upper large outer circle end of the upper piston 102 is sealed and built into the lower inner hole of the upper cylinder body 101, and the lower small outer circle end of the upper piston 102 is sealed and built into the upper small inner hole of the cylinder body 104, so that the upper top surface of the cylinder body 104 and the upper bottom surface of the upper piston 102 have a longitudinal distance; the upper outer side of the cylinder body 104 is connected to the upper cylinder body 101, so that an annular space is formed between the lower small outer circle of the upper piston 102 and the lower inner hole of the upper cylinder body 101. In this way, an annular pressure relief space is enclosed between the three, and a cylinder hole 1011 is opened on the outer side of the upper cylinder body 101 to communicate with the lower edge of the annular pressure relief space. When the upper piston 102 moves downward under the action of liquid pressure, the height of the annular pressure relief space gradually decreases, and the liquid in the annular space is squeezed out from the cylinder hole 1011, thereby avoiding the problem of difficulty in the upper piston 102 moving downward due to the incompressibility of the liquid.

[0051] In another embodiment, a circulation hole 1071 is provided on the connecting sleeve 107, a cylinder hole 1041 is provided on the cylinder body 104, the circulation hole 1071 is connected to the channel, the cylinder hole 1041 is connected to the outside, and the circulation hole 1071 and the cylinder hole 1041 are connected to form a flow passage to allow the pressurized liquid to flow and realize the function of flushing the casing. In this embodiment, when the casing is shaped, the present invention is connected to the lower end of the tubing string and lowered above the position where the casing is deformed and reduced in diameter. The position where the casing needs to be shaped can be circulated and flushed through the cylinder hole 1041 and the circulation hole 1071, and then a resin ball (or steel ball) is inserted from the inner hole of the tubing string to the conical surface 1081 of the ball seat 108 to achieve sealing, and then the expansion sleeve operation is performed.

[0052] In a further embodiment, Figure 1 As shown, a ball seat 108 is provided in the connecting sleeve 107, and a conical surface 1081 is provided inside the ball seat 108. The ball seat 108 is a ring-like part, and its inner hole is divided into three parts, the upper part is a large inner hole with a larger diameter, and the lower part is a small inner hole with a smaller diameter. There is a smooth conical surface 1081 between the large inner hole and the small inner hole for realizing line sealing with the resin ball (or 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 that the forward and reverse washing functions and the compression and expansion sleeve functions can be selected according to construction requirements.

[0054] like Figure 2As shown, the supercharger further includes a shear nail seat 110 and a plurality of shear nails 111. The shear nail 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 to the cylinder body 104. Each of the shear nails 111 passes through the shear nail seat 110 and is threadedly connected to the shear nail seat, and the small end of the shear nail is inserted into a circle of annular grooves (with a rectangular longitudinal section) 1072 on the small outer circle of the connecting sleeve 107. Specifically, a circulation hole 1071 is radially provided in the middle of the inner hole of the connecting sleeve 107 to communicate with the channel, and a left-handed internal thread 1074 is provided at the lower part of the inner hole. The outer part is composed of two parts, an upper small outer circle and a lower large outer circle. The lower part of the small outer circle has a circle of annular grooves (with a rectangular longitudinal section) 1072, and the upper part of the large outer circle has a plurality of torsion tooth grooves 1073 with a rectangular cross-section (or a keyway shape), and the number of torsion tooth grooves is preferably 4 (or 2-6).

[0055] like Figure 3 As shown, the shear nail seat 110 is a pipe-like part with a through hole inside. Its outside is composed of three sections, the upper part is a common external thread, and the middle part is an outer circle with a diameter larger than the upper part. The lower part is 4 (or 2-6) rectangular or inverted trapezoidal torsion teeth 1101, which can be inserted into the torsion tooth groove 1073 on the upper part of the large outer circle at the lower end of the connecting sleeve 107. There are 4 (or 6) threaded holes on the large outer circle in the middle part that are connected to the internal through hole, and each threaded hole is equipped with a shear nail, and the small end of the shear nail 111 is inserted into the annular groove 1072 on the outer circle of the connecting sleeve 107.

[0056] In some other embodiments, the core shaft 204 is provided with a plurality of first contact surfaces 2042 along the axial direction, the wall surface of the ball holder 208 that contacts the core shaft 204 is a second contact surface 2082, and the first contact surface 2042 and the second contact surface 2082 are matched. Figure 1 As shown, there are multiple rows of threaded holes from top to bottom on the outer circle of the body 205, with 6 (or 4-8) holes in each row, evenly distributed on the circumference, and a shaping ball seat 206, a shaping ball 207 and a ball holder 208 are installed in each threaded hole.

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

[0058] like 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 that conflicts with the core shaft 204 is a second contact surface 2082. The second contact surface 2082 can be a convex spherical surface (or an outer conical surface). There are multiple first contact surfaces 2042 arranged in sequence along the axial direction on the outer circle of the core shaft 204, and the first contact surface 2042 can be an outer conical surface or a convex spherical surface or an arc surface. Each first contact surface 2042 corresponds to a row of convex spherical surfaces (or outer conical surfaces) of the ball holder 208. The ball holder 208 is provided to improve the stress condition of the shaping ball 207 and prevent the shaping ball 207 from being damaged due to stress concentration.

[0059] By setting an outer conical surface on the core shaft 204, when the outer conical surface moves forward or backward under the action of the supercharger 100, it can drive the ball holder 208 and the shaping ball 207 to extend out of the body 205 or retract into the body 205. When the shaping ball 207 extends out of the body 205, the outer diameter of the shaper increases, and the shaping ball is used to squeeze and deform the inner diameter of the casing to enlarge it to achieve casing shaping; when the shaping ball 207 is retracted into the body 205, the outer diameter of the shaper 200 decreases, and when the construction pipe string (generally an oil pipe string) is lifted, the tool can be withdrawn from the casing and the well section is changed, so that the tool can be retracted.

[0060] See again Figure 1 As shown, the upper end of the threaded rod 201 is a left-handed external thread, and the shaper 200 and the supercharger 100 are both independent assemblies, and the two are connected by a left-handed trapezoidal thread, and the shaper 200 of different outer diameters can be disassembled and replaced before going down the well. In this way, by designing a left-handed connecting thread between the supercharger 100 and the shaper 200, the supercharger 100 and the shaper 200 can be disengaged from the construction pipe column in a forward rotation and withdrawn from the construction pipe column to avoid the construction pipe column being stuck. The shaper 100 and the supercharger 200 are connected by a left-handed trapezoidal thread, and can be disassembled as a whole. For a more serious casing change section, by replacing shapers of different sizes, step-by-step shaping from small to large can be achieved.

[0061] The application process of the present invention is:

[0062] When performing casing shaping, the present invention is connected to the lower end of the tubing string and lowered to above the position where the casing is deformed and reduced in diameter. The position where the casing needs to be shaped is circulated and flushed through the cylinder hole 1041 and the circulation hole 1071. A resin ball (or steel ball) is inserted from the inner hole of the tubing string to the conical surface 1081 of the ball seat 108 to achieve sealing. Then, pressure is applied to the inside of the string. The upper piston 102, the lower piston 106, and the connecting sleeve 107 of the supercharger 100 push the shaper 200 body downward under the action of the liquid pressure. At the same time, the threaded rod 201 compresses the spring 203 and moves downward by a distance of the retreat space 2041, pushing the core shaft 204 downward so that the outer conical surface on it pushes the ball holder 208 outward so that part of the spheres of all the shaping balls 207 protrude out of the body 205, and the outer diameter of the shaper 200 increases; the shaper 200 moves downward, and the shaping balls 207 squeeze the sleeve outward while rolling downward, gradually expanding the shrunken and deformed sleeve downward to restore it to its normal diameter.

[0063] When the expansion sleeve construction is completed or cannot be completed due to excessive resistance, stop pressurizing the tubing string and release the pressure in the tubing string. The shaping ball 207 can push the ball holder 208 to squeeze the outer conical surface of the core shaft 204 under the contact and compression of the inner wall of the casing, so that the core shaft 204 compresses the spring 203 upward, and the ball holder 208 contacts the smallest outer circle of the core shaft 204. The shaping ball 207 shrinks into the body 205 accordingly, and the outer diameter of the shaper 200 becomes smaller for easy removal.

[0064] When the main body 205 is stuck in the casing deformation and reduced diameter section due to excessive resistance of the expansion sleeve, the tubing string can be lowered and slowly rotated forward, so that the torsion teeth 1101 at the lower end of the shear nail seat 110 are inserted into the torsion groove 1073 on the large outer circle of the lower end of the connecting sleeve 107, and the tubing string is rotated forward continuously, and the left-handed thread 1074 at the lower part of the inner hole of the connecting sleeve 107 is disengaged from the left-handed thread at the upper part of the threaded rod 201, and the booster 100 and the tubing string are pulled out of the well together to avoid getting stuck in the construction string. When shaping the more serious casing deformation section, it can be shaped step by step from small to large by replacing the shapers 200 with different outer diameters.

[0065] Therefore, the present invention provides a retractable hydraulic casing shaping device, which can expand the deformed reduced diameter section of the casing by pressing, and has the advantages that the ball bearing is not easy to break, the tool has a long service life, and the construction pipe column can be withdrawn when the tool is stuck to avoid drill jamming. In addition, shapers of different sizes can be replaced on the ground, so that the present invention has the ability to repair more serious casing deformation.

[0066] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational 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 that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant 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 also includes elements inherent to such process, method, article or terminal device.

[0068] The above is a detailed introduction to a retractable hydraulic casing shaping device provided by the present application. The principle and implementation method of the present application are described in detail using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those skilled in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A retractable hydraulic casing shaping device, characterized in that: include: An axially arranged supercharger and a shaper, wherein an internal opening of the supercharger forms a channel for receiving a pressurized fluid; The supercharger comprises a supercharger body and a hydraulic booster mechanism disposed radially inwardly of the supercharger body, wherein the hydraulic booster mechanism is configured to apply the hydraulic pressure of the supercharged fluid to the shaper; wherein the shaper comprises: A shaping body and a threaded rod and a core shaft both located radially inside the shaping body, wherein the axial upper end of the threaded rod is connected to the hydraulic boosting mechanism, and the axial lower end forms a retreat space with the upper end surface of the core shaft; wherein, At least one ball holder is movably embedded on the shaping body, one end of each ball holder contacts the core shaft, and a shaping ball is correspondingly arranged in each ball holder; The threaded rod receives the hydraulic pressure transmitted from the hydraulic booster mechanism, moves axially downward to contact the upper end surface of the core shaft, pushes down the core shaft, and causes the core shaft to push the ball holder radially outward, so that at least part of the spherical body of the shaping ball is exposed from the shaping body.

2. A retractable hydraulic casing shaping device according to claim 1, characterized in that: The booster body comprises an upper cylinder body and a cylinder body, wherein the inner side of the upper part of the upper cylinder body is provided with a thread for connecting to an oil pipe string; the lower part of the upper cylinder body is connected to the upper part of the cylinder body; The hydraulic boosting mechanism comprises an axially connected upper piston, a lower piston and a connecting sleeve, the radial outer side of the upper piston is sealed with the upper cylinder body and the cylinder body, the radial outer side of the lower piston is sealed with the cylinder body and is sealingly connected with the connecting sleeve.

3. A retractable hydraulic casing shaping device according to claim 2, characterized in that: The supercharger also includes a shear pin seat and a plurality of shear pins. The shear pin seat is located in an annulus 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 of the shear pins passes through the shear pin seat and is inserted into an annular groove on the connecting sleeve.

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

5. The retractable hydraulic casing shaping device according to claim 1, characterized in that: A spring is installed in the top end of the core shaft, and the top end of the spring abuts against the threaded rod.

6. A retractable hydraulic casing shaping device according to claim 2, characterized in that: The upper piston, the cylinder body and the lower piston together form a hydraulic space. The upper piston is provided with a piston hole, and the piston hole is used to connect the channel with the hydraulic space to allow the pressurized fluid to enter the hydraulic space.

7. A retractable hydraulic casing shaping device according to claim 2, characterized in that: A circulation hole is provided on the connecting sleeve, and a cylinder hole is provided on the cylinder body. The circulation hole is connected to the channel, and the cylinder hole is connected to the outside. The circulation hole and the cylinder hole are connected to form a flow channel to allow the pressurized liquid to flow, thereby realizing the function of flushing the sleeve.

8. The retractable hydraulic casing shaping device according to claim 1, characterized in that: A ball seat is arranged on the radial inner side of the connecting sleeve, and a conical surface is provided on the radial inner side of the ball seat.

9. The retractable hydraulic casing shaping device according to claim 1, characterized in that: The core shaft is provided with a plurality of first contact surfaces along the axial direction, the wall surface of the ball holder that contacts the core shaft is a second contact surface, and the first contact surface and the second contact surface match each other.

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

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