低渗层重复压裂的油藏数值模拟研究

采用黑油模型，研究了在低渗地层的五点注采井网中，不同储集层渗透率和油井不同含水率下，重复压裂的裂缝穿透率和导流能力等对采油动态的影响。研究表明，重复压裂的效果在很大程度上取决于复有原有裂缝和地层的认识上，对具有一定可采储量地层重复压裂时，如果集集层的渗透性较差，应以增加裂缝的穿透率为主，若储集层的渗透性较好，则应主要增加裂缝的导流能力；无因次裂缝导流能力是影响复压生生产动态的一项实质性因素。

NUMERICAL RESERVOIR SIMULATION FOR REFRACTURING LOW PERMEABLE FORMATIONS

In this paper, black-oil model is used to study how fracture penetration and fracture conductivity affect the oil recovery per-formance for different formation permeabilities and water-cuts in production wells during re fracturing low permeability formations. The study shows that results of refracturing depend largely on the understanding to the old fractures and formations.When refracturing the formations with certain recoverable reserve, refracturing design should be focused on increasing fracture penetration for the low permeable formations and increasing the fracture conductivity for the high permeable ones. Infact, the dimensionless fracture conductivity is the essential factor that affects the recovery performance after refracturing.