石油地质与工程2025，Vol.39Issue(1)：7-12,6.
鄂尔多斯页岩油水平井闷排采设计与实践
Design and practice of reservoir drainage in Ordos shale oil horizontal wells:a case study of Chang 7 member of Qingcheng Oilfield in Longdong area
摘要
Abstract
Ordos Basin is rich in shale oil resources,and the main development layer is Chang 7 of the Tri-assic Yanchang Formation.The reservoirs have tight physical properties,low original reservoir pressure co-efficient and strong heterogeneity,and the exploitation method is different from conventional reservoir exploi-tation.In general,large-scale volume fracturing and well closure are required for drainage for a period of time,and artificial lifting is preferred when the pressure drops to a certain degree.In view of the large difference between Chang 7 shale oil and domestic and foreign shale oil reservoir characteristics,there is a lack of theoretical methods for direct reference to the post-fracturing shut-off time and drainage work sys-tem.Therefore,taking Chang 7 shale oil development horizontal well in Longdong area as the research ob-ject,a comprehensive study was conducted on the silencing time,blowout and drainage,and lifting process after volume fracturing.The results are as follows:the minimum horizontal principal stress of the block is mainly considered to determine the time of post-fracturing stuffy well in Qingcheng Oilfield.Combined with core experiment,field practice,the reasonable time of stuffy well is optimized to be 30 days,which can be adjusted appropriately according to the measured pressure at the wellhead.According to the calculation model of nozzle size,the drawing board of nozzle selection is established,which can effectively guide the blowout work of Chang 7 shale oil.According to the number of wells on the platform,rod pumping and rod-less pumping are selected as the lifting technique.From the field application,both have the character-istics of high maintenance operation frequency and short pump inspection period.The main reason is that shale oil is generally developed by large-platform 3D horizontal Wells,and the well trajectory is more com-plex than that of conventional 2D horizontal wells.The author believes that rod-less production technology is the development direction of the large platform cluster horizontal well lifting technology,but how to extend the operation life still needs to be further studied.关键词
鄂尔多斯盆地/长7段页岩油/闷井时间/放喷制度/举升工艺Key words
Ordos Basin/shale oil reservoirs of Chang 7 member/socking time/blowout prevention sys-tem/lifting technique分类
石油、天然气工程引用本文复制引用
牛彩云,张磊,魏韦,郑刚,邓泽鲲,李明江..鄂尔多斯页岩油水平井闷排采设计与实践[J].石油地质与工程,2025,39(1):7-12,6.基金项目
中国石油天然气股份有限公司勘探与生产分公司项目"大平台集约化建产区块高效无杆举升技术研究与试验"(2102-2-5). （2102-2-5）
