Abnormal high-pressure gas reservoir dynamic reserve calculation method based on real strain

A technology of dynamic reserves and real strain, which is applied in earth-moving drilling, design optimization/simulation, wellbore/well components, etc. It can solve the problems of difficulty in obtaining the parameters of the calculation formula of abnormally high-pressure gas reservoirs and large dynamic reserves results. , to achieve the effect of solving the large calculation of dynamic reserves, improving the promotion prospects and improving the calculation accuracy

Pending Publication Date: 2020-06-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The present invention is based on the basic geological conditions of gas reservoirs or single wells in the research area (the internal connectivity of gas reservoirs is better, not low-permeability gas reservoirs), and establishes the calculation of early dynamic reserves of gas reservoirs based on the monitoring pressure of single wells or the average pressure of gas reservoirs. , which better solves the problem that the dynamic reserves calculated by the conventional pressure drop method are too large and the parameters of the current abnormally high pressure gas reservoir calculation formula parameters are difficult to select

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  • Abnormal high-pressure gas reservoir dynamic reserve calculation method based on real strain
  • Abnormal high-pressure gas reservoir dynamic reserve calculation method based on real strain
  • Abnormal high-pressure gas reservoir dynamic reserve calculation method based on real strain

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Embodiment 1

[0035] In the present invention, the average dimensionless parameters reflecting the comprehensive properties of abnormal high-pressure gas reservoir rocks are obtained by regression of stress-sensitive data of multiple cores, and the dynamic reserves of gas reservoirs (single wells) can be calculated by using the established calculation model, which effectively improves the abnormal high-pressure gas reservoir Develop the calculation accuracy of dynamic reserves in the early stage. Using the dynamic change characteristics of rock compressibility under real formation stress changes, the reserves of a single well or the entire gas reservoir are calculated, which effectively corrects the situation that the reserves of the conventional calculation method are too large, and provides well location deployment, scientific development for the next step of gas reservoirs. The adjustment and optimization of the single well work system plays a guiding role. The calculation of dynamic res...

Embodiment 2

[0052] In this embodiment, the present invention is further described by taking the application in Y gas reservoir as an example.

[0053] 1. Establish the expression of the rock compressibility coefficient of the target abnormally high pressure gas reservoir (block). Sampling the reservoir cores of multiple single wells in abnormally high-pressure gas reservoirs, conducting rock stress sensitivity tests, establishing the logarithmic regression function of rock pore volume and effective stress, and obtaining the average dimensionless parameters suitable for the target block to reflect the comprehensive properties of rocks b, Using the formula derived in this paper to establish the relational expression of the rock compressibility coefficient.

[0054] Using the regression function of the pore volume and effective stress of the three cores to normalize the experimental data, the average dimensionless parameter b=-0.027, which is suitable for abnormally high pressure Y gas reser...

Embodiment 3

[0061] A method for calculating dynamic reserves of abnormally high-pressure gas reservoirs based on real strain, comprising the following steps:

[0062] a. Establish the expression of the rock compressibility coefficient of the target abnormally high pressure gas reservoir: Sampling the reservoir cores of multiple single wells in the abnormally high pressure gas reservoir, conducting the rock stress sensitivity test, establishing the logarithmic regression function of the rock pore volume and effective stress, and obtaining the applicable The average dimensionless parameter b reflecting the comprehensive properties of rocks in the target block;

[0063] b. Establishment of dynamic reserve calculation model of abnormally high pressure gas reservoirs based on real strain: according to the established rock compressibility coefficient expression, establish a dynamic reserve calculation model based on real strain;

[0064] c. Calculation of dynamic reserves of abnormally high-pre...

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Abstract

The invention discloses an abnormal high-pressure gas reservoir dynamic reserve calculation method based on real strain. The method comprises the following steps of 1, building a target abnormal high-pressure gas reservoir rock compression coefficient expression, and specifically carrying out sampling of an abnormal high-pressure gas reservoir multi-port single-well reservoir rock core, carrying out rock stress sensitivity testing, establishing a logarithmic regression function of rock pore volume and effective stress to obtain an average dimensionless parameter b suitable for a target block to reflect comprehensive properties of rock; 2, establishing an abnormal high-pressure gas reservoir dynamic reserve calculation model based on the real strain, and specifically establishing a dynamicreserve calculation model based on the real strain according to the established rock compression coefficient expression; and 3, calculating dynamic reserves of the abnormal high-pressure gas reservoir, and specifically calculating dynamic reserves of the block through using monitored average pressure and a model pressure drop equation according to the dynamic reserve calculation model. According to the abnormal high-pressure gas reservoir dynamic reserve calculation method based on the real strain, the problems that a dynamic reserve calculation result is large through using a conventional pressure drop method and that parameter values of an existing abnormal high-pressure gas reservoir reserve calculation formula is difficult to obtain can be solved.

Description

technical field [0001] The invention relates to a new method for calculating dynamic reserves of abnormally high-pressure gas reservoirs under real strain, and belongs to the development field of oil and gas exploration and development. Background technique [0002] Calculation of gas reservoir reserves is a very important task. It is the basis of gas reservoir development, an important achievement of comprehensive evaluation of gas reservoirs, and the preparation of gas reservoir test production and development plans, gas reservoir production plans, and the design scale and infrastructure of development facilities. The basis for investing. For a gas reservoir that has been put into development, people are concerned about how large the dynamic reserves of the gas reservoir are. Only by determining this problem can the analysis of the development dynamics and production mechanism of the gas reservoir be carried out, so as to know and understand the development status of the g...

Claims

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Application Information

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IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00Y02A10/40
Inventor 蔡坤赤张李刘荣和孟中华范竞仁高仪君
Owner BC P INC CHINA NAT PETROLEUM CORP
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