裂缝参数对压裂后页岩气水平井排采影响  

Influence of Fracture Parameters on Post-fracturing Shale Gas Production in Horizontal Well

作　　者：卞晓冰[1] 蒋廷学[1] 苏瑗[1] 王海涛[1] 刘致屿 

机构地区：[1]中石化石油工程技术研究院,北京100101 [2]中国石油大学,北京102249

出　　处：《特种油气藏》2014年第4期126-129,157,共4页Special Oil & Gas Reservoirs

基　　金：中国石油化工股份有限公司科技攻关项目"页岩气网络压裂机理及设计方法研究"(P11015)

摘　　要：应用油藏数值模拟器建立了考虑页岩气吸附特征、压裂后气水分布特征及裂缝复杂形态的页岩气水平井多段压裂排采模型,基于川东南某页岩气评价井,以压裂后累计产气量和返排率最大化为目标,研究裂缝参数对页岩气压裂后排采的影响。结果表明,缝高剖面和裂缝形态对压后产气量具有显著影响,但裂缝参数对返排率无显著影响;可采取变排量、胶液前置造缝等技术实现设计的裂缝参数;示例井历史拟合结果验证了排采模型的可靠性,为相似页岩气水平井压裂优化设计提供了理论依据。Numerical simulator for reservoir is used to establish the production model of multi- stage fracturing in horizontal well.The model considers absorption of shale gas,post- fracturing gas /water distribution and complicated fracture pattern. Based on an appraisal well of shale gas in southeastern Sichuan,the influence of fracture parameters on post- fracturing production of shale gas is studied,for purpose of maximizing the post- fracturing cumulative gas production and flowback rate. The results indicate that the profile of fracture height and fracture pattern have great influence on post- fracturing gas production,but the fracture parameters have no obvious influence on flowback rate. Fracture parameters designed can be realized through variable displacement,fracture initiation with pre- pad gel fluid or other techniques. The history matching result of an example well proves the reliability of the model,providing theoretical basis for the design and optimization of fracturing operation in similar horizontal wells of shale gas.

关 键 词：页岩气 水平井 数值模拟 裂缝参数 压裂 

分 类 号：TE357[石油与天然气工程—油气田开发工程]