压裂缝高度对致密砂岩气储层水平井产能的影响  

Influence of fracturing fracture height on productivity of horizontal wells in tight sandstone reservoir

作　　者：何明舫 周长静[1,2] 古永红 崔云群[1,2] 李喆 何平[1,2] 梁凌云 HE Mingfang;ZHOU Changjing;GU Yonghong;CUI Yunqun;LI Zhe;HE Ping;LIANG Lingyun(Oil and Gas Technology Research Institute of Changqing Oilfield Company,Xi′an 700016,China;National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Field,Xi′an 700016,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,陕西西安700016 [2]低渗透油气田勘探开发国家工程实验室,陕西西安700016

出　　处：《断块油气田》2024年第4期720-725,共6页Fault-Block Oil & Gas Field

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目研究课题“不同类型储层裂缝起裂和扩展机理研究”(2021DJ4501);“致密气提高采收率技术研究与试验”(2022KT0901)。

摘　　要：越来越多的开发实践显示,对于多隔夹层型致密砂岩气藏,并不是有效储层钻遇率越高,产能越高。为搞清鄂尔多斯盆地苏里格气田盒8段储层部分低钻遇率水平井(钻遇率小于60%,最低仅31%)压裂改造效果好、产能较高(初期产能最高可达7.5×10^(4) m^(3)/d)的原因,文中综合储层发育特征、岩石力学参数并结合数值模拟方法,讨论了压裂缝高度对隔夹层发育的致密砂岩气储层水平井产能的影响。结果表明:对于隔夹层发育的致密砂岩气储层,隔夹层被压穿,使得纵向多套气层通过压裂缝与井筒连通投产,是低钻遇率水平井高产的主要原因,压裂缝高度对水平井产能有重要影响;对于隔夹层不发育的单一厚层致密砂岩气储层,随压裂缝高度增加,水平井产能并无明显变化。因此,对于长水平段(大于100 m)连续钻遇薄隔夹层的水平井,可根据致密砂岩气储层纵向砂体及气层发育情况,考虑在非有效储层段射孔压裂,并尽可能压穿纵向多套隔夹层,以明显提高气井产能。这对鄂尔多斯盆地内外类似致密砂岩气储层水平井压裂优化设计和水平井单井产能提高具有重要指导意义。More and more development practices show that for multi-interlayer tight sandstone gas reservoirs,it is not that the higher the effective reservoir drilling rate,the higher the productivity.In order to find out the reasons for the good fracturing effect and high productivity(initial productivity up to 7.5×10^(4) m^(3)/d)of horizontal wells with low drilling rate(drilling rate less than 60%,minimum only 31%)in He 8 Member of Sulige gas field in Ordos Basin,the paper combines reservoir development characteristics,rock mechanics characteristic parameters and numerical simulation methods.The effect of fracturing fracture height on the productivity of horizontal wells in tight sandstone gas reservoirs with interlayer development is discussed.The results show that for tight sandstone gas reservoirs with developed interlayers,multiple sets of vertical gas layers are connected to the wellbore through the interlayers,which is the main reason for the high production of horizontal wells with low drilling rate,and the fracturing fracture height has an important influence on the productivity of horizontal wells.For the single thick tight sandstone gas reservoir without interlayer development,the productivity of horizontal wells does not change significantly with the increase of fracturing fracture height.Therefore,for horizontal wells continuously drilled with long horizontal sections(more than 100 m)with thin interlayers,according to the development of longitudinal sand bodies and gas reservoirs in tight sandstone gas reservoirs,perforation and fracturing in non-effective reservoir sections can be considered,and multiple sets of longitudinal interlayers should be fractured as far as possible to significantly improve gas well productivity.This is of great guiding significance for the optimal design of fracturing and increase of productivity of horizontal single wells of similar tight sandstone gas reservoirs in and outside Ordos Basin.

关 键 词：隔夹层 水平井压裂 有效储层钻遇率 缝高扩展 盒8段 

分 类 号：TE377[石油与天然气工程—油气田开发工程]