Drilling fluid technology in ice sheets: Hydrostatic pressure and borehole closure considerations
Drilling fluid technology in ice sheets: Hydrostatic pressure and borehole closure considerations
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冰盖钻井液技术：静水压力和钻孔封闭考虑因素
DOI：
10.1016/j.coldregions.2013.10.012
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发表时间：
2014-02
影响因子：
4.1
通讯作者：
Youhong Sun
中科院分区：
文献类型：
--
作者：
Dahui Yu;Lili Han;Junjie Han;Youhong Sun
在冰盖上钻深钻孔需要用液体填充孔，以补偿冰覆盖层的压力。密度是最重要的钻井液性质，因此液柱的静水压力应足以防止井眼闭合。然而，由于冰川上部含有大量的空气包裹体，雪-雪带的密度远小于其它地层，且流体和冰的膨胀系数和压缩系数相差很大，因此根本不可能防止钻孔闭合。这就是为什么在所有帐户有部分在钻孔中，冰的压力高于流体的压力。冰深钻井技术的主要思想之一是通过控制钻井液密度来限制闭合率。首先，建议选择压力平衡的深度和在钻孔中的平均温度下的平均流体密度。然后，可以估计井眼壁处的静水压力和压差。最后，预测了负压差段的直径变化，并与最大安全值进行了比较。该方法允许为混凝土钻孔现场选择正确的流体密度和表面以下的流体水平，并确保在冰盖中无事故钻孔。
The drilling of deep boreholes in ice sheets requires that the hole is filled by a liquid to compensate the ice-overburden pressure. Density is the most important drilling fluid property, so the hydrostatic pressure of the fluid column should be sufficient to prevent closure of the borehole. However, it is impossible to prevent borehole closure at all, because the upper part of glaciers contains a lot of air inclusions and the density of snow–firn zone is much less than the rest stratum, and the expansion coefficient and the compressibility of fluids and ice are rather different. That is why at all accounts there are parts in the borehole, where the ice pressure is higher than the pressure of fluid. One of the main ideas of ice deep drilling technology is the limitation of the closure rate by controlling the density of the drilling fluid. First, it is proposed to choose the depth of the pressure equilibrium and the average fluid density at average temperature in the borehole. Then, the hydrostatic pressure and pressure difference at the borehole walls can be estimated. Finally, the diameter changes in the interval with negative pressure difference are predicted and compared with maximal safety values. This method allows to choose the correct fluid density and the fluid level below surface for the concrete drilling site and to ensure accident-free drilling in ice sheets.
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DOI：
--
发表时间：
2002-03
期刊：
Memoirs of National Institute of Polar Research. Special issue
影响因子：
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作者：
Fujii;Yoshiyuki;Azuma;Nobuhiko;Tanaka;Yoichi;Nakayama;Yoshiki;Kameda;Takao;Shinbori;Kunio;Katagiri;Kazuo;Fujita;Shuji;Takahashi;Akiyoshi;Kawada;Motoyama;Hideaki;Narita;Hideki;Kamiyama;Kokichi;Furukawa;Teruo;Shuhei;Shoji;Hitoshi;Enomoto;Hiroyuki;Saitoh;Takeshi;Miyahara;Morihiro;Naruse;Renji;Hondoh;Takeo;Shiraiwa;Takayuki;Yokoyama;Kotaro;Ageta;Yutaka;Saito;Takashi;Watanabe;Okitsugu
通讯作者：
Fujii;Yoshiyuki;Azuma;Nobuhiko;Tanaka;Yoichi;Nakayama;Yoshiki;Kameda;Takao;Shinbori;Kunio;Katagiri;Kazuo;Fujita;Shuji;Takahashi;Akiyoshi;Kawada;Motoyama;Hideaki;Narita;Hideki;Kamiyama;Kokichi;Furukawa;Teruo;Shuhei;Shoji;Hitoshi;Enomoto;Hiroyuki;Saitoh;Takeshi;Miyahara;Morihiro;Naruse;Renji;Hondoh;Takeo;Shiraiwa;Takayuki;Yokoyama;Kotaro;Ageta;Yutaka;Saito;Takashi;Watanabe;Okitsugu
影响因子：
25.2
作者：
W. Paterson
通讯作者：
W. Paterson
影响因子：
0.8
作者：
Anders K. Orvin
通讯作者：
Anders K. Orvin
影响因子：
2.9
作者：
P. Talalay;R. Hooke
通讯作者：
P. Talalay;R. Hooke
DOI：
10.2307/1551118
发表时间：
1981-01
期刊：
Arctic and alpine research
影响因子：
--
作者：
R. Armstrong;W. Paterson
通讯作者：
R. Armstrong;W. Paterson