【作者】 李奋；

【导师】 李爱芬； 王建；

【作者基本信息】 中国石油大学 ， 石油与天然气工程， 2009， 硕士

【摘要】 注水开发是世界主要产油国开发油田的主要方式,也是迄今为止最经济有效的提高采收率的方法。而水驱波及系数和驱油效率是油田开发中必不可少的参数,但是近年来密闭取心井资料反映出,油层纵向驱油效率及波及系数存在很大差异,目前已有的驱油效率计算方法均无法描述这种差异,因此有必要开展深入的研究。论文通过采用大量试验数据统计分析与论证试验相结合的的方法,以室内实验为主要研究手段,以实验数据为基础,研究内容为建立了中高渗砂岩油藏的渗透率、油水粘度比、岩石表面性质、孔隙结构、注入倍数与水驱油效率之间的关系;综合考虑单因素的影响建立了驱油效率预测模型;并应用大尺寸物理模型进行了动态波及系数的研究。研究结果表明,不同油水粘度比条件下储层渗透率和孔隙度与驱油效率呈现正相关关系;中性润湿较亲水样品驱油效率高1.63%,亲水样品较亲油样品驱油效率高2.47%;特征结构系数与驱油效率呈现正相关关系;不同油水粘度比下的注入倍数的对数与驱油效率呈现正相关关系。对建立的驱油效率预测数学模型进行试算,试算结果与试验结果的误差值为1.8~5.1%,相对误差为2~9%。应用参数可控性高、物理化学稳定性好的大尺寸人造物理模型开展的波及规律研究,建立了均质模型与非均质模型动态波及系数的描述方法。随着中高渗砂岩油藏高含水期开发力度及难度的逐渐增加,对剩余油分布的认识及机理研究日趋紧迫,该成果为重新评价胜利水驱油藏的潜力及剩余油挖潜提供理论根据。更多还原

【Abstract】 Waterflooding is not only a dominant producing method in the world oil industry, but also the most economical and efficient method to enhance oil recovery so far. Waterflooding sweep factor and displacement efficiency are indispensable parameters and final determinative factors in field development process. In recent years, sealed coring well data has demonstrated that there are great differences between vertical displacement efficiency and sweep factor in the reservoir. Because such differences can’t be described by current method computing displacement efficiency, it is necessary to make in depth study.By means of statistical and analysis method for extensive test data companied with demonstration testing, using laboratory experiment as main study means , the correlations between different single factor including permeability , viscosity ratio of oil and water, rock surface properties, pore structure , total injection volume and displacement efficiency were developed respectively based on experiment data. Considering comprehensively the effect of single factor, the forecasting model for displacement efficiency was developed. Using large scale physical model, dynamic conformance factor was also studied.The studying results show that the positive correlation exists between permeability or porosity and displacement efficiency for varied oil/water viscosity ratio, the displacement efficiency of intermediately wet core is 1.63% higher than of water wet core and the displacement efficiency of water wet core is 2.47% higher than of oil wet core, the positive correlation presents between pore character parameters and displacement efficiency, the positive correlation exists between total injection volume and displacement efficiency or total injection volume for varied oil/water viscosity ratio. Trial calculation of developed mathematical model for displacement efficiency indicates that the error value between calculated result and tested results is 1.8% to 5.1%, and the relative error is 2% to 9%. By means of large scale physical model with well parameter controllability and physicochemical stability, sweep feature was studied and a method used to describing dynamic sweep factor for homogeneous and nonhomogeneous model was developed.With gradually increasing development intensities and difficulties in high water cut stage sandstone reservoir with medium or high permeability, determining the residual oil distribution is becoming more and more urgent , so all the research results can supply theoretical references for re-evaluating waterflooding reservoir’s potential reserves and producing more residual oil.更多还原