Evaluation On The Effect Of CO₂ Flooding In High Water-cut Oil Fields

CO₂ flooding is a main method to enhance the high water cut oilfield recovery.And it is in favor of the underground storage of CO₂.The Production of oilfields in our country is decreasing continuously.In addition,the global greenhouse effect has a bad effect of people's daily life.So carbon-dioxide flooding has great significance.Before CO₂ flooding,effect evaluation about the flooding efficiency is very important about the selection of injection-production parameters and development scheme and the prediction of development effect.However,research shows that the current methods of evaluation about CO₂ flooding consequence are all limited.Evaluation methods and index selection are single.And there is no comprehensive evaluation system about it.This paper focuses on the technical effect,dynamic buried deposits and economic effects to establish the comprehensive evaluation system to evaluate the effect of CO₂ flooding in high water-cut oil fields.Based on a lot of literature research and previous studies,this paper evaluates the effect of CO₂ flooding in high water-cut oil fields.And the results are as follows:?1?The characteristics of the high water-cut oil field and advantages of CO₂ oil displacement are analyzed,and the selection of CO₂ oil displacement is studied.The technical feasibility,dynamic sequestration assessment and economic effect evaluation are all considered to select the evaluation indexes.The result is as follows:Form a set of effect about CO₂ flooding in high water-cut oil fields evaluation system,including technical effect and dynamic sequestration effect and economic effect;?2?The CO₂ gas flooding material balance equation is established,which is considering the interphase mass transferring.At the same time,quantificational research of parameters is carried out.A program is Writed for the calculation about living example.The result is as follows:CO₂ miscible phase displacement and non miscible flooding material balance equations are established.The result about the typical blocks of cumulative production is predicted;?3?Numerical simulation method was used to evaluate the result of CO₂ water alternating flooding in high-water cut oilfield.Orthogonal experimental is designed and simulation calculation was carried out to evaluate the oil displacement result.Contrastive analysis is carried out between CO₂ gas-water alternating flooding with the optimal injection scheme and other development methods.The result is as follows:the specific high water cut oil blocks of CO₂ flooding effect evaluation is completed.The optimal injection production program of CO₂ flooding is determined.The absolute superiority of the CO₂-water alternating flooding is determined.