微观孔隙结构参数对聚合物驱油效率的影响研究
发布时间：2019-01-10 13:52
【摘要】：随着油田水驱阶段含水率的升高,水驱开采的经济价值逐年降低,聚合物溶液驱油作为发展较快的三次采油技术可以有效的提高原油采收率。原油储层是非常复杂的多孔介质结构,微观孔隙结构和参数直接影响着聚合物驱油效率的高低。在微观孔隙尺度上对聚合物溶液在储层中的流动进行研究是揭示其流动机制的重要手段,明确微观孔隙结构参数对聚合物驱油效率的影响可以为聚合物溶液如何适应各类油层及如何提高驱油效率提供有效的理论依据。本文以天然岩心压汞实验得到的孔吼半径分布频率和CT扫描得到的配位数数据为依据,给出了基于自适应性的数字岩心构建方法,运用所构建数字岩心进行了不同区块天然岩心的渗透率计算并与真实值进行对比,验证了所构建数字岩心的正确性。运用阻力最小原则解决了孔隙内不同流体的流动变更,结合水电相似原理实现了水驱油、聚驱油的动态渗流模拟过程。分别研究了聚合物溶液粘弹性、不可及孔隙体积特性、吸附特性对聚合物驱油效率的影响。在考虑了聚合物粘弹性、不可及孔隙体积特性、吸附特性情况下,研究了不同微观孔隙结构参数对聚驱采收率提高值的影响,运用灰色关联理论分析了各个微观孔隙结构参数对聚驱驱油效率的影响大小。结果表明:考虑聚合物溶液的弹性特性情况下聚驱驱油效率值增大,并且随着弹性的增大,其聚合物溶液驱油效率增高;考虑聚合物溶液的不可及孔隙体积特性时的聚驱采收率提高值增大;聚合物溶液的吸附特性使聚驱采收率值变低,并且随着聚合物溶液相对分子质量和浓度的增加,其降低值呈增大趋势;随着孔喉半径、形状因子的增大,聚驱提高采收率值增大;随着配位数的增大,剩余油的形成机会减少,聚驱驱油效率值逐渐增大;随着孔喉比的增大、聚驱提高采收率值降低;随着水湿喉道比例的增加,聚驱的波及体积变大,驱油效率增高;其中配位数和喉道半径对聚驱采收率提高值影响较大,且配位数影响程度最高,形状因子和润湿性也属于重要影响参数,影响程度比配位数和喉道半径略小,孔喉比对聚驱采收率提高值的影响相对较低。
[Abstract]:With the increase of water cut in water flooding stage, the economic value of water drive production decreases year by year. Polymer solution flooding as a rapid development of tertiary oil recovery technology can effectively improve oil recovery. Crude oil reservoir is a very complex porous media structure. The micro pore structure and parameters directly affect the polymer flooding efficiency. The study on the flow of polymer solution in reservoir at the micropore scale is an important means to reveal the flow mechanism of polymer solution. The effect of microcosmic pore structure parameters on polymer flooding efficiency can provide an effective theoretical basis for how polymer solution adapts to various reservoirs and how to improve oil displacement efficiency. Based on the distribution frequency of roar radius obtained from mercury injection experiment in natural cores and the coordination number data obtained by CT scanning, a digital core construction method based on adaptive method is presented. The permeability of natural cores in different blocks is calculated by using the constructed digital cores and compared with the true values, which verifies the correctness of the constructed digital cores. The flow change of different fluids in pores is solved by using the principle of minimum resistance, and the dynamic seepage simulation process of water flooding and polymer flooding is realized by combining the principle of hydroelectricity similarity. The effects of viscoelasticity, unreachable pore volume and adsorption on polymer flooding efficiency were studied. Considering the viscoelasticity of polymer, the volume characteristics of unreachable pores and the adsorption characteristics, the effects of different micro-pore structure parameters on the enhanced recovery of polymer flooding are studied. The influence of micro-pore structure parameters on the oil displacement efficiency of polymer flooding is analyzed by using grey relation theory. The results show that the polymer flooding efficiency increases when the elasticity of polymer solution is taken into account, and the oil displacement efficiency increases with the increase of elasticity. Considering the unreachable pore volume characteristics of polymer solution, the increase value of polymer flooding recovery is increased. The adsorption characteristics of polymer solution make the value of polymer flooding oil recovery lower, and with the increase of relative molecular weight and concentration of polymer solution, the decreasing value of polymer solution tends to increase. With the increase of pore throat radius and shape factor, the enhanced oil recovery value of polymer flooding increases, and with the increase of coordination number, the formation opportunity of remaining oil decreases, and the efficiency value of polymer flooding increases gradually. With the increase of pore throat ratio, the oil recovery of polymer flooding decreases, the sweep volume of polymer flooding becomes larger and the oil displacement efficiency increases with the increase of water / wet throat ratio. Among them, the coordination number and throat radius have great influence on the enhanced recovery factor of polymer flooding, and the coordination number has the highest influence degree, and the shape factor and wettability are also important parameters, and the influence degree is slightly smaller than the coordination number and throat radius. The effect of pore throat ratio on oil recovery in polymer flooding is relatively low.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46
本文编号：2406391
[Abstract]:With the increase of water cut in water flooding stage, the economic value of water drive production decreases year by year. Polymer solution flooding as a rapid development of tertiary oil recovery technology can effectively improve oil recovery. Crude oil reservoir is a very complex porous media structure. The micro pore structure and parameters directly affect the polymer flooding efficiency. The study on the flow of polymer solution in reservoir at the micropore scale is an important means to reveal the flow mechanism of polymer solution. The effect of microcosmic pore structure parameters on polymer flooding efficiency can provide an effective theoretical basis for how polymer solution adapts to various reservoirs and how to improve oil displacement efficiency. Based on the distribution frequency of roar radius obtained from mercury injection experiment in natural cores and the coordination number data obtained by CT scanning, a digital core construction method based on adaptive method is presented. The permeability of natural cores in different blocks is calculated by using the constructed digital cores and compared with the true values, which verifies the correctness of the constructed digital cores. The flow change of different fluids in pores is solved by using the principle of minimum resistance, and the dynamic seepage simulation process of water flooding and polymer flooding is realized by combining the principle of hydroelectricity similarity. The effects of viscoelasticity, unreachable pore volume and adsorption on polymer flooding efficiency were studied. Considering the viscoelasticity of polymer, the volume characteristics of unreachable pores and the adsorption characteristics, the effects of different micro-pore structure parameters on the enhanced recovery of polymer flooding are studied. The influence of micro-pore structure parameters on the oil displacement efficiency of polymer flooding is analyzed by using grey relation theory. The results show that the polymer flooding efficiency increases when the elasticity of polymer solution is taken into account, and the oil displacement efficiency increases with the increase of elasticity. Considering the unreachable pore volume characteristics of polymer solution, the increase value of polymer flooding recovery is increased. The adsorption characteristics of polymer solution make the value of polymer flooding oil recovery lower, and with the increase of relative molecular weight and concentration of polymer solution, the decreasing value of polymer solution tends to increase. With the increase of pore throat radius and shape factor, the enhanced oil recovery value of polymer flooding increases, and with the increase of coordination number, the formation opportunity of remaining oil decreases, and the efficiency value of polymer flooding increases gradually. With the increase of pore throat ratio, the oil recovery of polymer flooding decreases, the sweep volume of polymer flooding becomes larger and the oil displacement efficiency increases with the increase of water / wet throat ratio. Among them, the coordination number and throat radius have great influence on the enhanced recovery factor of polymer flooding, and the coordination number has the highest influence degree, and the shape factor and wettability are also important parameters, and the influence degree is slightly smaller than the coordination number and throat radius. The effect of pore throat ratio on oil recovery in polymer flooding is relatively low.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46
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