考虑气水界面推进的底水凝析气藏直井见水时间预测

Prediction of water breakthrough time of vertical wells for bottom water condensate gas reservoirs considering dynamic gas-water interface

崔传智 吴忠维 杨勇 王建 王瑞 吴义志3

中国石油大学（华东）石油工程学院，山东 青岛 266580 阿尔伯塔大学采矿与石油工程学院，阿尔伯塔 埃德蒙顿 T6G 2R3 中国石化胜利油田分公司勘探开发研究院，山东 东营 257015

College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China University of Alberta, School of Mining and Petroleum Engineering, Edmonton T6G 2R3, Canada Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

预测底水凝析气藏见水时间通常不考虑气水界面推进的影响，预测结果存在一定偏差。文中在综合考虑气水界面推进、凝析油析出、水质点舌进等基础上，分析了底水凝析气藏气水界面运移规律，并基于物质平衡与渗流理论，建立了底水凝析气藏直井见水时间预测公式；运用单因素分析法研究了气藏厚度、采气速度及水侵速度对见水时间的影响。结果表明：文中建立的公式能准确地预测见水时间；见水时间随气藏厚度的增加而增加，且气藏厚度越大，气水界面推进对见水时间的影响越大；见水时间随采气速度的增加而减少，且采气速度越大，气水界面推进对见水时间的影响越小；见水时间随水侵速度的增加而减少。

At present, the influence of dynamic gas-water interface is usually not considered for the time prediction of water breakthrough in bottom water condensate gas reservoir, and the prediction result is not accurate. Considering dynamic gas-water boundary, condensate and water tonguing, the migration law of gas-water interface in bottom-water condensate gas reservoirs is analyzed. With the theory of material balance and seepage, the predictive formula of water breakthrough time in bottom water condensate gas reservoirs is established. Comparing with an example, the accuracy of the formula is verified. And the effects of gas reservoir thickness, gas production rate and water invasion rate on water breakthrough time are studied by single factor analysis. The results show that water breakthrough time increases with the gas reservoir thickness. With the increase of gas reservoir thickness, the effect of dynamic gas-water interface on water breakthrough time is great. The water breakthrough time decreases with the increase of gas production rate. With the increase of gas production rate, the effect of dynamic gas-water interface on water breakthrough time is smaller. The water breakthrough time decreases with the increase of water invasion rate. It is concluded that the influence of dynamic gas-water interface on the water breakthrough time in the bottom water gas-condensate reservoir should be taken into account. And the formula can accurately predict water breakthrough time in the bottom water condensate gas reservoir.

10.6056/dkyqt201901013