Calculation method for dynamic reserves of gas reservoir

Abstract

The invention discloses a calculation method for dynamic reserves of gas reservoir. The calculation method aiming at solving the problems that an existing gas reservoir dynamic reserve calculation method is lack of information, harsh in use conditions or complicated in analysis process, the calculation method is based on the advantages of a material balance method and is combined with the gas seepage process, a vertical pipe flow model, a gas well productivity equation and a material balance equation. The calculation method comprises the following steps that S1, production dynamic data are prepared; S2, the bottom hole flowing pressure is calculated, specifically, the bottom hole flowing pressure of a gas well is calculated according to the processed production dynamic data of the gas well; S3, the formation static pressure is calculated, specifically, a binomial deliverability equation of the gas well is adopted to calculate the average formation pressure of the gas well; S4, flow stages are divided, specifically, a boundary control flow stage, an unstable flow stage and a transition stage are determined; and S5, the dynamic reserves are calculated, specifically, the dynamic reserves after the unstable flow stage of the gas well is finished is calculated, and the dynamic reserves is added to the cumulative gas production in the unstable flow stage to get the true dynamic reserves of the gas well.

Description

technical field [0001] The invention relates to a method for calculating the dynamic reserves of a gas reservoir, in particular to a method for calculating the dynamic reserves of a gas reservoir. Background technique [0002] The dynamic reserves of a gas reservoir refer to the total gas volume participating in the flow in the reservoir. Accurate calculation of gas reservoir dynamic reserves is an important prerequisite for correctly evaluating gas reservoir development effects, accurately predicting gas reservoir development performance, and making a good gas reservoir development plan. At present, the methods for calculating the dynamic reserves of gas reservoirs mainly include material balance method (pressure drop method), flowing material balance method and production instability analysis method, etc. The material balance method is the most accurate and reliable method for calculating the dynamic reserves of gas reservoirs, but it requires regular and long-term shut-i...

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Problems solved by technology

[0003] The present invention aims at problems such as lack of data, harsh conditions of use, or complicated analysis process in existing gas reservoir dynamic reserve calculation methods. Based on the advantages of the material balance method, combined with the gas seepage process, the vertical pipe flow model, the gas well productivity equation and the material balance equation are integrated. Propose a Calculation Method for Gas Reservoir Dynamic Reserves

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