Matching Technology Of Finely Injecting Water

Along with the continuous development in Daqing Oilfield, particularly secondary,third infill adjustment wells'production, the development of producing series of strata is getting more and more fine,oil layer and interbed thickness getting smaller and smaller,thus set a higher request to the separated layer water-flooding technology.At present there are many problems in water injection technology such as large distance between water injection allocator ,complex testing thchnology,low testing efficiency and so on, which cann't satisfy further subdivision potentiality in oilfield high water-cut later stage. According to the literature investigation and study, theoretical analysis and experience summarizes, the paper systematicly studied the axial force and creep deformation of pipe string and the factors of affecting the testing and adjustment efficiency of water-injection wells. Based on this, we studied the prevention and control technology of pipe string creep deformation, designed the side-pocket integration injection packer,which integrated side-pocket injection allocator and packer and realized water injection in small distance between water injection allocator. We developed new testing and adjustment technology ,realized the automatic real-time control and adjustment of downhole separate-layer flow rate, satified the flow injection allocation of water-injection layers of geologic programs, achieved the adjusting it while testing the goal,enhanced the testing and adjustment efficiency of water-injection wells, further developed and consummated the matching technology of water injection, which will play the powerful support role in effectively adjusting interlayer contradictory and increasing oil recovery in water flooding.