Preparation and performance evaluation of Tahe temperature and salt resistant gel plugging agent
Two types of polyacrylamide(Q-9,Q-7)as the main agent,black locust bean gum as the strengthening agent,thiourea as the deoxidizer,hydroquinone,urotropine as the crosslinking agent,pre-pared a gel plugging agent with temperature resistance and salt resistance;the best formula was selected according to the viscosity of the base fluid,gel forming time,gel forming strength and dehydration,and the gel forming strength,temperature resistance and plugging effect of the gel plugging agent were investiga-ted.The results show that the optimal formula is 1％polymer Q-9,0.5％polymer Q-7,0.3％locust bean gum,0.25％thiourea,0.6％urotropine,and 0.6％hydroquinone.The viscosity of the base solution is 854.4 mPa·s.Under 130 ℃ conditions,the gelation time is 3.4 h,the gelation strength is 34～37 Pa,and the dehydration within 30 d is 0.443 9 mL;when the 1 PV gel base fluid was injected,the break-through pressure reached 36 MPa,and the plugging rate was 99.63％.
geltemperature and salt resistanceblocking agentsealing rate
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