海上特低渗油藏压裂水平井开发效果评价——以渤海BZ油田沙三段5井区为例  

Evaluation of development effect of fracturing horizontal wells in offshore ultralow permeability reservoirs:A case study of well block 5 of Sha3 member in BZ Oilfield,Bohai Sea

作　　者：汪全林 邓琪 周军良 张运来 耿红柳 WANG Quanlin;DENG Qi;ZHOU Junliang;ZHANG Yunlai;GENG Hongliu(Bohai Petroleum Research Institute,Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《复杂油气藏》2022年第3期74-77,104,共5页Complex Hydrocarbon Reservoirs

基　　金：中国海洋石油科技重大专项“渤海典型低孔低渗油藏勘探开发关键技术研究与实践”(CNOOC-KJ-125-ZDXM-07)。

摘　　要：随着越来越多的海上特低渗储量被发现,如何对其有效开发,亟需开展相关的研究及实践。渤海BZ油田沙三段5井区是典型的特低渗薄互层油藏,在方案研究的基础上实施了两口水平井多级压裂实践,投产后采用油藏工程、数值模拟等手段对压裂效果、生产规律进行了研究。结果表明:多级压裂对特低渗油藏产能有明显的改善作用,施工中要根据储层物性特征优选最优压裂井型,并尽量增加裂缝高度,且在生产过程中应尽早注水补充地层能量,降低裂缝导流能力下降速率,使得多级压裂井产能最大化。研究成果与矿场实践基本保持一致,对海上其他特低渗油藏的开发具有一定的借鉴意义。It is critical to conduct relevant research and practice on how to efficiently develop offshore ultra-low permeability reserves as more and more of them are discovered.The third member of the Shahejie Formation's well block 5 in the Bohai BZ Oilfield is an example of a typical ultra-low permeability thin interbedded reservoir.Based on the program study,two horizontal wells were treated to multi-stage fracturing,and following production,reservoir engineering and numerical modeling were used to investigate the fracturing effect and production rule.The results show that ultra-low permeability reservoir productivity can be greatly increased through multistage fracturing.According to the reservoir's physical characteristics,the best type of fracturing well should be chosen during construction,and the fracture height should be raised as much as possible.To supplement the formation energy,slow the rate of fracture conductivity decrease,and increase the productivity of multi-stage fracturing wells,water should be injected into the production process as soon as possible.The study's results are in line with actual field practice and have some significance for the development of other offshore ultra-low permeability reservoirs.

关 键 词：海上特低渗油藏 水平井 多级压裂 裂缝参数 

分 类 号：TE357[石油与天然气工程—油气田开发工程]