About The Remaining Oil Understanding And The Excavation Method Research In The North 1-5-P48 Well Area Of North 1 Fault East Side's Pu Ⅰ Group After Polymer Flooding

At present the degree of reserve recovery of Daqing Oil Field main force oil layer reachs 50-55% after polymer flooding, the surplus oil potence is bigger; with the comprehensive promotion of polymer flooding in the development zone main force oil layer of the middle area of Sa, the following water flooding zone increases one after another, therefore how to develop the surplus reserves of the main force oil layer after polymer flooding, and further to enhance the recovery ratio of the main force oil layer, is the important link to maintain the oil field sustainable development, but further to enhance the recovery ratio technology measures rely on the surplus oil pattern after polymer flooding. So we choose the nine fillings and 16 pluckings the pilot area of the North 1-5-P48 well area of north 1 fault east side's pu I group to carry on the scientific research. Through the research, we will explore main force oil layer the surplus oil distribution rule after polymer flooding, and provide the basis for digging this surplus potentialThis research synthesized at present research effort of the surplus oil after polymer flooding, proposed an new clue of the surplus oil distribution rule after polymer flooding, namely based on the internal construction structure dissection of the typical zone, knew the surplus oil of the main force oil layer of the north 1 area the surplus oil again after polymer flooding, takes this basis to dig the surplus reserves after polymer flooding. Proposed for the first time to use the structural unit of the PI group level under the dense well pattern condition in the following water drive stage to make modeling, researched on the surplus oil influence after polymer flooding in the different distribution of barrier and interbed ; Using drilling at the proper time to determinate cyclic waterflooding combination way and the reasonable parameter; using the borehole formation sealing technology of the SD low temperature oil layer to seal off water level which the water-injection well is invalid to it; Using the improvement medicinal of permeability to dig the top surplus oil of the thick oil horizon; Using the adjustment and formation sealing technology of oiliness sludge to improve the effect water-injection development. Through the new and old technical union, to implement the excavation measure, this excavation technology will be perfect and mature in the research and application process day by day, developing the old technology and attempting the new technology, it will realize leapping from the interlayer into the layer and from the layer into the structural unit, the maximum limit to dig the surplus reserves after polymer flooding. Further to enhance the recovery ratio and accumulate experience for the development work of the other noted polymer area to change into this stage. So the feasible technology of the following water drive stage has the widespread application space, which will bring the huge economic and social efficiency, the promoted application prospect is broader.