Flexible short section for relieving deformation of oil casing of oil-gas well

Abstract

The invention provides a flexible short section for relieving deformation of an oil casing of an oil-gas well. The flexible short section comprises a corrugated pipe and equal-diameter straight pipes connected to the two ends of the corrugated pipe, wherein the two ends of the corrugated pipe communicate with the equal-diameter straight pipes and are integrally formed, and the distance between every two adjacent wave crests of the corrugated pipe is larger than or equal to the wall thickness of the corrugated pipe. The flexible short section for relieving the deformation of the oil casing of the oil-gas well can effectively relieve the deformation of the oil casing of the oil-gas well and guarantee the integrity and the service life of a shaft.

Description

Technical field [0001] The present invention relates to oil and gas well drilling, cementing and oil recovery technology, and in particular relates to a flexible nipple for the relief of oil and gas well tubing and casing deformation. Background technique [0002] In the oil and gas industry, from the ground to open up drilling is the oil and gas reservoir channel process plays an important role in oil and gas exploration and development in. [0003] In recent years, horizontal well technology is used scale, with the application of rotary steerable drilling technology and high build rate power of the motor, such as figure 1 Shown, the horizontal well trajectory point A (touchdown point) getting closer vertical wellbore projected point (i.e., the point A moves to the front point A ', the target distance before getting smaller), greatly improving the reservoir the contact area of ​​the wellbore. From figure 1 As can be seen, with the increase in build rate, the degree of bending tu...

AI Technical Summary

Problems solved by technology

from figure 1 It can be seen from the figure that as the build-up rate increases, the bending degree of the pipe string in the wellbore becomes larger. , fracturing or acidizing, etc.) all exert different external forces on the pipe string in the wellbore, and these external forces may cause macroscopic deformation of the pipe string, thereby affecting the smoothness of the passage in the pipe string

[0004] At present, more and more casing deformation and casing damage events occur in different stages of well completion and production, which seriously affect the life of the wellbore and the recovery of oil and gas resources.

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