环江油田巴19区块长7段钙夹层评价与大斜度井分段压裂优化
投稿时间:2020-12-09  修订日期:2021-04-28  点此下载全文
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作者单位邮编
宋景远 北京探矿工程研究所北京100083
华油能源集团北京100012 
100012
姚谋 长庆油田采油七厂甘肃环县745700 745700
景文平 长庆油田采油七厂甘肃环县745700 745700
刘圣战 华油能源集团北京100012 100012
毛冠华 长庆油田采油七厂甘肃环县745700 745700
张恒 长庆油田采油七厂甘肃环县745700 745700
季长伟 长庆油田采油七厂甘肃环县745700 745700
中文摘要:为实现最大化油藏接触,提高油藏产出水平,长庆环江油田巴19区块长7油藏采用大斜度井开发方式。在初期压裂改造中,由于忽视了层内钙质夹层对压裂缝高的影响,导致实际裂缝的几何形态与设计产生巨大偏差,出现了邻井裂缝串通及生产高含水等问题。本文通过研究油藏剖面测井特征,在细分层位基础上分析纵向应力分布,研究“复合层效应”影响裂缝缝高延伸的关键因素,优化了分段压裂方案,获得了更好的水力裂缝几何形态和尺寸。技术调整后现场压裂工艺质量获得提高,长7段油藏压裂改造质量优良率100%,大大提高了该区块的开发水平。
中文关键词:分段压裂  钙夹层  大斜度井  复合层效应  环江油田
 
Calcic interbed evaluation and multi-stage frac optimization for high deviation wells in Chang-7 reservoir, Ba-19 Block of Huanjiang Oilfield
Abstract:In order to maximize reservoir contact and improve reservoir productivity, highly deviated wells are used in Chang-7 reservoir, Ba-19 block of Huanjiang Oilfield. In the earlier frac treatment, negligence of the influence of the calcic interbed on fracture height led to a very different actual fracture geometry from the design, resulting in the problems of fracture channeling between wells and high water cut production. With examination of reservoir profile logging characteristics, analysis of the vertical stress distribution based on the subdivision layers, and investigation of the key factors of "the composite layer effect" affecting fracture height extension, the multi-stage fracturing scheme was optimized which produced a better hydraulic fracture geometry and size. The technical modification improved fracturing treatment quality with the good rate of fracture stimulation in Chang-7 reservoir up 100%; thus, greatly improving the development level in the area.
keywords:multi-stage frac  calcic interbed  high deviation well  composite layer effect  Huanjiang Oilfield
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