sweep efficiency

In order to better recover the by-passed oil in reservoirs, EOR technologies that can improve both sweep efficiency and flushing efficiency are needed.

要想较好地挖掘层内剩余油，就必须有既提高波及系数，也有提高洗油效率的提高原油采收率的技术。

It has the characteristics of low polymer and crosslinker concentration, inexpensive charge and controllable gelling time, so it is suitable for large volume treatment to improve the volumetric sweep efficiency of water, modify the water profile and enhance the recovery ratio.

因此，它比较适合大剂量注入，有望进行深部处理，提高注入水的体积波及系数，改善吸水剖面，从而达到提高采收率的目的。

Research on sweep efficiency in horizontal-vertical combined well pattern

水平井与垂直井联合井网波及系数研究

The mechanism and the extent of action of polymer solution's depleted layer effect and viscoelastic effect on displacement efficiency and sweep coefficient are studied through the displacement tests of polymer solutions in various models.

通过聚合物溶液在不同模型中的驱油实验，研究了聚合物溶液的衰竭层效应和粘弹性效应对驱油效率和波及系数的作用机理和作用程度。

The evident anisotropism is the main reason of low sweep efficiency and water displacement efficiency.

而较强的微观孔隙结构非均质性，是造成注入水波及效率不高、水驱油效率较低的主要原因。

Thermal method can enhance displacement efficiency for high water-cut oil reservoir, but can not increase sweep efficiency in most of the cases;

热力法开采高含水油藏能提高驱油效率，但一般不能提高波及效率；

The existence of interlayer is very favorable to dilate vertical swept volume and efficiency of water drive for the positive rhythm and block rhythm reservoirs, but it is unfavorable to enhance the sweep efficiency in the reverse rhythm reservoir.

隔夹层的存在有利于正韵律和块状韵律油层扩大纵向波及体积和驱油效率，不利于提高反韵律油层的注水波及效率。

A model for the calculation of the sweep efficiency in a heterogeneous oil reservoir

驱油效率和体积波及系数的确定非均质油层波及系数计算模型

By physical modeling and numerical simulation, the characters of horizontal fracturing-assisted steam flooding technology and oil incremental mechanism is summarized, that is, using horizontal fracture to control the steam overlaying rate and delay the steam breakthrough time can be effectively enhance the vertical sweep efficiency.

通过物理模拟和数值模拟，总结出水平压裂辅助蒸汽驱技术特点和增油机理，即利用水平裂缝控制蒸汽超覆速度、推迟蒸汽突破时间，有效提高了纵向波及系数。