苏里格气田老井侧钻水平井开发技术与应用

doi:10.7657/XJPG20220316

摘要/Abstract

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0.42×10⁸ m³/km²;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2.9×10⁴ m³,累计增产3.13×10⁸ m³。

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

Abstract:

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 mid-channel bar,braided channel,and middle or bottom of the mid-channel 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 0.42×10⁸ m³/km² on the plane. Using 3D geological model,stratigraphic dip evaluation,pilot hole information and data acquired while drilling,the horizontal-well geosteering sidetracking technology was formed,and three horizontal-section 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 2.9×10⁴ m³,and the cumulative incremental production is 3.13×10⁸ m³.

Key words: Ordos basin, Sulige gas field, existing well sidetracking, horizontal well, tight sandstone, recovery of reserves, existing well stimulation

中图分类号:

TE243

王丽琼, 王志恒, 马羽龙, 曾庆雄, 郑凡. 苏里格气田老井侧钻水平井开发技术与应用[J]. 新疆石油地质, 2022, 43(3): 368-377.

WANG Liqiong, WANG Zhiheng, MA Yulong, ZENG Qingxiong, ZHENG Fan. Technologies and Application of Sidetracking Horizontal Well in Existing Wells in Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2022, 43(3): 368-377.

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