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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, wellbore/well components, etc., can solve the problems of high cost, difficult to popularize widely in oil fields, long test period, etc., achieve low cost and improve program calculation. The effect of speed and short measurement cycle

Inactive Publication Date: 2013-02-13
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current detection method of perforation and coupling in horizontal well casing is not easy to be widely used in oil fields due to high cost, long test cycle and professional operation, and provides a traction-based Detection method of perforation and coupling in horizontal well casing based on tool-driven current analysis

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

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specific Embodiment approach 1

[0030] Specific embodiment one: a kind of detection method of perforation and coupling in horizontal well casing based on tractor driving current analysis of this specific embodiment, its specific process is:

[0031] 1. Collect the driving current of the tractor, and convert the current into a 12-bit digital signal, and the tractor is located in the casing of the horizontal well for operation;

[0032] 2. Carry out fast Fourier transform to the obtained 12-bit digital signal, and select the sampling frequency and decomposition scale of wavelet decomposition according to the result of fast Fourier transform;

[0033] 3. Perform wavelet decomposition on the 12-bit digital signal, so that the different frequency components of the 12-bit digital signal are correspondingly distributed in different wavelet scales, and then carry out characteristic information on the wavelet coefficients obtained by wavelet decomposition or the single wavelet reconstruction signal Evaluation, the sp...

specific Embodiment approach 2

[0037] Specific embodiment 2: This specific embodiment is a further description of the detection method of perforation and coupling in horizontal well casing based on tractor driving current analysis described in specific embodiment 1. Step 3 in step 3 The specific process of carrying out the Tsallis wavelet time entropy operation on the wavelet coefficients with abnormal singularity or the single wavelet reconstruction signal described in the second is as follows:

[0038]The discrete wavelet coefficients of the multiresolution analysis or the single wavelet reconstruction signal matrix is ​​D={d(k), k=1, 2, L, N}, wherein, d(k) is the kth discrete wavelet coefficient or the single Branch wavelet reconstruction signal, k is discrete wavelet coefficient or element position variable in single branch wavelet reconstruction signal matrix, N is data length; define a sliding data window on wavelet coefficient or single branch wavelet reconstruction signal, window width is w∈N, the ...

specific Embodiment approach 3

[0049] Specific embodiment three: This specific embodiment is a further description of the detection method of perforation and coupling in horizontal well casing based on tractor drive current analysis described in specific embodiment 1 or 2. Step 3 in step 3 The specific process of outputting the perforation and coupling information in the casing according to the result of the input Tsallis wavelet time entropy operation using the neuron network described in the second is as follows:

[0050] 321. Classify the results of Tsallis wavelet time entropy calculation to obtain multiple sinusoidal fluctuations and multiple V-shaped fluctuations;

[0051] 322. Determine the position of the corresponding collar according to the sequential position of each sinusoidal fluctuation in the plurality of sinusoidal fluctuations;

[0052] 323. Judging the position of the perforation according to the moment when each V-shaped fluctuation appears and the crawling speed of the retractor, and jud...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00G06F17/14
Inventor 李浩昱白相林陈继开
Owner HARBIN INST OF TECH
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