高凝油田不同驱替温度下孔渗变化规律及对相渗曲线特征参数的影响

The Relationship of Permeability and Porosity at Different Flooding Temperature and Its Impact on the Typical Parameters of Relative Permeability Curves

高凝油藏(原油凝固点在40℃以上,含蜡量高的油藏)在开采过程中,由于黏度增加、析蜡等现象,将使得储层流动性变差,影响开发效果,但目前国内外针对高凝油的流变性及驱替过程中的储层物性变化规律的定性研究较少。根据海外某高凝油田A的流变性试验和驱替试验结果,分析了高凝油随温度降低所产生的黏度增加以及蜡的析出对孔隙度、渗透率和驱替效果的影响。重点分析了黏度、孔隙度、渗透率随温度变化的规律,并提出一项新的、可同时表征储层物性与流体性质的储层特征参数γ。分析了不同温度、不同γ下的相渗参数及相关关系。研究结果对类似高凝油田开发具有一定的参考意义。

During the exploitation process of high pour point reservoir （pour point ＞ 40 ℃,high wax content）,the viscosity rise and the wax precipitate,which will affect the development result.However,up to now,there are few results of this kind of core flooding tests.The change of viscosity,porosity and permeability because of the temperature decreasing and wax precipitation during the core flooding tests of high pour-point oil field A were analyzed.Based on the results of the tests,the correlation law of viscosity,porosity,permeability and temperature were found.A new reservoir characteristic parameter γ was also put forward to help analyze the correlation law of T,γ and oil-water relative permeability parameters.The results provided a reference for the development of similar high pour-point oil field.