The oily sludge from the 8th plant of Changqing Oilfield in the cleaning tank and the combined treatment station have been analyzed, including the particle size of the solid phase particles, which showen that more than 30% of the particles have a particle size of more than 209.3μm and also contain a large amount of iron element and polycyclic aromatic hydrocarbon . After dispersion, the size of solid particles which was more than 98% was reduced to be less than 100μm. The influences of different types dispersant and suspension of oily sludge were analyzed and determining the most suitable formula was:40% oily sludge+0.4% SAS-60 + 0.4% F-68 + 0.2% FPAM, then mixing the gelatinizing agent. Based on all of these, a novel gel oily sludge profile control system was prepared. The water injection well chosen for the profile modification pilot was Tie 56-102 at reservoir layer. Totally 2305m3 profile control agent was injected in 3 slugs in 71 days and 400m3 of pure oily sludge was consumed. During profile control agent injection the injecting pressure was fast raised by about 2.7MPa and kept at a level 10.8MPa. The water content of corresponding well Tie 56-101 and Tie 56-103 was drop by 11.5% and 9.8% and 0.6m3/d and 0.5m3/d oil was produced additionally.