Real-time early warning method for casing abrasion risk

Abstract

The invention belongs to the field of oil and gas well building safety and particularly relates to a real-time early warning method for the casing abrasion risk. The real-time early warning method ischaracterized in that firstly, the maximum lateral force between a drill rod joint and a casing is selected through calculation, the abrasion time is determined through the drilling rate equation, andthe abrasion area and depth of the casing are obtained; then the residual internal pressure strength and the residual collapsing strength of the casing are obtained, the residual internal pressure resistance safety factor and the residual collapsing resistance safety factor of the casing are calculated, and according to the obtained residual internal pressure resistance safety factor and residualcollapsing resistance safety factor of the casing, the risk grade is divided; and finally, according to the risk grade, the casing abrasion situation is determined, and real-time early warning is conducted. The real-time early warning method has the advantages that the abrasion depth of the casing at the maximum abrasion risk position can be calculated according to the well track, the abrasion quantities of the casings in current drilled and to-be-drilled wells can be pre-evaluated, and thus casing protection measures are advantageously taken in the later period.

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...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a real-time early warning method for casing wear risk, which solves the risk early warning problem faced by the casing wear due to the decrease in strength;

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