Double-lead petroleum casing pipe threaded connection mechanism and casing pipe pillar thereof

Abstract

The invention provides a double-lead petroleum casing pipe threaded connection mechanism and a casing pipe pillar thereof. The double-lead petroleum casing pipe threaded connection mechanism comprisesan inner threaded part and an inner torque circular bead formed at one end of a first tubular part, and an outer threaded part and an outer torque circular bead formed at one end of a second tubularpart, wherein the inner threaded part is provided with an inner thread with a predetermined taper; the inner thread is a double-lead thread and is provided with multiple trapezoidal inner thread teeth; the angles of the guiding surfaces of the inner thread teeth are larger than the angles of the bearing surfaces of the inner thread teeth; the outer threaded part is provided with an outer thread with the taper same as the taper of the inner threaded part; the outer thread is a double-lead thread and is provided with multiple trapezoidal outer thread teeth; and the angles of the guiding surfacesof the outer thread teeth are larger than the angles of the bearing surfaces of the outer thread teeth. According to the double-lead petroleum casing pipe threaded connection mechanism and the casingpipe pillar thereof provided by the invention, the performance is reliable, and fast screwing can be realized, so that the operation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of pipe joint jointing, in particular to a double-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 ...

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.

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