Method for detecting azimuth of damaged oilfield downhole casing

A detection method and casing technology, which is applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problem that the specific position of the damaged part cannot be detected, and achieve the effects of small error, simple operation, convenience and accuracy

Active Publication Date: 2013-06-05
贵州航天凯山石油仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages and disadvantages, and all of them can detect casing damage, but they cannot detect the specific position of the damaged part.

Method used

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  • Method for detecting azimuth of damaged oilfield downhole casing
  • Method for detecting azimuth of damaged oilfield downhole casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1. Such as figure 1 As shown, the bushing tester 1 and the gyro inclinometer 2 are hard-connected in series. When testing, first mark on the ground to determine the position of the probe of the bushing tester 2 and the gyro inclinometer 2, and then By detecting the posture of the gyro inclinometer 2 itself, the position of the probe of the bushing detector 2 can be calculated, thereby calculating the specific orientation of the damaged part of the bushing. Gyro inclinometer 2 is an instrument used in the petroleum industry and geological exploration drilling. It is used to measure the inclination angle and azimuth angle in the strong magnetic mining area and the wellbore that has been casing. Through the measurement, it can be accurately recorded. Casing deformation caused by ground stress changes, and the instrument determines the data of inclination and azimuth angle generated in the casing.

Embodiment 2

[0012] Example 2. Such as figure 2 As shown, an azimuth measuring mechanism 3 is installed in the bushing detector 1 . The position of the probe of the casing tester 1 and the position of the azimuth measuring mechanism 3 is determined in advance during the design, and kept still; during detection, the position of the probe of the casing tester 1 can be calculated by measuring the position of the position of the azimuth measuring mechanism 3 , so as to calculate the specific orientation of the casing damage site.

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Abstract

The invention discloses a method for detecting the azimuth of a damaged oilfield downhole casing. In the method, a casing detector (1) for detecting a casing is connected with a gyroscopic clinometer (2), or an azimuth measuring mechanism (3) is mounted in the casing detector (1); the position of a probe of the casing detector (1) can be calculated by measuring the inclination of the gyroscopic clinometer (2) or the position of the azimuth measuring mechanism (3), and thus, the specific azimuth of the damaged position of the casing can be calculated. In the invention, the specific azimuth of the damaged position of the casing can be visually and precisely detected, and the method has the characteristics of high detection accuracy and less detection error and is simple and convenient to operate. The invention perfects the detection means of the downhole casing and provides important foundations for oilfield downhole analyses. The invention is applicable to the azimuth test of all downhole detection parameters.

Description

technical field [0001] The invention relates to a detection method for the damage orientation of downhole casing in an oil field. Background technique [0002] Whether the inner diameter of downhole casing in the oil field is unblocked or not directly affects the period and quality of downhole operations. At present, the methods for measuring downhole casing shape (normal, bending deformation, leaking, broken, wrong, etc.) in oil fields are multi-arm caliper imaging logging, ultrasonic TV imaging logging, eagle eye TV logging, magnetic logging, etc. These methods have their own advantages and disadvantages, and all of them can detect casing damage, but they cannot detect the specific orientation of the damaged part. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for detecting the damaged position of the downhole casing, which can intuitively and accurately detect the specific position of the damaged pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 杨华吴忠本谢雪峰陈兵清田昆曾勇
Owner 贵州航天凯山石油仪器有限公司
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