本文選題：高地應(yīng)力 + 損傷尺寸��； 參考：《科學(xué)技術(shù)與工程》2017年34期

【摘要】：在深部高地應(yīng)力地層中取心,巖心層裂(餅化)是一種常見(jiàn)的工程現(xiàn)象。巖心層裂和巖體的物性、力學(xué)性質(zhì)以及原地應(yīng)力密切相關(guān)。為研究鉆井取心過(guò)程中巖心層裂現(xiàn)象的機(jī)理,結(jié)合川西南部地區(qū)A井和B井取心過(guò)程中的巖心層裂現(xiàn)象,考慮巖石礦物組分與巖石脆性指數(shù)的關(guān)系,基于應(yīng)力集中的非均勻巖石拉伸破壞模型,給出了巖心層裂現(xiàn)象產(chǎn)生的判據(jù),采用理論計(jì)算對(duì)餅化現(xiàn)象進(jìn)行了驗(yàn)證。研究結(jié)果表明:脆性礦物含量越高,巖石脆性越強(qiáng),越易生成裂縫;巖心套取是一個(gè)卸載水平方向最大主應(yīng)力的過(guò)程,卸載速度越快,損傷處的附加拉應(yīng)力越大,且對(duì)應(yīng)被激活損傷的尺寸就越小,當(dāng)附加拉應(yīng)力大于巖石抗拉強(qiáng)度時(shí),會(huì)出現(xiàn)巖心層裂現(xiàn)象,隨著取心的繼續(xù)此過(guò)程將重復(fù)地發(fā)生下去。
[Abstract]:Core spallation is a common engineering phenomenon in deep high ground stress strata. Core spallation is closely related to physical properties, mechanical properties and in-situ stress of rock mass. In order to study the mechanism of core spallation during coring drilling, the relationship between rock mineral composition and rock brittleness index is considered in combination with the core spallation in well A and well B in southern Sichuan. Based on the tensile failure model of inhomogeneous rock with stress concentration, the criterion of spallation of core is given, and the theoretical calculation is used to verify the phenomenon of pancake. The results show that the higher the content of brittle minerals, the stronger the brittleness of rock and the easier it is to form cracks, and the higher the unloading speed is, the greater the additional tensile stress is at the damage site. When the additional tensile stress is greater than the rock tensile strength, the core spallation will occur, and this process will be repeated as the coring continues.
【作者單位】： 西南石油大學(xué)油氣藏地質(zhì)及開(kāi)發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【分類號(hào)】：P634

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本文編號(hào)：1795867