Reversely-buckled safety joint with anti-falling function

Abstract

The invention relates to the technical field of oil and gas exploitation pipe column connecting devices, in particular to a left-hand thread safety connector with an anti-falling function, which is used for connecting oil and gas exploitation pipe columns and comprises an upper connector, a lower connector and a left-hand thread body. The left-hand buckle body is inserted into the lower connector, and the upper connector is inserted into the left-hand buckle body. And the upper joint can be clamped with the left-hand buckle body. When a pipe column on the lower portion is clamped in construction, the upper connector is connected with the reverse buckling body in a clamped mode, the upper pipe column is rotated to enable torque to be transmitted to the reverse buckling body, and therefore the reverse buckling body rotates relative to the lower connector to enable the lower connector to be disengaged safely. In the normal construction process, the lower pipe column droops due to the gravity of the lower pipe column, and the upper connector is not connected with the lower connector in a clamped mode. Even if the upper pipe column rotates due to misoperation, the upper pipe column drives the upper connector to rotate relative to the left-hand-thread body, torque is not transmitted to the left-hand-thread body, and therefore the situation that the safety connector is disengaged due to misoperation is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production pipe column connection devices, in particular to a reverse buckle safety joint with an anti-drop function. Background Art

[0002] When oil and natural gas are extracted from oil and gas wells, pipe strings are usually needed. Dozens or even hundreds of pipe strings need to be connected together to transport oil or natural gas.

[0003] Safety joints are one of the commonly used tools in the process of unconventional oil and gas reservoir exploitation. The pipe strings used in the process of unconventional oil and gas reservoir exploitation are generally connected by safety joints. The pipe strings are connected by safety joints. Once the construction pipe string is stuck, the pipe string can be detached at the safety joint, and the pipe string above the safety joint can be pulled out. The pipe string below the safety joint can be processed. This method can effectively improve the efficiency of handling stuck pipe strings and reduce construction risks.

[0004] At present, the commonly used safety joint structure is the reverse buckle safety joint, which connects the upper and lower joints by reverse buckle. Once the safety joint needs to be disengaged, it can be operated by forward rotation. However, this type of safety joint may cause the safety joint to be disengaged due to misoperation if the pipe string rotates during the lowering of the pipe string or construction process, resulting in complex accidents underground. Although the rotation torque can be increased by installing shear nails to prevent the safety joint from being disengaged due to misoperation, when the safety joint needs to be disengaged, the existence of shear nail torque will make it difficult to disengage the safety joint. Therefore, there is a need for a reverse buckle safety joint with an anti-disengagement function, which can effectively prevent the safety joint from being disengaged due to misoperation without increasing the disengagement torque. Summary of the invention

[0005] The invention provides a reverse buckle safety joint with an anti-disengagement function to solve the problem that the existing safety joint increases the rotation torque by installing shear nails to prevent the safety joint from being disengaged due to misoperation, which makes it difficult to disengage when it is needed.

[0006] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0007] A reverse buckle safety joint with an anti-slip function is used to connect a pipe column for oil and gas production. The reverse buckle safety joint comprises an upper joint, a lower joint and a reverse buckle body; the reverse buckle body is inserted in the lower joint, and the upper joint is inserted in the reverse buckle body; the upper joint can be clamped with the reverse buckle body; when the upper joint is clamped with the reverse buckle body, the upper joint rotates and transmits torque to the reverse buckle body, and the reverse buckle body and the lower joint rotate relative to each other to separate; when the upper joint is not clamped with the reverse buckle body, the upper joint rotates but does not transmit torque to the reverse buckle body.

[0008] Furthermore, the lower part of the reverse buckle body is provided with an external thread, and the lower joint is provided with an internal thread that cooperates with the external thread of the lower part of the reverse buckle body; when the upper joint is engaged with the reverse buckle body, the upper joint is rotated to disengage the external thread of the lower part of the reverse buckle body from the internal thread of the lower joint.

[0009] Furthermore, a plug is provided at the lower part of the upper joint, and the plug is inserted into the buckle body; when the upper joint is not engaged with the buckle body, the plug can rotate relative to the buckle body.

[0010] Furthermore, a boss is connected to the lower part of the upper joint, a groove is provided on the upper part of the reverse buckle body, and the boss can be snapped into the groove; when the boss is snapped into the groove, the upper joint can rotate to drive the reverse buckle body to rotate.

[0011] Furthermore, a pressure cap is provided, which is located at the lower part of the buckle body and has a protrusion radially arranged toward the insert tube. A notch is provided at the lower part of the insert tube and the notch can be mounted on the protrusion. The pressure cap is used to limit the relative sliding stroke between the upper joint and the buckle body.

[0012] Furthermore, an external thread is provided on the outer wall of the insert tube, and an internal thread matching the external thread on the insert tube is provided in the pressure cap.

[0013] Furthermore, a connecting hole is provided in the upper joint, an internal thread is provided in the connecting hole, and the upper joint is connected to the pipe column via the internal thread of the connecting hole.

[0014] Furthermore, a mounting tube is provided at the bottom of the lower joint, an outer wall of the mounting tube is provided with an external thread, and the lower joint is connected to the pipe column via the external thread of the mounting tube.

[0015] Furthermore, the rotation direction of the internal thread of the connecting hole is opposite to the rotation direction of the internal thread of the lower joint.

[0016] Furthermore, sealing rubber rings are installed on the inner wall and the outer wall of the buckle body.

[0017] The beneficial effects of the present invention are analyzed as follows:

[0018] The present invention provides a reverse buckle safety joint with an anti-drop function, which is used to connect a pipe column for oil and gas production.

[0019] It includes an upper joint, a lower joint and a buckle body;

[0020] The buckle body is inserted into the lower joint, and the upper joint is inserted into the buckle body;

[0021] The upper connector can be snap-connected with the reverse buckle body;

[0022] When the upper joint is engaged with the buckle body, the upper joint rotates and transmits torque to the buckle body, and the buckle body and the lower joint rotate relative to each other and are separated;

[0023] When the upper joint is not engaged with the buckle body, the upper joint rotates but does not transmit torque to the buckle body.

[0024] When the lower pipe column is stuck during construction, the lower joint needs to be separated from the upper joint. In this case, the upper pipe column continues to be pressed down, so that the upper joint is engaged with the buckle body, and the upper pipe column is rotated to transmit the torque to the buckle body, so that the buckle body rotates relative to the lower joint, so that the lower joint is safely disengaged;

[0025] During normal construction, the lower pipe string sags due to its own gravity, so that the upper joint does not engage with the lower joint. Even if the upper pipe string rotates due to misoperation, the upper pipe string drives the upper joint to rotate relative to the buckle body, and does not transmit torque to the buckle body, thus avoiding the situation where the safety joint is disengaged due to misoperation;

[0026] In summary, the safety joint provided by the present invention does not need to be provided with shear nails and will not cause accidental disengagement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 For the present invention Figure 1 AA section view of the middle buckle body;

[0030] icon:

[0031] 100, upper joint; 110, boss; 120, pressure cap; 130, connecting hole; 140, insert tube; 200, lower joint; 210, installation tube; 300, reverse buckle body; 310, sealing rubber ring; 320, groove. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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.

[0035] Example

[0036] like Figure 1 and Figure 2 As shown, the present invention provides an anti-slip safety joint with an anti-slip function, which is used to connect a pipe column for oil and gas production, and includes an upper joint 100, a lower joint 200 and an anti-slip body 300; the anti-slip body 300 is inserted into the lower joint 200, and the upper joint 100 is inserted into the anti-slip body 300; the upper joint 100 can be snap-fitted with the anti-slip body 300; when the upper joint 100 is snap-fitted with the anti-slip body 300, the upper joint 100 rotates and transmits torque to the anti-slip body 300, and the anti-slip body 300 and the lower joint 200 rotate relative to each other to separate; when the upper joint 100 is not snap-fitted with the anti-slip body 300, the upper joint 100 rotates but does not transmit torque to the anti-slip body 300.

[0037] The working mechanism of the reverse buckle safety joint with anti-drop function provided by the present invention is as follows:

[0038] The two pipe columns are connected to the upper joint 100 and the lower joint 200 respectively, the reverse buckle body 300 is installed in the lower joint 200, and the upper joint 100 is inserted into the lower joint 200 to complete the connection of the two pipe columns. During the construction process, the upper end pipe column is released and the lower end pipe column sags due to gravity. At this time, the lower joint 200 is pulled by the weight of the lower end pipe column, resulting in the upper joint 100 not being engaged with the lower joint 200. Therefore, when the upper pipe column rotates, it will only drive the upper joint 100 and the reverse buckle body 300 in the lower joint 200 to rotate relative to each other. That is, at this time, the rotation of the upper joint 100 will not transmit torque to the reverse buckle body 300, thereby not causing the reverse buckle body 300 to rotate relative to the lower joint 200 and cause accidental disengagement; if the lower end pipe column is stuck during the pipe column construction process, the effect of gravity will not cause the lower end pipe column to continue to move downward, and the lower joint 2 connected to the lower end pipe column 00 will also be difficult to rotate due to the jamming of the lower end pipe column. At this time, the upper pipe column is pressed downward, so that the upper joint 100 connected to the bottom end of the upper pipe column is close to the lower joint 200, and the relative positions of the upper joint 100 and the lower joint 200 are rotated to adjust the upper joint 100 and the lower joint 200, so that the upper joint 100 can be engaged with the reverse buckle body 300 in the lower joint 200. When the upper joint 100 is engaged with the upper part of the reverse buckle body 300, the upper joint 100 is driven to rotate by rotating the upper pipe column, and the upper joint 100 can apply torque to the reverse buckle body 300, that is, the upper joint 100 drives the reverse buckle body 300 to rotate synchronously at this time, and the reverse buckle body 300 and the lower joint 200 rotate relative to each other, so that the reverse buckle body 300 is disengaged from the lower joint 200, and the upper pipe column can cooperate with the upper joint 100 and the reverse buckle body 300 to separate from the lower joint 200, and then the lower pipe column can be processed.

[0039] Regarding the connection method between the reverse buckle body 300 and the lower connector 200, specifically:

[0040] The lower part of the reverse buckle body 300 is provided with an external thread, and the lower joint 200 is provided with an internal thread that matches the external thread of the lower part of the reverse buckle body 300; when the upper joint 100 is engaged with the reverse buckle body 300, the upper joint 100 is rotated to disengage the external thread of the lower part of the reverse buckle body 300 from the internal thread of the lower joint 200. The reverse buckle body 300 is threadedly connected with the internal thread of the inner wall of the lower joint 200 through the external thread provided on its outer wall. When the reverse buckle body 300 is subjected to the torque transmitted by the rotation of the upper joint 100, the reverse buckle body 300 rotates relative to the lower joint 200, so that the threads between the two are disengaged and the reverse buckle body 300 and the lower joint 200 are separated.

[0041] Regarding how the upper connector 100 is connected to the lower connector 200, specifically:

[0042] The lower part of the upper joint 100 is provided with an insert 140, which is inserted into the reverse buckle body 300; when the upper joint 100 is not engaged with the reverse buckle body 300, the insert 140 can rotate relative to the reverse buckle body 300. The insert 140 is inserted into the reverse buckle body 300, and the outer wall of the reverse buckle body 300 is in contact with the inner wall of the lower joint 200. The insert 140 is inserted into the reverse buckle body 300 and is in contact with the inner wall of the reverse buckle body 300, so that the reverse buckle safety joint used to connect the pipe column has sufficient sealing to prevent leakage of the transmission medium, and the outer wall of the insert 140 is in contact with the inner wall of the reverse buckle body 300, so that the relative rotation between the two is not interfered. When the upper joint 100 is not engaged with the reverse buckle body 300, the rotation of the upper joint 100 causes the insert 140 and the reverse buckle body 300 to rotate relative to each other.

[0043] Regarding how the upper connector 100 is connected to the buckle body 300, specifically:

[0044] The lower part of the upper joint 100 is connected with a boss 110, and the upper part of the reverse buckle body 300 is provided with a groove 320, and the boss 110 can be engaged in the groove 320; when the boss 110 is engaged in the groove 320, the upper joint 100 can rotate to drive the reverse buckle body 300 to rotate. When the lower pipe column is stuck, the upper pipe column is pressed down to make the upper joint 100 close to the reverse buckle body 300, so that the boss 110 at the lower part of the upper joint 100 can contact the reverse buckle body 300, and the upper joint 100 is rotated so that the boss 110 at the lower part of the upper joint 100 can be located directly above the groove 320 at the upper part of the reverse buckle body 300. At this time, if the upper joint 100 is pressed down further, the boss 110 can be engaged in the groove 320, so that when the upper joint 100 rotates, it can drive the reverse buckle body 300 to rotate relative to the lower joint 200 of the lower part of the stuck pipe column, so that the reverse buckle body 300 is separated from the lower joint 200.

[0045] The reverse buckle safety joint maintains the connection state between the upper joint 100 and the lower joint 200 when there is no need to disengage, specifically:

[0046] A pressure cap 120 is also provided at the bottom of the insert tube 140. The pressure cap 120 is located at the lower part of the reverse buckle body 300 and is provided with a protrusion radially toward the insert tube 140. A notch is provided at the lower part of the insert tube 140, and the notch can be mounted on the protrusion. The pressure cap 120 is used to limit the relative sliding stroke of the upper joint 100 and the reverse buckle body 300. After the insert tube 140 is inserted into the reverse buckle body 300, the pressure cap 120 is connected to the bottom of the insert tube 140, so that when the lower pipe column droops and drives the lower joint 200 and the reverse buckle body 300 connected to the lower joint 200 to move downward, the bottom of the reverse buckle body 300 can contact the pressure cap 120, and the pressure cap 120 supports the reverse buckle body 300, thereby ensuring that the upper joint 100 and the lower joint 200 will not be separated.

[0047] Regarding the connection method between the cannula 140 and the pressure cap 120, specifically:

[0048] The outer wall of the insert tube 140 is provided with an external thread, and the inner wall of the pressure cap 120 is provided with an internal thread that matches the external thread on the insert tube 140. When the pressure cap 120 is installed on the insert tube 140, the pressure cap 120 or the insert tube 140 is rotated so that the pressure cap 120 is installed by matching its internal thread with the external thread on the insert tube 140.

[0049] Regarding the connection method between the pipe string and the buckle safety joint, specifically:

[0050] The upper joint 100 is provided with a connection hole 130, and the connection hole 130 is provided with an internal thread, and the upper joint 100 is connected to the pipe column through the internal thread of the connection hole 130. The inner diameter of the connection hole 130 matches the upper pipe column, and when the pipe column is installed on the upper joint 100, the pipe column or the upper joint 100 is rotated so that the two are firmly connected through the thread;

[0051] The bottom of the lower joint 200 is provided with a mounting tube 210, and the outer wall of the mounting tube 210 is provided with an external thread, and the lower joint 200 is connected to the pipe column through the external thread of the mounting tube 210. The mounting tube 210 is adapted to the inner diameter of the lower pipe column, and when the pipe column is mounted on the lower joint 200, the pipe column or the lower joint 200 is rotated so that the two are firmly connected through the thread.

[0052] In order to ensure that the torque is stably transmitted to the buckle body 300 when the upper pipe string rotates, further:

[0053] The internal thread of the connection hole 130 is in the opposite direction to the internal thread of the lower joint 200. When the reverse joint safety joint needs to be disengaged, the upper joint 100 is engaged with the reverse body 300. Since the connection hole 130 is connected to the upper pipe column through its internal thread, and the lower joint 200 is connected to the reverse body 300 through its internal thread, when the pipe column is rotated forward, the threaded connection between the pipe column and the connection hole 130 in the upper joint 100 will become tighter and tighter, so that the pipe column can drive the upper joint 100 to rotate and drive the reverse body 300 and the lower joint 200 to rotate relative to each other, so that the upper pipe column and the upper joint 100 remain connected and only the reverse body 300 and the lower joint 200 are disengaged.

[0054] Among the optional solutions of this embodiment, the more preferred ones are:

[0055] Sealing rubber rings 310 are installed on the inner wall and the outer wall of the reverse buckle body 300. The sealing rubber ring 310 installed on the outer wall of the reverse buckle body 300 provides a seal for the connection between the reverse buckle body 300 and the lower joint 200, and the sealing rubber ring 310 installed on the inner wall of the reverse buckle body 300 provides a seal for the connection between the reverse buckle body 300 and the cannula 140 to prevent the transported medium from leaking from the reverse buckle safety joint.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reverse buckle safety joint with anti-drop function, used for connecting the pipe column of oil and gas production, characterized in that ； It comprises an upper joint (100), a lower joint (200) and an inverted buckle body (300); The reverse buckle body (300) is inserted into the lower joint (200), and the upper joint (100) is inserted into the reverse buckle body (300); The upper joint (100) can be snap-connected with the buckle body (300); When the upper joint (100) is engaged with the reverse buckle body (300), the upper joint (100) rotates and transmits torque to the reverse buckle body (300), and the reverse buckle body (300) and the lower joint (200) rotate relative to each other and are separated; When the upper joint (100) is not engaged with the buckle body (300), the upper joint (100) rotates but does not transmit torque to the buckle body (300).

2. The inverted safety joint with anti-drop function according to claim 1, It is characterized by: The lower part of the buckle body (300) is provided with an external thread, and the lower joint (200) is provided with an internal thread matching the external thread of the lower part of the buckle body (300); When the upper joint (100) is engaged with the buckle body (300), the upper joint (100) is rotated so that the external thread at the lower part of the buckle body (300) is disengaged from the internal thread of the lower joint (200).

3. The inverted safety joint with anti-drop function according to claim 2, It is characterized by: The lower part of the upper joint (100) is provided with an insert (140), and the insert (140) is inserted into the buckle body (300); When the upper joint (100) is not engaged with the reverse buckle body (300), the insert tube (140) can rotate relative to the reverse buckle body (300).

4. The inverted safety joint with anti-drop function according to claim 1, It is characterized by: The lower part of the upper joint (100) is connected with a boss (110), the upper part of the buckle body (300) is provided with a groove (320), and the boss (110) can be snap-fitted into the groove (320); When the boss (110) is engaged in the groove (320), the upper joint (100) can rotate to drive the buckle body (300) to rotate.

5. The inverted buckle safety joint with anti-drop function according to claim 3 is characterized in that ； A pressure cap (120) is also provided, the pressure cap (120) is located at the lower part of the buckle body (300), and a protrusion is provided radially toward the insert tube (140), and a notch is provided at the lower part of the insert tube (140), and the notch can be mounted on the protrusion; The pressing cap (120) is used to limit the relative sliding stroke of the upper joint (100) and the buckle body (300).

6. The reverse buckle safety joint with anti-drop function according to claim 5, It is characterized by: The outer wall of the insert tube (140) is provided with an external thread, and the pressure cap (120) is provided with an internal thread that matches the external thread on the insert tube (140).

7. The reverse buckle safety joint with anti-drop function according to claim 2, It is characterized by: The upper joint (100) is provided with a connection hole (130), and the connection hole (130) is provided with an internal thread. The upper joint (100) is connected to the pipe column via the internal thread of the connection hole (130).

8. The reverse buckle safety joint with anti-drop function according to claim 7, It is characterized by: A mounting tube (210) is provided at the bottom of the lower joint (200), an external thread is provided on the outer wall of the mounting tube (210), and the lower joint (200) is connected to the pipe column via the external thread of the mounting tube (210).

9. The reverse buckle safety joint with anti-drop function according to claim 7, It is characterized by: The internal thread of the connection hole (130) is in the opposite direction to the internal thread of the lower joint (200).

10. The inverted safety joint with anti-drop function according to claim 1, characterized in that ； Sealing rubber rings (310) are installed on both the inner wall and the outer wall of the buckle body (300).

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