APPLICATION OF ACIDIZING TECHNOLOGY WITH ORIGINAL PRODUCTION STRING IN BOHAI OILFIELD

Because of the specialties of offshore Oilfield development, matrix acidizing should be applied to get investment back quicker for BoHai Oilfield. Considering the shortcomings of using the other set of string, such as complexity, affecting production efficiency, high operating cost, the paper give a viewpoint of acidizing with original production string. It is important to selecting fluid system with big action radium and weak solvability for offshore oil field with high porosity, high permeability. By making experiments in laboratory, the formula fluorboric acid system is selected; moreover, corresponding fluid temporarily plug technology and acid flowback technology are discussed. The operation can be done on platform without drilling ship, the acid flowback is also be treated by original ESP. The effect of discontinuous injecting acid and wireline corrosion has been tested by experiment. Practice applying show these can completely meet the demand of similar of oil fileds of BoHai, and which can be economic and make the operation easier than bofore.