Of Dongxin Improve Water Flooding Recovery Influencing Factors

Combined with the reservoir style, development history, and presentdevelopment status of Dongxin oil field, the influence of such factors asheterogeneous feature, moisture, rhythmic feature, injection well pattern andinjection-to-producing-well ratio to the water driving effect are discussed here.Applying such methods as the fine geological description, multi-function welllog interpretation of new well, profile analysis, dynamic data, numerical simulationetc. the author studies the distribution of remaining oil in different reservoir, andmakes the appraise about potential to enhance recovery next in different reservoirs,and brings up many related technologies to enhance water driving recovery, such assubdivision development, periodic injection, water plugging , and infill chillingadjustment etc.Especially to the complicated fault block reservoirs of Dongxin oil field, becauseof the characters of complex structure, diversified sedimentation style, multi-layers,etc., a clear acknowledge to the reservoirs cannot be achieved once. During theoriginal development, the oil layers were divided relatively coarsely, and followingthe development the contradictions between layers are becoming aggravated, waterabsorbing capacity of the medium-low permeability layers are reducing, and theirpotentials cannot be brought into play. In order to solve the problem, the authorstudies the influence of such parameters as permeability, number of main layers,reservoir thickness, oil property to interlayer interference, and studies the technique oflayer series subdivision in the stratified-faulted reservoirs during the high water-cutdevelopment phase. Then researches on the standards of development layer divisionare developed, and the subdivision technique to enhance the water driving recovery inthe stratified-faulted reservoirs during the high water-cutting development phase areformed, and remarkable results are achieved through the application of thetechnique in Xin 47 and Xin 50 faulted block reservoirs, especially in Xin 47 faultedblock reservoir the recovery has been enhanced to 40ï¼…from 36ï¼…, and therecoverable oil increased 300000 tons.