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

Active Publication Date: 2021-02-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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;

Method used

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  • A real-time early warning method for casing wear risk
  • A real-time early warning method for casing wear risk
  • A real-time early warning method for casing wear risk

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0066] Depend on figure 1 and figure 2 Shown: a real-time early warning method for casing wear risk, 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 penetration rate equation to obtain the casing wear area and depth; then calculate the remaining internal pressure resistance and residual crushing strength of the casing, and calculate the remaining internal pressure safety factor and the remaining crushing safety factor of the casing. The risk level is divided by the extrusion safety factor; finally, the casing wear condition is determined according to the risk level and a real-time early warning is given; the specific steps are as follows:

[0067] Step 1: Calculate the lateral force between the drill pipe joint and the casing in sections a...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B12/02
CPCE21B12/02E21B47/00
Inventor 曾德智张海鑫李皓董宝军喻智明刘冰张恩搏施太和
Owner SOUTHWEST PETROLEUM UNIV
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