孤东油田七区西相对渗透率曲线研究

油水相对渗透率曲线综合反映了互不相溶的油水两相在不同含水饱和度下渗流规律的变化，是油田开发设计中产能预测的基础资料；而不同开采阶段取心岩样相渗曲线的变化,能够反映储集层结构的变化，研究这一变化可为油田剩余油挖潜提供理论依据。孤东油田七区西馆陶组上段取心井资料表明，随着水驱过程的深入，油水相对渗透率曲线的特征值发生了变化，束缚水饱和度和残余油饱和度减小、等渗点含水饱和度及残余油饱和度下的水相渗透率增大，反映出油层孔隙度增大、黏土矿物减少、孔隙比表面积减少、孔隙表面更亲水以及水驱结束后储集层的综合渗流能力有所增加等特征。不同阶段相渗参数分析表明，油田进入高含水期后，孔隙度对渗透率、渗透率对残余油饱和度、两相共渗区、驱油效率等参数的影响作用相对增大。研究结果认为，该油田三次采油应立足于改善储集层结构和驱油剖面，减少孔间矛盾，提高驱油效率。

A study on the relative permeability curves of the west area of Block 7 in Gudong oil field

The relative permeability curve reflects the flowing law of oil and water under different water saturation, which is the basic data of productivity predicting in the development designing. On the other hand, the changes of eigenvalue of the relative permeability curves could reflect the changes of pore structure, which is useful for taking effective measures to tap the remaining oil. According to the results of analysis of the characteristics of the different water drive stages relative permeability curves of the west area of Block 7 in Gudong oil field,the porestructure and fluid flowing features of the reservoir have changed through long term flooding. These changes, such as irreducible water saturation and residual oil saturation decreasing, the water saturation of equal permeability point and water relative permeability under residual oil saturation increasing, reflect that the reservoir porosity enlarged, clay mineral and specific surface area of pore reduced, and the surface of pore is more hydrophilous. Analysis of relative permeability parameters indicates that influences of porosity to permeability and permeability to residual oil saturation and the oil displacement efficiency have been enhanced relatively. Study results provide theoretic dependency for tertiary recovery measures that are established in improving pore structure and oil displacement profile and reducing contradiction between pores.