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Calculation method for dynamic reserves of gas reservoir

A technology of dynamic reserves and calculation method, applied in the fields of earthwork drilling, wellbore/well components, etc., can solve the problems of lack of data, harsh use conditions, complex analysis process, etc., to overcome the harsh use conditions, the calculation process is simple and convenient Accurately calculated effect

Active Publication Date: 2018-10-02
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • Calculation method for dynamic reserves of gas reservoir
  • Calculation method for dynamic reserves of gas reservoir
  • Calculation method for dynamic reserves of gas reservoir

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Embodiment Construction

[0050] A method for calculating dynamic reserves of a gas reservoir, the method comprising the following steps:

[0051] S1. Prepare production dynamic data: obtain gas well production dynamic data, the gas well production dynamic data includes gas well daily gas production, wellhead pressure and wellhead temperature, for the needs of vertical pipe flow model calculation, eliminate production dynamic data during well shut-in period, and The gas wells whose daily production time is less than 24 hours are converted into 24-hour daily gas production to ensure the accuracy of the calculation results.

[0052] S2. Calculating the bottomhole flow pressure: according to the compiled gas well production dynamic data, select the appropriate vertical pipe flow equation to calculate the bottomhole flow pressure of the gas well;

[0053] In this embodiment, the calculation method of the bottom hole pressure is as follows:

[0054] The vertical pipe flow model is selected to calculate the...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李继强胡世莱杨棽垚姜楠袁迎中黄小亮
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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