榆树林油田CO_2吞吐采油目标井优选方法研究

CO_2吞吐是开发低渗透油田的有效方法之一,但进行CO_2吞吐前目标井的优选是关键步骤,它直接关系到CO_2吞吐措施的成败.首先分析了剩余油饱和度、油井含水率、油层厚度、渗透率、孔隙度、井底流压各因素对CO_2吞吐效果的影响,从而建立评价指标,然后利用层次分析方法确定各单因素的合理权重,最后根据模糊综合评判法优选出树11Y68-57和树11Y67-611两口油井适宜CO_2吞吐.优选出的油井具有良好的的油效果,表明该方法是正确可行的,具有一定的推广价值.

The Research Method of Target Oil Wells Selection for CO2 Huff and Puff in Yushulin Oil Field

CO_2 huff and puff is one of the effective methods to develop the low permeability oil fields.But the preference of target wells before conducting CO_2 huff and puff is the key step,since it is directly related to the success or failure of CO_2 huff and puff measures.The influence of various factors such as remaining oil saturation,water cut,reservoir thickness, permeability,porosity and flowing bottom hole pressure on the effect of CO_2 huff and puff is analyzed firstly in this paper so as to establish an evaluation index.And then analytic hierarchy process(AHP) is used to determine a reasonable weight of single factor.And finally,two oil wells,Shu 11Y68-57 and Shu 11Y67-611,are optimized for CO_2 huff and puff according to the fuzzy comprehensive evaluation method.The two wells optimized have a better effect of improving oil,which shows that the CO_2 huff and puff technology is feasible and has a certain generalized value.