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A Method for Evaluating Formation Pressure by Mud Logging Dck Index Method

A technology of formation pressure and index method, which is applied in the detection and evaluation of formation pressure while drilling, and the field of formation pressure evaluation by mud logging dck index method, which can solve the problems that the influence of lithology cannot be eliminated, achieve real-time acquisition of mud logging parameters, and improve detection Accuracy, the effect of ensuring real-time performance

Active Publication Date: 2016-03-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned problems in the above-mentioned prior art, and proposes a method for evaluating formation pressure by the mud logging dck index method. The present invention uses the comprehensive mud logging parameters of adjacent wells to automatically calculate the regional rock strength coefficient and establish the dck index The trend line overcomes the problem that a large number of regional argillaceous rock compaction experiments are required to determine the regional correction coefficient when calculating the conventional dc index, which makes the established trend line inaccurate and cannot eliminate the influence of lithology, and improves the comprehensive logging parameters to evaluate the formation The accuracy of the pressure is improved, and the monitoring and evaluation of the formation pressure while drilling is realized, which provides a guarantee for the drilling project

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  • A Method for Evaluating Formation Pressure by Mud Logging Dck Index Method

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Embodiment 1

[0059] A method for evaluating formation pressure by mud logging dck index method, comprising: obtaining comprehensive mud logging parameters of adjacent wells, calculating regional rock strength coefficient and adjacent well dck index, and establishing the normal trend of dck index through the regional rock strength coefficient and adjacent well dck index The real-time dck index value is calculated by collecting comprehensive mud logging parameters on site, and the real-time calculated dck index value is compared with the normal trend line to evaluate the formation pressure.

[0060] Described method specifically comprises the following steps:

[0061] a. Establish dc index of adjacent wells;

[0062] b. Determine the regional rock strength coefficient;

[0063]c. Determine the dck index of the adjacent well;

[0064] d. Determine the normal trend line of the dck index;

[0065] e. Real-time calculation of positive drilling dck index;

[0066] f. Calculate formation press...

Embodiment 2

[0104] A method for evaluating formation pressure with the mud logging dck index method, comprising: selecting an adjacent well to obtain comprehensive mud logging parameters, calculating the adjacent well dck index and regional rock strength coefficient according to the comprehensive mud logging parameters, and using the adjacent well dck index and regional rock strength coefficient The normal trend line of the dck index is established, and the comprehensive logging parameters are collected on site to calculate the dck index value in real time, and the real-time calculated dck index value is compared with the normal trend line to evaluate the formation pressure.

[0105] Described method specifically comprises the following steps:

[0106] a. Establish dc index of adjacent wells;

[0107] b. Determine the regional rock strength coefficient;

[0108] c. Determine the dck index of the adjacent well;

[0109] d. Determine the normal trend line of the dck index;

[0110] e. Re...

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Abstract

The invention discloses a method for evaluating formation pressure by mud logging dck index method. The steps are: selecting adjacent wells to obtain comprehensive mud logging data, calculating regional rock strength and dck index, establishing regional correction coefficients and normal trend lines, and collecting comprehensive logging data on site. Real-time calculation of dck index value based on well information, compared with normal trend line to evaluate formation pressure. The invention overcomes the problems of difficulty in obtaining regional correction coefficients and inability to eliminate lithological influences, and improves the accuracy of evaluating formation pressure by mud logging information.

Description

technical field [0001] The invention relates to a method for evaluating formation pressure by using comprehensive mud logging information at the oil field geological exploration logging site, to be precise, a method for evaluating formation pressure by the mud logging dck index method, which is suitable for drilling in clastic rock areas Formation pressure detection and evaluation while drilling. Background technique [0002] At present, in the field of oil and natural gas drilling exploration and development technology, the pressure system of each region and each layer is extremely complex, the formation pressure and production layer pressure are high, oil, gas, and water show many layers, and the pressure window is narrow. And the accuracy of the evaluation puts forward higher requirements. It is necessary to accurately evaluate the formation pressure while drilling to ensure the smooth progress of drilling exploration. [0003] At present, the integrated mud logging sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 刘德伦魏建强粟娥罗谋兵何葵罗拥军
Owner BC P INC CHINA NAT PETROLEUM CORP
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