深层稠油热水添加N2泡沫段塞驱开采可行性研究

针对深层稠油油藏，利用热采物理模拟技术，研究了热水添加N2泡沫段塞驱提高采收率的可行性。研究结果表明：热水中加入N2泡沫剂驱替时，能有效地提高驱油效率；泡沫液膜的高剪切可使原来吸附在岩石表面的油膜剥蚀下来，降低残余油饱和度；泡沫剂及N2段塞驱替时，泡沫流动产生的高压力梯度，既可以克服毛细管力作用，又可以迫使注入水转向，提高波及体积。该种开发方式为那些埋藏较深，既不适合注蒸汽，也不适合采用常规水驱的稠油油藏的开发提供了一定的借鉴。

Feasibility of recovery deep heavy oil by hot water plus N2 foam slug

The feasibility of improving recovery factor of deep heavy oil reservoir by hot water plus N_2 foam slug is studied by using physical modeling for thermal recovery. The result shows that, when N_2 foam agent is added in hot water, oil displacement efficiency can be improved. The high shear of foam liquid film can strip oil film adsorbed on rock surface and reduce residual oil saturation. The high pressure gradient resulted from foam flow can put up with capillary pressure and force the injected water to change direction so as to improve swept volume. This development method provides a reference to those heavy oil reservoirs which are not suitable to steam injection and conventional water drive.