本文選題：有限元 + 水合物�。� 參考：《天然氣工業(yè)》2017年12期

【摘要】：為了解決固態(tài)流化法開采海洋非成巖天然氣水合物(以下簡稱水合物)采空區(qū)安全性如何評估的問題,以中國南海神狐海域的水合物藏為例,根據(jù)水合物射流破碎流化開采工藝及流程,基于圣維南原理建立了采空區(qū)有限元模型并進(jìn)行了網(wǎng)格精度驗證,采用研究區(qū)水合物藏的物性參數(shù)和力學(xué)特征參數(shù),模擬分析了垂直和水平采空區(qū)的穩(wěn)定性問題,并探索了海洋非成巖水合物穩(wěn)定層采空區(qū)的安全評價方法。結(jié)果表明:(1)基于圣維南原理建立的海底采空區(qū)有限元分析模型能夠保證計算精度且計算工作量不大;(2)垂直采空區(qū)最大偏應(yīng)力隨采空區(qū)直徑的增加呈現(xiàn)出先快速增加后緩慢增加的趨勢,最大應(yīng)變則隨采空區(qū)直徑的增加而呈線性增加;(3)垂直采空區(qū)的安全問題主要受到應(yīng)力水平的控制,采空區(qū)直徑不宜超過800 mm;(4)水平采空區(qū)最大偏應(yīng)力和最大應(yīng)變均隨水平采空區(qū)直徑的增加而呈現(xiàn)出單調(diào)增加的趨勢。結(jié)論認(rèn)為:垂直采空區(qū)的直徑可以達(dá)到比較大的臨界值,其安全性主要屬于采空區(qū)井壁強(qiáng)度問題;而水平采空區(qū)的臨界直徑值則比較小,其安全性主要屬于采空區(qū)穩(wěn)定性問題。
[Abstract]:In order to solve the problem of how to evaluate the safety of mining goaf of marine non-diagenetic gas hydrate (hereinafter referred to as hydrate) by solid-state fluidization method, the gas hydrate reservoir in Shenhu area of South China Sea is taken as an example. According to the technology and process of hydrate jet fluidization mining, the finite element model of goaf is established based on the principle of San Venant, and the grid accuracy is verified. The physical and mechanical parameters of hydrate reservoir in the studied area are adopted. The stability of the vertical and horizontal goaf is simulated and analyzed, and the safety evaluation method of the goaf in the stable layer of marine non-diagenetic hydrate is explored. The results show that: 1) the finite element analysis model of undersea goaf based on the principle of Saint Venant can guarantee the calculation accuracy and the calculation work is not big. 2) the maximum deflection stress of vertical goaf increases with the increase of the diameter of the goaf. The tendency to increase slowly after adding, The maximum strain increases linearly with the diameter of the goaf. (3) the safety of the vertical goaf is mainly controlled by the stress level. The maximum deflection stress and the maximum strain of the horizontal goaf increase monotonously with the increase of the diameter of the horizontal goaf. The conclusion is that the diameter of vertical goaf can reach the critical value, and its safety mainly belongs to the problem of wellbore strength in goaf, while the critical diameter of horizontal goaf is relatively small, and its safety mainly belongs to the stability of goaf.
【作者單位】： 西南石油大學(xué);中國海洋石油總公司;中海油研究總院;
【基金】：國家重點(diǎn)研發(fā)計劃項目“海洋水合物固態(tài)流化測試新技術(shù)”(編號:2016YFC0304008) 四川省教育廳重點(diǎn)項目(編號:16ZA0069)
【分類號】：TE53

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本文編號：1854257