低渗油藏渗流特征及开发对策研究:以渤海湾盆地黄骅坳陷M油藏为例

Low permeability reservoirs flow characteristics and development strategies:a case study on M reservoir in Huanghua Depression,Bohai Bay Basin

注入压力高、吸水能力下降快是低渗油藏注水开发面临的难题。通过分析深层低渗油藏压敏、水敏、油水黏度比、相渗等因素对渗流特征的影响,获得油藏开发过程中储层物性及流体渗流变化规律;利用油藏工程原理及数值模拟技术,研究了裂缝方位、注入量、渗透率及注水时机对裂缝扩张注水效果的影响,证明裂缝扩展注水技术能够大幅度提高低渗油藏采出程度。研究成果对改善低渗油藏注水开发效果具有重要指导意义。

High injection pressure and fast decreasing water injectivity are two challenges during water flooding development in low permeability reservoirs.The variations of petrophysical properties and fluids flow during the reservoir development are acquired through deeply analysis on the effects of factors such as pressure sensitivity, water sensitivity, oil-water viscosity ratio, relative permeability on flow characteristics.By applying principles of reservoir engineering and reservoir simulation techniques,the influences of fracture azimuth,injection rate,permeability and water injection timing on fracture propagation under water flooding are studied.It is proved that fracture propagation water flooding technique is capable of largely increasing oil recovery in low permeability reservoirs.The results show instructive significance on reservoir development improvements under water flooding in low permeability reservoirs.