摘要
沁水盆地南部樊庄–郑庄区块裸眼多分支水平井总体开发效果不理想,低产井比例高、单井产量差异大,亟需查明主因,提高开发成效。基于研究区内十余年的开发实践,利用统计分析、回归分析等手段将产气特征归纳为持续高产、先高后低、持续低产3种类型。研究表明,含气量、渗透率、微幅构造、煤体结构是裸眼多分支水平井能否高产且持续稳产的关键地质因素,在同等富集条件下,渗透率大小是裸眼多分支水平井能否高产的关键;微幅构造与煤体结构决定了高产后能否持续稳产。低含气量、低渗透率、钻进过程分支垮塌、钻井液污染储层是持续低产井低产的主因。研究结果指导了裸眼多分支水平井工艺技术优化,大幅提高了单井产气量。
The overall development performance of open-hole multi-branch horizontal wells in Fanzhuang-Zhengzhuang block is not satisfactory because of the high proportion of low-production wells and significant difference in the production among different wells.So the main controlling factors should be researched in order to improve the development performance of open-hole multi-branch horizontal wells.Based on the development practice over 10 years in this area,this paper divides the wells into three types according to different production characteristics by statistics and regression,such as continuous high production type,high production at beginning and low production later type and continuous low production type.Studies show that gas contents,permeability,slight geo-structure and coal body structure are key geological factors determining the production and the stable production period of open-hole multi-branch horizontal wells.Permeability determines whether these wells can reach high production or not and slight geo-structure and coal body structure determine the last time for high production under the same gas content condition.The low gas contents,low permeability,collapse of the multi-branch during drilling and the pollution of drilling fluids are main causes for the continuous low production of these open-hole multi-branch horizontal wells.The results of this paper improve the technology and boost the production of open-hole multi-branch horizontal wells in Fanzhuang-Zhengzhuang block.
作者
刘春春
贾慧敏
毛生发
崔新瑞
彭鹤
李学博
张光波
LIU Chunchun;JIA Huimin;MAO Shengfa;CUI Xinrui;PENG He;LI Xuebo;ZHANG Guangbo(Shanxi CBM Exploration and Development Branch,Huabei Oilfield Company,Jincheng 048000,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2018年第5期140-145,共6页
Coal Geology & Exploration
基金
股份公司重大科技专项(2017E-1405)
集团公司排采先导试验平台(2018D-5006-37)~~
关键词
裸眼多分支
水平井
开发特征
渗透率
微幅构造
煤体结构
open-hole multi-branch
horizontal wells
development characteristics
permeability
slight geo-structure
coal body structure