首页|A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity
A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity
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NETL
NSTL
万方数据
维普
Conformance control and water plugging are a widely used EOR method in mature oilfields.However,majority of conformance control and water plugging agents are unavoidable dehydrated situation in high-temperature and high-salinity low permeability reservoirs.Consequently,a novel conformance control system HPF-Co gel,based on high-temperature stabilizer(CoCl2·H2O,CCH)is developed.The HPF-Co bulk gel has better performances with high temperature(120 ℃)and high salinity(1 x 105 mg/L).According to Sydansk coding system,the gel strength of HPF-Co with CCH is increased to code G.The dehydration rate of HPF-Co gel is 32.0％after aging for 150 d at 120 ℃,showing excellent thermal sta-bility.The rheological properties of HPF gel and HPF-Co gel are also studied.The results show that the storage modulus(G')of HPF-Co gel is always greater than that of HPF gel.The effect of CCH on the microstructure of the gel is studied.The results show that the HPF-Co gel with CCH has a denser gel network,and the diameter of the three-dimensional network skeleton is 1.5-3.5 pm.After 90 d of aging,HPF-Co gel still has a good three-dimensional structure.Infrared spectroscopy results show that CCH forms coordination bonds with N and O atoms in the gel amide group,which can suppress the vibration of cross-linked sites and improve the stability at high temperature.Fractured core plugging test de-termines the optimized polymer gel injection strategy and injection velocity with HPF-Co bulk gel system,plugging rate exceeding 98％.Moreover,the results of subsequent waterflooding recovery can be improved by 17％.
NETL
NSTL
万方数据
维普
