Research On Cross-linked Polymer For Deep Profile Control In Jurassic Reservoir

Jurassic Reservoir is a high interlayer haterogeneity oil field. Ather years of water-injection, there are more and more high permeability zones. On the research of the geologic reservoir features and the analyze of the current problems in the water injection and the used-ways to enhanced oil recovery, the cross-linked polymer is suggested to be used for in-depth profile,so that the water intake of high peameability zones will be controlled and the water intake of low permeability zone will be improved .On the basis of the laboratory experiment on the cross-linked polymer, the optimum conditions are determined. The polymer HDT-4 is 0.3%,the crosslinker HDJ-2 is 0.6%,the additive is 50mg/L. And the gelation time of the gel is about 40 to 50 hours , the steength is about 700mPa.s. The core flow tests show that the gel has good thermal stability, salt resistance and high damage ratio. Numerical Simulation Study shows the the cross-linked polymer concentration is 1900 mg/L, the slug size is 0.6 PV, the proper time of the water cut is about 80%.The oil field's implementations in Yue 29 shows that the cross-linker polymer has useful effects. The high peameability zones are controlled, so that the water can be injucted to the low permeability zones. The water injection profile and the water injection pressure is improved. The output of the oil well is raised.