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我队于一九六一年九月采用班加鉆作为勘探砂矿床的主要手段之一。在黃舖地区砂砾层中,用班加鉆迴轉鉆进方式,套管常常落后或超前不足,在地层压力差、水位差以及操作不当的影响下,促使套管內外岩(矿)心混淆,采取率偏高达150％,甚至200％以上。泵筒是班加鉆采取岩(矿)心的主要王具,通常用直径89毫米的泵筒,閥門张开的最大距离为35至40毫米,因此遇到两軸长度大于35—40毫米的砾石,就无法进入泵筒內。由于泵筒的上下冲击,产生“淘洗”作用,使砂砾层中的細
Our team used Bangalore as one of the main tools for prospecting sand deposits in September 1961. In the gravel layer of Huangpu area, the casing is often behind or underrun by means of drilling and boring by means of drilling and boring. Under the influence of formation pressure difference, water level difference and improper operation, the core of the casing is confused, Take rate as high as 150%, or even 200% or more. Pump cylinder is the king of rock mining mining (mine) the heart of the king, usually with a diameter of 89 mm pump cylinder, the valve is open to the maximum distance of 35 to 40 mm, so the two shafts meet the length of 35-40 mm Gravel, you can not enter the pump cylinder. As the pump cylinder up and down the impact, resulting in “panning” role in gravel layer so fine