Safety joint

A technology for safety joints and connecting sleeves, which is applied in drilling equipment, earth-moving drilling, drill pipes, etc., can solve problems such as difficult disconnection, operation accidents, failures, etc., to improve safety and timeliness, improve practicability, Long service life effect

Active Publication Date: 2019-05-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used safety joints mainly include the shear nail type and the buckle type. The conventional shear nail type safety joints only rely on the shear nails to connect the upper and lower joints. Accidents: zigzag reverse buckle safety joints, thread matching requires a certain degree of pre-tightening, and it is difficult to disengage
Moreover, most of the existing safety joints,

Method used

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Embodiment Construction

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0030] The invention provides a safety joint, such as figure 1 As shown, it includes an upper joint 1, a connecting sleeve 2, a positioning sliding sleeve 3, a lower joint 4, a first sealing part 5 and a second sealing part 6;

[0031] The lower part of the upper joint 1 is threadedly connected with the upper part of the connecting sleeve 2, the lower part of the connecting sleeve 2 is threaded with the upper part of the lower joint 4, the positioning sliding sleeve 3 is fixed inside the connecting sleeve 2, and the upper part of the connecting sleeve 2 and the upper part of ...

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Abstract

The invention provides a safety joint. The safety joint comprises an upper joint, a connecting sleeve, a positioning sliding sleeve, a lower joint, a first sealing part and a second sealing part. Thelower portion of the upper joint is connected with the upper portion of the connecting sleeve; the lower portion of the connecting sleeve is connected with the upper portion of the lower joint; the positioning sliding sleeve is fixed in the connecting sleeve; the first sealing part is arranged on the contact face of the upper portion of the connecting sleeve and the upper portion of the positioning sliding sleeve; the second sealing part is arranged on the contact face of the lower portion of the connecting sleeve and the lower portion of the positioning sliding sleeve; the first sealing partcomprises an upper sealing ring and a first combined sealing ring; and the second sealing part comprises a lower sealing ring and a second combined sealing ring. According to the safety joint, the sealing parts are arranged to comprise the sealing rings and the combined sealing rings; the combined sealing rings play a main sealing role, and the sealing rings play an auxiliary sealing role, therebyguaranteeing that the sealing parts can work stably in the high-temperature environment; and therefore the safety joint can have a good sealing role under the high-temperature and low-temperature working conditions and can be widely applied to the field of heavy oil thermal recovery.

Description

technical field [0001] The present application relates to the field of oil exploitation, in particular, to a safety joint. Background technique [0002] In the process of oil and gas production, the safety joint is a safety tool for disengagement and docking of the downhole pipe string. Its function is to release the stuck pipe string from the safety joint when a fault occurs downhole or the pipe string is jammed. , so as to reduce the operation risk, reduce the workload and improve the safety of the operation. Thermal oil recovery is currently the most effective heavy oil recovery technology, which involves high temperature and high pressure working conditions, steam injection pressure can reach 21MPa, and steam injection temperature can reach 350°C. Therefore, the use of safety joints in thermal recovery wells requires good sealing performance throughout the injection-production process, which requires the sealing mechanism of the safety joint to be able to withstand high...

Claims

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Application Information

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IPC IPC(8): E21B17/04E21B17/042
Inventor 范白涛张彬奇顾启林孙永涛张晓诚张博马增华刘峰
Owner CHINA NAT OFFSHORE OIL CORP
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