渗吸采油是(弱)亲水致密油藏高效开发的重要技术措施之一,渗吸采油物理模拟是优选渗吸液配方组成和优化渗吸液段塞组合的重要实验手段。针对大庆外围地区致密油藏开发技术需求,以高分子材料学、物理化学和油藏工程等理论为指导,以化学...渗吸采油是(弱)亲水致密油藏高效开发的重要技术措施之一,渗吸采油物理模拟是优选渗吸液配方组成和优化渗吸液段塞组合的重要实验手段。针对大庆外围地区致密油藏开发技术需求,以高分子材料学、物理化学和油藏工程等理论为指导,以化学分析、仪器检测和物理模拟等技术为手段,以大庆外围扶余储层地质特征和流体性质为模拟研究对象,开展了动态渗吸采油效果及其影响因素实验研究。结果表明:在渗吸采油实验中,随注液压力升高,渗吸采收率增加;随注液速度增大,渗吸采收率增幅呈现出"先增后减"变化趋势;随渗吸液注入段塞尺寸增加、憋压时间延长和交替注入次数增加,渗吸采收率增加,但增幅逐渐减小。动态渗吸采油实验最优参数推荐:注液速度为0.2 m L/min、段塞尺寸为0.3 PV、憋压时间>96 h和交替注入次数为3。与单独注渗吸液或增能剂措施相比较,采取"渗吸液+增能剂"组合方式可以产生协同效应,增强孔隙内油水交渗作用,提高渗吸采油效果。展开更多
Steam channeling is one of the main barriers for EOR after steam flooding.In order to enhance the oil recovery in steam flooded reservoirs,steam channel volumes should be precisely known.In this paper,a set of methods...Steam channeling is one of the main barriers for EOR after steam flooding.In order to enhance the oil recovery in steam flooded reservoirs,steam channel volumes should be precisely known.In this paper,a set of methods has been established in order to study steam channeling quantitatively by using dynamic data.Firstly,steam channeling wells are identified through curves of watercut and temperature.Then,considering the hysteresis phenomenon,channeling relations are identified with the correlation coefficients between injection wells and production wells under different conditions.Lastly,an analytic model,in which steam condensation,pressure and temperature are considered,is established to calculate the steam channel volumes.A production well named L31615 in some block in Henan Oilfield in China is systematically analyzed by using the method established.The whole block is further analyzed,and the distribution map of steam channels and the steam channel volumes are obtained.The results show that steam channeling does not only occur inside a well group,but also sometimes occurs between wells in different well groups.The calculation of the steam channel volumes provides a theoretical basis for bringing a remedial action like plugging into operation.展开更多
文摘渗吸采油是(弱)亲水致密油藏高效开发的重要技术措施之一,渗吸采油物理模拟是优选渗吸液配方组成和优化渗吸液段塞组合的重要实验手段。针对大庆外围地区致密油藏开发技术需求,以高分子材料学、物理化学和油藏工程等理论为指导,以化学分析、仪器检测和物理模拟等技术为手段,以大庆外围扶余储层地质特征和流体性质为模拟研究对象,开展了动态渗吸采油效果及其影响因素实验研究。结果表明:在渗吸采油实验中,随注液压力升高,渗吸采收率增加;随注液速度增大,渗吸采收率增幅呈现出"先增后减"变化趋势;随渗吸液注入段塞尺寸增加、憋压时间延长和交替注入次数增加,渗吸采收率增加,但增幅逐渐减小。动态渗吸采油实验最优参数推荐:注液速度为0.2 m L/min、段塞尺寸为0.3 PV、憋压时间>96 h和交替注入次数为3。与单独注渗吸液或增能剂措施相比较,采取"渗吸液+增能剂"组合方式可以产生协同效应,增强孔隙内油水交渗作用,提高渗吸采油效果。
基金supported by China National Science and Technology Major Project(Grant No.2011ZX05009-004-05)the National Natural Science Foundation of China(Grant No.51274212)
文摘Steam channeling is one of the main barriers for EOR after steam flooding.In order to enhance the oil recovery in steam flooded reservoirs,steam channel volumes should be precisely known.In this paper,a set of methods has been established in order to study steam channeling quantitatively by using dynamic data.Firstly,steam channeling wells are identified through curves of watercut and temperature.Then,considering the hysteresis phenomenon,channeling relations are identified with the correlation coefficients between injection wells and production wells under different conditions.Lastly,an analytic model,in which steam condensation,pressure and temperature are considered,is established to calculate the steam channel volumes.A production well named L31615 in some block in Henan Oilfield in China is systematically analyzed by using the method established.The whole block is further analyzed,and the distribution map of steam channels and the steam channel volumes are obtained.The results show that steam channeling does not only occur inside a well group,but also sometimes occurs between wells in different well groups.The calculation of the steam channel volumes provides a theoretical basis for bringing a remedial action like plugging into operation.
