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Four-lead oil casing threaded connection mechanism and casing string

A technology for threaded connection and oil casing, applied in the field of pipeline patching, can solve the problems of affecting the working time, long machine tightening time, slow make-up speed, etc., so as to shorten the make-up time, reduce the make-up time, and improve the operation efficiency. Effect

Pending Publication Date: 2019-03-22
CHINA UNIV OF PETROLEUM (BEIJING) +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional API threaded casing adopts a single-line structure design, the speed of make-up is slow, and the tightening time is long, which affects the working time.

Method used

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  • Four-lead oil casing threaded connection mechanism and casing string
  • Four-lead oil casing threaded connection mechanism and casing string
  • Four-lead oil casing threaded connection mechanism and casing string

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Embodiment Construction

[0038] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of the embodiments. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to t...

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Abstract

The invention provides a four-lead oil casing threaded connection mechanism and a casing string thereof. The four-lead oil casing threaded connection mechanism comprises an internal thread portion formed at one end of a first tubular member and an inner torque shoulder. The internal thread portion is provided with an internal thread with predetermined taper, the internal thread is a four-lead thread, and the internal thread is provided with a plurality of trapezoidal internal thread teeth. The guide surface angle of the internal thread teeth is larger than the bearing surface angle of the internal thread teeth. The mechanism further comprises an external thread portion formed at one end of a second tubular member and an outer torque shoulder. The external thread portion is provided with anexternal thread having the same taper as the internal thread portion, the external thread is a four-lead thread, the external thread is provided with a plurality of trapezoidal external thread teeth,and the guide surface angle of the external thread teeth is larger than the bearing surface angle of the external thread teeth. The four-lead oil casing threaded connection mechanism and the casing string have reliable performance and can achieve quick screwing to greatly improve the working effectiveness.

Description

technical field [0001] The invention relates to the technical field of pipe joint jointing, in particular to a four-lead oil casing screw connection mechanism and the casing string. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] With the rapid development of the economy, my country's demand for oil continues to increase. The drilling and production development of oilfields is getting faster and faster. How to reduce costs and increase efficiency in oilfield exploration and production is the core issue facing oil development. At present, one of the effective means to solve the problem of how to improve the cost reduction and efficiency increase in the process of oilfield exploration and production is to improve the operation timeliness. [0004] In the process of oil extraction, it is necessary to run a casing string in the well. At present, the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08E21B17/00
CPCE21B17/00E21B17/08
Inventor 殷启帅杨进李振坤施山山胡南丁张祯祥赵少伟李铁徐东升陈雷
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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