Study On HPAM Double-crosslinked Gel For In-depth Profile Control And Oil Displacement

Profile control is one of the most important ways to stabilize oil and water control inhigh water production period, and PAM gel, a convertional water shut-off agent, has beenwidely used. In order to solve the PAM gel problem, such as little crosslinking time, weakstrength, high working concentration and so on, DC-HPAM was studied deeply to getcrosslinking time delayed and adjusted, reduce concentration, improve stability, strengthprofile control and oil displacement efficiency. By study of single-crosslink gel, crosslinkeradjusted to–COO- and–CONH2 were selected. Organic chromium/aldehyde DC-HPAM geland Organic chromium/YG DC-HPAM gel were mainly researched, performance wereevaluated in defferent concentrations, crosslinker types, and environmental conditions. Within60℃~90℃, crosslinking time of organic chromium/aldehyde DC-HPAM gel was 300h,break-through pressure grade was 21.1MPa/m, plugging rate is 95.33%, and the type ofcrosslink is asynchronous double crosslink, within 40℃~60℃, crosslinking time of organicchromium/YG DC-HPAM gel was 180h, core break-through pressure grade was 27.6MPa/m,plugging rate is 99.88%, and the type of crosslink is synchronization double crosslink,DC-HPAM showed higher performance than sinle-crosslink gel, crosslinking time delayed100h, Na+-tolerance concentration increased 15000mg/L, break-through pressure gradeincreased 5 MPa/m, plugging rate increased 5%, dehydration didn't appear whthin 90d inexperimental condition. Microstructure was analysized by SEM, inorganic chromiumsingle-crosslink gel contained much pore space, and structure appeared loose, DC-HPAM hadcompact structure little pore, organic chromium/aldehyde DC-HPAM gel looked likemountains, and phenolic resin particles distributed equally in organic chromium/YGDC-HPAM gel structure.