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While-drilling sound wave well cementation quality evaluation method and processing device

A quality evaluation and filtering technology, applied in construction and other directions, can solve the problems of high cost and long time, and achieve the effect of good effect, comprehensive cementing quality, and shortening logging time.

Active Publication Date: 2021-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method and processing device for evaluating the quality of acoustic wave cementing while drilling. According to the principle that acoustic waves exist in sound insulation barriers while drilling, the casing wave of a monopole sound source is used to evaluate the quality of cementing to solve the problem of cable The time-consuming and high-cost problems of cementing quality evaluation in highly deviated wells and horizontal wells

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  • While-drilling sound wave well cementation quality evaluation method and processing device
  • While-drilling sound wave well cementation quality evaluation method and processing device
  • While-drilling sound wave well cementation quality evaluation method and processing device

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[0050] Such as figure 1 , 2 As shown, the present invention proposes a method for evaluating cementing quality by acoustic waves while drilling, and the working process is as follows:

[0051] Step 1. Preprocess the data while drilling, restore the waveform curve, obtain the full wave train data of the acoustic wave while drilling, and perform filtering processing according to the requirements, that is, remove the low-frequency and high-frequency logging noise in the wave train;

[0052] Step 2. According to the inherent stop band of the tool while drilling, for example Figure 4-a is the inherent stop band of a logging-while-drilling tool, and this frequency range is used for band-pass filtering, Figure 4-b From top to bottom are the LWD waveforms before and after bandpass filtering. It can be seen that the drill collar wave in the first wave after filtering is suppressed, and the remaining part is mainly casing wave;

[0053] Step 3. Calculate the energy of the first wav...

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Abstract

The invention discloses a while-drilling sound wave well cementation quality evaluation method and a processing device. The while-drilling sound wave well cementation quality evaluation method comprises the steps that 1, while-drilling data are pre-processed, and full-wave train data of array sound waves are obtained; 2, the influence of drill collar waves in the head waves is eliminated; 3, the energy of a head wave is calculated, and the wave energy of a sleeve in a window is calculated according to the length of the window; 4, a head wave array attenuation factor is calculated, and a corresponding array attenuation factor is calculated according to the obtained head wave energy; 5, a cementation index is calculated, and the cementation index is calculated by using a cementation index calculation formula according to a fitting formula of the attenuation factor of the block and the CBL; 6, the well cementation quality is comprehensively evaluated by using a cementation index curve; and 7, whether all the depth points are processed or not is judged, if so, processing is ended, and if not, the steps are repeated until all the depth points are processed. According to the while-drilling sound wave well cementation quality evaluation method, the problems of long time consumption and high cost during well cementation quality evaluation of highly-deviated wells and horizontal wells in cable logging can be solved.

Description

technical field [0001] The invention belongs to the field of applied geophysical acoustic logging, and in particular relates to a method and a processing device for evaluating cementing quality by using acoustic logging while drilling. Background technique [0002] The quality of cementing directly affects the service life of the well, and whether the entire injection and production process can be carried out smoothly. Conventional wireline tools face some challenges in the evaluation of cementing quality: first, it is difficult for conventional wireline tools to collect data in highly deviated / horizontal wells; second, due to the influence of gravity, the size of the cable tool is small and cannot be well centered, which seriously affects the data quality ; Third, conventional wireline tools are difficult to operate in high-temperature, high-pressure, high-risk wells. In addition, wireline logging is time-consuming and inefficient, which greatly increases operating costs. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/005
CPCE21B47/005
Inventor 李盛清张广栋张淼鹤苏远大唐晓明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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