中文摘要：

柴油机尾气钻井是利用柴油机尾气作为循环介质的一种气体钻井。对钻井常用柴油机Z12V190的尾气成分、排量、含氧量、尾气钻井最小注气量进行计算分析。结果表明：柴油机尾气排量随尾气含氧量增加而增加，可通过增加吸入阻力和负载降低含氧量；柴油机尾气钻井最小注气量随关键点压力增加而增加；尾气含氧量必须低于14％才能安全钻进；因受尾气排量限制，柴油机尾气钻井只适用于低压钻井，即使3台柴油机同时工作所提供的最大尾气排量也仅能满足关键点压力为4MPa时的最小注气量要求，当只有2台或1台柴油机工作时，其钻井压力会更低，甚至不到1MPa。

英文摘要：

Diesel engine tail gas drilling is a kind of gas drilling with engine tail gas as circulating medium. The Z12VI90 diesel engine tail gas composition, exhaust rate, oxygen content and minimum gas injection rate of tail gas drilling were analyzed and calculated. The results show that the diesel engine tail gas exhaust rate increases with the oxygen content increasing, and the oxygen content in tail gas can be reduced by increasing suction resistance and diesel engine load. The minimum gas injection rate increases with the pressure at key point increasing. The oxygen content in tail gas must be below 14% in tail gas drilling. The diesel engine tail gas drilling applies only to low pressure condition because of the limited diesel tail gas rate. When all the three diesel engines are working, the total tail gas rate just reaches the minimum gas injection rate at 4 MPa, but when one or two diesel engines are working, the tail gas rate is only suit to the minimum gas injection rate at 1 MPa.