本文關(guān)鍵詞：頁巖氣滲流數(shù)學(xué)模型，，由筆耕文化傳播整理發(fā)布。

頁巖氣滲流數(shù)學(xué)模型

Gas flow in shale reservoirs

[1] [2] [3] [4]

XIA Yang,JIN Yan,CHEN Mian,CHEN KangPing（1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 2 School for Engine

[1]中國石油大學(xué)(北京),石油工程教育部重點(diǎn)實(shí)驗(yàn)室,北京102249; [2]School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe AZ 85287-6101, USA

文章摘要：針對頁巖氣藏流體運(yùn)移機(jī)理復(fù)雜、傳統(tǒng)模型難以準(zhǔn)確描述的難題,本文綜合考慮頁巖氣在孔隙中的黏性流動、Knudsen擴(kuò)散以及吸附氣的表面擴(kuò)散和因巖石變形引起的滑移分別建立自由氣和吸附氣擴(kuò)散方程,建立頁巖氣在基質(zhì)與裂縫中的滲流數(shù)學(xué)模型,并采用非線性非平衡Langmuir吸附理論分析頁巖氣滲流過程中的解吸附機(jī)理.通過數(shù)值模擬方法研究了不同流動機(jī)制對頁巖氣產(chǎn)量的影響,結(jié)果表明,吸附氣的表面擴(kuò)散與滑移對頁巖氣產(chǎn)量的影響均在0.1%以下,可以忽略;黏性流動與Knudsen擴(kuò)散主導(dǎo)頁巖氣的滲流;非平衡吸附速率對頁巖氣產(chǎn)量影響較大,吸附速率越大,產(chǎn)量越大.本文建立的模型能較好地揭示頁巖氣的復(fù)雜滲流機(jī)理,并為頁巖氣藏的開發(fā)提供了科學(xué)基礎(chǔ).

Abstr：This study incorporates various gas transport mechanisms in shale nanopores with nonlinear and non-equilibrium gas adsorptiondesorption kinetics. We formulate a simplified model for matrix and hydraulic fractures to study the dynamic production performance of multi-stage fractured horizontal wells in shale gas reservoirs. The gas transport mechanisms include viscous flow, Knudsen diffusion of free gas, surface diffusion, and slippage of adsorbed gas whilerock deformation is coupled in the flow equations. The sensitivity of the production rate to key physical parameters is examined through numerical simulation. Our results indicate that the viscous flow and Knudsen diffusion dominate the production of shale gas. The production rate was sensitive to the desorption rate while largely unaffected by the surface diffusion and slippage of the adsorbed gas, given that the transport process of adsorbed gas is a much slower process than the diffusion of free gas.

文章關(guān)鍵詞：

Keyword：:shale gas flow mechanism non-equilibrium desorption numerical simulation

課題項(xiàng)目：國家杰出青年科學(xué)基金（51325402）; 國家自然科學(xué)基金重大項(xiàng)目（51490650）;國家自然科學(xué)基金重點(diǎn)項(xiàng)目（51234006）資助

作者信息：會員可見

  本文關(guān)鍵詞：頁巖氣滲流數(shù)學(xué)模型，由筆耕文化傳播整理發(fā)布。