完井方式对致密气藏压裂水平井产能的影响  

Study on productivity analysis of fractured horizontal wells based on different completion methods in tight gas reservoir

作　　者：徐梦雅[1] 廖新维[1] 何逸凡[1] 王潇[2] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石化股份江汉油田分公司采油工艺研究院,湖北武汉430035

出　　处：《油气地质与采收率》2012年第2期67-71,115-116,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展计划"CO2减排;储存和资源利用的基础研究"(2011CB707302)

摘　　要：针对致密气藏储层特征,考虑了常规水平井、垂直压裂水平井在采用射孔和裸眼2种不同完井方式时水平井筒与裂缝的相互干扰情况,运用Green函数Newman积分法,分别推导出各向异性致密气藏压裂水平井在不同完井方式下井筒与储层耦合的非稳态渗流模型,并给出求解方法。实例计算结果表明,在相同储层与施工工艺条件下,常规水平井产能较低,压裂水平井采用裸眼完井方式所获得的产气量仅在生产初期高于射孔完井方式,生产稳定后两者基本一致;产气量随裂缝条数的增加而增加,在非稳态阶段,裂缝产气量相近;在拟稳态渗流阶段,由于裂缝间干扰明显,各裂缝中的产气量沿井筒呈"U"型分布。综合考虑生产技术与经济因素,推荐油田现场采用射孔完井的压裂水平井进行生产,压裂设计时应考虑裂缝干扰影响,适当扩大水平段两端的压裂规模。Based on the geologic characteristics of tight gas reservoir,three tight gas reservoir-fractured horizontal wellbore coupling models are derived by Green functions and Newman product principle.The models consider different completion methods and the interferences from fractures and horizontal wellbore.The example shows that under the same conditions of reservoir and application technology,the horizontal well has little production without fracturing.The flow rates of the fractured horizontal well with open hole completion are only more than that of perforation completion at the initial time.The gas production rises with the increasing number of fractures,and the flow rate in each fracture is approximately equal at the unsteady state.But,for the quasisteady state,there is a 'U' shape gas output distribution of fractures due to the interferences from fractures and wellbore.Taking the production technology and economic factors into consideration,the fractured horizontal wells with perforation completion should be more suitable for the tight gas reservoir.The interferences from fractures have to be paid enough attention in fracturing design,so,there should be longer fractures at both ends of horizontal wellbore.

关 键 词：致密气藏 压裂水平井 非稳态 拟稳态 裂缝 完井方式 

分 类 号：TE313.8[石油与天然气工程—油气田开发工程]