The Research Of Polymer Eccentricity Injection Technology

The polymer drived oil is widely used in the main oil layer of DaQing oil field.It effected on raising the last recovery ratio,preventing the production from reducing,improving development effection in the late for high percent water. The technology of the polymer driving oil has become an very important technology in increasing reserves,continue development in the late for high percent water in the DaQing oilfield.However, the larger of the area that the polymer injection in the main oil layer,the little remaining reserves in the first and the second type of the oil layers that adopt to polymer drive oil .It is not only important that we research effection of the polymer drive oil and feasibility of the polymer drive oil in the third oil layer but also we look for potential that replace the injecting polymer's reserves in the first and the second typy of the oil layers.We must inject polymer seperatly in the defferent layers in order to cooperate the field experiment of the third infill in the mid-west of the oilfield with the polymer driving oil,to improve accepting fluid thickness,to improve the producting reserves in the bad oil layers,to adjust the composition of the polymer injection. The present technology that the polymer are seperatly injected in the defferent layers did not content the reqest that inject polymer to many layers in the third type of oil layer.We must develop a technology that the polymer are injected to many layers.So that the intaking imbalance antinomy caused by the deffernce between the lower penetration layer and the out of layer in the defferent layers in the commingled water injection wells will be soluted .Thus the third production is impossible in the third type of layer.The final recovery efficiency will be increased.This paper integrating utilize the Dimension Theory,the Law of Similarity,Ï€Theory to establish the norm formular that the polymer flow inside the pipes with isometry circline space. And give the formular's derivation.Design the interior experiment. We get the friction coefficient fit formular that The non-newtonian Fluid flow inside the pipes with isometry circline space combinate the experiment datas and the least square method.So that we get the pressure drooping, the rate of flow,the size of the circline space and the relationship of The non-newtonian Fluid flowage parameters that The non-newtonian Fluid flow inside the isometry circline space. We utilize optimizing design result to develop the decenter injection proration equipment .We develop the bridge decenter separating layer injecting polymer pipes and tools adapt the pipes with lower shear degradation that adapt to separating injection above four layers without the limit numbers.We test the technology in nine wells.Used the Electronic Memory Flowmeter to allocate the testing separately.The data showed the numbers of the intaking layer after separating injection are more than the commingled water injection.The intaking thickness encharge.Contrast the before the polymer injection,the producting fluid percent day reduced,the producing oil percent day increased,the synthesize water contained reduced. The technology that bias separating layer injection on the polymer driving oil solute the problem that the polymer driving on many layers separating injection in the third type layer.It improve accepting fluid thickness,to improve the producting reserves in the bad oil layers, The final recovery efficiency will be increased. It has the biggest technological economic valuation and society benefit.