摘要
针对加拿大长湖油砂区储层中下部泥砾岩层普遍发育的问题,在对目标区泥砾岩层渗透及展布特征分析的基础上,利用数值模拟方法,分三种情况,即注汽井钻遇泥砾岩层、生产井钻遇泥砾岩层以及注采井间钻遇泥砾岩层,研究泥砾岩层垂向渗透率及沿井筒展布范围对井位部署及开发指标的作用界限及影响规律。结果表明,在相同泥砾岩层渗透及展布特征条件下,注汽井钻遇泥砾岩层对蒸汽腔扩展的影响程度低于生产井钻遇和注采井间钻遇。若井筒或注采井间钻遇连续泥砾岩层长度达50m,需及时调整水平井筒后续钻进轨迹。对于不同展布范围的泥砾岩层,利用开发指标与垂向渗透率关系图版可指导长湖油砂区蒸汽辅助重力泄油(SAGD)的井位部署。
Breccia develops widely in the middle and lower part of reservoir in Longlake oil sand,Canada.Based on characteristics of permeability and extension of breccia in the target area,numerical simulation method was used to study the impact of vertical permeability of breccia and its extension along the wellbore on well pattern and development index.In this process,three different conditions were considered,including injector drilled in breccia,producer drilled in breccia and breccia between injector and producer.The results show that with the same permeability and extension,the impact of breccia drilled by injector on the expansion of steam chamber was smaller than that drilled by producer or between injector and producer.If the breccia was drilled into by well or it was located between injector and producer,the subsequent trajectory should be adjusted if continuous length of breccia was larger than 50 m.For breccia with different extension,the relationship chart between vertical permeability of breccia and development index could provide a guiding role for the design of SAGD well pattern.
作者
卢川
LU Chuan(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《科学技术与工程》
北大核心
2019年第29期103-108,共6页
Science Technology and Engineering
基金
国家科技重大专项(2016ZX05031003)资助
