Research On Augmented Injection Technique Of The Deep-penetrating Acidification In Low Permeable Reservoir Of Bin 660 Block

South of Bin 660 block is a low permeable reservoir.On the research of the geologic reservoir features and the analyze of the current problems in the water injection and the used-ways to enhanced oil recovery, the Deep penetration acidification is suggested to be used for in-depth dredge, so that the water intake of high peameability zones will be controlled and the water intake of low permeability zone will be improved.On the basis of the laboratory experiment on the Deep penetration acidification, the optimum conditions are determined. The hydrochloric acid is 12%,the hydrofluoric acid is 3%,the fluoroboric acid is 5%.And the most optimal concentration of the acid additives are determined.The inhibitor LHH is 2%,the iron stabilizer LHT is 2%,the cleanup additive RSZ-06 is 0.5%,the clay stabbilizer QCNW is1.5%. The core dynamic flow experiments show that this acid system has good retarder performance and good dissolution ability. It also has good compatibility and acidification effect. All can meet the demand of solving the injection wells depth acidizing of Bin 660 block.