CN-121993068-A - Integral hollow rod lifting safety joint

Abstract

The invention relates to the field of oil and gas well exploitation, in particular to an integral hollow rod lifting safety joint which is used for solving the problems that after a screw pump is blocked, an existing connecting mode can take out a hollow rod only by lifting and sawing, and the production cost and the maintenance difficulty are increased. The device comprises a shearing structure, wherein the shearing structure is arranged between an upper joint and a lower joint, and can transmit torque force to a stator of a screw pump and can be separated from the stator when the stator is blocked. According to the scheme, the hollow rod is lifted up when the pump is clamped through the application of the shearing structure, the shearing structure is broken, the upper connector is separated from the lower connector, the hollow rod is rapidly lifted out, the maintenance flow is greatly simplified, and the working efficiency is improved.

Inventors

• LV ZHIXIN
• DENG LUNING
• FANG YANBO
• LIU YU
• TIAN CHAOYANG
• LIU ZHE
• LI GANG
• LI YULONG
• HAN ENJUN
• CUI CHENBIN

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241101

Claims (8)

1. 1. Integral type hollow rod carries draws safety joint, its characterized in that: Comprises a shear structure (100); the shearing structure (100) is arranged between the upper joint (200) and the lower joint (300); The shear structure (100) is capable of transmitting torque forces to a stator of a progressive cavity pump, and is separable from the stator when the stator is stuck.
2. 2. The integrated hollow bar pull safety joint of claim 1, wherein: the shearing structure (100) comprises a square plug body (110); the upper part of the square plug body (110) is provided with a first concave hole, and the lower part of the square plug body is provided with a second concave hole; a through slot is arranged between the first concave hole and the second concave hole; the first concave hole is in threaded connection with the upper joint (200) through an internal thread; the lower connector (300) is spliced with the second concave hole; The lower connector (300) is fixedly connected with the second concave hole through a shear pin (120).
3. 3. The integrated hollow bar pull safety joint of claim 2, wherein: The side wall of the second concave hole is provided with a first connecting hole which is axially symmetrical; the upper joint (200) is provided with a second connecting hole matched with the first connecting hole; The shear pin (120) penetrates the first and second connection holes.
4. 4. A unitary hollow bar pull safety joint as claimed in claim 3 wherein: the upper part of the lower joint (300) is provided with a lug (310); the projection (310) is slidably coupled to the slot.
5. 5. The integrated hollow bar pull safety joint of claim 4, wherein: the cross section of the slot is rectangular; The cross section of the lug (310) is rectangular matched with the slot.
6. 6. The integrated hollow bar pull safety joint of claim 5, wherein: the cross section shape of the slot is symmetrical relative to the center of the axle center of the square plug body (110).
7. 7. The integrated hollow bar pull safety joint of claim 6, wherein: A space is arranged between the lower part of the upper joint (200) and the upper part of the lug (310).
8. 8. The integrated hollow bar pull safety joint of claim 7, wherein: and locking nut (210) are arranged on the side wall of the upper connector (200).

Description

Integral hollow rod lifting safety joint Technical Field The invention relates to the field of oil and gas well exploitation, in particular to an integrated hollow rod lifting safety joint. Background Screw pumps are widely used in oil and gas well exploitation. However, screw pumps often face a series of failure problems in actual operation due to the extremely complex and harsh downhole environment. The operating environment of screw pumps is often filled with high temperature, high pressure and corrosive media, which can lead to reduced performance or even failure of the equipment. Common failures in the well production process include well waxing, well sand production, well scaling, and the like. These problems not only affect the normal operation of the screw pump, but may also cause the occurrence of a stuck pump phenomenon. Specifically, paraffin deposition in crude oil is precipitated and attached to the surfaces of pipelines and equipment under low temperature conditions, so that a solid wax layer is formed, and fluid flow is blocked. Sand production from the well is due to formation instability, sand entering the wellbore, wearing equipment and plugging the flow path. Oil well scaling refers to the deposition of minerals on equipment surfaces, forming a hard scale layer, reducing equipment efficiency. When the screw pump is stuck, the pump checking operation is usually required to be carried out through maintenance to restore the production capacity. However, most of the existing screw pump designs adopt a hollow rod direct connection mode, and when the screw pump rotor is blocked, the screw pump rotor cannot be directly lifted out, and only a method of sawing while lifting can be adopted. The method not only consumes a great deal of manpower and time, but also causes great waste of raw materials of the oil well, and increases production cost and maintenance difficulty. Therefore, how to improve the reliability of screw pumps in harsh downhole environments is a highly desirable problem in the field of oil and gas recovery. Disclosure of Invention The invention provides an integrated hollow rod lifting safety joint, which is used for solving the problems that after a screw pump is blocked, the hollow rod can be taken out only by lifting and sawing the screw pump in the existing connection mode, and the production cost and the maintenance difficulty are increased. In order to alleviate the technical problems, the technical scheme provided by the invention is as follows: the invention provides an integral hollow rod lifting safety joint, which comprises a shearing structure; The shearing structure is arranged between the upper joint and the lower joint; the shear structure is capable of transmitting torque force to the stator of the progressive cavity pump and is separable from the stator when the stator is stuck. Still further, the method further comprises the steps of, The cutting structure comprises a square plug body; The upper part of the square plug body is provided with a first concave hole, and the lower part of the square plug body is provided with a second concave hole; a through slot is arranged between the first concave hole and the second concave hole; The first concave hole is in threaded connection with the upper joint through an internal thread; The lower connector is spliced with the second concave hole; the lower joint is fixedly connected with the second concave hole through a shear pin. Still further, the method further comprises the steps of, The side wall of the second concave hole is provided with a first connecting hole which is axially symmetrical; the upper joint is provided with a second connecting hole matched with the first connecting hole; The shear pin penetrates through the first connecting hole and the second connecting hole. Still further, the method further comprises the steps of, The upper part of the lower joint is provided with a lug; the protruding block is connected with the slot in a sliding way. Still further, the method further comprises the steps of, The cross section of the slot is rectangular; The cross section of the lug is rectangular matched with the slot. Still further, the method further comprises the steps of, The cross section shape of the slot is symmetrical relative to the center of the axle center of the square plug body. Still further, the method further comprises the steps of, The lower part of the upper joint is provided with a space with the upper part of the lug. Still further, the method further comprises the steps of, The upper joint side wall is provided with locking nut. The beneficial effects of the integral hollow rod lifting safety joint in the invention are analyzed as follows: the device comprises a shearing structure, wherein the shearing structure is arranged between an upper joint and a lower joint, and can transmit torque force to a stator of a screw pump and can be separated from the stator when the stator is blocked. Accordin