威远页岩气田单井产能主控因素与开发优化技术对策  

Dominating factors on well productivity and development strategies optimization in Weiyuan shale gas play,Sichuan Basin,SW China

作　　者：马新华[1] 李熙喆[1] 梁峰[1] 万玉金[1] 石强[1] 王永辉[1] 张晓伟[1] 车明光[1] 郭伟[1] 郭为[1] MA Xinhua;LI Xizhe;LIANG Feng;WAN Yujin;SHI Qiang;WANG Yonghui;ZHANG Xiaowei;CHE Mingguang;GUO Wei;GUO Wei(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2020年第3期555-563,共9页Petroleum Exploration and Development

摘　　要：针对威远页岩气田优质储集层厚度小、水平应力差大及井间产能变化大等特点,在20余口评价井页岩储集层地质和测井评价基础上,系统分析、总结了全区100余口水平井优质储集层钻遇率、优质储集层厚度和压裂参数特征与单井测试产量的关系,明确单井产能的主控因素,提出水平井开发优化技术对策。研究表明,优质储量动用程度是决定水平井单井产能的主控因素,即页岩气水平井产能受控于优质储集层发育厚度、优质储集层钻遇长度和储集层改造程度。基于上述认识,对威远页岩气田进行了开发优化:①水平井靶体位置定于龙一1^1小层中、下部(威202井区)和龙一1^1小层(威204井区);②开发井优先部署在优质储集层厚度较大的威远县城周边区域;③采用中高强度改造方式。优化方案实施后,单井测试产量和单井预测最终可采储量均大幅提高。Weiyuan shale gas play is characterized by thin high-quality reservoir thickness,big horizontal stress difference,and big productivity differences between wells.Based on integrated evaluation of shale gas reservoir geology and well logging interpretation of more than 20 appraisal wells,a correlation was built between the single well test production rate and the high-quality reservoir length drilled in the horizontal wells,high-quality reservoir thickness and the stimulation treatment parameters in over 100 horizontal wells,the dominating factors on horizontal well productivity were found out,and optimized development strategies were proposed.The results show that the deployed reserves of high-quality reservoir are the dominating factors on horizontal well productivity.In other words,the shale gas well productivity is controlled by the thickness of the high-quality reservoir,the high-quality reservoir drilling length and the effectiveness of stimulation.Based on the above understanding,the development strategies in Weiyuan shale gas play are optimized as follows:(1)The target of horizontal wells is located in the middle and lower parts of Longyi 1^1(Wei202 area)and Longyi 1^1(Wei204 area).(2)Producing wells are drilled in priority in the surrounding areas of Weiyuan county with thick high-quality reservoir.(3)A medium to high intensity stimulation is adopted.After the implementation of these strategies,both the production rate and the estimated ultimate recovery(EUR)of individual shale gas wells have increased substantially.

关 键 词：威远页岩气田 单井产能主控因素 优质储量动用程度 优质储集层厚度 优质储集层钻遇长度 改造程度 开发优化技术对策 

分 类 号：TE328[石油与天然气工程—油气田开发工程]