疏松砂岩有水气藏产量劈分新方法

A New Production Splitting Method for Unconsolidated Sandstone Gas Reservoir with Water

王国锋 王小鲁 奎明清 赵辉 苗苗

WANGGuofeng WANGXiaolu KUIMingqing ZHAOHui MIAOMiao

南方石油勘探开发有限责任公司, 广东 广州 510240 中国石油青海油田分公司, 甘肃 敦煌 736202

Southern Petroleum Exploration and Development Co. Ltd., Guangzhou, Guangdong 510240, China Qinghai Oilfield Branch, PetroChina, Dunhuang, Gansu 736202, China

产量劈分是多层系气藏精细化描述的前提，然而目前常见的KH法、突变法、产气剖面测试以及其他产量劈分方法存在准确率低、无法长期动态产量劈分等问题。为了解决上述难点，结合考虑应力敏感的产能方程以及考虑水封气影响的有水气藏物质平衡方程，进行迭代计算，并运用自动拟合方法对生产历史进行拟合，得到最优拟合参数，创新提出一种疏松砂岩有水气藏产量劈分新方法。结果表明，对于两层合采气井，合采层的层流系数、紊流系数不同时，产量贡献率曲线呈现“X”形变化趋势；合采层的动态储量不同时，产量贡献率曲线呈现“<”形变化趋势；合采层之间的层流系数、紊流系数、动态储量差异越大，合采层之间产量贡献率差异越大。通过对涩北二号气田某气井进行实例分析，发现研究成果对于疏松砂岩有水气藏产量劈分结果与产气剖面测试结果相近（平均误差4.70%），可以实时获得产量贡献率。

Production splitting is a prerequisite for the accurate description of multilayer gas reservoirs. However, KH method, mutation method, gas production profile test and other production splitting methods commonly used at present have some problems, such as low accuracy and no long-term dynamic production splitting. In order to solve the problems, the iterative calculation was carried out by combining the stress-sensitive productivity equation and the material balance equation considering the influence of water sealed gas, and automatic fitting method was used to fit the production history, the optimal fitting parameters were obtained, and A new production splitting method for unconsolidated sandstone gas reservoir with water was innovatively proposed. The results show that when laminar coefficient and turbulent coefficient of the combined production zone are different, the contribution rate curve presents an “X ” type trend; when dynamic reserves of the combined production zone are different, the contribution rate curve of production presents a “<” type trend; the greater the difference between laminar coefficient, turbulent coefficient and dynamic reserves, the greater the difference between production contribution rates. Through the case analysis of a gas well in Sebei-2 Gas Field, it is found that the research results show that the production splitting result for unconsolidated sandstone gas reservoir with water is similar to the test result of gas production profile (average error 4.70%), and the contribution rate of production can be obtained in real time.

10.11885/j.issn.1674-5086.2023.02.20.02