苏里格气田老井侧钻水平井开发技术与应用  

Technologies and Application of Sidetracking Horizontal Well in Existing Wells in Sulige Gas Field

作　　者：王丽琼 王志恒 马羽龙 曾庆雄 郑凡 WANG Liqiong;WANG Zhiheng;MA Yulong;ZENG Qingxiong;ZHENG Fan(No.4 Gas Production Plant,Changqing Oilfield Company,etroChina,Ordos,Inner Mongolia 017300,China)

机构地区：[1]中国石油长庆油田分公司第四采气厂,内蒙古鄂尔多斯017300

出　　处：《新疆石油地质》2022年第3期368-377,共10页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05050);中国石油科技重大专项(2016E-0509)。

摘　　要：为提高老井侧钻的有效储集层钻遇率,以苏里格气田苏中某区块为例,结合气田地质特征及开发现状,从优化部署和地质导向2方面总结了老井侧钻水平井配套关键地质技术,以此为基础;再从钻探效果、生产指标、效益评价等方面,研究老井侧钻水平井开发效果,综合分析各因素对侧钻井实施效果的影响。研究结果表明:心滩坝边部、辫状河道及主河道砂带内的心滩坝中部和底部为剩余气富集区;基于经济评价建立了侧钻井井位优选标准,即纵向上可动用有效厚度下限为4 m,平面上剩余储量的丰度下限为0.42×10^(8)m^(3)/km^(2);利用三维地质模型、地层倾角评价、导眼井信息及随钻数据,多手段协作形成侧钻水平井地质导向技术,并总结了3种水平段导向模式。研究区内23口侧钻水平井有效储集层平均钻遇率为59.7%,平均初期日产气量为2.9×10^(4)m^(3),累计增产3.13×10^(8) m^(3)。In order to improve the effective reservoir encounter rate during sidetracking drilling in existing wells,with a block in central Sulige gas field as an example,and combined with the geological characteristics and development status of the gas field,the key geological technologies for sidetracking horizontal drilling in existing wells were summarized from the aspects of optimal deployment and geosteering.On this basis,the development effect of sidetracking horizontal wells was discussed in light of drilling effect,production index,benefit evaluation,etc.,and the influence of various factors on the development effect was comprehensively analyzed.The research results show that the remaining gas mainly enriches in the areas including the rim of midchannel bar,braided channel,and middle or bottom of the midchannel bar in the sand belt of main channel.Based on the economic evaluation,the selection criteria for sidetracking well locations were established,that is,the lower limit of the effective thickness of recoverable beds is 4 m vertically,and the lower limit of the abundance of the remaining reserves is 0.42×10^(8)m^(3)/km^(2) on the plane.Using 3D geological model,stratigraphic dip evaluation,pilot hole information and data acquired while drilling,the horizontalwell geosteering sidetracking technology was formed,and three horizontalsection geosteering modes were provided.For 23 sidetracking horizontal wells in the study area,the average effective reservoir encounter rate is 59.7%,the average initial gas production is 2.9×10^(4)m^(3),and the cumulative incremental production is 3.13×10^(8)m^(3).

关 键 词：鄂尔多斯盆地 苏里格气田 老井侧钻 水平井 致密砂岩 储量动用 老井增产 

分 类 号：TE243[石油与天然气工程—油气井工程]