【摘要】：基于Comsol Multiphysics 5.2和Matlab軟件,構(gòu)建材料參數(shù)服從Weibull分布的非均質(zhì)花崗巖鉆井,分析了3000m和4000m埋深下,不同溫度對(duì)花崗巖蠕變特性的影響。實(shí)驗(yàn)結(jié)果表明:在相同埋深下,當(dāng)溫度在300℃~480℃區(qū)間內(nèi),花崗巖鉆井圍巖穩(wěn)態(tài)蠕變率基本保持不變,當(dāng)溫度超過(guò)480℃~500℃時(shí),穩(wěn)態(tài)蠕變率明顯增大,即溫度閾值為480℃~500℃。在軸壓、圍壓一定的情況下,隨著溫度升高,鉆井圍巖初始蠕變應(yīng)變值明顯增大,但在不同埋深下初始蠕變應(yīng)變值基本相同,體現(xiàn)為熱彈性應(yīng)變。在相同埋深下,花崗巖鉆井沿其徑向蠕變應(yīng)變,受溫度影響顯著,隨著溫度的升高,鉆井圍巖的蠕變應(yīng)變?cè)龃�。�?000,4000 m埋深下,高溫對(duì)花崗巖鉆井圍巖蠕變性能影響顯著,在500℃時(shí)隨時(shí)間推移,鉆井圍巖蠕變應(yīng)變明顯加快,即鉆井圍巖高溫失穩(wěn)閾值在500℃左右。高溫使花崗巖力學(xué)性能弱化,在花崗巖內(nèi)部造成損傷,隨著溫度的升高損傷不斷積累,在500℃左右發(fā)生突變,致使鉆井圍巖失穩(wěn)破壞。
[Abstract]:Based on Comsol Multiphysics 5.2 and Matlab software, heterogeneous granite drilling with material parameters subject to Weibull distribution is constructed. The effects of different temperatures on creep characteristics of granite at 3000m and 4000m buried depths are analyzed. The experimental results show that when the temperature is in the range of 300 鈩，

本文編號(hào)：2496491