【摘要】：在理論計(jì)算水力壓裂起裂壓力和起裂方向的基礎(chǔ)上,利用應(yīng)力-滲流耦合數(shù)值模擬方法,研究了地應(yīng)力和原生裂隙對(duì)水力壓裂過程中裂紋起裂和擴(kuò)展的影響,得出了起裂壓力和擴(kuò)展壓力隨側(cè)壓系數(shù)的變化趨勢(shì);對(duì)比分析了不含預(yù)制裂紋和含預(yù)制裂紋壓裂模型的起裂壓力和方向;探討了含裂紋模型起裂轉(zhuǎn)向的臨界應(yīng)力條件;最后,通過應(yīng)力分析闡述了地應(yīng)力和原生裂隙對(duì)水力壓裂起裂的影響機(jī)理。
[Abstract]:Based on the theoretical calculation of the initiation pressure and direction of hydraulic fracturing, the effects of in-situ stress and primary fracture on crack initiation and propagation during hydraulic fracturing are studied by means of stress-seepage coupling numerical simulation method, and the stress-seepage coupling numerical simulation method is used to study the influence of in-situ stress and primary fracture on crack initiation and propagation. The variation trend of crack initiation pressure and expansion pressure with lateral pressure coefficient is obtained. The initiation pressure and direction of the fracture models without and without prefabricated cracks are compared and analyzed, and the critical stress conditions of the crack initiation steering in the model with cracks are discussed. Finally, the influence mechanism of in-situ stress and primary fracture on hydraulic fracturing initiation is expounded by stress analysis.
【作者單位】： 中國(guó)礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院;重慶市能源投資集團(tuán)科技有限責(zé)任公司;煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：重慶市前沿與應(yīng)用基礎(chǔ)研究資助項(xiàng)目(cstc2014jcyjjq0020);重慶市前沿與應(yīng)用基礎(chǔ)研究資助項(xiàng)目(cstc2015jcyj A1148)
【分類號(hào)】：TD712.6

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