Combined female tap with variable fishing range and fishing process

Abstract

The combined female tap comprises a first taper body and a second taper body, the first taper body comprises an upper connector and a body, a threaded section is arranged in the upper connector to be connected with a drilling tool, a first shifting opening is formed in the bottom end of the body and used for being sleeved with a fish top, and a second shifting opening is formed in the bottom end of the body. An internal thread section is arranged below the body; the second cone body comprises a first upper connecting part and a cylinder body, the first upper connecting part is provided with a first external thread section, the internal thread section is matched with the first external thread section so that the first cone body and the second cone body can be connected together, and a second shifting opening is formed in the bottom end of the cylinder body. A tool used in the fishing process comprises the combined type female tap with the variable fishing range. According to the combined female tap provided by the invention, the fishing range of the female tap is enlarged, the success rate of one-time fishing is improved, and the probability of production shutdown caused by inconformity of tool sizes is reduced.

Description

Technical Field

[0001] The invention relates to the field of salvaging tool failures in oil drilling engineering, and in particular to a combined female cone with a variable salvaging range and a salvaging process. Background Art

[0002] As exploration and development gradually move towards deep and complex formations, large-sized boreholes are continuously deepened, and various special-shaped speed-up tools are continuously used. At the same time, the probability of failure is greatly increased, which brings certain difficulties to the preparation of salvage tools and salvage operations. When a tool failure occurs during the drilling operation, it is necessary to salvage downhole tools, especially in large boreholes, large annular gaps, and fish top deformation. Conventional integral mother cones are used to salvage fish in large boreholes. The outer diameter of the mother cone is 15 to 30 mm larger than the maximum opening. The salvage range is usually within 30 to 40 mm below the maximum opening, and the bottom of the conventional mother cone is a smooth plane structure. During use, the following problems exist: (1) The salvage size range is insufficient; (2) The range of variation of the fish top diameter is small, and the potential minimum size is too large when the maximum salvage size is met, or the maximum salvage size is too small when the minimum size is met; (3) When a smaller fish needs to be salvaged, the outer diameter of the mother cone is also small, which is very easy to miss the fish top; (4) The bottom plane design is not easy to fit the fish.

[0003] It is necessary to overcome the shortcomings of the existing mother cone, actively deal with large wellbores, large annuli, insufficient tool salvage size range, reduce and improve tool preparation, processing time, cooling time, etc., to minimize unnecessary economic losses.

[0004] A Chinese patent with application number "CN201821171665.9" and name "Composite Salvage Female Cone" discloses a composite salvage female cone, which includes a male cone and a female cone. The lower end of the male cone is inserted into the interior of the female cone, and the male cone and the female cone are threadedly fixed to each other. The male cone includes a male cone salvage head, a limit head, a conical nut and a salvage cone rod. By utilizing the mutual fixation between the male cone and the female cone, it is convenient to simultaneously realize the hanging thread fixation of the outer and inner holes of the fish top during the salvage operation to achieve salvage. This method can avoid the time wasted when replacing the male cone or the female cone. Combining the two salvage methods together for common use can effectively improve work efficiency. In addition, by utilizing the salvage cone rod extending from the bottom of the salvage tube, it is convenient to drop the salvage cone rod to the fish top before the salvage operation to straighten the fish top, which can improve the salvage efficiency. However, the present application is different from its structure. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to solve one or more problems in the prior art. For example, one of the purposes of the present invention is to provide a combined female cone with a variable salvage range and a salvage process.

[0006] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a combined female cone with a variable salvage range, wherein the combined female cone may include a first cone and a second cone, wherein the first cone includes an upper joint and a main body, a threaded section is provided in the upper joint to connect the drilling tool, a first dial mouth is provided at the bottom end of the main body to be inserted into the fish top, and an internal thread section is provided below the main body; the second cone includes a first upper connecting part and a cylinder, the first upper connecting part is provided with a first external thread section, the internal thread section is adapted to the first external thread section so that the first cone and the second cone can be connected together, and a second dial mouth is provided at the bottom end of the cylinder.

[0007] According to one or more exemplary embodiments of an aspect of the present invention, the combined female cone may further include a guide shoe, which includes a second upper connecting portion, a guide body and a guide shoe body, and the second upper connecting portion is provided with a second external thread section to achieve interconnection with the first cone.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the guide body may be located at the bottom of the guide shoe body, capable of guiding the fallen fish into the interior of the salvage tool, and a third shifting opening may be provided at the bottom end of the guide shoe body, and the third shifting opening may include an arc shifting opening.

[0009] According to one or more exemplary embodiments of an aspect of the present invention, the first and second openings may include arc openings.

[0010] According to one or more exemplary embodiments of an aspect of the present invention, the threads in the internal thread segment, the first external thread segment, and the second external thread segment may all include rectangular threads.

[0011] According to one or more exemplary embodiments of an aspect of the present invention, the first cone may further include a first water eye, a first salvage thread and a marking groove, the first water eye and the marking groove are symmetrically arranged relative to the central axis of the first cone, and are both located below the upper joint, the first salvage thread is located outside the first water eye, and the marking groove is located between the upper joint and the body; the second cone also includes a second salvage thread and a first guide slope, the second salvage thread is located inside the cylinder and outside below the first water eye, and the first guide slope is located at the bottom of the second cone.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the guide shoe may also include a second water eye and a second guide slope, the second water eye is located at the second upper connecting part and is arranged in parallel with the second external thread segment, and the second guide slope is an arc surface from the outside to the inside of the lower part of the guide shoe body, which can enable the fallen fish to smoothly enter the interior of the guide shoe body.

[0013] According to one or more exemplary embodiments of an aspect of the present invention, the combination of the combined female cone may include one or more of a first vertebral body, a first cone and a second cone, and a first cone and a guide shoe.

[0014] Another aspect of the present invention provides a salvage process with a variable salvage range. The tool used in the salvage process may include the combined female cone with a variable salvage range as described above.

[0015] According to one or more exemplary embodiments of another aspect of the present invention, the tools used in the fishing process may further include a drill collar, a drill pipe, and a weighted drill pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The combined female cone with a variable salvage range provided by the present invention has a dial opening added to the bottom of the female cone, which solves the technical difficulty that the conventional female cone is difficult to fit into the fish head;

[0018] (2) The combined female cone with a variable salvage range provided by the present invention has a rectangular female thread added to the bottom of the female cone to achieve interconnection of equal-sized buckles;

[0019] (3) The combined mother cone with a variable salvage range provided by the present invention adopts a rectangular external thread design on the upper part of the pull-mouth guide shoe and the second cone, thereby realizing the interconnection between the first cone and the pull-mouth guide shoe and the second cone, thereby maximizing the net salvage area of ​​the mother cone or the salvage range of the buckle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic cross-sectional structure diagram of a combined female cone showing a combination of a first cone and a second cone in an exemplary embodiment of the present invention;

[0022] Figure 2 A schematic cross-sectional structure diagram of a pull-out shoe guide in an exemplary embodiment of the present invention is shown.

[0023] Description of reference numerals:

[0024] 11-upper joint, 111-threaded section, 12-body, 121-first shifting port, 122-internal threaded section, 123-first salvage thread, 13-marking groove, 14-first water eye;

[0025] 211-first external thread section, 22-cylinder body, 221-second shifting opening, 222-second fishing thread, 223-first guiding inclined surface;

[0026] 31-second upper connecting portion, 311-second external thread section, 312-second water eye, 32-guide body, 33-guide shoe body, 34-third shifting port, 36-arc concave surface, 35-second guide inclined surface, 36-arc concave surface. DETAILED DESCRIPTION

[0027] Hereinafter, a combined female cone with a variable salvaging range and a salvaging process of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Exemplary Embodiment 1

[0032] Figure 1 A schematic cross-sectional structure diagram of a combined female cone showing a combination of a first cone and a second cone in an exemplary embodiment of the present invention; Figure 2 A schematic cross-sectional structure diagram of a pull-out shoe guide in an exemplary embodiment of the present invention is shown.

[0033] like Figure 1 to Figure 2 As shown in , this exemplary embodiment provides a combined female cone with a variable salvaging range, and the combined female cone mainly includes a first cone and a second cone.

[0034] The first cone includes an upper joint 11 and a body 12, wherein a threaded section 111 is provided in the upper joint 11 for connecting the drilling tool, a first shifting opening 121 is provided at the bottom end of the body 12 for inserting the fish top, and an internal threaded section 122 is provided below the body 12. The second cone includes a first upper connecting portion and a barrel 22, wherein a first external threaded section 211 is provided at the first upper connecting portion, the internal threaded section 111 is adapted to the first external threaded section 211 so that the first cone and the second cone can be connected together, and a second shifting opening 221 is provided at the bottom end of the barrel 22. Here, the shifting opening refers to a protruding portion with a height difference in the axial direction along the central axis on the radial plane at the bottom of the tool.

[0035] In this exemplary embodiment, the combined female cone may further include a guide shoe, which may include a second upper connection portion 31, a guide body 32 and a guide shoe body 33. The second upper connection portion 31 is provided with a second external thread section 311 to achieve interconnection with the first cone. The guide body 32 is located at the bottom of the guide shoe body 33, and can guide the fallen fish into the interior of the salvage tool. The bottom end of the guide shoe body 33 is provided with a third pull-out port 34. Here, the entire metal part of the guide shoe may be the guide shoe body, and the guide shoe body can guide and accommodate and allow the fallen fish to pass through the center of the guide shoe body and enter the interior of the salvage tool. The guide shoe may also include a second water eye 312 and a second guide slope 35. The second water eye 312 is located at the second upper connection portion 31 and is arranged in parallel with the second external thread section 311. The second guide slope 35 may be an arc surface from the outside to the inside of the bottom of the guide shoe body 33, which can allow the fallen fish to smoothly enter the interior of the guide shoe body. A circular arc concave surface 36 is also provided below the second external thread section 311, and is located outside the second external thread section 311, and can cooperate with the first shifting port 121 to complete the connection thread and transmit torque. Here, the guide shoe may include an enlarged guide shoe, the second water eye may include a second enlarged water eye, the second water eye may be a space for a non-metallic part of the guide shoe, and the second water eye may be a space reserved for realizing the circulation of working fluid and for the fish to enter the interior of the female cone to complete the new threading.

[0036] Furthermore, the shift opening may include an arc shift opening.

[0037] In this exemplary embodiment, the threads in the internal thread segment 122, the first external thread segment 211, and the second external thread segment 311 may all include rectangular threads. The rectangular threads are used between the first cone and the second cone to achieve quick connection and withstand high torque transmission.

[0038] In this exemplary embodiment, the first cone may also include a first water hole 14, a first salvage thread 123 and a marking groove 13. The first water hole 14 and the marking groove 13 are symmetrically arranged relative to the central axis of the first cone and are both located below the upper joint 11. The first salvage thread 123 is located outside the first water hole 14, and the marking groove 13 is located between the upper joint 11 and the body 12. The second cone may also include a second salvage thread 222 and a first guiding slope 223. The second salvage thread 222 is located inside the cylinder 22 and outside below the first water hole 14. The first guiding slope 223 is located at the bottom of the second cone. Here, the role of the salvage thread is to realize the new threading of the outer body of the fish falling downhole. It is the core component to realize the effective connection between the salvage pipe string and the fish falling downhole. The water hole is a space reserved for realizing the circulation of the working fluid and for the fish falling into the mother cone to complete the new threading.

[0039] In this exemplary embodiment, the combination of the combined female cone may include one or more of a first vertebral body, a first cone and a second cone, and a first cone and a guide shoe.

[0040] Exemplary Embodiment 2

[0041] This exemplary embodiment provides a salvage process with a variable salvage range. The tools used in the salvage process may include a combined female cone with a variable salvage range as described in Exemplary Embodiment 1.

[0042] In this exemplary embodiment, the tools used in the fishing process may also include drill collars, drill pipes, and weighted drill pipes. Here, the mother cones are combined according to the wellbore size and the fish size, and there are three ways to combine them:

[0043] (1) If the fish drop size plus the outer diameter of the first cone (conventional female cone) is larger than the wellbore size, and the outer diameter of the fish drop can match the first cone, the following combination can be used: first female cone, back pressure valve, 2-3 drill collars, drill pipe and weighted drill pipe;

[0044] (2) If the fish drop size plus the outer diameter of the first cone is smaller than the wellbore size, and the outer diameter of the fish drop can match the first cone, then the following combination can be used: enlarged guide shoe, first mother cone, back pressure valve, 2-3 columns of drill collars, drill pipe and weighted drill pipe;

[0045] (3) If the size of the fish plus the outer diameter of the first cone is smaller than the wellbore size, and the outer diameter of the fish is larger than the salvage size of the first cone, then the following combination is used: the second cone (enlarged cone), the first cone, a back pressure valve, 2 to 3 columns of drill collars, a drill pipe, and a weighted drill pipe.

[0046] In order to better understand the above exemplary embodiment 2, it will be further described below with reference to specific examples.

[0047] Example 1

[0048] (1) Measure the combined cone to be put into the well and draw a sketch of the well entry tool. Connect the required cone combination with the salvage drill bit. Tighten each thread according to the specified torque. Select the back pressure valve according to the needs of the well. If explosive loosening is not required, install it according to the regulations. If explosive loosening is required, do not install it.

[0049] (2) Lower the combined mother cone at a low speed to allow it to pass through the wellhead assembly. Do not press hard if it encounters any resistance. Lift the drill bit and adjust its position to allow it to pass.

[0050] (3) Control the speed of drilling to a distance of 0.5 to 1.0 m from the theoretical fish top, calibrate the depth of the first cone, start the pump to adjust the drilling fluid displacement, and record parameters such as pump stroke and pump pressure.

[0051] (4) Control the drilling pressure at 10 to 20 kN and slowly probe the fish top. When the pump pressure rises, record the actual fish top depth. If there is resistance display but the pump pressure does not change, rotate the first cone 1 / 4 to 1 / 2 circle to continue to probe downward or lift the drill bit to adjust the direction of the downward exploration.

[0052] (5) Lift the drill bit away from the fish top 0.5∽1.0m above the fish top, flush the fish top with a large displacement or circulate to eliminate the oil and gas aftereffects. During the circulation process, pay attention to preventing the active drill bit from getting stuck. Here, circulation to eliminate the oil and gas aftereffects refers to the process of using power equipment to pump the working fluid into the well through the internal channel of the wellbore string, and bring the oil or gas accumulated in the oil and gas display layer section in the well to the ground through the outer annulus of the wellbore string for separation and treatment.

[0053] (6) After the cycle is completed, the pump pressure before salvage, the pulling force value of the up and down movement, and the rotation parameters are tested at different displacements.

[0054] (7) Making a buckle: First, use low pressure and low torque to draw the buckle. When the pump pressure rises, stop the pump. The drilling pressure and torque are gradually increased from low to high, but not exceeding 80% of the torsional strength of the tool and salvage drill.

[0055] (8) Control the pulling force to lift the drill bit 3 to 5 m away from the bottom of the well, quickly lower the drill bit, brake it 2 to 3 times, and start drilling at a controlled speed without changing the suspended weight.

[0056] (9) If the downhole blockage cannot be removed by moving the drill bit up and down or rotating the drill bit, the next operation shall be carried out according to the relevant measures. Here, the relevant measures are the operating measures or requirements specified in the unit's rules and regulations when the blockage cannot be removed.

[0057] (10) The first cone is lifted to the wellhead and the fish landing seat is locked. The damaged tools are dumped out, the first cone is removed for cleaning and inspection, and the salvage operation is completed and normal production is resumed.

[0058] In summary, the advantages proposed by the present invention include at least one of the following:

[0059] (1) The combined mother cone with a variable salvaging range provided by the present invention combines a conventional mother cone with an enlarged guide shoe to reduce the annular gap between the fallen fish and the mother cone, increase the net catching area of ​​the mother cone, and minimize the possibility of missing the top of the fish.

[0060] (2) The combined mother cone with a variable salvage range provided by the present invention combines a conventional mother cone with an enlarged cone, thereby increasing the salvage range of the mother cone, improving the success rate of one-time salvage, and reducing the probability of production shutdown caused by tool size incompatibility.

[0061] Although the combined mother cone with a variable salvaging range and the salvaging process of the present invention have been described above in combination with exemplary embodiments, those skilled in the art should be aware that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A combined female cone with a variable salvage range. It is characterized in that The combined female cone comprises a first cone and a second cone, wherein: The first cone includes an upper joint and a body, wherein a threaded section is arranged in the upper joint for connecting a drilling tool, a first opening is arranged at the bottom end of the body for inserting a fish head, and an internal threaded section is arranged below the body; The second cone includes a first upper connecting portion and a barrel. The first upper connecting portion is provided with a first external thread segment. The internal thread segment is adapted to the first external thread segment so that the first cone and the second cone can be connected together. The bottom end of the barrel is provided with a second shifting opening.

2. The combined female cone with variable salvage range according to claim 1, It is characterized in that The combined female cone also includes a guide shoe, which includes a second upper connecting portion, a guide body and a guide shoe body. The second upper connecting portion is provided with a second external thread section to achieve interconnection with the first cone.

3. The combined female cone with variable salvage range according to claim 2, It is characterized in that The guide body is located at the bottom of the guide shoe body, and can guide the fallen fish into the interior of the salvage tool. The bottom end of the guide shoe body is provided with a third shifting opening, and the third shifting opening includes an arc shifting opening.

4. The combined female cone with variable salvage range according to claim 1, It is characterized in that The first shift opening and the second shift opening include arc shift openings.

5. The combined female cone with variable salvage range according to claim 1, It is characterized in that The threads in the internal thread segment, the first external thread segment and the second external thread segment all include rectangular threads.

6. The combined female cone with variable salvage range according to claim 1, It is characterized in that The first cone also includes a first water eye, a first salvage thread and a marking groove, the first water eye and the marking groove are symmetrically arranged relative to the central axis of the first cone, and are both located below the upper joint, the first salvage thread is located outside the first water eye, and the marking groove is located between the upper joint and the body; the second cone also includes a second salvage thread and a first guide slope, the second salvage thread is located inside the cylinder and outside below the first water eye, and the first guide slope is located at the bottom end of the second cone.

7. The combined female cone with variable salvage range according to claim 2, It is characterized in that The guide shoe also includes a second water eye and a second guide slope. The second water eye is located at the second upper connecting portion and is arranged in parallel with the second external thread segment. The second guide slope is an arc surface from the outside to the inside of the lower part of the guide shoe body, which can enable the fallen fish to smoothly enter the interior of the guide shoe body.

8. The combined female cone with variable salvage range according to claim 2, It is characterized in that The combination of the combined female cone includes one or more of the first vertebral body, the first cone and the second cone, and the first cone and the guide shoe.

9. A salvage process with a variable salvage range. It is characterized in that The tool used in the salvage process includes the combined female cone with a variable salvage range as described in any one of claims 1 to 8.

10. The salvage process with a variable salvage range according to claim 9, It is characterized in that The tools used in the salvage process also include drill collars, drill pipes and weighted drill pipes.

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