Underground reservoir porosity measurement method during drilling

A measurement-while-drilling, porosity technology, applied in drilling measurement, drilling equipment, earth-moving drilling and production, etc., can solve the problems of complex operation and many influencing factors, achieve simple operation, wide adaptability, and meet the requirements of logging evaluation and storage. layer and the effect of discriminating reservoir fluid properties

Active Publication Date: 2012-03-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

These related methods involve many drilling and logging parameters, complex operations, many influencing factors, and many limitations in field use.

Method used

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  • Underground reservoir porosity measurement method during drilling
  • Underground reservoir porosity measurement method during drilling
  • Underground reservoir porosity measurement method during drilling

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Embodiment Construction

[0021] refer to figure 1 , the present invention utilizes mud logging devices such as comprehensive mud logging instrument, time-drilling instrument, gas measuring instrument, ROPs when drilling the reservoir measured while drilling and the average value ROPn when drilling the cap rock (non-reservoir) adjacent to the reservoir and The porosity PORa of the surface uncompacted formation with regional characteristics and the reference porosity PORb of the reservoir cap rock are calculated by POR=PORa-[(PORa-PORb)×LgROPs / LgROPn, and the real-time measurement while drilling is obtained. Reservoir porosity POR value. The POR value is also called gas porosity, which reflects the total porosity of the reservoir.

[0022] Time-drilling instrument, gas measuring instrument, comprehensive mud logging instrument, drilling instrument and other mud logging devices adopt existing drilling and mud logging equipment. Acquisition and recording During mud logging drilling, it is the time taken...

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Abstract

The invention relates to an underground reservoir porosity measurement method during drilling. When a drilling time meter, a gas logging apparatus, a comprehensive logging meter, a drilling instrument and other logging devices are used for collecting and recording logging drilling time, a reservoir porosity measurement value during drilling POR is determined by a cover layer drilling time ROPn, a reservoir drilling time ROPs, a cover layer reference porosity PORb and an area ground surface incompact formation porosity PORa. A ratio RROP of the cover layer drilling time ROPn and the reservoir drilling time ROPs is used for evaluation of the reservoir. The evaluation result is shown to users or supplied to the users through the internet so that the users can evaluate the property of the reservoir and reservoir fluid. The underground reservoir porosity measurement method during drilling is convenient to use on site, easy to operate, wide in application range and reliable in results. The absolute value of relative error is less than or equal to 15%, and the absolute value of absolute error is less than or equal to 2%. The underground reservoir porosity measurement method during drilling can meet the requirement for logging evaluation reservoir and judging the property of reservoir fluid.

Description

technical field [0001] The patent of the present invention relates to a method for measuring the porosity of an underground reservoir while drilling. It is mainly used to measure the porosity of underground reservoirs in real time while drilling in the process of drilling and logging, and provide key parameters for reservoir evaluation. Background technique [0002] In the process of geological and petroleum exploration and development drilling and mud logging services, it is generally necessary to carry out quantitative evaluation of the reservoir for the target section or well section with oil and gas shows, judge the possible existence and type of the reservoir, and combine other hydrocarbon content parameters Discrimination of reservoir fluid properties provides a basis for exploration and development decisions. [0003] In the process of drilling and mud logging services, there are three ways to measure the porosity of underground reservoirs. One is to use the LWD tool...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B45/00
Inventor 魏大农冯爱国石元会叶应贵黄强
Owner CHINA PETROLEUM & CHEM CORP
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