致密砂岩油藏体积压裂水平井产能影响因素分析  

Analysis of factors affecting productivity of volume fracturing horizontal wells in tight sandstone reservoirs

作　　者：龚悦 崔悦琦 刘畅 杜志远 刘雄 GONG Yue;CUI Yueqi;LIU Chang;DU Zhiyuan;LIU Xiong(School of Petroleum Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Department of Thermal Energy Engineering,Chengde Petroleum College,Chengde Hebei 067000,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]承德石油高等专科学校热能工程系,河北承德067000

出　　处：《石油化工应用》2024年第8期13-20,共8页Petrochemical Industry Application

基　　金：国家自然基金项目“致密油藏压裂驱油机理及原油动用微观作用机制研究”(52374038);陕西省自然科学基础研究计划项目“致密油藏靶向排油机制与调控增产机理研究”(2023-JC-QN-0427);研究生创新基金项目“致密砂岩储层压裂液置换机理及水锁解除机制研究”(YCX2412010)。

摘　　要：由于致密油藏储层存在孔隙结构复杂、渗透能力差等特征,开采较为困难。所以开采时需要采取压裂工艺对储层进行改造,形成复杂的裂缝网络,改善流体的渗流能力,以达到提高产能的目的。因此,为了进一步了解裂缝性致密油藏流体的渗流机理,更好的对产能进行评价,利用CMG油藏数值模拟软件,考虑有限导流条件,以双重介质油藏为基础,建立体积压裂水平井的致密油藏渗流模型,通过研究不同裂缝参数,分析各个参数对单井产能的影响。主要研究了微裂缝渗透率、裂缝半长、裂缝导流能力、裂缝间距、窜流系数和裂缝高度等参数对累计产油量和近井地带压力分布特征的影响。结果表明,微裂缝渗透率对累计产油量的贡献率最大,其次是裂缝半长,两者是压裂水平井开采时提高单井产能的重要影响因素;裂缝间距与裂缝导流能力对产能也有较大的影响,但在实际开采时需要合理匹配裂缝条数与水平井长度以及裂缝半长之间的关系,从而达到有效开采目的;窜流系数与裂缝高度对产能的影响有限。It is difficult to exploit tight reservoir because of its complex pore structure and poor permeability.Therefore,it is necessary to adopt fracturing technology to transform the reservoir to form a complex fracture network and improve the percolation capacity of the fluid in order to improve the productivity.Therefore,in order to further understand the fluid percolation mechanism of fractured tight reservoir and better evaluate productivity,the tight reservoir percolation model of volume fractured horizontal well is established by using CMG reservoir numerical simulation software,considering limited conductivity conditions and based on dual medium reservoir.Through the study of different fracture parameters,the effect of each parameter on single well productivity is analyzed.The effects of parameters such as microfracture permeability,fracture half-length,fracture conductivity,fracture spacing,matrix-fracture cross-flow coefficient and fracture height on cumulative oil production and pressure distribution near borehole are studied.The results show that microfracture permeability has the greatest contribution to cumulative oil production,followed by fracture half-length,which are important factors to increase single well production during fracturing horizontal well production.Fracture spacing and fracture conductivity also have a great influence on productivity,but in actual mining,it is necessary to reasonably match the relationship between the number of fractures and the length of horizontal wells and the half-length of fractures,so as to achieve the purpose of effective mining.The matrix-fracture cross-flow coefficient and fracture height have limited influence on productivity.

关 键 词：致密油藏 水力压裂水平井 微裂缝渗透率 裂缝半长 裂缝间距 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]