深薄层砂砾岩特稠油油藏蒸汽吞吐转驱试验评价

Steam Soak Transfer to Steamflood Evaluation of Deep Thin Glutenite Extra-viscous Oil Reservoir

L油田为一大型的埋深、薄层、特稠油构造地层油藏 ,在其东区C块对 2种井距进行了蒸汽吞吐转驱试验。结果表明 ,埋深 90 0m以下 ,厚度 10m左右的砂砾岩储层 ,在 7MPa左右较高压力下转驱仍然是可行的。采用先进的注采及监测配套工艺 ,使注汽井井底干度始终保持在 70 %以上 ,采注比 1 4以上 ,预测最终采收率比一直保持吞吐方式提高 2

L Oilfield is a large deep buried thin layer extra-viscous oil structural-stratigraphic reservoir. A test of steam soak transfer to steamflood is carried out on two well spacing of Block C in the east of the oilfield. The result shows that the steamflood is still feasible at high pressure of about 7 MPa in a 10 meter thick glutenite reservoir below the buried depth of 900 m , by using the advanced injection-production and detection techniques, more than 70% steam quality fraction is always maintained at bottomhole, more than 1.4 injection-production ratio is kept and predicted ultimate recovery factor is raised as 28% higher than that of consistent steam soak.