缝洞型碳酸盐岩底水油藏水锥风险条件综合评判

Risk evaluation of water coning by synthetic judgment in fractured-vuggy carbonate reservoir with bottom water

中国西部某底水缝洞型油藏,油井投产后底水锥进差异大、能量递减差异大,油井底水锥进导致的产量递减在65%左右。由于该油藏主要储渗空间为碳酸盐岩的岩溶缝-洞复合体,储层纵横向非均质性极强,油藏的控水与提液不易获得定量依据,研究了采用综合权重评判方法来评价该油藏油井水锥风险,进而调控油井合理产能,生产实践表明该方法是可行的。

After one oil well of fractured-vuggy oil reservoir with bottom water in western China was put into production,the differences of bottom water conning and formation energy reducing are great.The oil production decreases about 65% due to the bottom water conning of oil well.Because the main space of accumulation and permeation is Karst fractured-vuggy carbonate complexes and the vertical and lateral heterogeneity of reservoir is extremely strong,it is hard to quantitatively design the measurements to control the water conning and oil extracting.This paper adopted the synthetic weighting judgment method to evaluate the water conning risk and further control the reasonable productivity of oil well.Production practices show that this method is feasible.