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Instrument eccentricity correction method in horizontal well acoustic cement bond logging

A cement-bonded, horizontal well technology, applied in wellbore/well components, measurement, earth-moving drilling, etc., can solve the problems of reducing the amplitude of casing waves, affecting the effective implementation of perforation, etc., to increase the burden and improve the accuracy of evaluation , the effect of good universality

Active Publication Date: 2013-05-22
PETROCHINA CO LTD +1
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Problems solved by technology

However, the eccentricity of the instrument reduces the amplitude of the recorded casing waves, resulting in the false impression of cement bond quality evaluation preference, which in turn affects the effective implementation of perforating and fracturing measures

Method used

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  • Instrument eccentricity correction method in horizontal well acoustic cement bond logging
  • Instrument eccentricity correction method in horizontal well acoustic cement bond logging
  • Instrument eccentricity correction method in horizontal well acoustic cement bond logging

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, invention will be further described:

[0026] From Figure 1 to Figure 3 It can be seen that the eccentricity of the instrument will have a great impact on the cement bond logging data, thereby affecting the accurate evaluation of the cementing quality, so the eccentricity needs to be corrected to obtain a 3Ft sound amplitude logging curve without eccentricity.

[0027] The correction method is based on sectoral cement bond logging data. In addition to two probes with a source distance of 3 ft and 5 ft, the sector cement bond logging tool also has eight sector probes with a source distance of 2 ft. The probe is divided into eight sectors in the circumferential direction, and the angle between the centers of each sector is 45 0 , can record 8 sound amplitude curves reflecting the state of circumferential cementation. When the instrument is eccentric, the sound amplitude data of the 8 sectors will be different due to the ...

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Abstract

The invention relates to a method for correcting eccentricity influences of an acoustic cement bond logging instrument during horizontal well cementing quality evaluation in an oilfield development process. The method includes: utilizing acoustic amplitude differences of eight sectors caused by eccentricity in sector cement bond logging for computing eccentric distance in a bushing; utilizing relation of the eccentric distance and a 3ft acoustic amplitude for correcting the 3ft acoustic amplitude in an eccentric state to an amplitude in an instrument intermediate state; and recomputing a cement bond index for evaluating cementing quality. The method is capable of improving accuracy of horizontal well cementing quality evaluation, provides accurate technical data for perforation and fracturing, and meets requirements of horizontal well development.

Description

technical field [0001] The invention relates to a method for correcting the influence of the eccentricity of the acoustic wave cement bonding logging instrument when evaluating the cementing quality of a horizontal well during the oilfield development process Background technique [0002] In the process of oilfield development, horizontal well production technology has developed rapidly, but the horizontal well cementing quality logging technology as a supporting technology is relatively lagging behind, and the logging technology suitable for vertical wells is still used to evaluate the cementing quality of horizontal well sections. In vertical wells or small-angle deviated wells, the logging tool can ensure the centered state, but in the horizontal well section and highly deviated well section, the tool is eccentric in the horizontal well section under the action of gravity, and the tool cannot be centered in the casing, such as figure 1 As shown, the cementing quality logg...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00
Inventor 刘继生冯逾曾桂红董兰芳
Owner PETROCHINA CO LTD
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