High-efficiency large-diameter casing pipe special screwed joint for oil gas drilling

Abstract

The utility model discloses a high-efficiency large-diameter casing pipe special screwed joint for oil and gas drilling. The high-efficiency large-diameter casing pipe special screwed joint comprises a coupling, a pipe and a reaction torque release joint which are connected in sequence, first internal threads and inner shoulders are symmetrically arranged on the inner circumferential surfaces of the two ends of the coupling; first external threads and external circular beads are symmetrically arranged on the outer circumferential surfaces of the two ends of the pipe; according to the large-diameter casing pipe, the design of large pitch and large taper is adopted, the screwing-on speed is high, efficiency is greatly improved, and the special well condition requirements of short casing pipe time limit and the like under the complex conditions of a deep well, an ultra-deep well and an underground well are met; by adopting the design of the bearing type reaction torque release device, the reverse rotation tripping risk caused by sudden release of the reaction torque can be avoided, and the construction safety and reliability are greatly improved; meanwhile, the male buckle is directly machined on the sleeve body instead of a conventional large-caliber welding mode, and safety and quality risks possibly caused by welding are eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas drilling and production pipe thread connection technical field, concretely relates to a kind of oil and gas drilling and production high-efficiency large-diameter casing special thread joint. BACKGROUND

[0002] In the development process of petroleum industry, the casing string structure design originally 3-4 layer casing is the API standard thread joint commonly used in oil special pipe, and the maximum diameter of its surface casing is 20 inches (508mm), which is large enough, but with the development of oil and gas drilling and production operation to larger well depth, higher pressure and temperature, more severe working conditions and the progress of oil drilling and production technology itself, with the increasing depth, the number of casing will increase, and the surface large-diameter casing 20 inches obviously cannot fully meet the requirements.

[0003] Although the API round thread pitch is 8 teeth per inch, the make-up efficiency is low, and the connection strength of the thread part is only 60%-80% of the pipe body part, and although the API partial rectangular thread has higher connection strength of thread part and the pitch is 5 teeth per inch, the make-up efficiency is improved, but for deep well, ultra-deep well and complex downhole conditions, it needs to make up faster and more efficient large-diameter casing. At the same time, in the actual operation of casing, the reverse torque is released due to blocking, which leads to the risk of casing, especially large-diameter casing, being released. In addition, the male thread of the previous large-diameter casing is in the form of welded joint, but welding may cause great safety and quality risks.

[0004] Therefore, it is necessary to improve the existing joint structure to meet the use requirements of the industry for faster and more efficient large-diameter casing special thread joint. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of oil and gas drilling and production high-efficiency large-diameter casing special thread joint to meet the use requirements of the industry for faster and more efficient large-diameter casing special thread joint.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows:

[0007] A kind of oil and gas drilling and production high-efficiency large-diameter casing special thread joint, including in turn connected coupling, pipe and reverse torque release joint;

[0008] The two ends of the coupling are symmetrically provided with first internal thread and internal shoulder on the inner circumferential surface;The two ends of the pipe are symmetrically provided with first external thread and external shoulder on the outer circumferential surface;

[0009] The outer thread and the inner thread are both conical threads, the taper is 0.100-0.133 mm / mm, the pitch is 8.467 mm, and the tooth height h is 2.15-2.20 mm;

[0010] The left end of the anti-torque release joint is provided with an inner thread joint, the right end is provided with an outer thread joint, and an anti-torque release device is arranged between the inner thread joint and the outer thread joint; the anti-torque release device comprises an O-shaped sealing ring, an inner snap spring, a cylindrical roller bearing and an outer snap spring;

[0011] The inner thread joint comprises, from left to right, a second inner thread, an inner O-shaped groove, an inner sealing surface, an inner positioning shoulder and an outer snap spring groove;

[0012] The outer thread joint comprises, from right to left, a second outer thread, an outer positioning shoulder, an inner snap spring groove, an outer O-shaped groove and an outer sealing surface;

[0013] The second inner thread is consistent with the structure of the first inner thread; and the second outer thread is consistent with the structure of the first outer thread;

[0014] The O-shaped sealing ring is arranged between the inner O-shaped groove and the outer O-shaped groove, the inner snap spring is arranged in the inner snap spring groove, the outer snap spring is arranged in the outer snap spring groove, and the cylindrical roller bearing is arranged between the inner positioning shoulder and the outer positioning shoulder, and the outer ring of the cylindrical roller bearing is connected with the outer thread joint, and the inner ring is connected with the inner thread joint.

[0015] The guide angle of the second inner thread, the first inner thread, the second outer thread and the first outer thread is 30°, and the bearing face angle is 90±3°.

[0016] The specification outer diameter of the pipe is 339.7-711.2 mm, and the outer diameter of the anti-torque release joint is greater than the specification outer diameter.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] (1) The large-diameter casing of the utility model adopts a large-pitch large-taper design, the make-up speed is fast, the efficiency is greatly improved, and the special well condition requirements such as time limit for casing in deep wells, ultra-deep wells and complex downhole conditions are ensured; at the same time, the bearing type anti-torque release device design of the utility model can avoid the risk of reverse tripping caused by sudden release of anti-torque, and greatly improve the construction safety reliability.

[0019] (2) The utility model adopts a special thread design of large pitch, 90° bearing face and 30° guide face, which is convenient for processing and greatly improves the anti-sticking ability.

[0020] (3) The utility model discloses a male buckle is directly processed on the sleeve body, and does not use the conventional large-diameter welding mode, so that the safety and quality risks caused by welding are eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 shows the overall structure of the joint provided by the utility model embodiment;

[0022] Figure 2 Fig. 2 shows the internal and external thread engagement assembly provided by the utility model embodiment;

[0023] Figure 3 Fig. 3 shows the coupling structure provided by the utility model embodiment;

[0024] Figure 4 Fig. 4 shows the pipe cross-section provided by the utility model embodiment;

[0025] Figure 5 Fig. 5 shows the thread cross-section provided by the utility model embodiment;

[0026] Figure 6 Fig. 6 shows the anti-torque release joint structure provided by the utility model embodiment;

[0027] Figure 7 Fig. 7 shows the internal thread joint structure provided by the utility model embodiment;

[0028] Figure 8 Fig. 8 shows the external thread joint structure provided by the utility model embodiment;

[0029] Figure 9 Fig. 9 shows the anti-torque release device provided by the utility model embodiment;

[0030] In the figure: 1-coupling, 2-pipe, 3-anti-torque release joint, 11-first internal thread, 12-internal shoulder, 13-second internal thread; 21-first external thread, 22-external shoulder, 23-second external thread; 31-internal thread joint, 32-anti-torque release device, 33-external thread joint, 311-internal O-shaped groove, 312-internal sealing surface, 313-internal positioning shoulder, 314-external snap spring groove, 331-external sealing surface, 332-external O-shaped groove, 333-internal snap spring groove, 334-external positioning shoulder, D-specification outer diameter, D1-coupling outer diameter, D2-anti-torque release joint outer diameter, h-tooth height, P-pitch, B-guiding angle, A-bearing surface angle. DETAILED DESCRIPTION

[0031] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of the utility model protection.

[0032] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0033] In the description of the patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or can be detachably connected, set, or integrally connected, set, which can mean direct connection or indirect connection. For the ordinary skilled in the art, the specific meaning of the above terms in the patent can be understood according to the specific circumstances.

[0034] Please refer to Figures 1-9 The embodiment structure provided by the utility model is shown.

[0035] Embodiment 1

[0036] The embodiment provides a high-efficiency large-diameter casing special thread joint for oil and gas drilling, which comprises a coupling 1, a pipe 2 and a reverse torque release joint 3 connected in sequence.

[0037] The inner circumferential surface of the two ends of the coupling 1 is symmetrically provided with a first inner thread 11 and an inner shoulder 12;

[0038] The outer circumferential surface of the two ends of the pipe 2 is symmetrically provided with a first outer thread 21 and an outer shoulder 22;

[0039] The outer thread 21 and the inner thread 11 are both conical threads, the taper is 0.100-0.133 mm / mm, the pitch is 8.467 mm, and the tooth height h is 2.15-2.20 mm;

[0040] The left end of the anti-torque release connector 3 is provided with an internal thread connector 31, and the right end is provided with an external thread connector 33. An anti-torque release device 32 is provided between the internal thread connector and the external thread connector. The anti-torque release device 32 includes an O-ring seal 321, an internal snap ring 322, a cylindrical roller bearing 323, and an external snap ring 324.

[0041] The internal threaded connector 31 includes, from left to right, a second internal thread 13, an internal O-ring groove 311, an internal sealing surface 312, an internal positioning shoulder 313, and an external snap ring groove 314.

[0042] The external threaded connector 33 includes, from right to left, a second external thread 23, an external positioning shoulder 334, an internal snap ring groove 333, an external O-ring groove 332, and an external sealing surface 331;

[0043] The second internal thread 13 has the same structure as the first internal thread 11; the second external thread 23 has the same structure as the first external thread 11.

[0044] The O-ring seal 321 is disposed between the inner O-ring groove 311 and the outer O-ring groove 332. The inner retaining spring 322 is disposed in the inner retaining spring groove 333. The outer retaining spring 324 is disposed in the outer retaining spring groove 314. The cylindrical roller bearing 323 is disposed between the inner positioning shoulder 313 and the outer positioning shoulder 334, and its outer ring is connected to the external threaded joint 33, and its inner ring is connected to the internal threaded joint 31.

[0045] It should be noted that the large-diameter casing of this utility model adopts a design with a large pitch and a large taper, which results in a fast winding speed and greatly improves efficiency, ensuring that the casing can meet the special well conditions such as urgent time limits in deep wells, ultra-deep wells, and complex downhole situations. At the same time, this utility model adopts a bearing-type anti-torque release device design, which can avoid the risk of reverse disengagement caused by sudden release of anti-torque, and greatly improve the safety and reliability of construction.

[0046] Example 2

[0047] This embodiment is a further improvement based on embodiment 1. The guide angle B of the second internal thread 12 and the first internal thread 11, the second external thread 21, and the first external thread 11 is 30°, and the bearing surface angle A is 90±3°.

[0048] It should be noted that this utility model adopts a special thread design with a large pitch, a 90° bearing surface, and a 30° guiding surface, which facilitates processing and greatly improves the anti-sticking ability.

[0049] In addition, the outer diameter of the pipe 2 is D = 339.7~711.2mm, and the outer diameter of the anti-torque release joint D2 = the outer diameter of the coupling D1 > the outer diameter of the specification D.

[0050] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high efficiency large diameter casing premium for oil and gas drilling characterized by: The coupling (1), the pipe (2) and the anti-torque release joint (3) are sequentially connected. The first internal thread (11) and the internal shoulder (12) are symmetrically arranged on the inner circumferential surface of the two ends of the coupling (1). The first external thread (21) and the external shoulder (22) are symmetrically arranged on the outer circumferential surface of the two ends of the pipe (2). The external thread (21) and the internal thread (11) are both conical threads, the taper is 0.100-0.133 mm / mm, the pitch is 8.467 mm, and the tooth height h is 2.15-2.20 mm. The anti-torque release device (32) is arranged between the internal thread joint and the external thread joint. The internal thread joint (31) comprises the second internal thread (13), the internal O-shaped groove (311), the internal sealing surface (312), the internal positioning shoulder (313) and the external snap spring groove (314) which are sequentially arranged from left to right. The external thread joint (33) comprises the second external thread (23), the external positioning shoulder (334), the internal snap spring groove (333), the external O-shaped groove (332) and the external sealing surface (331) which are sequentially arranged from right to left. The second internal thread (13) is consistent with the first internal thread (11) in structure, and the second external thread (23) is consistent with the first external thread (21) in structure. The O-shaped sealing ring (321) is arranged between the internal O-shaped groove (311) and the external O-shaped groove (332), the internal snap spring (322) is arranged in the internal snap spring groove (333), the external snap spring (324) is arranged in the external snap spring groove (314), and the cylindrical roller bearing (323) is arranged between the internal positioning shoulder (313) and the external positioning shoulder (334) and connected with the external thread joint (33) through the outer ring and connected with the internal thread joint (31) through the inner ring. The guide angle (B) of the second internal thread (13), the first internal thread (11), the second external thread (23) and the first external thread (21) is 30°, and the bearing surface angle (A) is 90±3°.

2. A high efficiency large diameter casing special thread joint for oil and gas drilling as claimed in claim 1, wherein: The specification outer diameter (D) of the pipe (2) is 339.7-711.2 mm, the anti-torque release joint outer diameter (D2) is greater than the coupling outer diameter (D1) and the specification outer diameter (D).

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