Research and Application of Acidizing Fluid Formulae with Original Production String Acidizing for Bohai SZ36-1 Oil Field

SZ36-1 oil field of Bohai is weakly consolidated sand formation which is characteristic of high porosity, permeability and viscosity.In order to realize an acidizing treatment with original production string which will lead to an effective removal of the near wellbore zone plug and a deep penetration of the acid without significant erosion of downhole string, ESP and its wireline, an acidizing fluid foumula fluorboric acid is selected on the base of analyzing the feature of SZ32-1 oil field and running a large number of laboratory experiments.This formular can remove the plugging of near wellbore zone effectively and do little damage to gravel pack, downhole string, ESP and its wireline, and also maintain itsgood quality after a 2-day lay aside, which meets the needs of interval injecting acid when platform area is limited.