A pull-off back-off safety joint

Abstract

The utility model discloses a kind of pull-off inverted buckle safety joints, for matching pipe column, including coaxially arranged upper joint, connecting sleeve, reverse coarse tooth trapezoidal buckle and lower joint, the upper joint lower end is sleeved on the upper end of the connecting sleeve, the connecting place of the upper joint with the connecting sleeve is connected by fixing piece, when the pipe column is lifted to the tension reaches certain value and the fixing piece is disconnected, the upper joint and connecting sleeve are in disengaged state, the lower end of the connecting sleeve is fixedly connected with the upper end of the lower joint by the reverse coarse tooth trapezoidal buckle, when oil pipe is positively rotated, connecting sleeve and lower joint are in disengaged state.The utility model increases the possibility of safety joint safety disengagement, improves downhole pipe column safety tripping.

Description

Technical Field

[0001] This utility model relates to the field of downhole oil production equipment, and in particular to a pull-out safety joint. Background Technology

[0002] Currently, to support the application of field technologies such as downhole sand control tubing, stratified water shut-off tubing, and stratified water injection tubing, a safety joint is connected to the downhole tool location. In the event of stuck drill string, the safety joint can be disengaged by pulling or rotating the tubing string forward, allowing the tool string above the safety joint to be retrieved. Currently, there are mainly single break-through safety joints or single reverse-threaded safety joints, or situations where they cannot be broken. Therefore, by combining the break-through and reverse-threading functions, the possibility of the safety joint being safely released is greatly increased, improving the likelihood of safe retrieval of the downhole tubing string.

[0003] Moreover, since downhole tubing and tools cannot be retrieved normally due to casing deformation, sand burial, scale burial, etc., it is necessary to retrieve downhole tools in sections. Currently, the main method is a single reverse-threaded safety joint. In field applications, the reverse thread is often difficult to reverse, requiring multiple sections to be retrieved later, resulting in low retrieval efficiency, high labor intensity, and long construction period. Utility Model Content

[0004] The purpose of this invention is to provide a pull-off safety connector that increases the possibility of the safety connector being safely disengaged, thereby improving the safe retrieval of the downhole tubing.

[0005] To achieve the purpose of this utility model, this utility model provides a pull-off safety connector for use with a tubing string. It includes an upper connector, a connecting sleeve, a reverse coarse-tooth trapezoidal buckle, and a lower connector 7, which are coaxially arranged. The lower end of the upper connector is sleeved on the upper end of the connecting sleeve. The connection between the upper connector and the connecting sleeve is made by a fastener. When the tubing string is lifted to a certain tensile force and the fastener is disconnected, the upper connector and the connecting sleeve are disengaged. The lower end of the connecting sleeve is fixedly connected to the upper end of the lower connector by the reverse coarse-tooth trapezoidal buckle. When the tubing is rotated in the forward direction, the connecting sleeve and the lower connector are disengaged.

[0006] A further preferred option is to use a pin as the fastener.

[0007] A further preferred option is that a drain hole is provided in the upper part of the lower connector.

[0008] A further preferred option is to install an O-ring at the connection between the lower connector and the connecting sleeve.

[0009] A further preferred option is that the upper connector is connected to the male thread of the oil pipe.

[0010] A further preferred option is that the lower connector is connected to the oil pipe female thread.

[0011] Compared with existing technologies, this invention offers the following advantages: The upper connector and connecting sleeve are fixed using a drill-fitting method, with pins connecting them. When the tension reaches a certain value, the pins are sheared, the upper connector disengages from the connecting sleeve, and the tubing above the upper connector is safely retrieved. This also allows for torque transmission, improving safety during reverse coupling release. The connection between the connecting sleeve and lower connector uses a reverse coarse-tooth trapezoidal thread. The coarse-tooth trapezoidal thread has relatively low friction, facilitating reverse coupling release. The reverse thread also facilitates safe retraction through forward-rotating tubing. It can be used with downhole sand control tubing, stratified water shut-off tubing, and stratified water injection tubing. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; 1 is the upper connector, 2 is the O-ring, 3 is the pin, 4 is the connecting sleeve, 5 is the reverse coarse thread trapezoidal buckle, 6 is the drain hole, and 7 is the lower connector. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Please see Figure 1 This utility model embodiment provides a pull-off safety connector for use with a pipe column, including an upper connector 1, a connecting sleeve 4, a reverse coarse-tooth trapezoidal buckle 5 and a lower connector 7 arranged coaxially. The lower end of the upper connector 1 is sleeved on the upper end of the connecting sleeve 4. The connection between the upper connector 1 and the connecting sleeve 4 is connected by a fastener, which is a pin 3.

[0018] When the lifting column reaches a certain tension and the fixing part is disconnected, the upper connector 1 and the connecting sleeve 4 are disengaged. The lower end of the connecting sleeve 4 is fixedly connected to the upper end of the lower connector 7 by a reverse coarse-tooth trapezoidal buckle 5. An O-ring 2 is provided at the connection between the lower connector 7 and the connecting sleeve 4.

[0019] When the oil pipe rotates forward, the connecting sleeve 4 is disconnected from the lower connector 7.

[0020] The lower connector 7 has a drain hole 6 at its upper part. The upper connector 1 is connected to the male thread of the oil pipe, and the lower connector 7 is connected to the female thread of the oil pipe.

[0021] In use, the connection between the upper connector 1 and the connecting sleeve 3 is fixed using a drilled method, with a pin 3 connecting them together. When the pulling force reaches a certain value, the pin 3 is cut, and the upper connector 1 disengages from the connecting sleeve 4, allowing the pipe column above the upper connector to be safely removed. This also enables torque transmission, improving safety during the reverse-clamp release process. The connection between the connecting sleeve 4 and the lower connector 7 uses a reverse coarse-tooth trapezoidal buckle 5. The coarse-tooth trapezoidal buckle 5 has relatively low friction, facilitating easy reverse-clamp release. The reverse buckle also facilitates safe removal by rotating the pipe column forward. After assembly, this pull-out reverse-clamp safety connector achieves both pull-out and reverse-clamp safety release functions. That is, it can disengage by forward rotation or by forceful upward lifting, greatly increasing the safety and reliability of field applications.

[0022] This invention features a simple structure, reasonable design, reliable operation, and strong stability. It can greatly reduce the labor intensity of employees, reduce well repair costs, and improve well repair work efficiency.

[0023] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A breakable snap-lock safety connector for use with tubing, characterized in that, The system includes an upper connector (1), a connecting sleeve (4), a reverse coarse-tooth trapezoidal buckle (5), and a lower connector (7) arranged coaxially. The lower end of the upper connector (1) is fitted onto the upper end of the connecting sleeve (4). The connection between the upper connector (1) and the connecting sleeve (4) is connected by a fastener. When the tubing is lifted until the tension reaches a certain value and the fastener is disconnected, the upper connector (1) and the connecting sleeve (4) are disengaged. The lower end of the connecting sleeve (4) is fixedly connected to the upper end of the lower connector (7) by the reverse coarse-tooth trapezoidal buckle (5). When the tubing is rotated in the forward direction, the connecting sleeve (4) and the lower connector (7) are disengaged.

2. The safety connector with a snap-lock mechanism according to claim 1, characterized in that: The fastener is a pin (3).

3. The safety connector with a snap-lock mechanism according to claim 1, characterized in that: The lower connector (7) has a drain hole (6) in the upper part.

4. The snap-lock safety connector according to claim 1, characterized in that: An O-ring (2) is provided at the connection between the lower connector (7) and the connecting sleeve (4).

5. A snap-lock safety connector according to claim 1, characterized in that: The upper connector (1) is connected to the male thread of the oil pipe.

6. A snap-lock safety connector according to claim 1, characterized in that: The lower connector (7) is threadedly connected to the oil pipe female thread.

Images