本文選題：巖石力學(xué) + 正交各向異性�。� 參考：《巖石力學(xué)與工程學(xué)報(bào)》2017年06期

【摘要】：針對(duì)橫觀各向同性地層,基于各向異性材料力學(xué)理論,運(yùn)用應(yīng)力疊加原理和坐標(biāo)變換方法,考慮井筒流體壓力、最大水平主應(yīng)力、最小水平主應(yīng)力和上覆巖層壓力作用,推導(dǎo)橫觀各向同性地層中,水平井沿任意方向鉆進(jìn)時(shí)井壁應(yīng)力場(chǎng)的擬三維解析解。進(jìn)而分析了頁巖和砂巖水平井井壁上任意巖石質(zhì)點(diǎn)3個(gè)主應(yīng)力的分布規(guī)律,分析表明,與地層力學(xué)性質(zhì)各向同性條件相比,力學(xué)性質(zhì)各向異性時(shí),井壁上任意巖石質(zhì)點(diǎn)的第一主應(yīng)力σ_1沒有改變,而第二主應(yīng)力σ_2和第三主應(yīng)力σ_3發(fā)生了改變,巖石力學(xué)性質(zhì)各向異性度越大,主應(yīng)力σ_2和σ_3改變?cè)酱?巖石力學(xué)性質(zhì)高各向異性度增加了井壁可能發(fā)生張性破裂的點(diǎn)數(shù)。研究成果可為橫觀各向同性地層水平井水力裂縫起裂以及井壁穩(wěn)定性分析提供參考。
[Abstract]:In view of transversely isotropic formation, based on anisotropic material mechanics theory, stress superposition principle and coordinate transformation method are used to consider the effects of wellbore fluid pressure, maximum horizontal principal stress, minimum horizontal principal stress and overlying rock pressure. The quasi three dimensional analytical solution of borehole stress field in horizontal well drilling along any direction in transversely isotropic formation is derived. Furthermore, the distribution of three principal stresses of arbitrary rock particles on the sidewall of shale and sandstone horizontal wells is analyzed. The analysis shows that, compared with the isotropic conditions of formation mechanical properties, the mechanical properties are anisotropic. The first principal stress 蟽 _ 1 of any rock particle on the sidewall has not changed, while the second principal stress 蟽 _ 2 and the third principal stress 蟽 _ 3 have been changed. The greater the anisotropy of rock mechanical properties, the greater the change of principal stress 蟽 _ 2 and 蟽 _ 3. The high anisotropy of rock mechanical properties increases the number of possible tensile fractures. The results can provide a reference for hydraulic fracture initiation and sidewall stability analysis of horizontal wells in transversely isotropic formations.
【作者單位】： 西南石油大學(xué)油氣藏地質(zhì)及開發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：中國(guó)石化石油勘探開發(fā)研究院頁巖油氣富集機(jī)理與有效開發(fā)國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金(G5800 15 ZS WX042)~~
【分類號(hào)】：TE243

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1 馬景槐;考慮巖層各向異性性質(zhì)的井眼穩(wěn)定性分析[J];新疆石油學(xué)院學(xué)報(bào);2001年01期

2 ;[J];;年期

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本文編號(hào)：2011176