Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industria...Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industrialization production. It has played a very important role in maintaining the oilfield stable production of over 50 million tons of oil. But the high permeability variation is serious, resulting in polymer production in some production wells recylingly and production concentration increasing slowly, which adversely affects polymer flooding efficiency. Chlloid dispersion gels (CDG) is a unique in - depth permeability modification process. It can reduce in - depth reservoir permeability variation by moving into highly permeable, water saturated zones and providing high resistance to subsequent water injection in those zones, so that oil can be produced from tighter rock. So CDG can enlarge volumetric sweep, and improve oil recovery efficiency. We had a CDG pilot programme in Daqing Oil Field in 1999, now this pilot has been entering into effective period with produing more oil and less water.展开更多
acuum residuum is mixed with FCC slurry oil and the mechanism of residuum modification FCC slurry oil is studied.In the course of mixed residuum with FCC slurry oil,there are two competitive processes of solution and ...acuum residuum is mixed with FCC slurry oil and the mechanism of residuum modification FCC slurry oil is studied.In the course of mixed residuum with FCC slurry oil,there are two competitive processes of solution and adsorption.The solution process means that some components with similar structure and solubility parameter from FCC slurry oil and residuum will dissolve in each other and small molecules will be freed from the surface of big molecules;The adsorption process means that asphaltene adsorbs molecules with polarity similar to and some molecules with similar surface structure adsorb on each other with small particles aggregating into big ones.The process of solution is balance with process of adsorption.When the ratio of FCC slurry oil is lower;while the process of adsorption predominates,when the ratio of FCC slurry oil is higher.The combination of the two competitive processes changes the composition and compatibility of residuum colloidal system,which leads to the decrease of solvent power and stability of residuum.The properties of mixed residuum that change with temperature should be further studied.展开更多
文摘Daqing Oilfield has carried out the production of polymer flooding was promoted since in 1996. Presently, polymer flooding is very successful in several production plants of Daqing Oilfield, and getting into industrialization production. It has played a very important role in maintaining the oilfield stable production of over 50 million tons of oil. But the high permeability variation is serious, resulting in polymer production in some production wells recylingly and production concentration increasing slowly, which adversely affects polymer flooding efficiency. Chlloid dispersion gels (CDG) is a unique in - depth permeability modification process. It can reduce in - depth reservoir permeability variation by moving into highly permeable, water saturated zones and providing high resistance to subsequent water injection in those zones, so that oil can be produced from tighter rock. So CDG can enlarge volumetric sweep, and improve oil recovery efficiency. We had a CDG pilot programme in Daqing Oil Field in 1999, now this pilot has been entering into effective period with produing more oil and less water.
文摘acuum residuum is mixed with FCC slurry oil and the mechanism of residuum modification FCC slurry oil is studied.In the course of mixed residuum with FCC slurry oil,there are two competitive processes of solution and adsorption.The solution process means that some components with similar structure and solubility parameter from FCC slurry oil and residuum will dissolve in each other and small molecules will be freed from the surface of big molecules;The adsorption process means that asphaltene adsorbs molecules with polarity similar to and some molecules with similar surface structure adsorb on each other with small particles aggregating into big ones.The process of solution is balance with process of adsorption.When the ratio of FCC slurry oil is lower;while the process of adsorption predominates,when the ratio of FCC slurry oil is higher.The combination of the two competitive processes changes the composition and compatibility of residuum colloidal system,which leads to the decrease of solvent power and stability of residuum.The properties of mixed residuum that change with temperature should be further studied.
