Theory calculation and testing of air injection parameters in ice core drilling with air reverse circulation
Theory calculation and testing of air injection parameters in ice core drilling with air reverse circulation
复制标题
空气反循环冰芯钻进注空气参数理论计算与试验
DOI：
10.1016/j.polar.2018.06.005
复制
发表时间：
2018-09
期刊：
影响因子：
1.8
通讯作者：
Zhao Qi
中科院分区：
文献类型：
--
作者：
Cao Pinlu;Liu Miaomiao;Chen Zhuo;Chen Baoyi;Zhao Qi
空气反循环钻进在防止空气循环漏失、提高井壁稳定性、提高机械钻速等方面具有诸多优势，被认为是冰芯钻探，特别是冰钻最有前途的技术之一。该技术的有效性取决于是否可以通过钻具的中心通道将冰屑和冰芯输送到地面。为了确定满足连续返回冰芯和冰屑所需的气体体积流量，研究了估算喷射压力的数学模型。通过一系列的实验，测试了不同尺寸的冰芯和不同间隙的冰屑在管内移动时所需的实际风速。根据计算和试验结果，确定了空气反循环冰芯钻进不同井深的最小空气量要求。对于深度为1000 m、直径为134 mm的钻孔，输送直径为60 mm、长度为250 mm的冰屑和冰芯时，标准大气条件下空气的体积流量和压力至少为6.27 m3/min和0.70 MPa。
Drilling with air reverse circulation is considered one of the most promising technologies in ice core drilling, especially in firn-ice drilling, as it has many advantages in preventing air circulation loss, improving stability of the borehole, and promoting penetration rate. The effectiveness of this technology depends on whether or not the ice chips and cores can be conveyed to the surface through the central channel of the drill tool. In order to determine the adequate volume flow rate of the gas needed to satisfy the demand for continuous return of the ice cores and chips, a mathematical model to evaluate the injection pressure was studied. A series of experiments were carried out to test the actual air velocity required to move ice cores and ice chips with different sizes and clearances between the ice cores and the inner wall of the pipe. Based on the calculation and testing results, the minimum air volume requirements with different borehole depths in ice core drilling with air reverse circulation were confirmed. For a borehole with depth of 1000 m and diameter of 134 mm, the volume flow rate and pressure of air under standard atmosphere condition are at least 6.27 m3/min and 0.70 MPa to transport ice chips and ice cores with diameter of 60 mm and length of 250 mm.
登录
查看更多内容
潜孔锤反循环钻进中新型控尘钻头的优化设计
影响因子：
2.9
作者：
Cao Pinlu;Chen Yunwang;Liu Miaomiao;Chen Baoyi
通讯作者：
Chen Baoyi
通过持续空运钻屑和岩芯进行快速冰钻：一般概念
影响因子：
1.8
作者：
Wang Rusheng;An Liu;Cao Pinlu;Chen Baoyi;Sysoev Mikhail;Fan Dayou;Talalay Pavel G.;Talalay PG
通讯作者：
Talalay PG
影响因子：
4.1
作者：
A. Whelsky;M. Albert
通讯作者：
A. Whelsky;M. Albert
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
B. Guo;A. Ghalambor
通讯作者：
B. Guo;A. Ghalambor
DOI：
--
发表时间：
2002-03
期刊：
Memoirs of National Institute of Polar Research. Special issue
影响因子：
--
作者：
G. Clow;B. Koci
通讯作者：
G. Clow;B. Koci