特种油气藏2025，Vol.32Issue(3)：86-93,8.DOI:10.3969/j.issn.1006-6535.2025.03.010
碳酸盐岩底水气藏见水前水侵预测方法
Prediction method for water invasion in carbonate gas reservoir with bottom water before water breakthrough
摘要
Abstract
To address the poor applicability of existing methods for predicting water invasion and evaluating aquifer activity in carbonate gas reservoirs with bottom water before water breakthrough,the reservoir characteristics and wa-ter invasion behaviors of such reservoirs were systematically analyzed.A mathematical model for bottom-water co-ning in carbonate gas reservoirs with bottom water was developed,incorporating derived formulas for calculating breakthrough time and water cone height.The morphological evolution of water cones at different production stages was characterized,enabling prediction of water invasion volume and water drive index before gas well breakthrough.The research results are applied to the Well PT102 in the Deng-2 gas reservoir of the Penglai Gasfield in central Si-chuan,indicating that this method combines theoretical derivation with practical application,achieving dynamic de-scription and quantitative prediction of water invasion before gas well water breakthrough,and solves the problem of early water invasion prediction in gas wells,addressing the insufficient accuracy and applicability of traditional methods.The predicted water breakthrough time is 169 days,with an absolute error of only 8 days(relative error 4.5％)compared to the measured value of 177 days.The water invasion volume before water breakthrough reaches 2.52×104 m3,and the water drive index stabilizes at 0.30,verifying the model's reliability.Reasonably reducing gas well production can effectively delay the water breakthrough time and significantly suppress the degree of water invasion.When the gas well production is reduced by 25％,the water breakthrough time can be delayed by about 24％,the cumulative water invasion volume is reduced by 18.4％,and the water drive index decreases from 0.30 to 0.27,indicating a significant suppression of water body activity.The research results fill the gap in early water inva-sion prediction methods for carbonate gas reservoirs with bottom water before water breakthrough and provide a refer-ence for optimizing production allocation in similar gas reservoirs.关键词
底水气藏/锥进/碳酸盐岩/水侵预测/水体活跃性/早期水侵/蓬莱气田Key words
gas reservoirs with bottom water/coning/carbonate/water invasion prediction/water body activity/early water invasion/Penglai Gasfield分类
能源科技引用本文复制引用
庞进,霍俞辰,许深浩,陈林,欧加强,杨洋,孔祥玲..碳酸盐岩底水气藏见水前水侵预测方法[J].特种油气藏,2025,32(3):86-93,8.基金项目
中国石油"十四五"前瞻性基础性重大科技项目"低渗气藏储量动用评价与提高采收率技术研究"(2021DJ1703) （2021DJ1703）
