Hydraulic positioning reentry tool for multilateral wellbore

Abstract

The invention provides a multilateral well hole hydraulic positioning reentry tool which comprises a pressurizing cylinder, and a pressurizing cavity is formed in the pressurizing cylinder. The piston mechanism is arranged in the pressurizing cavity, and the piston mechanism stretches out and draws back along with the pressure of fluid in the pipe; the lower joint is arranged at the lower end of the pressure cylinder and can rotate at a certain angle; at the beginning, the piston mechanism is in a contraction state, and the lower connector is in a vertical state. And when entering a multilateral well, the piston mechanism extends downwards under the action of fluid pressure in the pipe, so that the lower joint is pushed to be changed into an inclined state.

Description

Technical Field

[0001] The invention relates to a branch wellbore hydraulic positioning re-entry tool, belonging to the field of downhole tools in the oil and natural gas industry. Background Art

[0002] Branch well drilling and completion technology is an oil recovery technique that involves drilling multiple branches from a single main wellbore to exploit multiple reservoirs or faults. This technique, developed based on directional, highly deviated, and horizontal well technologies, offers several distinct advantages. It can increase the drainage area per well, improve reservoir recovery, and reduce the number of well sites, platform facilities, and drilling footage required, thereby reducing costs and improving investment returns.

[0003] However, the re-entry problem of branch wellbores continues to plague researchers, particularly those in the upper wellbore. Existing methods for branch wellbore re-entry include: 1. Using a pre-set locator on the casing and a branch wellbore guide to guide the tubing into the branch wellbore; 2. Designing a re-entry tool with adjustable curvature, or a bend joint, directly connects the tubing to the tool, adjusts the angle at the branch wellbore, and guides the tubing into the branch wellbore. However, existing angle adjustment methods are complex and inconvenient to operate. Summary of the Invention

[0004] In response to the above-mentioned technical problems existing in the prior art, the present invention proposes a branch wellbore hydraulic positioning re-entry tool, which realizes the curvature of the ground-controllable drilling tool, facilitates wellbore re-entry and special downhole operations, protects the wellbore, and ensures the passability of the drill string when lifting or lowering.

[0005] The present invention proposes a branch wellbore hydraulic positioning reentry tool, comprising:

[0006] A boosting cylinder, wherein a boosting chamber is provided in the boosting cylinder;

[0007] A piston mechanism disposed in the pressurizing chamber, the piston mechanism expanding and contracting according to the pressure of the fluid in the tube; and

[0008] A lower joint provided at the lower end of the boosting cylinder, the lower joint being configured to be rotatable at a certain angle;

[0009] Among them, initially, the piston mechanism is in a contracted state and the lower joint is in a vertical state; when entering the branch well, the piston mechanism extends downward under the action of the fluid pressure in the pipe, thereby pushing the lower joint to transform into an inclined state.

[0010] A further improvement of the present invention is that one or more boosting chambers are provided in the boosting cylinder, the piston mechanism includes one or more piston units, the number of the piston units corresponds to the number of the boosting chambers, and the piston units are provided in the boosting chambers.

[0011] A further improvement of the present invention is that the boost chamber includes an upper hole with a larger inner diameter and a lower hole with a smaller inner diameter, the upper hole is arranged above the lower hole, and a boost chamber step is formed between the upper hole and the lower hole.

[0012] A further improvement of the present invention is that a core hole is provided in the middle of the piston unit and a piston step is provided on the outside, the portion above the piston step forms an upper piston body with a larger outer diameter, and the portion below the piston step forms a lower piston body with a smaller outer diameter;

[0013] The upper piston body is slidably connected in the upper hole, and the lower piston body is slidably connected in the lower hole.

[0014] A further improvement of the present invention is that a spring is provided in the annular cavity between the boost chamber step and the piston step.

[0015] A further improvement of the present invention is that an upper joint is provided at the upper end of the boost chamber, a water hole is provided in the middle of the upper joint, and a first notch is provided at the lower end of the upper joint;

[0016] The lower end of the piston unit is provided with a second notch.

[0017] A further improvement of the present invention is that a lower cavity is provided at the lower part of the boosting cylinder, and a locking sleeve is connected to the lower end of the boosting cylinder; an upper joint inner spherical surface is provided at the lower end of the lower cavity, and a lower joint spherical surface is provided inside the locking sleeve, and the lower joint spherical surface and the upper joint spherical surface constitute a spherical center cavity.

[0018] A further improvement of the present invention is that the upper end of the lower joint is connected to a ball joint, and the connecting ball joint includes a joint ball rotatably arranged in the spherical center cavity, the upper end of the joint ball is provided with an upper column located in the lower cavity, and the lower end of the joint ball is provided with a lower column connected to the lower joint.

[0019] A further improvement of the present invention is that a bevel guide block is provided inside the lower cavity, the bevel guide block is provided between the piston mechanism and the ball joint, and a bevel is provided at the lower end of the bevel guide block.

[0020] A further improvement of the present invention is that one side of the upper cylinder is a vertical outer arc surface, and the other side is provided with an inclined outer arc surface; the lower end of the locking sleeve is provided with a bell mouth, one side is provided with an inclined inner arc surface, and the other side is provided with a vertical inner arc surface;

[0021] When the lower joint is in a vertical state, a first space is formed between the inclined outer arc surface of the upper cylinder and the inner side surface of the lower cavity, and a second space is formed between the side surface of the lower cylinder, the inclined inner arc surface of the locking sleeve, and the outer wall of the lower cylinder;

[0022] When the lower joint is in an inclined state, a third space is formed between the vertical outer arc surface of the upper cylinder and the inner side surface of the lower cavity, and a fourth space is formed between the side surface of the lower cylinder, the vertical inner arc surface of the locking sleeve, and the outer wall of the lower cylinder.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The branch wellbore hydraulic positioning re-entry tool of the present invention realizes the curvature of the ground controllable drilling tool, facilitates wellbore re-entry and special downhole operations, protects the wellbore, and ensures the passability of the drill string when it is lifted or lowered.

[0025] The hydraulic positioning and re-entry tool for branch wellbores according to the present invention has a relatively simple overall structure, high reliability, and high cost-effectiveness. The tool can normally transmit axial tension and rotational torque to the drill string. When running in or out of the hole, the pump is stopped, and a spring pushes the piston back to release the bending force on the drill string. The drill string can then be raised or lowered, and the drill string can slide up and down along the wellbore trajectory, improving the drill string's maneuverability.

[0026] The hydraulic positioning re-entry tool for branch wells of the present invention can easily achieve the required angle matching on site by replacing the guide assembly, including the guide block, ball joint and locking sleeve. It can easily achieve different angles of 0 to 15 degrees.

[0027] The hydraulic positioning reentry tool for branch wells, according to the present invention, utilizes a dual-piston booster cylinder design to assist in powerful drill string deflection. The number of booster cylinders can be increased or decreased based on actual needs. Production is standard with one booster cylinder, a two-stage piston, which provides twice the deflection force of a single-stage piston. Adding a second booster cylinder increases the piston to a four-stage position, meaning the deflection force is four times that of a single-stage piston. This design is particularly suitable for applications with low displacement and low internal and external pressure differentials. Replacing nozzles of different diameters can achieve varying water pressure drops at the drill string, thereby adjusting the deflection force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0029] Figure 1 FIG2 is a schematic structural diagram of a branch wellbore hydraulic positioning reentry tool according to an embodiment of the present invention, showing the lower joint in a vertical state;

[0030] Figure 2FIG2 is a schematic structural diagram of a branch wellbore hydraulic positioning reentry tool according to an embodiment of the present invention, showing a lower joint in an inclined state;

[0031] Figure 3 Shown is a schematic structural diagram of a booster cylinder according to an embodiment of the present invention;

[0032] Figure 4 FIG2 is a schematic structural diagram of a guide block according to an embodiment of the present invention;

[0033] Figure 5 Shown is a structural schematic diagram of a connecting ball joint according to an embodiment of the present invention;

[0034] Figure 6 Shown is a schematic structural diagram of a locking sleeve according to an embodiment of the present invention.

[0035] The drawings are not drawn to scale.

[0036] The meanings of the reference numerals in the accompanying drawings are as follows:

[0037] 1. Booster cylinder, 2. Upper joint, 3. Lower joint, 4. Piston mechanism, 5. Ball joint, 6. Locking sleeve, 7. Guide block, 11. Booster chamber, 12. Upper hole, 13. Lower hole, 14. Booster chamber step, 15. Lower chamber, 16. Inner spherical surface of upper joint, 17. Sieve hole, 21. Water eye, 22. First slot, 41. Upper piston body, 42. Lower piston body, 43. Piston step, 44. Spring, 45. Second slot, 51. Joint sphere, 52. Upper cylinder, 53. Lower cylinder, 54. First space, 55. Second space, 56. Third space, 57. Fourth space, 61. Inner spherical surface of lower joint, 62. Bell mouth, 71. Inclined surface. DETAILED DESCRIPTION

[0038] To make the technical solutions and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, and are not exhaustive. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0039] Branch well drilling and completion technology is an oil recovery technique that involves drilling multiple branches from a single main wellbore to exploit multiple reservoirs or faults. This technique, developed based on directional, highly deviated, and horizontal well technologies, offers several distinct advantages. It can increase the drainage area per well, improve reservoir recovery, and reduce the number of well sites, platform facilities, and drilling footage required, thereby reducing costs and improving investment returns.

[0040] However, the re-entry problem of branch wellbores continues to plague researchers, particularly those in the upper wellbore. Existing methods for branch wellbore re-entry include: 1. Using a pre-set locator on the casing and a branch wellbore guide to guide the tubing into the branch wellbore; 2. Designing a re-entry tool with adjustable curvature, or a bend joint, directly connects the tubing to the tool, adjusts the angle at the branch wellbore, and guides the tubing into the branch wellbore. However, existing angle adjustment methods are complex and inconvenient to operate.

[0041] To solve the above problems, the present invention proposes a hydraulic positioning re-entry tool for supporting wellbore, which realizes the curvature of the ground-controllable drilling tool, facilitates wellbore re-entry and special downhole operations, protects the wellbore, and ensures the passability of the drill string when lifting or lowering.

[0042] In such Figure 1 In the illustrated embodiment, a branch wellbore hydraulic positioning reentry tool comprises:

[0043] A boosting cylinder 1, wherein a boosting chamber 11 is provided in the boosting cylinder 1, wherein a piston mechanism 4 is provided in the boosting chamber 11, and wherein the piston mechanism 4 expands and contracts according to the pressure of the fluid in the tube;

[0044] A lower joint 3 is provided at the lower end of the boosting cylinder 1, and the lower joint 3 is configured to be rotatable at a certain angle;

[0045] Among them, at the beginning, the piston mechanism 4 is in a contracted state and the lower joint 3 is in a vertical state; when entering the branch well, the piston mechanism 4 extends downward under the action of the fluid pressure in the pipe, thereby pushing the lower joint 3 to change to an inclined state (such as Figure 2 shown).

[0046] In the branch wellbore hydraulic positioning re-entry tool described in this embodiment, before the tool is put into the well, the drill bit nozzle size and other factors are calculated based on the required deflection force. The drill bit is connected and lowered into the well. According to the drill bit orientation signal display, the drill bit is rotated so that the high side of the drill bit points to the target orientation of the branch well to be re-entered. The pump circulation is started, the displacement and riser pressure reach the designed parameter values, the fluid pushes the piston mechanism 4 to extend, and the piston pushes the lower joint 3 to rotate and move the angle, thus changing to the inclined state.

[0047] Slowly drill down and determine whether the branch well has been successfully re-entered based on the MWD azimuth signal display. If the drill string reaches the target well depth and there is still no imported azimuth display, it is necessary to pull the drill string back to the initial working position and repeat the above operation until the target branch well re-entry task is completed.

[0048] The drill string continues to descend to the target depth of the branch well to carry out the planned operation.

[0049] When the operation is completed, the pump is stopped, the piston mechanism 4 is pushed to reset, the bending force of the drill tool is released, the drill string is lifted, and the drill string slides along the wellbore trajectory to complete the drilling.

[0050] In one embodiment, the boosting cylinder 1 is provided with one or more boosting chambers 11, which are interconnected, and the piston mechanism 4 includes one or more piston units, the number of which corresponds to the number of the boosting chambers 11, and the piston units are provided in the boosting chambers 11. Figure 1 In the illustrated embodiment, there are two pressurizing chambers 11 and two piston units, and the two piston units are respectively disposed in the two pressurizing chambers 11 .

[0051] In one embodiment, Figure 3 As shown, the boost chamber 11 includes an upper hole 12 with a larger inner diameter and a lower hole 13 with a smaller inner diameter. The upper hole 12 is arranged above the lower hole 13, and a boost chamber step 14 is formed between the upper hole 12 and the lower hole 13.

[0052] The piston unit has a core hole in the middle and a piston step 43 on the outside. The portion above the piston step 43 forms an upper piston body 41, and the portion below forms a lower piston body 42. The outer diameter of the upper piston body 41 is greater than that of the lower piston body 42.

[0053] The outer diameter of the upper piston body 41 matches the inner diameter of the upper hole 12 of the boosting chamber 11, and the outer diameter of the lower piston body 42 matches the inner diameter of the lower hole 13 of the boosting chamber 11; the upper piston body 41 is sleeved in the upper hole 12 and can slide in the upper hole 12; the lower piston body 42 is sleeved in the lower hole 13 and can slide in the lower hole 13.

[0054] A sliding seal is provided between the upper piston body 41 and the upper hole 12 , and a sliding seal is also provided between the lower piston body 42 and the lower hole 13 .

[0055] A spring 44 is provided in the annular cavity between the boost chamber step 14 and the piston step 43 .

[0056] Initially, the elastic force of spring 44 pushes the piston unit into a retracted state, with the entire unit located above the pressurizing chamber 11. When the fluid pressure from above applies a thrust to the piston unit, this thrust overcomes the elastic force of spring 44 and pushes the piston unit downward, causing the lower portion of the piston unit to extend downward. This further thrust is applied to the piston unit below or the lower connector 3, causing the lower connector 3 to transition from its initial vertical state to an inclined state, matching the branch well.

[0057] In one embodiment, an upper joint 2 is provided at the upper end of the boost chamber 11, a water hole 21 is provided in the middle of the upper joint 2, and an inwardly concave conical surface is provided at the lower end, so that a first notch 22 is formed at the upper end of the piston unit.

[0058] The pressure of the fluid is transmitted to the first notch 22 through the water hole 21 and then to the upper end surface of the piston unit, pushing the upper end surface of the piston unit, thereby forming a downward thrust.

[0059] In a preferred embodiment, a second notch 45 is provided at the lower end of the piston unit.

[0060] The fluid flows in the core hole of the piston unit, and the pressure of the fluid is transmitted to the top of the piston unit below through the second notch 45, and pushes the upper end surface of the piston unit below, thereby forming a downward thrust.

[0061] In one embodiment, a lower cavity 15 is provided at the lower portion of the boosting cylinder 1, and a locking sleeve 6 is connected to the lower end of the boosting cylinder 1;

[0062] The upper end of the lower joint 3 is connected to the ball joint 5 , and the ball joint is arranged in the locking sleeve 6 and the lower cavity 15 .

[0063] In a preferred embodiment, Figure 5 As shown, the ball joint includes a joint ball 51 located in the middle, and the outer surface of the joint ball 51 is a spherical surface; an upper column 52 is provided at the upper end of the joint ball 51, and a lower column 53 is provided at the lower end.

[0064] The lower column 53 is connected to the lower connector 3 .

[0065] An upper joint inner spherical surface 16 is provided at the lower end of the lower cavity 15 , a lower joint spherical surface is provided inside the locking sleeve 6 , and the joint sphere 51 is provided in the spherical cavity formed by the upper joint inner spherical surface 16 and the lower joint inner spherical surface 61 .

[0066] The ball joint can rotate in the spherical center cavity formed by the upper joint inner spherical surface 16 and the lower joint inner spherical surface 61 through the joint ball 51, thereby changing the angle of the lower joint 3 at the lower end, thereby completing the rotation angle of the lower joint 3.

[0067] In the present invention, the joint ball 51 is preferably a spherical surface, and may also be an ellipsoid, or even a column-like structure or other rotatable arc-shaped structure.

[0068] In one embodiment, a guide block 7 is provided inside the lower cavity 15, and the guide block 7 is provided between the piston mechanism 4 and the ball joint. The lower end of the guide block 7 is provided with an inclined surface (such as Figure 4shown).

[0069] Initially, a certain angle is formed between the inclined surface at the lower end of the guide block 7 and the top of the upper column 52, and a certain distance is maintained between the guide block 7 and the ball joint.

[0070] When the piston mechanism 4 extends, it pushes the guide block 7 downward, so that the inclined surface of the guide block 7 contacts the upper end surface of the main body, and then pushes the ball joint to rotate along the joint ball 51, so that the lower joint 3 is deflected.

[0071] In this embodiment, the bevel guide block 7 is easy to disassemble, and can be replaced with bevel guide blocks 7 with different inclinations to meet the needs of branch wells at different angles.

[0072] In one embodiment, one side of the upper cylinder 52 is a vertical outer arc surface, and the other side is provided with an inclined outer arc surface.

[0073] The lower end of the locking sleeve 6 is provided with a bell mouth 62 (such as Figure 6 As shown), an inclined inner arc surface is provided on one side, and a vertical inner arc surface is provided on the other side;

[0074] When the lower connector 3 is in a vertical state, a first space 54 is formed between the inclined outer arc surface of the upper cylinder 52 and the inner side surface of the lower cavity 15, and a second space 5653 is formed between the side surface of the lower cylinder 53, the inclined inner arc surface of the locking sleeve 6, and the outer wall of the lower cylinder 53.

[0075] When the lower joint 3 is in an inclined state, a third space is formed between the vertical outer arc surface of the upper column 52 and the inner side surface of the lower cavity 15, and a fourth space 57 is formed between the side surface of the lower column 53, the vertical inner arc surface of the locking sleeve 6, and the outer wall of the lower column 53.

[0076] For example Figure 1 and Figure 2 As shown, the upper cylinder 52 has a first arc surface on the left side and a second arc surface on the right side; the lower cavity 15 has a third arc surface on the left side and a third arc surface on the right side. The first and second arc surfaces are outer arc surfaces, while the third and fourth arc surfaces are inner arc surfaces.

[0077] The first arc surface, the third arc surface and the fourth arc surface are all vertical arc surfaces, and the second arc surface is an inclined arc surface, with the inclined direction toward the inside of the central axis.

[0078] There is a certain angle between the first arc surface and the second arc surface, and the angle matches or is greater than the angle between the inclined surface at the lower end of the bevel guide block 7 and the top of the upper column 52. Since the inclined surfaces of different bevel guide blocks 7 are different, the angles between them and the upper column 52 are also different. It is sufficient to ensure that the angle between the bevel guide block 7 with the largest inclined surface and the upper column 52 is the same as the angle between the first arc surface and the second arc surface.

[0079] The left side of the lower cylinder 53 is provided with a fifth arc surface, and the right side is provided with a sixth arc surface. The fifth and sixth arc surfaces are outer arc surfaces; the left side of the locking sleeve 6 is provided with a seventh arc surface, and the right side is provided with an eighth arc surface. The seventh and eighth arc surfaces are inner arc surfaces.

[0080] The fifth arc surface, the sixth arc surface and the eighth arc surface are all vertical arc surfaces, and the seventh arc surface is an inclined arc surface, with the inclined direction toward the outside of the central axis.

[0081] The seventh arc surface and the eighth arc surface have a certain included angle, and the included angle matches the included angle between the first arc surface and the second arc surface.

[0082] When the lower joint 3 is in a vertical state, the first arc surface is fitted with the third arc surface, and there is a certain activity space between the second arc surface and the fourth arc surface, which is the first activity space; the sixth arc surface is fitted with the eighth arc surface, and there is a certain activity space between the fifth arc surface and the seventh arc surface, which is the second activity space.

[0083] When the lower joint 3 is in an inclined state, there is a certain activity space between the first arc surface and the third arc surface, which is the third activity space; the second arc surface and the fourth arc surface are in contact with each other; there is a certain activity space between the sixth arc surface and the eighth arc surface, which is the fourth activity space, and the fifth arc surface and the seventh arc surface are in contact with each other.

[0084] In this embodiment, the locking sleeve 6 is connected to the booster cylinder 1 by a threaded connection, and the inner hole of the locking sleeve 6 is larger at the top and smaller at the bottom to prevent the ball joint from falling out. The lower end face of the locking sleeve 6 is an outer spherical surface that rotates with the inner spherical surface of the upper end face of the lower joint 3 to prevent debris from the bottom of the well from entering the tool and causing the tool to bend restricted.

[0085] When using the branch wellbore hydraulic positioning re-entry tool described in this embodiment, the parameters are first calculated based on the well conditions and the required deflecting force. The parameters include the drill bit nozzle size, the number of boosting chambers 11 and piston units and drilling parameters, the model of the guide block 7 (the inclination of the inclined surface of the guide block 7), etc.

[0086] Connect the hydraulic directional elbow to the drilling tool, record the MWD and the high side orientation of the elbow, and debug the target orientation and bifurcation depth of the branch well to be re-entered.

[0087] Drill down to near the upper part of the target well depth, record the initial working position, and according to the drill tool azimuth signal display, rotate the drill tool so that the high side of the drill tool points to the target azimuth of the branch well to be re-entered. Start the pump circulation, and the displacement and riser pressure reach the designed parameter values. The mud pressure pushes the piston mechanism 4 to overcome the pre-compression force of the spring 44 and descend synchronously with the guide block 7. The guide block 7 forms an angle with the upper end of the ball joint. During the downward process, it is opposite to the upper end face of the upper column 52 connected to the ball joint 5, thereby pushing the joint ball 51 to rotate, and the lower column 53 rotates a certain angle in the locking sleeve 6, thereby driving the lower joint 3 to rotate.

[0088] The drill string is lowered slowly and the MWD azimuth signal is displayed to determine whether the branch well has been successfully re-entered. If the drill string has reached the target well depth but no imported azimuth is displayed, the drill string needs to be lifted back to the initial working position and the above operation is repeated until the target branch well re-entry task is completed; the drill string continues to be lowered to the target well depth of the branch well to perform the operation; after the operation is completed, the pump is stopped, the spring 44 pushes the piston to reset, the drilling tool bending force is released, the drill string is lifted, and the drill string slides along the wellbore trajectory to start drilling.

[0089] The branch wellbore hydraulic positioning re-entry tool of the present invention realizes the curvature of the ground controllable drilling tool, facilitates wellbore re-entry and special downhole operations, protects the wellbore, and ensures the passability of the drill string when it is lifted or lowered.

[0090] The hydraulic positioning and reentry tool for branch wellbores according to the present invention has a relatively simple overall structure, and offers excellent reliability and cost-effectiveness. The tool can normally transmit axial tension and rotational torque to the drill string. When the pump is stopped during drilling or pulling out, spring 44 pushes the piston back, relieving the bending force on the drill string. The drill string can then be raised or lowered, allowing it to slide up and down along the wellbore trajectory, improving the drill string's maneuverability.

[0091] According to the branch wellbore hydraulic positioning re-entry tool of the present invention, by replacing the guide deflection assembly, including the guide deflection block 7, the ball joint and the locking sleeve 6, the required angle matching can be easily achieved on site. Different angles of 0 to 15 degrees can be easily adjusted.

[0092] The branch wellbore hydraulic positioning reentry tool of the present invention utilizes a dual-piston booster cylinder design to significantly boost the drill string's deflection force. The number of booster cylinders can be increased or decreased based on actual needs. The standard production configuration is one booster cylinder, a two-stage piston, which provides twice the deflection force of a single-stage piston. Adding another booster cylinder creates a four-stage piston, quadrupling the deflection force. This design is particularly suitable for applications with low displacement and low internal and external pressure differentials. Replacing nozzles of different diameters can achieve varying pressure drops within the drill string's water hole 21, thereby adjusting the deflection force.

[0093] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should extend to equivalent substitutions of these features understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting.

[0094] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0096] Certain terms are used throughout this specification to refer to specific system components. As those skilled in the art will appreciate, different names can often be used to refer to the same component, and thus this specification does not intend to distinguish between components that differ only in name, not function. References in this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout this specification do not necessarily refer to the same embodiment.

[0097] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

[0098] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made in accordance with the embodiments of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A branch wellbore hydraulic positioning reentry tool, characterized in that: include: A boosting cylinder (1), wherein a boosting chamber (11) is provided in the boosting cylinder (1); A piston mechanism (4) is disposed in the pressurizing chamber (11), wherein the piston mechanism (4) expands and contracts according to the pressure of the fluid in the tube; and A lower joint (3) is provided at the lower end of the boosting cylinder (1), and the lower joint (3) is configured to be rotatable at a certain angle; Initially, the piston mechanism (4) is in a contracted state, and the lower joint (3) is in a vertical state; when entering a branch well, the piston mechanism (4) extends downward under the action of the fluid pressure in the pipe, thereby pushing the lower joint (3) to transform into an inclined state.

2. The branch wellbore hydraulic positioning reentry tool according to claim 1, characterized in that: One or more boosting chambers (11) are provided in the boosting cylinder (1), and the piston mechanism (4) includes one or more piston units, the number of the piston units corresponds to the number of the boosting chambers (11), and the piston units are provided in the boosting chambers (11).

3. The branch wellbore hydraulic positioning reentry tool according to claim 2, characterized in that: The boost chamber (11) comprises an upper hole (12) with a larger inner diameter and a lower hole (13) with a smaller inner diameter. The upper hole (12) is arranged above the lower hole (13), and a boost chamber step (14) is formed between the upper hole (12) and the lower hole (13).

4. The branch wellbore hydraulic positioning reentry tool according to claim 3, characterized in that: The piston unit is provided with a core hole in the middle and a piston step (43) on the outside. The portion above the piston step (43) forms an upper piston body (41) with a larger outer diameter, and the portion below the piston step (43) forms a lower piston body (42) with a smaller outer diameter. The upper piston body (41) is slidably connected in the upper hole (12), and the lower piston body (42) is slidably connected in the lower hole (13).

5. The branch wellbore hydraulic positioning reentry tool according to claim 4, characterized in that: A spring (44) is arranged in the annular cavity between the boost chamber step (14) and the piston step (43).

6. The branch wellbore hydraulic positioning reentry tool according to claim 5, characterized in that: The upper end of the boost chamber (11) is provided with an upper joint (2), the middle portion of the upper joint (2) is provided with a water hole (21), and the lower end of the upper joint (2) is provided with a first notch (22); The lower end of the piston unit is provided with a second notch (45).

7. The branch wellbore hydraulic positioning reentry tool according to claim 6, characterized in that: The lower part of the boosting cylinder (1) is provided with a lower cavity (15), and the lower end of the boosting cylinder (1) is connected to a locking sleeve (6); the lower end of the lower cavity (15) is provided with an upper joint inner spherical surface (16), and the interior of the locking sleeve (6) is provided with a lower joint spherical surface, and the lower joint spherical surface and the upper joint spherical surface form a spherical center cavity.

8. The branch wellbore hydraulic positioning reentry tool according to claim 7, characterized in that: The upper end of the lower joint (3) is connected to a ball joint (5), and the connecting ball joint (5) includes a joint ball (51) rotatably arranged in a spherical cavity, the upper end of the joint ball (51) is provided with an upper column (52) located in the lower cavity (15), and the lower end of the joint ball (51) is provided with a lower column (53) connected to the lower joint (3).

9. The branch wellbore hydraulic positioning reentry tool according to claim 8, characterized in that: A guide block (7) is provided inside the lower cavity (15), and the guide block (7) is provided between the piston mechanism (4) and the ball joint. The lower end of the guide block (7) is provided with an inclined surface (71).

10. The branch wellbore hydraulic positioning reentry tool according to claim 9, characterized in that: One side of the upper cylinder (52) is a vertical outer arc surface, and the other side is provided with an inclined outer arc surface; the lower end of the locking sleeve (6) is provided with a bell mouth (62), one side is provided with an inclined inner arc surface, and the other side is provided with a vertical inner arc surface; When the lower joint (3) is in a vertical state, a first space (54) is formed between the inclined outer arc surface of the upper cylinder (52) and the inner side surface of the lower cavity (15), and a second space (56) (53) is formed between the side surface of the lower cylinder (53), the inclined inner arc surface of the locking sleeve (6), and the outer wall of the lower cylinder (53); When the lower joint (3) is in an inclined state, a third space is formed between the vertical outer arc surface of the upper column (52) and the inner side surface of the lower cavity (15), and a fourth space (57) is formed between the side surface of the lower column (53), the vertical inner arc surface of the locking sleeve (6), and the outer wall of the lower column (53).

Images