Geologic Feature Of Sub-layers And Tri-layers Reservoirs And Water Flooding Experiment In Sazhong Development Zone

In the view of the prevalent problem of the potential of water flooding has reduced in the Sazhong zone development(sub-layers reservoir where the channel sand river sand in more than one meter reservoir thickness, oil is less than one meter of the effective thickness of channel sand production decline rapidly),output declines rapidly. Although the test of sub-layers reservoir and tri-layers reservoir achieved good results, but after the oil polymer flooding there is no method to improve the recovery because of the interference of water flooding and high cost, Scale is limited and yielded poorly cannot make up water flooding, therefore improving the effection of water flooding development is the main measures for production in sub-layers reservoir and tri-layers reservoirAccording to "11th five-year" plan in Sazhong development zone,select the typical layerâ…¡10 toâ…¢10 reservoir which can represent sub-layers reservoir and tri-layers reservoir,deploy two sets of wells of sub-layers reservoir and tri-layers reservoir,carry water flooding development and then the third oil recovery,explore a development mode that combinethe second,third oil recovery between sub-layers reservoir and tri-layers reservoir. Use the water flooding development through research on the dynamic and static data well understand testing oil development characteristics, according to the "two-three combination"guiding ideology, integrating with water flooding, polymer material and development regularity study well optimized, development target, and the remaining oil distribution. According to the test data of two kinds of new drilling knowledge structure and the remaining oil reservoir microscopic characteristics, adopted selectively perforating method, the initial water than 3.7 percentage points lower solution, and water flooding mature technology,the comprehensive application of layer segment, profile, injection wells, lift pressure cycle control blocking technology, slow down the water flooding,forecast the recovery rise above 6%.This experiment can prolong water flooding time, improve water flooding development, improve the recovery of water flooding, prove sub-layers reservoir and tri-layers reservoir water flooding separate mode of overall exploitation is feasible and explore a new mode of development zonesin the Sazhong zone development of Daqing oilfield and provides technical reserves for the table and sustained development of Daqing Oilfield.