chemical flooding EOR

Since the 1980s, the U.S. chemical flooding peaked after nearly 20 years, the use of chemical flooding in the United States less and less, but in China has been successfully applied. Briquette machine flooding technology has been representing the world's advanced level. China polymer flooding technology in 1996 to form industrial application. "Fifth" period Daqing Oilfield formed a benzene sulfonate-based agent of the "base + polymer + surfactant" compound flooding technology, Shengli Oilfield forming "polymer + surfactant" alkali-free compound flooding technology. At present, carry out the "base + polymer + surfactant + gas" bubble flooding laboratory study and field trials. Chemical flooding currently exist three different research directions. First, to improve the water mobility ratio departure, except that crude oil expeller reduction, the appropriate approach is to increase the viscosity of displacing agent, reducing its mobility, application of this principle has developed a polymer solution, foam fluid, flooding method. Secondly, to improve the capabilities and EOR washing wet rocks without profit departure, the development of active water flooding
France. Thirdly, that is between the first two between the chemical flooding method, called alkaline water flooding, the use of alkaline water and crude oil in situ formation of the active ingredients to improve wetting agent or in-situ emulsification of crude oil.