期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：310
期号：4
页码：1-7
DOI：10.1088/1755-1315/310/4/042030
出版社：IOP Publishing
摘要：With the development of polymer flooding in Daqing oilfield, the II and III formation with low permeability and apparent interlamination contradictory has been developed for the main target. Due to the big difficulty of testing, the low successful ratio of running and fishing, the high cost of changing the strings for water flooding and polymer flooding, the original separate layer polymer injection failed to be applicated extensively. In order to resolve the problems mentioned above, the integrated separate layer injection technology on polymer flooding was researched in this paper. The eccentric injection regulator, the pressure regulator with low viscosity loss ratio and high pressure choke, the molecular weight regulator with high viscosity loss ratio and low pressure loss are designed, the injetion of high permeable interval and the molecular weight of medium and low permeable interval can be controlled at the same time. The separate injection string is compatible with water flooding technology and it can be satisfied the requirement of the blank water flooding, polymer flooding and sequent water flooding, the investment and operation cost are dropped. The field application of more than 1000injection wells show that the empoly degree of the II and III kind formation is improved obviously and the rude oil revovery enhanced 2 percent above after using the new style separated injection technology.
