本文關(guān)鍵詞： 泡沫 隨機泡沫數(shù)目守恒模型 驅(qū)替特性 多孔介質(zhì) 入口效應(yīng)　出處：《青島科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：泡沫技術(shù)在強化采油以及溫室氣體地質(zhì)埋存方面具有巨大的發(fā)展?jié)摿�。但是現(xiàn)在關(guān)于泡沫建模方面的研究還非常不成熟,先前關(guān)于泡沫的研究模型非常復(fù)雜,由于模型內(nèi)需實驗測定的參數(shù)過多,而在實踐中難以應(yīng)用。為了解決這個問題,本文提出了隨機泡沫數(shù)目守恒模型,該模型僅利用兩個參數(shù),來描述多孔介質(zhì)內(nèi)非穩(wěn)態(tài)驅(qū)替過程中泡沫的生成和發(fā)展。本文利用新提出的隨機泡沫數(shù)目守恒模型對泡沫液在多孔介質(zhì)內(nèi)的二維驅(qū)替特性進行了數(shù)值模擬分析,首先對泡沫液在均質(zhì)多孔介質(zhì)內(nèi)的入口效應(yīng)進行了研究,然后對泡沫液在非均質(zhì)多孔介質(zhì)內(nèi)的滲流特性進行了研究,并將數(shù)值模擬的結(jié)果與實驗結(jié)果進行了比較。計算結(jié)果表明:(1)由于在入口中心段注入,泡沫在多孔介質(zhì)內(nèi)的滲流過程顯示出明顯的入口效應(yīng);泡沫生成速率參數(shù)Kg增大時,入口效應(yīng)減小;而增大參數(shù)n∞,雖可提高驅(qū)替壓差,但對介質(zhì)入口段的液相飽和度分布影響不大。(2)泡沫液在非均質(zhì)多孔介質(zhì)內(nèi)流動時,首先在高滲透率介質(zhì)層流動突破,然后再波及低滲透介質(zhì)層;同時壓力的分布對泡沫液在非均質(zhì)多孔介質(zhì)內(nèi)的滲流特性起主要的影響作用。而且數(shù)值計算結(jié)果與實驗結(jié)果趨勢一致,說明隨機泡沫數(shù)目守恒模型能夠從機理上反映介質(zhì)內(nèi)泡沫的生成及湮滅機理,從而對泡沫液在非均質(zhì)多孔介質(zhì)內(nèi)的滲流特性進行正確分析。(3)通過對隨機泡沫數(shù)目守恒模型的參數(shù)研究發(fā)現(xiàn):參數(shù)Kg的值主要影響泡沫的生成速率,Kg越大,泡沫結(jié)構(gòu)的生成就越快;參數(shù)n∞的值主要影響泡沫的最大表觀粘度,n∞越大,泡沫流體表觀粘度越大,驅(qū)替效果越好。
[Abstract]:Foam technology has great potential in enhancing oil recovery and greenhouse gas geological storage, but the research on foam modeling is still very immature, and the previous research model on foam is very complex. In order to solve this problem, a stochastic foam number conservation model is proposed, which uses only two parameters. In order to describe the formation and development of foam in the process of non-steady displacement in porous media, the numerical simulation analysis of two-dimensional displacement characteristics of foam in porous media is carried out by using the new stochastic foam number conservation model. Firstly, the inlet effect of foam in homogeneous porous media is studied, and then the percolation characteristics of foam in heterogeneous porous media are studied. The numerical simulation results are compared with the experimental results. The results show that the flow process of foam in porous media shows obvious inlet effect due to injection at the entrance center, and the foam formation rate parameter K g increases. The inlet effect is reduced, and the increase of the parameter n 鈭，

本文編號：1530473