In view of the technical problem of poor practicality in determining injection intervals for existing separate injection wells,the optimization method of separate injection interval is studied.It is mainly to determine 10 geological parameters which are closely related to the division of injection section by using the method of big data analysis of production dynamics,and to use the method of mathematical transformation such as normalization,variable weight and matrix,etc.,based on the reservoir numerical simulation technology and the field dynamic monitoring and fitting technology,10 geological parameters are formed,optimization method of reasonable injection policy boundary aiming at increasing reservoir production.The calculation of an example shows that the required parameters of the method are easily obtained and the calculation process is simple,which overcomes the poor applicability of the existing method considering only static geological parameters,or need to establish a complex geological model to carry out numerical simulation of the cumbersome calculation process,and so on,to achieve the use of injection end,production end and well pattern of three types of geological parameters supplemented by simple mathematical calculation can determine the sub-injection scheme of the new method.The application of this method in the example well group gX Ⅱ has been optimized and implemented on site.The degree of oil layer utilization has increased by 15.7 percentage points,oil production has increased by 23.4 t/d,and general wate-cut has decreased by 1.16 percentage points,verifying the practical value of the new method for optimizing injection interal.
fine layered water injectionmarginalia sectionmarginalia coefficienttechnical limitsmarginalia modelutilization degree of oil layer
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