低渗透裂缝性油藏压力特征及调整对策

Pressure characteristics and adjustment countermeasures in low permeability fractured reservoir

由于陇东油藏具有储层物性差,渗透率特低,存在微裂缝的特点,加上启动压力梯度的影响,使得开发过程中的渗流阻力大、压力传导能力低,且通常需要采用压裂的方式投产。以西峰油田白马南区为代表,描述低渗透油藏渗流规律的连续数学模型为基础,系统分析了低渗透油藏压裂后注采井间的渗流特点、压力及压力梯度变化规律,进而得到了相应的调整对策。对特低渗裂缝性油藏有效驱替压力系统的建立与合理开发具有重要的意义。

Due to the characteristics of Longdong reservoir which are bad reservoir property, low permeability and natural and in- duced fractures along with the influence of threshold pressure gradient, filtration resistance is heavy and pressure transmission ca- pacity is low in the process of development, and before production there always need fracture as well. Taking north Baima area of Xifeng oilfield as an example, and based on the continuous mathematicaI models which descrie the seepage rule in low permeabili- ty reservoir, this paper analyzed the seepage characteristics and change rules of pressure and pressure gradient between injection and production fractured wells and got the corresponding adjustment countermeasures. The research achievements has great signifi- cance for the establishment and reasonable development of the effective displacement pressure system of extremely low permeabili- ty fractured reservoir.