Research and Application of Acidizing Technique for Low Porosity and Low Permeability Sandstone Reservoir in Baolang Oilfield

In consideration of the problems of high temperature, high contents of acid sensitive materials and high water injection pressure(above 25 MPa) existing in low porosity and low permeability reservoirs in Baolang oilfield, through experiments in lab, a synthetic acid system is developed, which is characterized by retardation, velocity sensitive prevention, temperature resistance and small damage to reservoir, and a complete set of operation procedures are established as well Field tests are performed on 11 oil wells and 17 water injection wells The results show that the water injection rate of single well increases from 22 7 m 3 per day to 81 1 m 3 per day Total stimulation is 23 5×10 4 m 3,and the average valid period is 356 days