低渗透气藏压裂水平井产能预测模型及其应用  

Deduction and application of deliverability prediction model for low permeability fractured horizontal gas well

作　　者：何逸凡[1] 廖新维[1,2] 徐梦雅[1] 廖红梅[3] 王春才 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [3]中国石油长庆油田分公司苏里格气田研究中心,陕西西安710018 [4]中国石油海洋工程有限公司钻井事业部,天津300451

出　　处：《油气地质与采收率》2012年第4期93-96,117,共4页Petroleum Geology and Recovery Efficiency

摘　　要：水平井技术和压裂技术都是针对低渗透气藏的有效增产手段,经常用于提高单井产能。压裂水平井由于裂缝的存在,气体经由裂缝向井筒汇聚时气量大、流速高,会造成附加的紊流压降,因此低渗透气藏压裂水平井的产能方程应该考虑裂缝中非达西流动的影响。应用复势理论和叠加原理推导了压裂水平井渗流方程,考虑了裂缝中气体紊流造成的附加压降,最终得到低渗透气藏压裂水平井的二项式产能方程,采用现场数据进行验证,并分析了气藏压裂水平井产能的影响因素。结果表明,不同位置裂缝产能贡献大小不同,压裂裂缝导流能力存在最优值; 代入现场数据计算,误差小于10%,符合实际生产要求,可以在油田生产中参考使用。Recause of the existence of fractures in fractured horizontal well, gas converges in the wellbore with high velocity and large capacity, this would cause extra turbulent pressure drop. So, the deliverability equation of fractured horizontal gas well should consider the influence of non-Darcy flow rule. This paper adopts complex potential theory and superposition principle to deduce the seepage equation of fractured horizontal well and finally obtain the binomial deliverability equation of fractured horizontal gas well after considering the additional pressure drop caused by turbulent flow in the fractures. This equation is verified by field data and the elements which can influence the turbulent flow of fractured horizontal gas well are analyzed. The result is that this equation deduced in the paper fits the demand of field production and can guide the development and production of oilfield.

关 键 词：低渗透气藏 压裂水平井 二项式产能方程 影响因素 非达西流动 导流能力 

分 类 号：TE37[石油与天然气工程—油气田开发工程]