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我队在一个铁矿区开展了人造金刚石钻探的生产试验工作.施工210号孔,开孔方位110°,倾角35°40′,终孔深度188.9米.该孔地层复杂.主要为混合花岗岩,细粒或中粗粒花岗变晶结构,节理发育,破碎而且坚硬.这种岩石约占全孔进尺60%.其次为混合质斜长角闪岩,片状或致密块状构造,与混合花岗岩互层,约占全孔进尺36%.还有斜长绿泥石片岩等.钻孔上部(0～80米)岩层风化破碎,特别是O～30米孔段严重坍塌掉块.30米以下岩性软硬不均,硬度相差悬殊,硬的用人造金刚石钻头钻进,时效只达0.7～1.2米(用针状台金钻进时效低达0.1～0.2米),软的用针状合金钻进,时效可达2～8米,但钻过后有时发生严重坍塌掉块.由于钻孔岩层如此复杂,我们采取了如下几点措施.
Our team carried out the production test of synthetic diamond drilling in an iron mining area with No. 210 hole of 110 ° opening angle of 35 ° 40 ’and final hole depth of 188.9 meters.The hole is mainly composed of mixed granite, Fine-grained or medium-grained granitic crystal structure, the joints developed, broken and hard, which accounted for about 60% of the total footage of the borehole, followed by mixed amphibolite, flaky or compact massive structures, Granite interbeds, accounting for about 36% of the footage, and plagioclase schist etc. The upper part of the boreholes (0 ~ 80m) are weathered and crushed, especially in the section of O ~ 30m. The following lithology, hardness and hardness are not the same, the hardness difference between the hard drill with synthetic diamond, aging only up to 0.7 to 1.2 meters (with needle Taijin drilling aging as low as 0.1 to 0.2 meters), soft acicular Alloy drilling, aging up to 2 to 8 meters, but after drilling sometimes serious collapse of the block off.Because the drilling rock formation is so complicated, we have taken the following measures.