Gas flooding such as CO2 flooding may be effectively applied to ultra-low permeability reservoirs, but gas channeling is inevitable due to low viscosity and high mobility of gas and formation heterogeneity. In order t...Gas flooding such as CO2 flooding may be effectively applied to ultra-low permeability reservoirs, but gas channeling is inevitable due to low viscosity and high mobility of gas and formation heterogeneity. In order to mitigate or prevent gas channeling, ethylenediamine is chosen for permeability profile control. The reaction mechanism of ethylenediamine with CO2, injection performance, swept volume, and enhanced oil recovery were systematically evaluated. The reaction product of ethylenediamine and CO2 was a white solid or a light yellow viscous liquid, which would mitigate or prevent gas channeling. Also, ethylenediamine could be easily injected into ultra-low permeability cores at high temperature with protective ethanol slugs. The core was swept by injection of 0.3 PV ethylenediamine. Oil displacement tests performed on heterogeneous models with closed fractures, oil recovery was significantly enhanced with injection of ethylenediamine. Experimental results showed that using ethylenediamine to plug high permeability layers would provide a new research idea for the gas injection in fractured, heterogeneous and ultra-low permeability reservoirs. This technology has the potential to be widely applied in oilfields.展开更多
以乙二胺为主剂，硼酸、磷酸、柠檬酸和硫酸为添加剂，配制乙二胺类烟气吸收剂，测定其对SO2吸收容量和脱除效率的影响。结果显示，乙二胺／硼酸对SO2吸收容量为450mg／L，脱硫率达97％；同时研究乙二胺／硼酸溶液10次吸收一解吸循环过...以乙二胺为主剂，硼酸、磷酸、柠檬酸和硫酸为添加剂，配制乙二胺类烟气吸收剂，测定其对SO2吸收容量和脱除效率的影响。结果显示，乙二胺／硼酸对SO2吸收容量为450mg／L，脱硫率达97％；同时研究乙二胺／硼酸溶液10次吸收一解吸循环过程。数据表明，SO2的脱除效率达99％，解吸后pH稳定在6．10-23；选择乙二胺／硼酸为最佳脱硫剂，在鼓泡反应器中对湿法烟气脱硫（wetflue gas desulphurization，WFGD）工艺进行研究。通过改变吸收剂温度、乙二胺浓度、吸收剂pH和SO2进口浓度，探讨其对脱硫率的影响。确定吸收SO2适宜的工艺条件：吸收剂温度30℃，乙二胺浓度0．3mol／L，吸收剂pH为8．5。结果显示，实验范围内，烟气中SO2浓度越大，脱硫率越高。展开更多
基金Financial support for this work from National Sciencetechnology Support Plan Projects (No. 2012BAC26B00)the Science Foundation of China University of Petroleum, Beijing (No.2462012KYJJ23)
文摘Gas flooding such as CO2 flooding may be effectively applied to ultra-low permeability reservoirs, but gas channeling is inevitable due to low viscosity and high mobility of gas and formation heterogeneity. In order to mitigate or prevent gas channeling, ethylenediamine is chosen for permeability profile control. The reaction mechanism of ethylenediamine with CO2, injection performance, swept volume, and enhanced oil recovery were systematically evaluated. The reaction product of ethylenediamine and CO2 was a white solid or a light yellow viscous liquid, which would mitigate or prevent gas channeling. Also, ethylenediamine could be easily injected into ultra-low permeability cores at high temperature with protective ethanol slugs. The core was swept by injection of 0.3 PV ethylenediamine. Oil displacement tests performed on heterogeneous models with closed fractures, oil recovery was significantly enhanced with injection of ethylenediamine. Experimental results showed that using ethylenediamine to plug high permeability layers would provide a new research idea for the gas injection in fractured, heterogeneous and ultra-low permeability reservoirs. This technology has the potential to be widely applied in oilfields.
文摘以乙二胺为主剂，硼酸、磷酸、柠檬酸和硫酸为添加剂，配制乙二胺类烟气吸收剂，测定其对SO2吸收容量和脱除效率的影响。结果显示，乙二胺／硼酸对SO2吸收容量为450mg／L，脱硫率达97％；同时研究乙二胺／硼酸溶液10次吸收一解吸循环过程。数据表明，SO2的脱除效率达99％，解吸后pH稳定在6．10-23；选择乙二胺／硼酸为最佳脱硫剂，在鼓泡反应器中对湿法烟气脱硫（wetflue gas desulphurization，WFGD）工艺进行研究。通过改变吸收剂温度、乙二胺浓度、吸收剂pH和SO2进口浓度，探讨其对脱硫率的影响。确定吸收SO2适宜的工艺条件：吸收剂温度30℃，乙二胺浓度0．3mol／L，吸收剂pH为8．5。结果显示，实验范围内，烟气中SO2浓度越大，脱硫率越高。
