低渗透油藏混相驱水气交替注入段塞比

发布时间：2019-03-09 09:23

【摘要】：水气交替(WAG)注入是改善气驱开发效果最经济有效的做法,水气交替注入段塞比(SSRWAG)是注气驱油开发设计的重要参数。但现有研究方法和结果在普遍性、个性化和效率方面仍有不足。以水气交替注入单周期为考察对象,从扩大注入气波及体积角度得到低渗透油藏水气段塞比下限;从保持低渗透油藏地层压力角度得到水气段塞比上限和水段塞连续注入时间上限;通过引入主流管突进系数概念,结合混相气驱油墙描述方法,根据达西定律推导出单WAG周期内气段塞连续注入时间上限;并给出水气段塞比约束下的气段塞连续注入时间;首次得到水气段塞比油藏工程计算数学模型。本文研究发现:水气段塞比合理区间受控于水和气的波及系数以及单WAG周期内水气段塞连续注入期间的注采比;一般低渗透油藏在油墙集中采出阶段中后期水、气段塞均需采用时间序列上的锥形段塞组合。研究成果对注气开发方案编制和气驱生产调整有重要指导作用。
[Abstract]:Water-gas alternate (WAG) injection is the most economical and effective way to improve the development effect of gas flooding. Water-gas alternate injection slug ratio (SSRWAG) is an important parameter in the development design of gas flooding. However, the existing research methods and results are still deficient in universality, individuation and efficiency. Taking the single cycle of alternating injection of water and gas as the object of investigation, the lower limit of slug ratio of water-gas segment in low permeability reservoir is obtained from the angle of expanding injection gas and volume. The upper limit of water-gas slug ratio and the upper limit of water slug continuous injection time are obtained from the angle of maintaining formation pressure in low permeability reservoir. According to Darcy's law, the upper limit of gas slug continuous injection time in single WAG period is deduced by introducing the concept of main pipe outburst coefficient and the description method of miscible gas displacement wall, and the gas slug continuous injection time constrained by water-gas slug ratio is given. For the first time, the mathematical model of water-gas sluice ratio reservoir engineering calculation is obtained. In this paper, it is found that the reasonable interval of water-gas slug ratio is controlled by the sweep coefficient of water and gas and the injection-production ratio during continuous injection of water-gas slug in a single WAG cycle. Generally, water and gas slugs in the middle and late stages of concentrated recovery of oil wall in low permeability reservoirs need to adopt tapered slug combination in time series. The research results play an important role in the preparation of gas injection development plan and the adjustment of gas drive production.
【作者单位】：提高石油采收率国家重点实验室(中国石油勘探开发研究院);国家能源CO_2驱油与埋存研发(实验)中心;大庆油田榆树林油田开发有限责任公司;中国石油天然气集团公司吉林油田分公司;
【基金】：中石油科技项目“气驱重大开发试验跟踪与研究”(ZDSY2016031)资助
【分类号】：TE348

【相似文献】