A Study Of Development Effect Evaluation And Potential Improvement For High Water Cut Oilfield

Water injection is adopted to develop oilfield because it is economical, effective, and easy to operate, but because of formation and fluid heterogeneity, water cut of wells is high while a few of oil is recovered. High water cut stage is important throughout oilfield development. To some extent, whether oilfield can be exploited effectively and efficiently during high water cut stage will determine whether oilfield can be exploited effectively and efficiently, so it is significant to study the potential improvement and development technique for high water cut reservoir. This dissertation studies systemically the development effect evaluation, the residual oil distribution and potential evaluation, the development technique and policy, as well as improvement methods and treatments. Specific researches are done as follow:1、systemically study and analyze the methods of development effect evaluation and evaluation indexes domestic and abroad for high water-cut oilfield and according the characters and actual meanings, classify the evaluation indexes, study the calculation methods and evaluation criterions for the various evaluation indexes and creatively use fuzzy mathematics to judge comprehensively development effect.2、Further recognize the geology properties and development conditions of KADUOFU oilfield and analyze present development problems and contradictions, and use the evaluation system established to evaluate the development effect of KADUOFU oilfield.3、Study the residual oil distribution of KADUOFU oilfield by comprehensive reservoir engineering performance analysis and numerical simulation, and objectively evaluate the potential production and the methods for potential improvement to provide techniques for developing the residual oil.4、Study the development techniques and policies for high water-cut oilfield, including injection and production abilities of injection wells and production wells, reasonable injection and production system of reservoirs, rational development rate, reasonable ratio of injection with production, reasonable injection method and injection intensity and so forth. 5、On the basis of systemically studying the main techniques and treatments for developing high water-cut oilfield, creatively use AVS comprehensive judgement to screen the profile modification wells, water plug wells, acid wells which improve success and high efficient of the measures.By systemic study, this paper establishes the development effect evaluation system for high water-cut oilfield, investigates the residual oil distribution predication methods, the potential improvement and the development techniques to provide techniques for developing effectively and efficiently high water-cut oilfield.