Oil pipe flaw detection method and device for well drilling/repairing operation

Abstract

The invention relates to a drilling / workover operation oil pipe flaw detection method and device. The method comprises the following steps: 1) pumping a small ball into a to-be-detected oil pipe by using water flow; (2) the pressure P1 of water flow entering the oil pipe and the volume V1 of water flow entering the oil pipe are measured; (3) the water flow pressure P2 in the oil pipe and the water flow volume V2 in the oil pipe are measured; and (4) according to the Body law: P1 * V1 = P2 * V2, on the premise that the input water flow pressure P1 entering the oil pipe and the water flow volume V1 entering the oil pipe are fixed parameters, it is guaranteed that the water flow volume V2 in the oil pipe is an invariable parameter, and whether cracks or leakage holes exist in the oil pipe or not is judged by observing the pressure change of the water flow pressure P2 in the oil pipe. According to the method, high-temperature and high-pressure flaw detection is not needed on site, whether cracks and leakage holes exist in the oil pipe or not is distinguished according to the inherent characteristics of liquid, and flaw detection is conducted on the interior of the oil pipe on the site of oil pipe tripping in well repair.

Description

technical field [0001] The invention relates to a mechanized workover operation device in the petroleum industry, in particular to an environment-friendly oil pipe flaw detection method and device for drilling / workover operation. Background technique [0002] Steel pipes are used as oil pipelines in oil fields, and the detection of oil pipes can be regarded as the detection of steel pipes. However, there are many defects in the inner wall of the tubing, which are harmful, and the general flaw detection method is not suitable. And because the use of tubing is repetitive, it plays a vital role in saving costs and ensuring safe production in oilfield production. Therefore, non-destructive testing of tubing defects has always been one of the difficult problems in the field of non-destructive testing at home and abroad. [0003] At present, the basic methods of inspection for workover tubing are as follows: [0004] 1) The oil pipe after drilling / workover operation is put forwa...

AI Technical Summary

Problems solved by technology

[0008] 1) It is necessary to centrally store and transfer the drilling / repair tubing, and there will be multiple handlings on the way, which consumes time and manpower

[0009] 2) Flaw detection needs to be cleaned in a specially established flaw detection factory, and the cost of flaw detection and transportation is high, which increases the cost of workover

[0010] 3) The current flaw detection technology is high pressure and high temperature, and there are risks and instability factors in the wellhead operation technology

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