摘要
海上窄河道油藏经过多年的注水开发,注水井的水驱方向复杂。为了解井间的注采连通性和非均质性,以G1井组为例,开展示踪剂监测技术的研究。对示踪剂用量和注入工艺进行设计,通过监测示踪剂产出量,对Gl井组的高渗通道进行定性分析。结果表明:G1井组油水井间对应关系不均衡,注水井平面上的前缘水线推进速度存在着较大差异,因长期注水冲刷,油层内部有高渗带和大孔道存在,且比较发育,大孔道孔喉半径最高接近20pm。在窄河道油藏注水开发过程中需要注意大孔道的存在及其对存水率的影响。
After years’water-flooding extraction in offshore narrow channel reservoir,the water drived direction between injectors and producers becomes complex.Inter-well tracer monitoring test was carried out in G1 well group to understand water injection connectivity and heterogeneity between wells,the amount of tracer and injection process were designed.Through monitoring the tracer output,qualitative analysis on high seepage channel of G1 well group can be carried out.The results showed that the corresponding relationship between the injectors and producers of G1 well group was not balanced.There was a big difference in the advancing rate of the leading edge waterline on the plane of the main water-absorbing layer.Due to the long-term water injection,the max pore throat radius of the water-flooded oil layer in the well area was close to 20pm,and the oil layer has a high permeability layer and large pores exist and were relatively developed.In the process of water injection and development of narrow channel reservoir,attention should be paid to the existence of large pores and the influence on the water retention rate.
作者
王凤刚
刘艳涛
张震
李瑞雪
赵云斌
WANG Feng-gang;LIU Yan-tao;ZHANG Zhen;LI Rui-xue;ZHAO Yun-bin(CNOOC Energy Technology&Services-Engineering&Technology Services Co.,Tianjin 300452,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)
出处
《精细与专用化学品》
CAS
2021年第12期19-21,50,共4页
Fine and Specialty Chemicals
关键词
示踪剂监测
注采井组
窄河道油藏
高渗透层
非均质性
tracer monitoring
injection and production well group
narrow channel reservoir
high permeability layer
heterogeneity
