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Coiled tubing ovality testing method

A detection method and ellipticity technology, applied in the field of ellipticity detection, can solve the problems of low sensitivity, bulky instruments, difficult ultrasonic detection methods, etc., and achieve the effects of simple detection methods, accurate results, and good measurement results.

Active Publication Date: 2013-04-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the oil pollution and other complex conditions on the surface of the coiled tubing, the ultrasonic detection method is difficult, the magnetic flux leakage detection requires strong magnetization, a demagnetization device is required, the instrument is bulky, and the sensitivity is low

Method used

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  • Coiled tubing ovality testing method
  • Coiled tubing ovality testing method
  • Coiled tubing ovality testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] As a preferred embodiment of the present invention, the present invention discloses a method for detecting the ellipticity of coiled tubing, which uses a displacement sensor to measure the lift-off heights of 8 points on the same circumference of a certain position of the coiled tubing, and then calculates the coiled tubing at this position ellipticity. The lift-off height refers to the vertical distance between the front end of the displacement sensor probe and the surface of the coiled tubing.

Embodiment approach

[0047] The invention uses an eddy current displacement sensor (hereinafter referred to as displacement sensor) to measure the lift-off height of 8 points on the same circumference of a certain position of the coiled tubing (that is, the vertical distance between the front end of the probe and the surface of the coiled tubing), and calculates the ellipticity of the coiled tubing at this position.

[0048] The specific operation includes the following steps:

[0049]Step 1, fix the mounting bracket. Put the coiled tubing into the mounting frame, tighten the bolts of the mounting frame; adjust the position and angle of the mounting frame so that the tubing is concentric with the mounting frame and perpendicular to the circular surface of the mounting frame, and then fix the mounting frame on the pipe rack.

[0050] Step 2, install the sensor. The displacement sensor extends into 8 through holes evenly distributed along the circumference, and is fixed on the mounting frame by scr...

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Abstract

The invention relates to the technical field of coiled tubing testing, and discloses a coiled tubing ovality testing method. Lift-off heights of eight points of the same circumference of a certain position of coiled tubing are detected by means of the adoption of a displacement sensor, and then ovality of the coiled tubing on the position is calculated. Compared with a magnetic flux leakage testing method and an ultrasonic testing method, the coiled tubing ovality testing method can achieve undamaged, contactless and continuous measurement, cannot be subjected to influences of non-electrical-conductivity sundries of the surface of the coiled tubing, and is suitable for coiled tubing in various specifications or straight pipes and bent pipes made of other materials.

Description

[0001] technical field [0002] The invention relates to the technical field of coiled tubing detection, in particular to a method for detecting the ellipticity of a coiled tubing. Background technique [0003] Coiled tubing technology has been widely used in workover, logging and drilling. Coiled tubing (CT) is the core component of the coiled tubing operation device, and the domestic annual usage of the coiled tubing is about 30*104m. Coiled tubing is subjected to axial load, internal pressure and bending complex stress during operation, and the main failure modes are corrosion, mechanical damage and manufacturing defects. The main problems encountered in the field use of coiled tubing are severe corrosion or rust, blisters, pits and scratches on the surface, leakage, snapping or breaking, wrinkling or bulging. If the area where the defect occurs is detected in advance and the corresponding remedial measures are taken, the number of cycles can be increased while avoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/28
Inventor 万夫周兆明刘炯黄涛程勇于润桥周咏琳王浚璞黄胜廖江李斯雨
Owner BC P INC CHINA NAT PETROLEUM CORP
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