【摘要】：深入認識熱采環(huán)境下泥巖層的應(yīng)力演化規(guī)律及破壞機理,有助于科學(xué)有效地解決稠油藏注汽過程中的蓋層破裂問題及隔夾層遮擋問題。首先,從理論上定量研究了熱采油藏泥巖層的傳熱、增壓機制,分析了變溫、變壓條件下泥巖層不同的應(yīng)力演化規(guī)律及破壞模式;然后,針對一加拿大熱采項目的蓋層破壞事件,開展了泥巖蓋層熱-水-應(yīng)力全耦合數(shù)值模擬研究,揭示了熱采環(huán)境下泥巖層的破壞機理及關(guān)鍵影響因素。結(jié)果表明,熱采環(huán)境中泥巖層應(yīng)力演化主要受熱增壓影響;孔隙壓力遠高于注汽壓力,峰值位于孔隙水最大熱壓力系數(shù)所對應(yīng)的溫度附近;孔隙壓力峰值附近巖層可能發(fā)生拉伸破壞和剪切破壞。熱采油藏合理注汽方案的制定必須充分考慮泥巖層的熱-水-應(yīng)力耦合效應(yīng)。
[Abstract]:It is helpful to understand the stress evolution law and failure mechanism of mudstone bed in thermal recovery environment, which is helpful to solve the problem of caprock fracture and intercalation barrier effectively in the process of heavy oil reservoir steam injection. Firstly, the heat transfer and pressurization mechanism of the mudstone layer in thermal oil recovery reservoir is quantitatively studied theoretically, and the different stress evolution laws and failure modes of the mudstone layer under the condition of varying temperature and pressure are analyzed. In view of the caprock failure event of a Canadian thermal mining project, a numerical simulation study on the thermal-water-stress coupling of mudstone caprock is carried out, which reveals the failure mechanism and key influencing factors of mudstone strata under thermal mining environment. The results show that the stress evolution of mudstone in thermal recovery environment is mainly affected by thermal pressure, the pore pressure is much higher than steam injection pressure, and the peak value lies near the temperature corresponding to the maximum thermal pressure coefficient of pore water. Tensile failure and shear failure may occur near the peak pore pressure. The thermal-water-stress coupling effect of mudstone must be taken into account in the formulation of rational steam injection scheme for thermal recovery reservoir.
【作者單位】： 中國石油大學(xué)(華東)石油工程學(xué)院;山東大學(xué)(威海)機電與信息工程學(xué)院;
【基金】：國家自然科學(xué)基金(51304230) 中央高校基本科研業(yè)務(wù)費專項(14CX02104A) 山西省重點實驗室基金(14-080100-03)
【分類號】：TE357.44

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