文东油田深层高压低渗透油藏渗流特征及机理研究

以中原文东油田深层高压低渗透储层为研究对象,通过岩心实验分析孔隙度、渗透率与应力敏感效应的变化关系,并测定渗透率与启动压力梯度之间的变化关系。实验和模拟结果表明,深层高压低渗透储层孔隙度、渗透率与应力敏感效应成幂函数变化,当渗透率在5×10-3μm2以下时存在明显的启动压力梯度,且随着渗透率减小,启动压力梯度急剧增大;启动压力梯度对产量呈线性影响,而应力敏感效应对产量呈指数影响,且比启动压力梯度对产能影响更大。

Seepage characteristics and mechanism study of deepburied,high-pressure and low-permeability oil reservoirs in Wendong oilfield

Deep-buried,high pressure and low permeability reservoirs of Wendong oilfield have been taken as the research object.Through core experiment analysis of the change relationship between porosity,permeability and the stress sensitive effect,the change relationship between the permeability and starting pressure gradient has been determined.Experiments and simulation results show the porosity,permeability and stress sensitive effect should be changed as a power function.When the permeability is under 5 x 10-3μm2,there is an obvious start-up pressure gradient.With decreases of the permeability,the start-up pressure gradient increases sharply.The start-up pressure gradient has a linear influence on yield and the stress sensitive has an index effect on yield,which has a greater effect on capacity than that of start-up pressure gradient effect.