Analysis Of Comprehensive Regulation Potential For Shut Down Well And Study On Its Limit

During the process of development in oil-fields, it has unavoidably caused to plenty of shut down wells for various reasons. Shut down Wells have caused serious problems, such as: many assets is standing idle; the injection and production rate is becoming imbalance; disproportion the drawing up on reserves, est., which has a bad direct effect on the production and recovery of the Oilfield. However, with the development of the Oilfield at Extra High Water Cut Stage, the adjustment of injection-production relation and the alternation of oil price, some of shut down oil wells has reusable potential now, therefore it is necessary and important to find out the value and the regulation limit of them.In order to judge the potential for shut down oil wells, find out such oil wells bearing reused potential, and improve the economic returns, it is meaningful to study on the reusable potential for shut down oil wells. In the paper, the geologic situation, the injection-production relation and the causes of closing oil wells has been summed up and analyzed through in-depth study on the information of 57 shut down and have been regulated oil wells of Xingbei Oilfield. The prediction model of economic potential is based on the theory of economics profit and loss balance principle and reservoir engineering principle, this model can determine the closing economic limitations of oil wells and predict whether a closed-in oil well has reusable economic potential or not. Reusable potential prediction model is established in order to reuse the potential of shut down oil wells by considering development potential, and this model can realized the evaluation of the reusable potential for shut down oil wells by calculating the redeveloping potential index. The evaluation model of selecting wells and formations for fracturing is based on Fuzzy Mathematics theory, using this method for choosing the well and layer for fracturing. The prediction model of economic potential for the effectiveness of measure is based on the theory of economics profit and loss balance principle, this model can determine the measure of fracturing is feasible or not.Applying the above prediction models, the paper select out the wells and formations bearing reusable potential of typical block in Xingbei Oilfield. Predicting and evaluating the reusable potential of shut down oil wells based on the results of studying on the remaining reserves and the injection-production relation. Predicting the reusable potential of 14 shut down oil wells which have been implemented measure of fracturing, the results shows the potential to meet the rate of 85.6%, fracturing programs of 10 shut down oil wells which regulation limit was 5t have operated in Xingbei Oilfield, and they had good economic benefits.