Device and method for casing leak detection

Abstract

The invention discloses a casing pipe leak point detection device and method. A well opening packer comprises a packer body. A sealing device is arranged inside the packer body. A coiled tubing centralizer comprises an upper fixing ring and a lower fixing ring, the upper fixing ring and the lower fixing ring are connected through a spring component, data measuring instruments comprises a first ultrasonic data measuring instrument and a second ultrasonic data measuring instrument, and the first ultrasonic data measuring instrument and the second ultrasonic data measuring instrument are arranged inside a protective device. The ultrasonic principle is adopted for measurement, and the precise leak point depth judgment is the premise of rapid accident disposal. According to the casing pipe leak point detection device and method, the measurement speed is greatly improved by means of coiled tubing continuity. The coiled tubing centralizer enables the data measuring instruments to be applicable to reducing casing pipe measurement, and the damage caused when the ultrasonic data measuring instruments make contact with the inner wall of the casing pipe is avoided, meanwhile, ultrasonic signals have the abnormal sensitivity, measurement is rapid and efficient, the high applicability of the data measuring instruments and the reliability of the testing principle are achieved, and operation of leak point detection is easier, more convenient and efficient.

Description

technical field [0001] The invention relates to the technical field of bushing detection, in particular to a casing leak detection device and method. Background technique [0002] Well integrity is the prerequisite to ensure the safe production of oil and gas wells. However, many factors such as casing quality, operating procedures, formation stress, and mechanical forces during stimulation operations will cause casing leakage points, which directly affect the injection-production well pattern and oil production. The normal production and development effect of the well. It is particularly important to find the missing point quickly and accurately. [0003] The main method of conventional casing leakage detection on the drilling site includes the packer blockage and pressure test method. Packer leak detection means that after the packer is lowered into the wellbore where the leak is suspected to be set, the wellhead is squeezed and tested to observe the pressure change of t...

AI Technical Summary

Problems solved by technology

Disadvantages: ①Easily affected by factors such as packer failure and wellbore conditions, resulting in misjudgment of lost sections; ②Not applicable to wells with diameter shrinkage; ③The construction process is relatively cumbersome, and the construction personnel work intensively

The storage ultrasonic flowmeter has the function of measuring the cross-section flow rate of the casing to detect the flow change of the whole wellbore, lift the storage ultrasonic flowmeter out of the wellhead, connect it to the computer, play back the test data, and determine the leakage point of the casing according to the flow change. The patent also requires multiple repeated inspections to lock the leakage point of the casing. The workload is heavy, the process is cumbersome, the measurement speed is slow, and the accuracy is not high.

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