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致密砂岩气藏动态储量计算方法的修正

Modification of the Calculation Method for Dynamic Reserves in Tight Sandstone Gas Reservoirs.

作者信息

He Jie, Guo Xiangdong, Cui Hongjun, Lei Kaiyu, Lei Yanyun, Zhou Lin, Liu Qinghai, Zhu Yushuang, Liu Linyu

机构信息

State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China.

No. 1 Gas Production Plant, Yanchang Oil and Gas Exploration Company, Yan'an 716000, China.

出版信息

ACS Omega. 2021 Oct 29;6(44):29955-29964. doi: 10.1021/acsomega.1c04473. eCollection 2021 Nov 9.

DOI:10.1021/acsomega.1c04473
PMID:34778667
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8582069/
Abstract

The determination of dynamic reserves is important for tight sandstone gas reservoirs in production. Based on the geological and gas data of the Yan'an gas field, the influence of pressure on the properties of natural gas is studied by mathematical methods. At the same time, the modified flowing material balance equation is established considering the changes in gas viscosity and compressibility. The result shows that (1) the viscosity of natural gas increases rapidly with pressure; (2) the deviation factor decreases with pressure ( < 15 MPa) and then increases ( > 15 MPa) with temperature; (3) the compressibility decreases rapidly with pressure and increases with temperature; (4) compared with the results of the material balance method, the average error of the flowing material balance method is 33.95%, and the accuracy of the modified flowing material balance method is higher with an average error of 1.25%; and (5) a large change in the production will affect the accuracy of the modified flowing material balance method, especially a shut-in for a long time before the pressure drop production is calculated at a certain time, so data points that are relatively consistent should be selected as far as possible to calculate the dynamic reserves. The findings of this study can help in the accurate evaluation of dynamic reserves of the tight gas reservoir in the Yan'an gas field and are an important guide for the formulation of a rational plan for the gas reservoir and its economic and efficient development.

摘要

动态储量的确定对于处于生产阶段的致密砂岩气藏至关重要。基于延安气田的地质和天然气数据，采用数学方法研究了压力对天然气性质的影响。同时，考虑气体黏度和压缩性的变化，建立了修正的流动物质平衡方程。结果表明：（1）天然气黏度随压力迅速增大；（2）偏差因子随压力降低（<15MPa），而后随温度升高（>15MPa）；（3）压缩性随压力迅速降低，随温度升高；（4）与物质平衡法结果相比，流动物质平衡法平均误差为33.95%，修正流动物质平衡法精度更高，平均误差为1.25%；（5）产量大幅变化会影响修正流动物质平衡法的精度，尤其是在计算某时刻压降生产前长时间关井的情况，因此应尽可能选择相对一致的数据点来计算动态储量。本研究结果有助于准确评价延安气田致密气藏的动态储量，对制定气藏合理开发方案及经济高效开发具有重要指导意义。

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本文引用的文献

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