渤海湾盆地沧东凹陷页岩油效益开发探索与突破  

Research and breakthrough of benefit shale oil development in Cangdong Sag,Bohai Bay Basin

作　　者：周立宏[1] 陈长伟[1] 杨飞[1] 崔宇[1] 宋舜尧[1] 官全胜[1] 周凤春[1] Zhou Lihong;Chen Changwei;Yang Fei;Cui Yu;Song Shunyao;Guan Quansheng;Zhou Fengchun(PetroChina Dagang Oilfield Company)

机构地区：[1]中国石油大港油田公司

出　　处：《中国石油勘探》2023年第4期24-33,共10页China Petroleum Exploration

基　　金：国家重点研发计划项目“重复可控冲击波技术现场适用性研究”(2020YFA0710504);中国石油天然气股份有限公司前瞻性基础性战略性科技项目“大港探区斜坡带油气藏分布序列与富集高产规律研究”(2021DJ0702);中国石油油气与新能源分公司重点科技项目“大港沧东孔二段页岩油效益开发技术研究与先导试验”(2022KT1002)。

摘　　要：渤海湾盆地黄骅坳陷沧东凹陷孔二段页岩油规模效益开发面临中低成熟页岩油主力产层评价优选、纵向多甜点层立体开发动用、复杂断块2000m长水平段优快钻完井、纹层型页岩储层高效体积压裂改造和高凝—高含蜡页岩油高效举升等难题。沧东凹陷孔二段页岩油勘探开发经历研究探索、水平井突破、产能评价和先导试验4个阶段,仍有60%的已投产水平井单井EUR小于2.0×10^(4)t,单井产量偏低成为制约湖相页岩油效益开发的瓶颈问题。通过综合分析沧东凹陷孔二段47口已投产井测井、录井、压裂参数和生产数据资料,针对复杂断块湖相页岩油效益甜点评价和箱体优选、井网部署、随钻导向、压裂改造和排采制度等方面进行了系统攻关,落实官东地区C1、C3和C5共3个效益开发甜点层,有利面积为42~53.3km^(2),估算Ⅰ类资源量1.54×10^(8)t。优选沧东凹陷5号平台孔二段C1③和C3⑧2个10m级甜点层开展页岩油效益开发先导试验,攻克复杂断块水基钻井液长水平段钻探难题,创新形成纹层型页岩油高效压裂技术,实现纹层型页岩储层渗透率提高、溶胀增能、混相降黏,5口试验井测试单井峰值产量39.6~122.3t,截至2023年6月22日已投产174~201天,累计产油3.34×10^(4)t,预测首年累计产油6.5×10^(4)t,平均单井EUR为4.11×10^(4)t,建立了复杂断块湖相页岩油规模效益开发模式。The large-scale and benefit development of shale oil in the second member of Kongdian Formation(Kong 2 member)in Cangdong Sag in Huanghua Depression face multiple challenges,such as evaluation and optimal selection of main production layers of medium-low mature shale oil,stereoscopic development and production of multiple vertical sweet spots,optimal and fast drilling and completion of horizontal section with a length of 2000 m in complex fault blocks,high-efficiency volumetric fracturing of laminated shale reservoir and high-efficiency lifting of shale oil with high viscosity and high wax content.Go through four stages of shale oil exploration,i.e.,research,breakthrough in horizontal wells and pilot test of production capacity evaluation,60%of the horizontal wells in production have a single well EUR of less than 2.0×10^(4)t,and the low single well oil rate has become a bottleneck problem restricting the benefit development of lacustrine shale oil.By comprehensively analyzing wireline logging,mud logging,fracturing parameters and production data of Kong 2 member shale oil in 47 production wells,the systematic research has been conducted on sweet spot evaluation and optimal selection of sealing box,well pattern deployment,geosteering while drilling,fracturing reconstruction,and production regime for the lacustrine shale oil in complex fault blocks,and three sweet spot layers(C1,C3 and C5)have been identified for benefit shale oil development in Guandong area,with an favorable 2 area of 42-53.3 km and the estimated ClassⅠresources of 1.54×10^(8)t.The pilot test of benefit shale oil development has been conducted on two 10 m-level sweet spot layers(C1③and C3⑧)in Kong 2 member on No.5 platform in Cangdong Sag,in which the drilling difficulty of long horizontal section by water-based drilling fluids in complex fault blocks has been solved,the high-efficiency fracturing technology for laminated shale oil has been innovated,and permeability improvement,swelling energization and viscosity reduction of miscible f

关 键 词：渤海湾盆地 沧东凹陷 断陷湖盆 孔二段 页岩油 勘探突破 效益开发 

分 类 号：TE313[石油与天然气工程—油气田开发工程]