腰英台油田二氧化碳非混相驱提高采收率技术研究

发布时间：2019-04-22 14:05

【摘要】：CO_2驱提高采收率技术在国外已经得到了很多成功的应用,但我国CO_2驱提高采收率技术起步相对较晚,近几年来我国先后在大庆、吉林、胜利等油田开展了CO_2驱先导性试验,取得了一些经验。腰英台油田自2011年实施CO_2驱先导性试验以来,虽然取得了一定的效果,但也暴露出许多亟待解决的问题,如地层中CO_2相态不清晰,CO_2驱效果首要影响因素不明确,缺乏一种有效的CO_2非混相驱效果评价方法、亟需提高腰英台油田CO_2驱效果的技术对策等。针对以上问题,采用井筒多相管流计算的方法对CO_2相态变化规律展开研究,研究结果表明注入的CO_2在地层中存在混相段、超临界段和气态段三种阶段,多数CO_2处于超临界态;采用灰色关联分析和模糊数学的方法对CO_2驱影响因素开展研究,结果表明地层压力与混相压力的比值对CO_2驱效果的影响权重为39%,是影响CO_2驱效果的首要因素;采用支持向量机模型预测的方法对腰英台油田CO_2非混相驱效果进行评价,结果表明截止至目前为止腰英台油田CO_2非混相驱增产效果不理想,还未达到国内其他CO_2非混相驱试验区水平;采用物模实验的方法对CO_2泡沫封堵参数展开优化研究,筛选出发泡能力及泡沫稳定性较好的起泡剂B,实验结果表明B起泡剂溶液CO_2泡沫最佳注入方式为气液同时注入,最佳起泡剂浓度为0.5%,最佳注入速度为0.7mL/min,最佳气液比为1:1;采用油藏数值模拟方法对提高区块CO_2驱效果的技术对策展开研究,提出分层注气技术、间开间注技术、周期注气技术及变非混相为混相等技术对策。
[Abstract]:CO_2 flooding enhanced oil recovery technology has been successfully applied abroad, but it started relatively late in our country. In recent years, our country has been in Daqing, Jilin Province, The pilot test of CO_2 flooding has been carried out in Shengli and other oilfields, and some experiences have been gained. Since the pilot test of CO_2 flooding was carried out in Yaoyingtai Oilfield in 2011, although some results have been achieved, many problems need to be solved are exposed, such as the unclear phase state of CO_2 in formation and the unclear primary influencing factors of CO_2 flooding effect. There is a lack of an effective evaluation method of CO_2 non-miscible flooding effect, so it is urgent to improve the technical countermeasures of CO_2 flooding effect in Yaoyingtai Oilfield. In view of the above problems, the variation of CO_2 phase behavior is studied by the method of wellbore multiphase flow calculation. The results show that there are three phases of injected CO_2 in the formation: mixed phase, supercritical phase and gas phase, and the results show that there are three phases in the injected CO_2, namely, miscible phase, supercritical phase and gas phase. Most of the CO_2 are in the super critical state; The influence factors of CO_2 flooding are studied by means of grey relational analysis and fuzzy mathematics. The results show that the influence weight of formation pressure to miscible pressure ratio to CO_2 flooding effect is 39%, which is the primary factor affecting CO_2 flooding effect. The effect of CO_2 non-miscible flooding in Yaoyingtai oilfield is evaluated by using support vector machine model. The results show that up to now, the effect of CO_2 non-miscible flooding in Yaoyingtai oilfield is not satisfactory. It has not reached the level of other CO_2 non-miscible flooding test areas in China. The plugging parameters of CO_2 foam were optimized by physical model experiment, and the foaming agent B, which had good foaming capacity and foam stability, was screened. The experimental results show that the best injection mode of CO_2 foam in B foaming agent solution is gas-liquid injection at the same time, the best foaming agent concentration is 0.5%, the best injection rate is 0.7 mL / min, and the optimum gas-liquid ratio is 1 渭 1; The technical countermeasures of improving CO_2 flooding effect in block are studied by using reservoir numerical simulation method. Some technical countermeasures are put forward, such as stratified gas injection technology, inter-interval gas injection technology, periodic gas injection technology and changing non-miscible phase into miscible phase.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.7

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