蒸汽吞吐汽窜调剖参数优化设计研究

Optimization design of profile control parameters for steam stimulation wells

对稠油油藏蒸汽吞吐的汽窜动态和汽窜方式进行了分析,根据汽窜通道内的蒸汽凝析特征,建立了窜流通道内的蒸汽驱非活塞驱替模型。并根据窜通井对应射孔段的油层物性差异,建立了井间平均连通程度和窜通角计算方法。利用该方法计算出井间窜汽量,然后由非活塞式驱替模型、注汽动态资料和窜通时间确定了井间窜通孔隙体积。注蒸汽油藏数值模拟研究表明,调剖段塞处于井间中部时,调剖效果较好;初次调剖段塞比率为10%-15%时,蒸汽波及系数达到最大。对L1833井进行了调剖参数设计,按照深部调剖原则选取堵剂颗粒粒径,调剖剂用量为32m3。实施调剖后注汽,邻井的汽窜通道得到了封堵,堵调效果较好。

The steam breakthrough performance and mode of steam stimulation in heavy oil reservoir were analyzed. A non-piston steam displacement model was build on the basis of steam condensation features in the steam stimulation wells. The rate of the directional steam flow can be obtained by calculation of inter-well formation connection degree and breakthrough angle. Then the steam sweep volume and porous size can be also determined. The numerical simulation of steaming reservoir showed that the maximum steam sweep efficiency was obtained when the profile control agent slug was at a half inter-well distance, and the slug ratio of the steam sweep pores was 10% to 15%. The profile slug agent of 32 m3 in volume and proper diameter of grain was used to design the profile control parameters of L1833 Well. The steam breakthrough around production wells disappeared after field application of profile control. Good result has been achieved.