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我队703机在某矿区施工的ZK7号孔，设计为直孔，孔深500米。采用孔底喷射式反循环（以下简称反循环）钢粒钻进。开孔为第四纪黄土，钻到13.72米见基岩，直到终孔，岩石均为闪长岩，岩性均一完整。从14.79米用钢砂单管正循环钻进。到孔深158.99米时，测得150米处孔斜超差。为控制孔斜，从158.99米开始采取一次正循环和一次反循环相间钻进的措施。并限制正循环回次进尺在两米以内，直打到254.20米。在此孔段内，正循环及反循环分别钻进21回次及24回次；进尺分别为37.60米及55.94米。两者比较，小时效率反循环比正循环提高39％，达到了控制孔斜的目的。从254.20米至468.92米，反循环及正循
I team 703 machine in a mining ZK7 No. hole design, straight hole design, hole depth 500 meters. Bottom hole jet reverse circulation (hereinafter referred to as reverse circulation) steel drilling. Open to Quaternary loess, drill to 13.72 meters to see the bedrock, until the final hole, the rocks are diorite, lithology are complete and complete. From 14.79 meters with steel sand is a single cycle of drilling. To the hole depth of 158.99 meters, 150 meters measured hole oblique tolerance. To control the hole inclination, from 158.99 meters to take a positive cycle and a counter-clockwise drilling measures. And limit the cycle is back to the time within two meters, straight to 254.20 meters. In this hole segment, positive circulation and reverse circulation were drilled 21 times and 24 times respectively; footage were 37.60 meters and 55.94 meters respectively. For both, the hourly efficiency reverse cycle was 39% more positive than the positive cycle, achieving the purpose of controlling the slope of the hole. From 254.20 meters to 468.92 meters, reverse circulation and positive circulation