井网对溶蚀孔洞型储集层水驱开发特征的影响实验  

Experiments on the influences of well pattern on water flooding characteristics of dissolution vug-cave reservoir

作　　者：王敬 刘慧卿[1,2] 张景[3] 赵卫[1,2] 黄义涛 康志江[4] 郑松青 WANG Jing;LIU Huiqing;ZHANG Jing;ZHAO Wei;HUANG Yitao;KANG Zhijiang;ZHENG Songqing(State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum,Beijing 102249,China;MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing 102249,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Exploration and Production Research Institute,Sinopec,Beijing 100083,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)教育部重点实验室,北京102249 [3]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [4]中国石化石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2018年第6期1035-1042,共8页Petroleum Exploration and Development

基　　金：国家科技重大专项"缝洞型油藏改善水驱潜力及效果预测方法研究"(2016ZX05014-003-004);中国石油大学(北京)优秀青年学者科研基金(2462018QNXZ01)

摘　　要：根据相似准则理论,选取火山岩露头岩样建立实验模型,开展裂缝型与无裂缝型溶蚀孔洞储集层五点井网、九点井网、五点转九点井网、井位与裂缝相对位置、注入井注入速度等多种方式的水驱油开发实验,分析不同实验方案的开发指标变化规律,总结不同井网的水驱开发特征,探索最优注水开发方式。研究表明,无裂缝溶蚀孔洞型储集层,五点井网水驱波及范围小,水窜严重,采收率低,转九点井网后,采收率可较大幅度提高,但对距离较远的角井效果不明显,裂缝-溶蚀孔洞型储集层,注采井不在连通裂缝上,裂缝可以更好地沟通连通性较差的溶蚀孔洞,改善水驱开发效果;无论溶蚀孔洞型储集层有无裂缝,九点井网开发效果明显优于五点井网、五点井网转九点井网,边井开发指标优于角井,且有裂缝时更明显;九点井网水驱至高含水期,将角井转注变为交错井网后采收率可进一步提高;注入井提高注水速度,有助于提高九点井网距离较远角井的产油量,提高最终采收率,但无水采油期大幅缩短,无水采收率大幅下降。Based on the similarity criterion,volcanic rock samples were taken from outcrops to make experimental models.Water flooding experiments of five-spot well pattern,nine-spot well pattern,five-spot to nine-spot well pattern,the relationship between relative well and fracture positions,and injection rate in dissolution vug-cave reservoirs with/without fractures were carried out to analyze variation regularities of development indexes,find out development characteristics of water flooding with different well patterns and sort out the optimal water flooding development mode.For dissolution vug-cave reservoirs without fractures,five-spot well pattern waterflooding has very small sweeping area,serious water channeling and low oil recovery.When the well pattern was adjusted from five-spot to nine-spot well pattern,oil recovery could be largely improved,but the corner well far from the injector is little affected.In dissolution vug-cave reservoirs with fractures,when the injector and producer are not connected by fractures,the fractures could effectively connect the poorly linked vugs to improve the development effect of water flooding.Whether there are fractures or not in dissolution vug-cave reservoirs,the development effect of nine-spot well-pattern is much better than that of five-spot well pattern and five-spot to nine-spot well pattern,this is more evident when there are fractures,and the edge well has better development indexes than corner well.At the high-water cut stage of water flooding with nine-spot well pattern,the oil recovery can be further improved with staggered line-drive pattern by converting the corner well into injection well.It is helpful to increase the oil production of corner well of nine-spot well pattern by increasing the injection rate,and improve ultimate oil recovery,but the water-free production period would be greatly shortened and water-free recovery would decrease.

关 键 词：相似准则 溶蚀孔洞型储集层 水驱 注采井网 布井方式 注水速度 开发指标 采收率 

分 类 号：TE341[石油与天然气工程—油气田开发工程]