人工夹层的抑制水锥作用的研究

FUNCTION OF MAN-MADE BARRIER ON BOTTOM-WATER CONING

人工夹层在油田开发的堵水防水中具有重要作用。从研究底水突入油井的机理出发 ,分析了底水上窜绕过人工夹层的过程。讨论了K H Coat的底水流模型 ,对底水绕过夹层时的累计水侵量进行了计算 ,分析了夹层所在的位置、大小和厚度对底水锥进的影响。研究表明 :人工夹层处于油水界面之上对底水锥进能有效的抑制 ,使开采效果得到提高 ;夹层半径越大 ,水侵量的减小越多 ,夹层的有效作用时间越长 ;人工夹层的作用还同油层的非均质性和开采速度密切相关。

Man-made barrier plays an important role in oil development. The mechanism of bottom-water coning in well and the shape of bottom-water coning through the barrier have been studied. Based on Coat's bottom-water flow model, bottom water influx when it coning through the barrier is calculated, and function of location, size and height of barrier to bottom water coning is analyzed. The results indicate that the barrier over the oil/water contact has a big effect on elimination of bottom-water coning, and it can increase exploit effect; the bigger the barrier is, the more the bottom-water influx decreases, and the longer its valid time has. In addition,the function of barrier also has close relation with the strata heterogeneity and exploration speed. The expression of water influx in the reservoir with barrier is presented.