腰英臺(tái)油田二氧化碳非混相驅(qū)提高采收率技術(shù)研究
[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.
【學(xué)位授予單位】:中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TE357.7
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