Preparation and evaluation of gel oily sludge profile control system

Aiming at difficult injection and easily secondary produced of oily sludge profile control agent, the microstructure characteristics and composition of oily sludge in Shenli oilfield were measured and analyzed by SEM. And then the influences of different types dispersant on dispersivity of oily sludge were analyzed and determining the most suitable adding amount of dispersant Na2CO3 was 0.8% ~ 1.0%. Through the rheological experiments the effects of four suspending agents on suspensions of oily sludge were analyzed respectively, and the appropriate suspending agent and their additive amount were optimized. Based on all of these, mixing the gelatinizing agent and initiator, a novel gel oily sludge profile control system was prepared. Finally, fracture stress was measured and profile controlling effect of this novel agent was evaluated through physical simulation experiments. The results showed that the brittle fracture of oily sludge profile control gel could not happen in reservoir conditions, and could enhanced oil recovery 5.5% effectively.