考虑气水两相流动的页岩气井压裂-生产一体化数值模拟  

Integrated numerical simulation of hydraulic fracturing and production in shale gas well considering gas-water two-phase flow

作　　者：唐慧莹 罗山贵 梁海鹏[2] 曾波 张烈辉[1] 赵玉龙[1] 宋毅 TANG Huiying;LUO Shangui;LIANG Haipeng;ZENG Bo;ZHANG Liehui;ZHAO Yulong;SONG Yi(National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Chengdu University of Technology,Chengdu 610059,China;Shale Gas Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500 [2]成都理工大学,成都610059 [3]中国石油西南油气田公司页岩气研究院,成都610051

出　　处：《石油勘探与开发》2024年第3期597-607,共11页Petroleum Exploration and Development

基　　金：国家自然科学基金面上项目(52374043);国家自然科学基金重点项目(52234003)。

摘　　要：基于位移不连续法和离散裂缝统一管网模型,采用顺序迭代数值模拟方法,构建了考虑气水两相流动的页岩气井压裂-生产一体化数值模型。模型考虑了天然裂缝、基质物性对压裂过程的影响,且直接将压裂后地层压力及含水饱和度分布用于后续焖井、生产模拟,可以更准确地实现压裂-生产一体化模拟。模拟结果表明:储层物性参数对裂缝扩展有较大影响,合理预测压裂结束后地层压力及储层流体分布是准确预测页岩气井产气量、产液量的关键;相较于常规方法,提出的模型同时考虑压裂对基质压力及含水饱和度的影响,可以更准确地模拟产水量、产气量。将建立的模型应用于实际页岩气压裂水平井的压裂-生产一体化模拟,模拟结果与实际生产数据吻合程度较好,验证了模型的准确性。Based on the displacement discontinuity method and the discrete fracture unified pipe network model,a sequential iterative numerical method was used to construct a fracturing-production integrated numerical model of shale gas well considering the two-phase flow of gas and water.The model accounts for the influence of natural fractures and matrix properties on the fracturing process and directly applies post-fracturing formation pressure and water saturation distribution to subsequent well shut-in and production simulation,allowing for a more accurate fracturing-production integrated simulation.The results show that the reservoir physical properties have great impacts on fracture propagation,and the reasonable prediction of formation pressure and reservoir fluid distribution after the fracturing is critical to accurately predict the gas and fluid production of the shale gas wells.Compared with the conventional method,the proposed model can more accurately simulate the water and gas production by considering the impact of fracturing on both matrix pressure and water saturation.The established model is applied to the integrated fracturing-production simulation of actual horizontal shale gas wells,yielding the simulation results in good agreement with the actual production data,thus verifying the accuracy of the model.

关 键 词：页岩气井 水力压裂 压裂缝网扩展 气水两相流动 压裂-生产一体化数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]