Double-shoulder high-torsion-resistance drilling and production screwed joint

Abstract

The utility model discloses a double-shoulder high-torsion-resistance drilling and production threaded connector which comprises a connector body, a drill rod male connector arranged at the left end of the connector body, a drill rod female connector arranged at the right end of the connector body and a plurality of wear-resisting devices installed on the connector body. The wear-resistant devices are embedded in the middle of the left thickening portion of the outer circumferential surface of the connector body and evenly distributed at equal intervals, each wear-resistant device comprises a supporting block, a wear-resistant belt and a screw, the supporting block is connected with the connector body through the screw, and the wear-resistant belt is welded and fixed to the outer surface of the supporting block. By adopting the design of a metal-to-metal double-shoulder anti-torsion structure, the anti-torsion strength and the air sealing effect are greatly improved, and the connection strength and the air sealing effect under the complex well conditions of a deep well, an ultra-deep well, a high-pressure well and the like are ensured; in addition, by adopting the design of a replaceable wear-resistant device, the damage rate of the whole joint is reduced, the service life is prolonged, and the cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling and production pipe thread connection, in particular to a double-shoulder high-torsion resistance drilling and production threaded joint. Background Art

[0002] Shallow terrestrial oil resources are now largely depleted. Coastal countries have turned to offshore drilling, while landlocked nations are seeking deeper oil resources by increasing their drilling capabilities. Advances in oil exploration technology and drilling equipment have led to higher requirements for drill pipe joint performance in deep, ultra-deep, and enhanced drilling.

[0003] Drill pipe is an important tool for extracting oil and natural gas. During the drilling process, it is the hub connecting the ground and underground. The drill pipes are connected by joints, which are machined with internal and external threads to connect individual drill pipes. During the drilling process, the drill pipe joints are subjected to complex forces and work in a very harsh environment. They are often the weak link in drilling equipment and tools. Disconnection, puncture, and twisting of API drill pipe are common drilling accidents. Conventional API standard drill pipe joints have a single shoulder. The shoulder is located at one end of the joint connection thread. When the joint is tightened, the shoulder surface has the function of bearing the torque of the drill pipe. In actual production, it is found that the torsional strength and sealing performance of the standard drill pipe joints with a single shoulder cannot meet the requirements of complex geological environments.

[0004] In addition, existing conventional drilling joints are frequently reused, resulting in severe damage to the outer circumferential surface, which often causes the entire joint to be scrapped, resulting in losses. Utility Model Content

[0005] In view of the technical problems pointed out in the above background technology that in actual production, it is found that the torsional strength and sealing performance of the standard drill pipe joint with a single shoulder cannot meet the requirements of complex geological environments, and the existing conventional drilling and production joints are reused frequently, the outer circumferential surface is severely damaged, and the entire joint is often scrapped due to this, causing losses, the purpose of this utility model is to provide a double-shouldered high-torsion-resistant drilling and production threaded joint.

[0006] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0007] A double-shouldered high-torsion-resistant drilling threaded joint, comprising a joint body, a drill pipe male joint provided at the left end of the joint body, a drill pipe female joint provided at the right end of the joint body, and a plurality of wear-resistant devices installed on the joint body;

[0008] The outer circumferential surface of the drill pipe male joint at the left end is provided with an external anti-torsion secondary shoulder, an external thread, a stress relief groove and an external anti-torsion main shoulder in sequence from left to right;

[0009] The inner circumferential surface of the drill pipe female joint at the right end is provided with an inner torsion-resistant secondary shoulder, an internal thread and an inner torsion-resistant primary shoulder in sequence from left to right;

[0010] When the drill pipe male joint is rotated and engaged with the drill pipe female joint used in conjunction with it, the external thread is screwed into the internal thread and gradually tightened so that the external anti-torsion main shoulder gradually contacts the internal anti-torsion main shoulder used in conjunction with it until an interference fit is formed, and the distance between the external anti-torsion secondary shoulder and the internal anti-torsion secondary shoulder used in conjunction with it gradually decreases until a transition fit is formed;

[0011] Each of the wear-resistant devices is embedded in the middle of the left thickened part of the outer circumferential surface of the joint body and is evenly distributed at equal intervals. It includes a support block, a wear-resistant belt and a screw. The support block is connected to the joint body through the screw, and the wear-resistant belt is welded and fixed to the outer surface of the support block.

[0012] Among them, there are 3 groups of wear-resistant devices.

[0013] The external thread is arranged on the outer side of the end of the drill pipe male joint, with a pitch of 6.35 mm and a taper of 1:6.

[0014] The internal thread is arranged on the inner side of the end of the drill pipe female joint, with a pitch of 6.35 mm and a taper of 1:6.

[0015] Among them, the outer diameter of the small end cylinder of the drill pipe male joint is 119±0.5mm, the outer diameter of the large end cylinder is 145±0.5mm, the inner diameter is 101.6±0.5mm, the shoulder distance of the drill pipe female joint is - the shoulder distance of the drill pipe male joint

[0016] =+0~+0.15mm.

[0017] Wherein, the wear-resistant device is replaceable, and the distance between the screw and the inner diameter - the wall thickness of the joint body ≥ 0.

[0018] Wherein, a plurality of tightening slots for rotating the drilling threaded joint are provided in the middle of the right thickened portion of the outer circumferential surface of the joint body.

[0019] Wherein, the number of the tightening slots is 5.

[0020] Among them, the inner diameter of the tightening slot = 8mm, and the distance between the tightening slot and the inner diameter - the wall thickness of the connector body ≥ 0.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The utility model adopts a metal-to-metal double-shoulder torsion-resistant structure design, which greatly improves the torsional strength and airtightness, ensuring the connection strength and airtightness in complex well conditions such as deep wells, ultra-deep wells, and high-pressure wells. In addition, the utility model adopts a replaceable wear-resistant device design to reduce the overall joint damage rate, increase service life and greatly reduce costs.

[0023] In addition, the design of the tightening slot of the utility model adds a manual screwing method. By inserting the plug-in into the slot, pushing the plug-in to drive the connector to rotate, it can replace the screw-on machine that requires a large operating space, avoiding injuries caused by machines in narrow spaces, and greatly improving safety and operability.

[0024] In addition, the present invention adopts the design of stress relief groove, which optimizes the structural design, improves the product's stress corrosion resistance, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 The figure shows a cross-sectional view of the drill pipe male joint of the present invention;

[0027] Figure 3 The figure shows a cross-sectional view of the drill pipe female joint of the present invention;

[0028] Figure 4 Shown is a schematic diagram of tightening the male and female joints of the drill pipe in this application;

[0029] Figure 5 The figure shows an axial cross-sectional view of the wear-resistant device of the present invention;

[0030] Figure 6 Shown is an enlarged schematic diagram of the wear-resistant device of the utility model;

[0031] In the figure: drill pipe male joint 1, wear-resistant device 2, drill pipe female joint 4, external anti-torsion auxiliary shoulder 11, external thread 12, stress relief groove 13, external anti-torsion main shoulder 14, internal anti-torsion auxiliary shoulder 41, internal thread 42, internal anti-torsion main shoulder 43, support block 21, wear-resistant belt 22, screw 23, small end cylinder outer diameter D1, large end cylinder outer diameter D2, inner diameter d, drill pipe male joint shoulder distance L1, drill pipe female joint shoulder distance L2, distance between screw and inner diameter t1, joint body wall thickness T, tightening slot 3, tightening slot inner diameter D3, and distance between tightening slot and inner diameter t2. DETAILED DESCRIPTION

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

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0034] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood broadly. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set, and can refer to direct connection or indirect connection. Those skilled in the art can understand the specific meanings of the above terms in this patent based on specific circumstances.

[0035] See also Figures 1-6 Shown is the embodiment structure provided by the utility model.

[0036] Example 1

[0037] This embodiment provides a double-shouldered high-torsion-resistant drilling threaded joint, comprising a joint body, a drill pipe male joint 1 provided at the left end of the joint body, a drill pipe female joint 4 provided at the right end thereof, and a plurality of wear-resistant devices 2 installed on the joint body;

[0038] The outer circumferential surface of the drill pipe male joint 1 at the left end is provided with an external anti-torsion secondary shoulder 11, an external thread 12, a stress relief groove 13 and an external anti-torsion main shoulder 14 in sequence from left to right;

[0039] The inner circumferential surface of the drill pipe female joint 4 at the right end is provided with an inner torsion-resistant secondary shoulder 41, an internal thread 42 and an inner torsion-resistant primary shoulder 43 in sequence from left to right;

[0040] When the drill pipe male connector 1 is rotated and engaged with the drill pipe female connector 4 used in conjunction with it, the external thread 12 is screwed into the internal thread 42 and gradually tightened so that the external anti-torsion main shoulder 14 gradually contacts the internal anti-torsion main shoulder 43 used in conjunction with it until an interference fit is formed, and the distance between the external anti-torsion secondary shoulder 11 and the internal anti-torsion secondary shoulder 41 used in conjunction with it gradually decreases until a transition fit is formed;

[0041] Each of the wear-resistant devices 2 is embedded in the middle of the left thickened part of the outer circumferential surface of the joint body and is evenly distributed at equal intervals. It includes a support block 21, a wear-resistant belt 22 and a screw 23. The support block 21 is connected to the joint body through the screw 23, and the wear-resistant belt 22 is welded and fixed to the outer surface of the support block 21.

[0042] The utility model adopts the design of metal-to-metal double-shoulder torsion-resistant structure, which greatly improves the torsional strength and air-sealing effect, ensuring the connection strength and air-sealing effect under complex well conditions such as deep wells, ultra-deep wells, and high-pressure wells; in addition, the utility model adopts the design of replaceable wear-resistant device to reduce the overall joint damage rate, increase service life and greatly reduce cost.

[0043] In addition, the present invention adopts a stress relief groove design, which optimizes the structural design, improves the product's stress corrosion resistance, and extends its service life.

[0044] It should be noted that the wear-resistant devices 2 are preferably 3 groups, and may also be 4 groups or 5 groups.

[0045] It should be noted that a specific embodiment of the external thread 12 has the following structure: the external thread 12 is provided on the outer side of the end of the drill pipe male connector 1, with a pitch of 6.35 mm and a taper of 1:6.

[0046] It should be noted that a specific embodiment of the internal thread 42 is as follows: the internal thread 42 is provided on the inner side of the end of the drill pipe female joint 4, with a pitch of 6.35 mm and a taper of 1:6.

[0047] It should be noted that a specific embodiment of the drill pipe male joint 1 is as follows: the outer diameter of the small end cylinder of the drill pipe male joint 1 is D1 = 119 ± 0.5 mm, the outer diameter of the large end cylinder is D2 = 145 ± 0.5 mm, the inner diameter d = 101.6 ± 0.5 mm, and the shoulder distance L2 of the drill pipe female joint - the shoulder distance L1 of the drill pipe male joint = +0 ~ +0.15 mm.

[0048] It should be noted that the wear-resistant device 2 is replaceable, and the distance between the screw and the inner diameter t1-the wall thickness of the joint body T≥0.

[0049] Example 2

[0050] In this embodiment, a plurality of tightening slots 3 for rotating the drilling threaded joint are provided in the middle of the right thickened portion of the outer circumferential surface of the joint body.

[0051] It should be noted that the number of the tightening slots 3 is preferably 5, 6 or 7.

[0052] Among them, the inner diameter of the tightening slot D3 = 8 mm, and the distance between the tightening slot and the inner diameter t2-the wall thickness of the joint body T≥0.

[0053] The design of the tightening slot of the utility model adds a manual screwing method. The plug-in is inserted into the slot, and the plug-in is pushed to drive the joint to rotate. It can replace the screw-on machine that requires a larger operating space, avoids injuries from machines in narrow spaces, and greatly improves safety and operability.

[0054] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-shouldered high-torsion-resistance drilling threaded joint, characterized in that: It comprises a joint body, a drill pipe male joint (1) arranged at the left end of the joint body, a drill pipe female joint (4) at the right end, and a plurality of wear-resistant devices (2) installed on the joint body; The outer circumferential surface of the drill pipe male joint (1) at the left end is provided with an external anti-torsion secondary shoulder (11), an external thread (12), a stress relief groove (13) and an external anti-torsion main shoulder (14) in sequence from left to right; The inner circumferential surface of the drill pipe female joint (4) at the right end is provided with an inner torsion-resistant secondary shoulder (41), an internal thread (42) and an inner torsion-resistant main shoulder (43) in sequence from left to right; When the drill pipe male connector (1) and the drill pipe female connector (4) used in conjunction with it are rotated and engaged, the external thread (12) is screwed into the internal thread (42), and is gradually tightened so that the external anti-torsion main shoulder (14) and the internal anti-torsion main shoulder (43) used in conjunction with it gradually contact each other until an interference fit is generated, and the distance between the external anti-torsion secondary shoulder (11) and the internal anti-torsion secondary shoulder (41) used in conjunction with it gradually decreases until a transition fit is generated; Each of the wear-resistant devices (2) is embedded in the middle of the left thickened portion of the outer circumferential surface of the joint body and is evenly distributed at equal intervals. It includes a support block (21), a wear-resistant belt (22) and a screw (23). The support block (21) is connected to the joint body through the screw (23), and the wear-resistant belt (22) is welded and fixed to the outer surface of the support block (21).

2. A double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: The wear-resistant devices (2) are in three groups.

3. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: The external thread (12) is arranged on the outside of the end of the drill pipe male joint (1), with a thread pitch of 6.35 mm and a taper of 1:

6.

4. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: The internal thread (42) is arranged on the inner side of the end of the drill pipe female joint (4), with a thread pitch of 6.35 mm and a taper of 1:

6.

5. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: The outer diameter (D1) of the small end cylinder of the drill pipe male joint (1) is 119±0.5 mm, the outer diameter (D2) of the large end cylinder is 145±0.5 mm, the inner diameter (d) is 101.6±0.5 mm, and the drill pipe female joint shoulder distance (L2) - the drill pipe male joint shoulder distance (L1) is +0 to +0.15 mm.

6. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: The wear-resistant device (2) is replaceable, and the distance between the screw and the inner diameter (t1) minus the wall thickness of the joint body (T) is ≥0.

7. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 1, characterized in that: A plurality of tightening slots (3) for rotating the drilling threaded joint are provided in the middle of the right thickened portion of the outer circumferential surface of the joint body.

8. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 7, characterized in that: The number of the tightening slots (3) is 5.

9. The double-shouldered high-torsion-resistance drilling threaded joint according to claim 8, characterized in that: The inner diameter of the tightening slot (D3) is 8 mm, and the distance between the tightening slot and the inner diameter (t2) - the wall thickness of the connector body (T) is ≥ 0.

Images