In order to solve the problem of low permeation rate and high water injection pressure in peripheral oilfields, mining of No. 74 mine in Daqing Oilfield has strengthened the study of periodic injection technology, effectively improving the water displacement effect and easing the rate of water injection pressure increase. Daqing Mining No. 4 and 4 mine belongs to the Daqing peripheral oil field Taizhao block permeability is low, crude oil viscosity, wax content, crude oil freezing point higher. Water injection pressure rises rapidly due to the development of reservoir fractures. In the early 2000, the average water injection pressure was 12.2MPa, and the injection pressure rose to 19.02Mpa in 2002. This mine water injection system plunger pump up to 25.0MPa pressure, water injection pressure by 2010 will reach the maximum limit of existing water injection equipment. To this end, the mine organization special research group aimed at the heterogeneity of the reservoir in Taizhao Oilfield, from 2002 to gradually implement the cycle of water injection technology. In the whole ore 115 water injection wells, 111 wells were injected with periodic water injection. In the past 4 years, the average water injection pressure increased by only 0.78Mpa. The water injection pressure in Taizhao area has been eased up.
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