各向异性致密砂岩气藏分段压裂水平井气水两相产能预测模型  

Gas-water two-phase productivity prediction model of multistage fractured horizontal wells in anisotropic tight sandstone gas reservoirs

作　　者：邓美洲[1] 牛娜 尹霜 蒋燕聪 何勇明[4] 韦帅 DENG Meizhou;NIU Na;YIN Shuang;JIANG Yancong;HE Yongming;WEI Shuai(Exploration and Development Research Institute,Southwest Oil&Gas Company,SINOPEC,Chengdu City,Sichuan Province,610041,China;Exploration and Development Research Institute,Shanghai Offshore Oil&Gas Company,SINOPEC,Shanghai City,200120,China;Chuanxibei Gas Mine,Southwest Oil&Gas Field Company,PetroChina,Jiangyou City,Sichuan Province,621799,China;College of Energy,Chengdu University of Technology,Chengdu City,Sichuan Province,610059,China;Directional Drilling Company,CNPC Bohai Drilling Engineering Company Limited,Tianjin City,300457,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610041 [2]中国石化上海海洋油气分公司勘探开发研究院,上海200120 [3]中国石油西南油气田公司川西北气矿,四川江油621799 [4]成都理工大学能源学院,四川成都610059 [5]中国石油渤海钻探工程有限公司定向井技术服务分公司,天津300457

出　　处：《油气地质与采收率》2024年第3期99-111,共13页Petroleum Geology and Recovery Efficiency

基　　金：中国石化科技计划项目“新场须二气藏气水分布与开采规律研究”(34450000-22-ZC0607-0032)。

摘　　要：致密砂岩气藏具有储层物性差、孔喉结构复杂、各向异性强、初始含水饱和度覆盖范围大等特征,导致储层中流体的渗流机理复杂,为气井产能的准确预测及评价带来了巨大挑战。为此,基于气水两相非达西渗流理论,综合考虑储层各向异性、储层基质和裂缝不同程度的应力敏感性和两相启动压力梯度、高速非达西渗流效应、气体滑脱效应以及裂缝导流能力与缝间干扰等复杂因素,利用坐标变换、扰动椭圆理论、等价发展矩形理论、当量井径原理、压力叠加原理、水电相似原理等方法,建立了适用于各向异性致密砂岩气藏分段压裂水平井气水两相产能预测的新模型。通过矿场实例验证了新模型的准确性和实用性,并绘制了气水两相产能预测曲线,评价了敏感参数对产能的影响规律。研究结果表明:随着气体滑脱效应、裂缝导流能力、裂缝半长、裂缝条数、水平井井筒与地层主渗透率方向夹角的增大,压裂水平井的无阻流量增大;而随着储层各向异性、储层应力敏感性、裂缝应力敏感性、两相启动压力梯度、生产水气比增大,压裂水平井的无阻流量降低;水相对气相的流动具有抑制作用,且驱替压差越大,抑制作用越显著,因此需提前采取防水和治水措施。该研究成果进一步缩小了致密砂岩气藏产能预测结果与矿场实际产量的差距,有助于致密砂岩气藏的参数评估、动态预测以及产能评价和勘探开发决策制定。Tight sandstone gas reservoirs have the characteristics of poor physical properties of the reservoir,complex pore throat structure,strong anisotropy,and extensive coverage of initial water saturation,which lead to the complex flow mechanism of fluids in reservoirs and bring significant challenges to the accurate prediction and evaluation of gas well productivity.Therefore,based on the theory of gas-water two-phase non-Darcy flow,this study comprehensively considers the complex productivity factors,such as reservoir anisotropy,different degrees of stress sensitivity between reservoir matrix and fracture,two-phase starting pressure gradient,high-speed non-Darcy flow effect,gas slippage effect,finite conductivity of fracture,and inter-fracture interference.A new gas-water two-phase productivity prediction model for multistage fractured horizontal wells in anisotropic tight sandstone gas reservoirs is established by using coordinate transformation,perturbation ellipse theory,equivalent development rectangle theory,equivalent well diameter principle,pressure superposition principle,and hydropower similarity principle.Field examples verify the accuracy and practicability of the model.The gas-water two-phase productivity prediction curve is drawn,and the influence of sensitive parameters on productivity is evaluated.The results show that the open flow capacity of a fractured gas well increases with the increase in slippage effect,fracture conductivity,fracture half-length,fracture number,and the angles between the wellbore of the horizontal well and the main permeability of the formation.The open flow capacity of the fractured horizontal well decreases with the increase in reservoir anisotropy,reservoir stress sensitivity,fracture stress sensitivity,two-phase starting pressure gradient,and water-gas volume ratio.Water has an inhibitory effect on the flow of gas,and greater displacement pressure difference indicates a more significant inhibitory effect,so it is necessary to take waterproof and water control measures in a

关 键 词：致密砂岩气藏 分段压裂水平井 各向异性 气水两相 产能预测 

分 类 号：TE328[石油与天然气工程—油气田开发工程]