Application of New Type of Workover Fluid to Bohai Oil Field

Three types of workover fluid have been selected by experiment according to the characteristic of reservoir and crude oil in Bohai oilfield is different.These three types of workover fluid are broad spectrum type workover fluids,anti swelling type workover fluid and high-efficiency liquid,which can be used in conventional workover respectively.Experimental evaluation results show that with broad-spectrum workover fluid as a base fluid,we can make anti-swelling type workover fluid and high-efficiency liquid for different types of oil well,and good results have been obtained.The application results of the new workover fluid in Chengbei oilfield indicated that the new workover fluid can not only reduce the oil well recovery time after repair,but also increase the productivity of oil wells.The application results of the optimized formula in oil field are satisfactory.