發(fā)布時(shí)間：2018-01-19 12:24

  本文關(guān)鍵詞： 粒子射流 沖擊破巖 SPH方法 室內(nèi)實(shí)驗(yàn)　出處：《爆炸與沖擊》2017年03期 　論文類型：期刊論文

【摘要】：鉆井液中加入體積分?jǐn)?shù)為1%~3%的鋼質(zhì)粒子在鉆頭噴嘴處高速噴出沖擊巖石,實(shí)現(xiàn)了粒子射流沖擊和鉆頭機(jī)械聯(lián)合破巖,有效提高了破巖效率。利用瞬態(tài)非線性動(dòng)力學(xué)有限元模擬軟件,基于光滑粒子流體動(dòng)力學(xué)(smoothed particle hydrodynamics,SPH)方法,考慮流體對(duì)粒子射流沖擊的影響,建立了粒子射流沖擊破巖的物理模型,獲得了粒子射流參數(shù)對(duì)破巖體積的影響規(guī)律,進(jìn)行了室內(nèi)實(shí)驗(yàn)驗(yàn)證,驗(yàn)證了SPH方法的有效性。結(jié)果表明:粒子射流沖擊巖石表面形成規(guī)則的V型沖擊坑;同條件下粒子射流破巖體積是水射流破巖體積的2~4倍;隨著粒子射流沖蝕時(shí)間的增加,粒子射流破巖體積不斷增加,但破巖效率降低;粒子射流壓力大于10 MPa后,粒子射流破巖效率迅速增大;噴射角度大于6°后,破巖效率迅速減小。
[Abstract]:In the drilling fluid, steel particles with volume fraction of 1% and 3% are added to the drilling fluid, and the impact rock is ejected at high speed at the bit nozzle, which realizes the particle jet impingement and the rock breaking combined with the drill bit mechanism. The efficiency of rock breaking is improved effectively. The transient nonlinear dynamic finite element simulation software is used. Based on smooth particle hydrodynamics smoothed particle hydrodynamics method, the effect of fluid on particle jet impingement is considered. The physical model of particle jet impingement on rock burst is established, and the influence of particle jet parameters on rock breaking volume is obtained, which is verified by laboratory experiments. The effectiveness of the SPH method is verified. The results show that the particle jet impinges on the rock surface to form regular V-shaped impact pits. Under the same conditions, the rock breaking volume of particle jet is 2 ~ 4 times of that of water jet. With the increase of the erosion time of particle jet, the rock breaking volume of particle jet increases continuously, but the rock breaking efficiency decreases. When the pressure of particle jet is more than 10 MPa, the rock breaking efficiency of particle jet increases rapidly. When the jet angle is greater than 6 擄, the rock breaking efficiency decreases rapidly.
【作者單位】： 中國石油大學(xué)(華東)石油工程學(xué)院;中國石油大學(xué)(華東)科學(xué)技術(shù)研究院;中海油能源發(fā)展股份有限公司安全環(huán)保分公司;
【基金】：中石油科學(xué)研究與技術(shù)開發(fā)項(xiàng)目(2015F-1801) 第58批中國博士后基金項(xiàng)目(2015M582167) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)項(xiàng)目(16CS02061A) 山東省自然科學(xué)基金項(xiàng)目(ZR2016EL10) 青島市應(yīng)用基礎(chǔ)研究項(xiàng)目(16-5-1-37-jch)
【分類號(hào)】：O358
【正文快照】： 粒子沖擊鉆井技術(shù)可以有效提高深井硬地層鉆井速度,通過井下鉆頭噴嘴噴出的高頻、高速鋼質(zhì)粒子沖擊巖石,粒子沖擊時(shí)間極短,接觸面積極小,產(chǎn)生的瞬時(shí)接觸應(yīng)力極大,改變了常規(guī)鉆頭的破巖方式,極大提高了能量利用率[1-4]。徐依吉等[5-6]分析得出粒子沖擊破巖過程是涉及多因素的非

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