發(fā)布時(shí)間：2018-09-08 10:12

【摘要】：泥巖作為油氣儲(chǔ)層常見復(fù)雜介質(zhì),深部高溫、高壓環(huán)境下蠕變力學(xué)特性異常復(fù)雜,是引起套管損傷破壞的重要因素。以深部油氣藏工程含膏質(zhì)泥巖為研究對(duì)象;分別開展了溫度為130℃、圍壓為30 MPa作用下三軸壓縮和不同應(yīng)力水平的三軸蠕變?cè)囼?yàn),結(jié)果表明,該泥巖呈非均質(zhì)性不明顯、具有較大塑性壓縮和延性擴(kuò)容變形、峰值強(qiáng)度略低等軟巖力學(xué)特性;且軸向和側(cè)向峰值應(yīng)變達(dá)1.5%,峰值強(qiáng)度為74 MPa。泥巖力學(xué)特性表現(xiàn)出明顯的時(shí)間效應(yīng),蠕變應(yīng)力閥值較低;應(yīng)力和持時(shí)對(duì)蠕變特性存在顯著影響,低應(yīng)力、長(zhǎng)時(shí)間作用下泥巖亦呈現(xiàn)顯著的穩(wěn)態(tài)蠕變和加速蠕變破壞;且加速蠕變起始時(shí)間隨應(yīng)力增加呈指數(shù)降低關(guān)系;探討了泥巖強(qiáng)度損傷和加速蠕變特性,認(rèn)為泥巖內(nèi)部蠕變損傷變量可用指數(shù)函數(shù)予以描述,且加速蠕變變形為應(yīng)力與時(shí)間的二元指數(shù)函數(shù)。相關(guān)成果旨在為深部泥巖油氣藏套管工程長(zhǎng)期穩(wěn)定分析及蠕變模型構(gòu)建提供可靠的依據(jù)。
[Abstract]:As a common complex medium in oil and gas reservoir, mudstone is an important factor that causes casing damage and failure due to the unusual complexity of creep mechanical properties in deep high temperature and high pressure environments. Taking the gypsum mudstone of deep oil and gas reservoir engineering as the research object, triaxial creep tests with temperature of 130 鈩，

本文編號(hào)：2230217