低渗透气藏压裂水平井产量计算新模型  

A NEW PRODUCTION MODEL OF FRACTURED HORIZONTAL WELL IN LOW-PERMEABILITY GAS RESERVOIR

作　　者：胡永全[1] 陈星[2] 王桢[3] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南石油大学研究生学院,四川成都610500 [3]川庆钻探工程有限公司川西钻探公司,四川成都610051

出　　处：《大庆石油地质与开发》2015年第1期73-78,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05014)

摘　　要：水平井多级压裂广泛应用于低渗透气藏的开发。在预测压裂水平气井产能模型中,通常未考虑非达西流效应与气藏压力快速下降的影响。为此,将水力裂缝划分为若干单元,应用气体不稳定渗流理论和势的叠加原理,得到了多条裂缝同时生产时地层中任意一点的压降模型,再结合平面径向流产能公式,同时考虑裂缝内非达西渗流和气藏压降影响,建立了更为完善的压裂水平气井产能预测新模型。通过实例计算表明:缝长与裂缝条数对气井产量有较大影响;气藏压力的降低会导致水平井产量的快速下降,紊流作用对气井的产量也有较大的影响。多级压裂水平气井产能预测新模型为优选水力裂缝数量、裂缝长度及确定合理生产压差提供了更有效的手段。At present, the horizontal multi-stage fracturing is widely applied in the development of low-permeability gas reservoirs. In the predicting model of the fractured horizontal gas well productivity, the problems of non-Darcy flow effect and reservoir pressure rapid decline are not usually considered. Therefore the hydraulic fractures are di- vided into several units and with the help of gas unsteady percolation theory and potential superposition principle, the pressure dropping models of any point in the formation are obtained when the simultaneous production occurs for n numbers of the fractures. And furthermore, integrating with the planar radial flow formula and considering the problems of non-Darcy flow and gas reservoir pressure decline, the new well-improved predicting model is estab- lished for the productivity of the fractured horizontal gas wells. The calculations of the history case show that the fracture length and number have an obvious effects on the gas well production; the gas reservoir pressure drop can result in the rapid decline of the production, and the turbulence effect also has great influences on the output of the gas well. The new predicting model for the productivity of the multi-stage fractured horizontal gas wells provides an even more accurate way to optimize the hydraulic fracture number and length and determine reasonable production pressure difference.

关 键 词：低渗透 水平井 产量模型 压力变化 非达西流 

分 类 号：TE375[石油与天然气工程—油气田开发工程]