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63年年初,南非Klersdorp地区、Buffelsfontein地方矿山企业,分别以31天掘382米和以100天掘974米直径为6.7米的通风井,平均每循环进尺为2.11米。一个循环的持续时间为4小时16分。460个循环共掘974米,创造了世界井筒掘进的两项纪录。然而,几年来创造纪录所获得的经验,反映在一般井筒掘进中,高速稳定进尺方面,而且保持了掘进的基本费用不超过一定范围。在这一年当中,南非的金矿有两项井筒掘
At the beginning of 63 year, local mining companies in Buffelsfontein, Klersdorp, South Africa, dug 382 meters in 31 days and 974 meters in diameter, respectively, with a diameter of 6.7 meters. The average drilling footage per cycle was 2.11 meters. The duration of one cycle is 4 hours and 16 minutes. With a total circulation of 974 meters in 460 cycles, it has created two records for well borehole drilling in the world. However, the experience gained over the past few years in creating records is reflected in the general wellbore driving and high-speed stability in terms of footage and the basic cost of driving a tunnel is maintained within a certain range. During the year, South Africa’s gold mine had two wellbores