本文關(guān)鍵詞：基于格子Boltzmann方法的致密氣藏微尺度效應(yīng)研究　出處：《斷塊油氣田》2016年06期 　論文類型：期刊論文

  更多相關(guān)文章： 致密砂巖 微尺度效應(yīng) 格子Boltzmann方法 克努森數(shù) 滲透率

【摘要】：致密儲層孔隙結(jié)構(gòu)復(fù)雜,氣體在致密孔喉中的流動存在微尺度效應(yīng),宏觀流動規(guī)律難以準確描述其滲流特征。針對致密多孔介質(zhì)孔隙主要分布在微納米尺度的特點,建立修正克努森數(shù)(Kn)、固體邊界處考慮鏡面反彈(邊界滑移效應(yīng))的格子Boltzmann模型。通過模擬壓差驅(qū)動下的二維平板流動,驗證了模型的正確性,并分析了克努森數(shù)對流動速度的影響�；陔S機生長四參數(shù)生成法,對致密儲層的二維微觀孔隙結(jié)構(gòu)進行了重構(gòu),利用修正格子Boltzmann模型進行流動模擬。結(jié)果表明:氣體在致密儲層中的流動存在微尺度效應(yīng),滑脫效應(yīng)使得通道中間部分流體速度增大;在一定的壓力梯度下,滲透率隨著克努森數(shù)的增加而呈線性增加;克努森數(shù)不變時,滲透率隨著平均壓力倒數(shù)的增加而呈線性增加,即隨著平均壓力的增加,巖心的絕對滲透率減小。
[Abstract]:The pore structure of the tight reservoir is complex, and the flow of gas in the tight pore throat has microscale effect. It is difficult to describe the percolation characteristics of macroporous media accurately. Aiming at the distribution of pores in dense porous media on micro- and nanoscale scale, a modified Knudsen number (Kn) is established. The lattice Boltzmann model with mirror rebound (boundary slip effect) is considered at the solid boundary. The validity of the model is verified by simulating the two-dimensional plate flow driven by pressure difference. The influence of Knudsen number on the flow velocity is analyzed. Based on the method of generating four parameters of random growth, the two-dimensional micro-pore structure of tight reservoir is reconstructed. The modified lattice Boltzmann model is used to simulate the flow. The results show that there is a microscale effect in the flow of gas in the tight reservoir, and the slippage effect increases the velocity of the fluid in the middle part of the channel. Under a certain pressure gradient, the permeability increases linearly with the increase of Knudsen number. When the Knudsen number is constant, the permeability increases linearly with the increase of the reciprocal of the mean pressure, that is, the absolute permeability of the core decreases with the increase of the average pressure.
【作者單位】： 中國石油大學(北京)石油工程教育部重點實驗室;中海油研究總院開發(fā)研究院;
【基金】：國家自然科學基金項目“基于孔隙網(wǎng)絡(luò)模型的多孔介質(zhì)近混相油氣水三相流動模擬研究”(11072268)
【分類號】：TE312
【正文快照】： 隨著非常規(guī)油氣資源日益受到重視,致密氣藏的勘探開發(fā)逐漸成為熱點[1￣3]。由于致密儲層巖性致密,滲透率極低,實驗時對設(shè)備和技術(shù)人員要求較高,常規(guī)的實驗方法難以保證實驗數(shù)據(jù)的準確性和精度。作為一種介觀模擬方法,格子Boltzmann方法可以對處理過的多孔介質(zhì)圖像進行流動仿真

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4 陳代s，

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