Drifting device for tie-back of underground tubular column

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By designing the well-through device of mandrel, sleeve and shoe lead, the problem of difficulty in well-through of downhole pipe columns is solved, the smooth entry of the well-through tool and the axial alignment of the downhole pipe columns is achieved, and the well-through efficiency and Construction rate.

CN222276629UActive Publication Date: 2024-12-31ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP

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Patent Information

Application Number: CN202421170954.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-27
Publication Date: 2024-12-31
Estimated Expiration: 2034-05-27

AI Technical Summary

Technical Problem

During the well repair process of oil and gas wells, the pipe columns in the well are cut or corroded and broken, resulting in difficulty in the lower pipe columns being well-opened and the well-opening tools being difficult to enter, which increases the difficulty of salvage operations.

Method used

A well-through device that connects the downhole pipe column is designed, including a mandrel, a sleeve and a guide shoe. Through the installation structure, step hole structure and slot, the well-through tool enters the downhole pipe column on the central axis. And trim and limit positioning through bevel surfaces and alloy teeth to avoid attitude deviation.

Benefits of technology

It effectively reduces the difficulty of well opening, improves the efficiency and construction rate of downhole pipe columns, ensures the alignment of the shaft center of the well opening tool with the downhole pipe column, and achieves smooth well opening operation.

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Abstract

The utility model relates to a drifting device for tie-back of an underground tubular column, which comprises a core shaft, a plurality of connecting rods and a plurality of connecting rods, one end of the sleeve is sleeved on the outer wall of the mandrel and is connected with the mounting structure; the guide shoe is in threaded connection with the other end of the sleeve; the outer walls of the sleeve and the guide shoe are in sliding connection with the inner wall of the oil-gas well inner sleeve; a first stepped hole structure and a second stepped hole structure are arranged in the guide shoe, and the first stepped hole structure is communicated with the second stepped hole structure; an underground pipe column is guided into the guiding shoe through the first stepped hole structure; the bottom end of the mandrel is connected with a drifting tool, and the mandrel can reciprocate in the sleeve and the guiding shoe in the vertical direction; and the drifting tool at the end of the mandrel is aligned with the underground pipe column through the second stepped hole structure, and the drifting tool is driven by the mandrel to stretch into the underground pipe column for drifting. The device is simple in structure and easy to operate, can effectively improve the efficiency of returning and well dredging of an underground pipe column, and effectively reduces the difficulty of well dredging.

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Description

Technical Field

[0001] The utility model relates to the technical field of oil production equipment, in particular to a well-clearing device for connecting back a downhole pipe column. Background Art

[0002] During the repair process of oil, gas and water wells, it is often encountered that the pipe string in the well is broken due to cutting or corrosion. After the broken upper pipe string is pulled out, the lower pipe string needs to be cleared. In this case, since the downhole pipe string is in the downhole casing, when a small-sized clearing tool is lowered, it is difficult to introduce the clearing tool into the lower pipe string in the casing for clearing the well, which makes the subsequent salvage operation in the lower pipe string very difficult. Utility Model Content

[0003] The utility model aims to solve at least one technical problem in the background technology and provide a well-clearing device for connecting back a downhole pipe string.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a well-clearing device for connecting back a downhole pipe string, comprising:

[0005] The mandrel has a mounting structure around its outer wall;

[0006] A sleeve, one end of which is sleeved on the outer wall of the core shaft and connected to the mounting structure;

[0007] A guide shoe, threadedly connected to the other end of the sleeve;

[0008] The outer walls of the sleeve and the guide shoe are slidably connected to the inner wall of the casing in the oil and gas well;

[0009] A first step hole structure and a second step hole structure are provided in the guide shoe, and the first step hole structure is connected to the second step hole structure;

[0010] Leading the downhole tubular string into the guide shoe through the first step hole structure;

[0011] The bottom end of the mandrel is connected to a well-drilling tool, and the mandrel can reciprocate in the vertical direction inside the sleeve and the guide shoe;

[0012] The well-clearing tool at the end of the mandrel is aligned with the downhole tubular column through the second step hole structure, and the well-clearing tool is extended into the downhole tubular column driven by the mandrel to clear the well.

[0013] According to one aspect of the utility model, the mounting structure includes a plurality of rectangular protrusions evenly spaced apart along the circumference of the core shaft.

[0014] According to one aspect of the utility model, a clamping groove is provided in the sleeve, and the clamping groove is clamped with the top end of the rectangular protrusion.

[0015] According to one aspect of the utility model, the end surface of the guide shoe sole is an inclined surface.

[0016] According to one aspect of the utility model, the first step hole structure includes a first transition hole, a first tapered traction hole and a first positioning and straightening hole which are sequentially connected from bottom to top and have gradually decreasing apertures;

[0017] The inner diameter of the first positioning and straightening hole is equal to the outer diameter of the downhole pipe string;

[0018] The inner wall of the first tapered traction hole is provided with alloy teeth for repairing the flatness of the end surface of the downhole pipe string.

[0019] According to one aspect of the utility model, the second step hole structure includes a second transition hole, a second tapered traction hole and a second positioning and straightening hole which are sequentially connected from top to bottom and have gradually decreasing apertures;

[0020] The second positioning and straightening hole is in communication with the first positioning and straightening hole;

[0021] The diameter of the second positioning and straightening hole is smaller than the diameter of the first positioning and straightening hole.

[0022] According to one scheme of the utility model, a well-clearing device for connecting back a downhole tubular column comprises: a core shaft, a mounting structure is provided around the outer wall; a sleeve, one end of which is sleeved on the outer wall of the core shaft and connected to the mounting structure; a guide shoe, threadedly connected to the other end of the sleeve; the outer walls of the sleeve and the guide shoe can be slidably connected to the inner wall of the casing in the oil and gas well; a first step hole structure and a second step hole structure are provided in the guide shoe, and the first step hole structure is connected to the second step hole structure; the downhole tubular column is introduced into the guide shoe through the first step hole structure; the bottom end of the core shaft is connected to a well-clearing tool, and the core shaft can reciprocate in the vertical direction inside the sleeve and the guide shoe; the well-clearing tool at the end of the core shaft is aligned with the downhole tubular column through the second step hole structure, and the well-clearing tool is extended into the downhole tubular column driven by the core shaft to clear the well. Such a configuration can ensure that the core shaft is on the central axis when driving the well-clearing tool into the casing of the oil and gas well through the sleeve and the guide shoe, ensuring that the core shaft drives the well-clearing tool to align with the downhole tubing in the casing of the oil and gas well, ensuring that when the core shaft moves downward, the well-clearing tool can smoothly enter the downhole tubing, thereby performing well-clearing operations. Not only that, the downhole tubing and the well-clearing tool at the end of the core shaft can be further corrected and limited through the first step hole structure and the second step hole structure in the guide shoe, and the axis of the downhole tubing and the well-clearing tool can be further ensured to correspond on the basis of the above structure, ensuring that the well-clearing tool and / or the downhole tubing will not have posture deviation, and ensuring that the well-clearing tool can smoothly enter the downhole tubing for well-clearing operations.

[0023] According to one scheme of the utility model, the mounting structure includes a plurality of rectangular protrusions evenly spaced along the circumference of the core shaft. A slot is provided in the sleeve, which is arranged corresponding to the rectangular protrusion and is engaged with the top of the rectangular protrusion. That is, after the sleeve is sleeved on the outer wall of the core shaft from above, the top of each slot cooperates with the top of the rectangular protrusion to abut against the sleeve, thereby achieving sleeve engagement and support on the outer wall of the core shaft. With such an arrangement, if the positions of the sleeve and the guide shoe are fixed, the core shaft can reciprocate at the position below the sleeve, thereby driving the well-clearing tool to perform well-clearing operations on the downhole tubing, thereby achieving fast and convenient salvage operations.

[0024] According to one solution of the utility model, the end surface of the bottom end of the guide shoe is an inclined surface. With such a configuration, the guide shoe can be formed into a wall hook type guide shoe, one side of which forms a cone that can be closely attached to the inner wall of the casing in the well, so that when the guide shoe moves downward, the tapered side can form a traction and guidance function, thereby improving the ability to guide the top end of the downhole pipe string into its core when moving downward, ensuring that the downhole pipe string can smoothly enter the range of the first step hole structure, thereby improving the construction rate and subsequent well clearance efficiency.

[0025] According to one scheme of the utility model, the first step hole structure includes a first transition hole, a first tapered traction hole and a first positioning and straightening hole which are connected in sequence from bottom to top and whose apertures gradually decrease; the inner diameter of the first positioning and straightening hole is equal to the outer diameter of the downhole pipe string; the inner wall of the first tapered traction hole is provided with alloy teeth for repairing the flatness of the end face of the downhole pipe string. With such a configuration, after the top end of the downhole pipe string is introduced into the first transition hole through the above-mentioned inclined surface, the top end of the downhole pipe string will enter the first tapered traction hole through the first transition hole, at which time the alloy teeth and other structures on the inner wall of the first tapered traction hole will trim the top end of the downhole pipe string to ensure that the top end of the downhole pipe string is flat, and the trimmed top end of the downhole pipe string enters the first positioning and straightening hole through the guidance of the first tapered traction hole, and finally the downhole pipe string is limited and positioned through the first positioning and straightening hole, thereby ensuring the verticality of the downhole pipe string and its position accuracy, so that it is convenient for the well-drilling tool to align with it and enter the downhole pipe string for well-drilling operation.

[0026] According to one solution of the utility model, the second step hole structure includes a second transition hole, a second tapered traction hole and a second positioning and straightening hole which are sequentially connected from top to bottom and whose apertures gradually decrease; the second positioning and straightening hole is connected to the first positioning and straightening hole; the aperture of the second positioning and straightening hole is smaller than the aperture of the first positioning and straightening hole. With such a configuration, the well-drilling tool at the end of the mandrel can be guided through the second transition hole and the second tapered traction hole, and the well-drilling tool can be guided into the second positioning and straightening hole, so as to correspond with the end of the downhole tubular in the first positioning and straightening hole, realize the centering operation, and ensure that the well-drilling tool is aligned with the axis of the downhole tubular, so that when the well-drilling tool continues to be driven downward by the mandrel, the well-drilling tool can smoothly enter the interior of the downhole tubular to perform well-drilling operations, realize salvage operations, effectively reduce the difficulty of well-drilling salvage, and improve operation efficiency.

[0027] According to the solution of the utility model, the well-clearing device for connecting back the downhole tubular string of the utility model has a simple structure and is easy to operate, which can effectively improve the efficiency of connecting back the downhole tubular string and clear the well, and effectively reduce the difficulty of clearing the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram showing the structural arrangement of a well-draining device for connecting back a downhole pipe string according to an embodiment of the utility model;

[0029] Figure 2 A schematic diagram showing the structural arrangement of a mandrel according to an embodiment of the present utility model;

[0030] Figure 3 A schematic diagram showing the structural arrangement of a sleeve according to an embodiment of the utility model;

[0031] Figure 4 The structural arrangement diagram of the guide shoe according to one embodiment of the utility model is schematically shown. DETAILED DESCRIPTION

[0032] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only intended to enable those skilled in the art to better understand and implement the present invention, rather than to imply any limitation on the scope of the present invention.

[0033] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0034] Figure 1A schematic diagram showing the structural arrangement of a well-draining device for connecting back a downhole pipe string according to an embodiment of the utility model; Figure 2 A schematic diagram showing the structural arrangement of a mandrel according to an embodiment of the present utility model; Figure 3 A schematic diagram showing the structural arrangement of a sleeve according to an embodiment of the utility model;

[0035] Figure 4 The structural arrangement diagram of the guide shoe according to one embodiment of the utility model is schematically shown. Figure 1-Figure 4 As shown, in this embodiment, the well-draining device for connecting back the downhole pipe string includes:

[0036] The mandrel 1 has a mounting structure 12 arranged around its outer wall;

[0037] The sleeve 2 has one end sleeved on the outer wall of the core shaft 1 and is connected to the mounting structure 12;

[0038] The guide shoe 3 is threadedly connected to the other end of the sleeve 2;

[0039] The outer walls of the sleeve 2 and the guide shoe 3 can be slidably connected to the inner wall of the casing in the oil and gas well;

[0040] A first step hole structure 13 and a second step hole structure 14 are provided in the guide shoe 3, and the first step hole structure is connected to the second step hole structure;

[0041] The downhole tubular column is introduced into the guide shoe 3 through the first step hole structure;

[0042] The bottom end of the mandrel 1 is connected to a well-drilling tool, and the mandrel 1 can reciprocate in the vertical direction inside the sleeve 2 and the guide shoe 3;

[0043] The well-clearing tool at the end of the core shaft 1 is aligned with the downhole tubular column through the second step hole structure, and the well-clearing tool is extended into the downhole tubular column under the drive of the core shaft 1 to clear the well. With such a configuration, the core shaft 1 can be ensured to be on the central axis when driving the well-clearing tool into the casing in the oil and gas well through the sleeve 2 and the guide shoe 3, ensuring that the core shaft 1 drives the well-clearing tool to align with the downhole tubular column in the casing of the oil and gas well, and ensuring that when the core shaft 1 moves downward, the well-clearing tool can smoothly enter the downhole tubular column, thereby performing a well-clearing operation. In addition, the downhole tubular column and the well-clearing tool at the end of the core shaft 1 can be further straightened and limited through the first step hole structure 13 and the second step hole structure 14 in the guide shoe 3, and the axis of the downhole tubular column and the well-clearing tool can be further ensured to correspond on the basis of the above structure, ensuring that the well-clearing tool and / or the downhole tubular column will not produce posture deviation, and ensuring that the well-clearing tool can smoothly enter the downhole tubular column for a well-clearing operation.

[0044] Furthermore, if Figure 1 and Figure 2As shown, in this embodiment, the mounting structure 12 includes a plurality of rectangular protrusions 4 evenly spaced apart along the circumference of the core shaft 1 .

[0045] Furthermore, if Figure 1 and Figure 3 As shown, in this embodiment, a card slot 5 is provided in the sleeve 2, and the card slot 5 is arranged corresponding to the rectangular protrusion 4, and is carded with the top of the rectangular protrusion 4. That is, after the sleeve is sleeved on the outer wall of the core shaft 1 from above the core shaft 1, the top of each card slot 5 is matched and abutted with the top of the rectangular protrusion 4, so that the sleeve 2 is sleeved and supported on the outer wall of the core shaft 1. In this way, if the positions of the sleeve 2 and the guide shoe 3 are fixed, the core shaft 1 can reciprocate at the position below the sleeve, thereby driving the well-clearing tool to clear the downhole pipe string, and realizing a fast and convenient salvage operation.

[0046] Furthermore, if Figure 1 and Figure 4 As shown, in this embodiment, the bottom end face of the guide shoe 3 is an inclined surface 15. In this way, the guide shoe 3 can be formed into a wall hook type guide shoe, one side of which can be formed into a cone that can be close to the inner wall of the casing in the well, so that when the guide shoe moves down, the tapered side can form a traction and guidance effect, improve the ability to guide the top of the downhole pipe string into its core when moving down, ensure that the downhole pipe string can smoothly enter the range of the first step hole structure 13, and improve the construction rate and subsequent well clearance efficiency.

[0047] Furthermore, if Figure 1 and Figure 4 As shown, in this embodiment, the first step hole structure 13 includes a first transition hole 6, a first tapered traction hole 7 and a first positioning and straightening hole 8 which are sequentially connected from bottom to top and whose apertures gradually decrease;

[0048] The inner diameter of the first positioning and straightening hole 8 is equal to the outer diameter of the downhole pipe string;

[0049] The inner wall of the first conical traction hole 7 is provided with alloy teeth for repairing the flatness of the end face of the downhole pipe. With such a configuration, after the top end of the downhole pipe is introduced into the first transition hole 6 through the above-mentioned inclined surface 15, the top end of the downhole pipe will enter the first conical traction hole 7 through the first transition hole 6. At this time, the alloy teeth and other structures on the inner wall of the first conical traction hole 7 will trim the top end of the downhole pipe to ensure that the top end of the downhole pipe is flat. The trimmed top end of the downhole pipe enters the first positioning and straightening hole 8 through the guidance of the first conical traction hole 7, and finally the downhole pipe is limited and positioned through the first positioning and straightening hole 8, thereby ensuring the verticality of the downhole pipe and its position accuracy, so that it is convenient for the well-drilling tool to align with it and enter the downhole pipe to perform well-drilling operations.

[0050] Furthermore, if Figure 1 and Figure 4 As shown, in this embodiment, the second step hole structure 14 includes a second transition hole 9, a second tapered traction hole 10 and a second positioning and straightening hole 11 which are sequentially connected from top to bottom and have gradually decreasing apertures;

[0051] The second positioning and straightening hole 11 is connected to the first positioning and straightening hole 8;

[0052] The aperture of the second positioning and straightening hole 11 is smaller than that of the first positioning and straightening hole 8. With such a configuration, the well-drilling tool at the end of the mandrel 1 can be guided through the second transition hole 9 and the second tapered traction hole 10, and the well-drilling tool can be guided into the second positioning and straightening hole 11, so as to correspond with the end of the downhole tubular in the first positioning and straightening hole 8, realize the centering operation, and ensure that the well-drilling tool is aligned with the axis of the downhole tubular, so that when the well-drilling tool continues to be driven downward by the mandrel 1, the well-drilling tool can smoothly enter the interior of the downhole tubular to perform well-drilling operations, realize salvage operations, effectively reduce the difficulty of well-drilling salvage, and improve operation efficiency.

[0053] According to the above scheme of the utility model, the well-clearing device for connecting back the downhole tubular string of the utility model has a simple structure and is easy to operate, which can effectively improve the efficiency of connecting back the downhole tubular string and clear the well, and effectively reduce the difficulty of clearing the well.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A well-draining device for connecting back downhole pipe strings, characterized in that: include: The mandrel (1) has a mounting structure arranged around its outer wall; A sleeve (2), one end of which is sleeved on the outer wall of the core shaft (1) and connected to the mounting structure; A guide shoe (3) threadedly connected to the other end of the sleeve (2); The outer walls of the sleeve (2) and the guide shoe (3) are slidably connected to the inner wall of the casing in the oil and gas well; A first step hole structure and a second step hole structure are provided in the guide shoe (3), and the first step hole structure is connected to the second step hole structure; Leading the downhole tubular column into the interior of the guide shoe (3) through the first step hole structure; The bottom end of the mandrel (1) is connected to a well-drilling tool, and the mandrel (1) can reciprocate in the vertical direction inside the sleeve (2) and the guide shoe (3); The well-clearing tool at the end of the core shaft (1) is aligned with the downhole tubing through the second step hole structure, and the well-clearing tool is extended into the downhole tubing under the drive of the core shaft (1) to clear the well.

2. The well-draining device for connecting back downhole tubulars according to claim 1, characterized in that: The mounting structure comprises a plurality of rectangular protrusions (4) arranged at even intervals along the circumference of the core shaft (1).

3. The well-draining device for connecting back downhole tubulars according to claim 2, characterized in that: A clamping groove (5) is provided in the sleeve (2), and the clamping groove (5) is clamped with the top end of the rectangular protrusion (4).

4. The well-draining device for connecting back downhole tubulars according to claim 1, characterized in that: The bottom end surface of the guide shoe (3) is an inclined surface.

5. The well-clearing device for connecting back a downhole pipe string according to any one of claims 1 to 4, characterized in that: The first stepped hole structure comprises a first transition hole (6), a first tapered traction hole (7) and a first positioning and straightening hole (8) which are sequentially connected from bottom to top and whose hole diameters gradually decrease; The inner diameter of the first positioning and straightening hole (8) is equal to the outer diameter of the downhole pipe string; The inner wall of the first tapered traction hole (7) is provided with alloy teeth for repairing the flatness of the end surface of the downhole pipe string.

6. The well-draining device for connecting back downhole tubulars according to claim 5, characterized in that: The second stepped hole structure comprises a second transition hole (9), a second tapered traction hole (10) and a second positioning and straightening hole (11) which are sequentially connected from top to bottom and have gradually decreasing hole diameters; The second positioning and straightening hole (11) is in communication with the first positioning and straightening hole (8); The diameter of the second positioning and straightening hole (11) is smaller than the diameter of the first positioning and straightening hole (8).