Theadaptability Evaluation System Research Of Well Pattern And Water Flooding Regime In Super High Water Cut Stage

The adaptability evaluation of well pattern and water flooding regime is the importantcontent of reservoir engineering evaluation. In high water cut stage, especially in super highwater cut stage, the adaptability evaluation has instructive significance for grasping reservoirproduction dynamic effect and adjusting well pattern deployment, then we can adjust wellpattern and water flooding regime properly and oil recovery would be enhanced.Different evaluation indicator reflects different adaptability aspects of oilfield well patternand water flooding regime. Eight relatively comprehensive evaluation indicators, includingthe degree of well pattern controlled reserve, injection-production association condition,rational well spacing density, the control degree of water flooding, injection-productionbalanced situation, displacement pressure gradient, and multiple of water crossing, rationalfluid production rate, are selected as the object of study. The method of their quantitativecalculation are concluded and improved. Considering the anisotropy of reservoir physicalparameters, drawing ellipse method to calculate the area of well pattern controlled reserve isproposed. Considering the relationship of water cut and recovery ratio, the cash flow methodis improved to calculate economic rational well spacing density. The numerical methods aregiven out to compute displacement pressure gradient and multiple of water crossing.Multi-index comprehensive evaluation is a procedure to transform multiple evaluationindicators into one indicator which can reflect the comprehensive situation. The procedureand commonly used methods are summarized. The advantages and disadvantages of differentmethods are pointed out. Four different comprehensive evaluation methods, including directproduct composite method, linear weighted composite method, nonlinear weighted composite method, and dynamic weighted composite method, are used to analyze the instance, and thecomprehensive evaluation results are given.Mixed programming technology can not only take advantage of powerful matrixcalculation commands and graphics commands in Matlab, but also can use friendly interfaceprogramming in visual development tools like VC,VB. The well pattern and water floodingregime adaptability evaluation software is accomplished by using mixed programmingtechnology. This software takes advantage of the numerical reservoir simulation results andimproved calculation methods of evaluation indicators, which makes the adaptabilityevaluation to well pattern and injection-production system quantified, refined, and automated.