特低渗透油藏CO2驱油多相渗流理论模型研究及应用

根据一系列实验成果,对特低渗透油藏CO₂驱油渗流数学描述进行了理论研究,建立了特低渗透油藏CO₂驱油渗流数学模型。该模型能反映特低渗透储层CO₂混相和非混相驱油过程中油和CO₂的混相作用以及水、油、溶剂(CO₂)的相互作用与传输、质量的相互转换,包括对流扩散、质量转换和气、液间的转换,并能反映各相流体的非达西渗流、相对渗透率及有效黏度等特性。运用该模型在扶杨油层进行了注CO₂开发试验,取得了较好效果。

Study on mathematical models for multi-phase porous flow in CO2 drive of extra-low permeability reservoir and field application

The variation of multi-phase porous flow in CO2 drive of extra-low permeability reservoir was studied on the basis of the experiment results of porous flow mechanism and property. A series of mathematical models for describing the parameters of CO2 drive were established on the basis of porous flow mechanism, phase behavior, convection, difuction, non-Darcy flow, transform dynamics and fluid mechanics. The theoretical models can express the physical properties such as mixed phase of oil and CO2, interaction and conversion of water, oil and CO2, mass transformation of gas and fluid. Those models were applied in the extra-low permeability oilfield of CO2 drive reservoir of Fuyang Oilfield, and good results have been achieved.