摘要
为研究气井产水对致密气藏产能的影响,以A气田为例,针对当前致密气藏产能方程因只考虑单一气相多因素或者气水两相单因素导致模拟准确性不高的问题,基于渗流力学原理,建立了考虑多因素的致密气藏气水两相压裂直井产能模型。研究结果表明:1)通过实例计算,新模型计算的无阻流量与实际产能测试的无阻流量结果相比误差较小,仅为2%,说明新模型具有一定的准确性。2)敏感性分析表明,裂缝参数对产能影响较为明显,滑脱效应和启动压力梯度对产能影响较小。3)水气比对产能影响较大,气井产水导致气井启动压力梯度增大,应力敏感性增强,渗流阻力增大,气井产能减小,在实际生产过程中应尽量避免气井见水。该模型实现了产能的准确预测,对致密砂岩气藏高效开采具有一定的指导意义。
In order to study the influence of gas well water production on the productivity of tight gas reservoirs,tak-ing gas field A as an example,aiming at the problem that the current tight gas reservoir productivity equation only considers the influence of single gas-phase multi-factor or gas-water two-phases single-factor leading to low the simu-lation accuracy,establishing a gas-water two-phase fractured straight well productivity model for tight gas reservoirs considering multi-factor base on the principle of seepage mechanics.The results of the study show that:1)Through example calculations,there is only 2%of a minor error between the unrestrained flow results calculated by the new model and the actual productivity testing indicating that the new model has a certain accuracy.2)Sensitivity analysis shows fracture parameters have more obvious impacts on productivity,slippage effect and starting pressure gradient have less impact on productivity.3)The water-gas ratio has a great influence on productivity.The water production of gas wells leads to the increase of starting pressure gradient,enhancement of stress sensitivity,and increase of seepage resistance of gas wells,with the productivity of gas wells decreasing.In the actual production process,it is advisable to avoid gas wells encountering water.The model achieves accurate productivity prediction,which has a certain guiding significance for the efficient exploitation of tight sandstone gas reservoirs.
作者
黄思婧
侯大力
强贤宇
向雪妮
龚凤鸣
余洋阳
顾康福
韩鑫
HUANG Sijing;HOU Dali;QIANG Xianyu;XIANG Xueni;GONG Fengming;YU Yangyang;GU Kangfu;HAN Xin(College of Energy,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China)
出处
《非常规油气》
2023年第6期68-74,共7页
Unconventional Oil & Gas
基金
四川省科技厅应用基础研究项目“储层条件超临界CO_(2)压裂液-页岩气-页岩多相相互作用复杂机理研究”(2021YJ0352)
油气藏地质及开发工程国家重点实验室自由探索项目“储层条件超临界CO_(2)-地层水-页岩气-页岩多相相互作用复杂机理研究”(CZ201910)。
关键词
致密气藏
压裂直井
产能预测
气水两相流
敏感因素分析
tight gas reservoirs
fractured straight wells
productivity prediction
gas-water two-phase flow
sensitivity factor analysis