Method for detecting perforation hole and collar in horizontal well sleeve pipe based on retractor drive current analysis

A technology of driving current and detection method, which is used in surveying, earth-moving drilling, wellbore/well components, etc., can solve the problems of large-scale promotion in difficult oil fields, high cost, long test period, etc., and achieves improved program operation speed and cost. Low, short measurement cycle effect
CN101649737AInactive Publication Date: 2010-02-17HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2010-02-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for detecting perforation holes and collars in a horizontal well sleeve pipe based on retractor drive current analysis, which relates to a method for detecting perforation holes and collars in a horizontal well sleeve pipe. The method solves the problem that because the prior method for detecting perforation holes and collars in a horizontal well sleeve pipe has high cost and long test period and needs to be operated by professional staff, the prior method is not easy to popularize in oil fields in a large scale. The method comprises the following steps: firstly, converting retractor drive current into 12-bit digital signals, carrying out quick Fourier conversion on the 12-bit digital signals, and determining sampling frequency and decomposition dimensions of small-wave decomposition according to conversion results; then, carrying out the small-wave decomposition on the 12-bit digital signals, extracting a mold maximum value, testing strangeness, and operating Tsallis small wave time entropy sequentially for decomposed small-wave coefficients or signal small-wave reconstruction signals; and finally, outputting information of perforation holes and collars in a sleeve pipe by using a nerve cell network. The method has low cost, short test period and high efficiency and is suitable for being popularized in an oil field in a large scale.
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Description

technical field

[0001] The invention relates to a method for detecting perforation and coupling in horizontal well casing. Background technique

[0002] Casing status detection in horizontal wells is an important part of production logging. In the casing status detection of horizontal wells, the detection of perforations and couplings in casings is of great significance. The position, size and distribution of perforation in the casing directly affect the three-phase flow flow state and oil and gas production in the casing, and the damage of the casing body will affect the implementation of the entire logging process. In addition, since the horizontal well casing is made of steel casings with the same length and diameter connected by couplings, the position of the retractor in the casing can be deduced only by knowing the number of retractors passing through the couplings. The existence of couplings cannot be accurately detected, and missed or false detections will directly ...

Claims

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