CAJ | 학술논문

由于具有较低的粘度和注入能力,CO2驱在低渗油田开发中相比衰竭和注水开发有明显的优势,而其开发效果受地质条件、油藏能量、流体特征及工艺技术等多种因素影响.常规的油藏数值模拟方法只能进行单次单因素分析,且不能分析不同因素之间的交互作用,难以满足上述低渗油藏CO2驱中的多因素多水平的研究需要.作者将实验设计方法引入上述CO2驱优化设计的数值模拟研究中,利用该方法可以利用少量具有代表性的CO2方案,最大量地获取需要的敏感性分析信息,从而有效提高数值模拟方法的效率.采用上述方法分析了低渗油藏CO2驱中的关键因素以及它们之间的交互作用,确定了适合低渗油藏条件的CO2驱注采方式、注采井型及其优化组合.研究表明,利用大斜度井连续注CO2,结合生产井生产气油比和油藏平均压力实施开关井控制方法可以增加注入能力、缩短开发周期,并能够同时获得油藏采收率和温室气体埋存的联合优化效果;研究同时发现存在相渗滞后作用的情况下油藏CO2埋存潜力较大.
유우구유교저적점도화주입능력,CO2구재저삼유전개발중상비쇠갈화주수개발유명현적우세,이기개발효과수지질조건、유장능량、류체특정급공예기술등다충인소영향.상규적유장수치모의방법지능진행단차단인소분석,차불능분석불동인소지간적교호작용,난이만족상술저삼유장CO2구중적다인소다수평적연구수요.작자장실험설계방법인입상술CO2구우화설계적수치모의연구중,이용해방법가이이용소량구유대표성적CO2방안,최대량지획취수요적민감성분석신식,종이유효제고수치모의방법적효솔.채용상술방법분석료저삼유장CO2구중적관건인소이급타문지간적교호작용,학정료괄합저삼유장조건적CO2구주채방식、주채정형급기우화조합.연구표명,이용대사도정련속주CO2,결합생산정생산기유비화유장평균압력실시개관정공제방법가이증가주입능력、축단개발주기,병능구동시획득유장채수솔화온실기체매존적연합우화효과;연구동시발현존재상삼체후작용적정황하유장CO2매존잠력교대.
With lower viscosity and higher injectivity, CO2 flooding has some advantages in tight reservoirs than depletion and water flooding, which can co-optimization the enhanced oil recovery and sequestration. The performance of CO2 flooding design is determined by different geological as well as engineering aspects. Considering the tight nature and relative permeability hysteresis in tight reservoirs, the CO2 flooding design in more very complicated with more challenges. The reservoir simulations were often performed in one factor at one time experimental design, in which the interactions between different parameters or factors are not taken into account. In this paper CO2 flooding optimization was simulated with compositional simulator "GEM" with experimental design to enhance the simulation efficiency and maximize the information gained from each uncertainty analysis. The key parameters and their interactions during CO2 flooding in tight reservoirs for EOR and sequestration were determined. This paper shows that continuous CO2 injection using directional injectors coupled producers′ Well Control method is the best scheme during CO2 flooding in tight reservoirs, which can give higher oil recovery and the most CO2 sequestration.