A real-time early warning method for casing wear risk

A casing and risk technology, applied in the field of real-time early warning of casing wear risk, can solve problems such as casing strength reduction
CN108104795BActive Publication Date: 2021-02-12SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2021-02-12

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Abstract

The invention belongs to the field of oil and gas well construction safety, and in particular relates to a real-time early warning method for casing wear risk. It is characterized in that: firstly, the maximum lateral force between the drill pipe joint and the casing is selected by calculation, and the wear time is determined by using the drilling speed equation, and the wear area and depth of the casing are obtained; then, the remaining internal pressure resistance strength of the casing is obtained and residual anti-collapse strength, calculate the remaining internal pressure safety factor and residual anti-extrusion safety factor of the casing, and divide the risk level according to the obtained casing residual internal pressure safety factor and residual anti-extrusion safety factor; finally determine the casing according to the risk level Pipe wear and real-time early warning. The advantage of the invention is that: the wear depth of the casing at the position with the greatest wear risk can be calculated according to the wellbore trajectory; the wear amount of the casing in the currently drilled and to-be-drilled wellbore can be pre-evaluated, which is convenient for later casing protection measure.
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Description

technical field

[0001] The invention belongs to the field of oil and gas well construction safety, and in particular relates to a real-time early warning method for casing wear risk. Background technique

[0002] During the drilling process of deep wells, ultra-deep wells, highly deviated wells, and horizontal wells, the problem of casing wear is increasingly exposed. Abrasion can reduce the wall thickness of the casing, and under certain conditions, it can cause deformation or even destruction of the casing, thereby reducing the crush resistance and internal pressure strength of the casing, and reducing the safety factor of the casing against extrusion and compression, so that it cannot be guaranteed Subsequent operation production safety.

[0003] At present, the invention patent "An automatic detection system for petroleum casing wear" (application publication number: CN 101603418A) detects the casing wear condition by collecting and analyzing the amount of magnetic wear...

Claims

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