超前侧喷绳索取心钻头的研制

Design of advanced lateral jet wire-line coring bit

为了解决破碎等复杂地层取心率低的问题,在普通孕镶金刚石钻头的基础上,设计了超前侧喷绳索取心钻头,并进行了野外现场钻进试验。该钻头由含侧向超前水眼的常规钻头与超前齿两部分组成现场试验表明:超前侧喷绳索取心钻头能够实现破碎地层等难取心地层的正常钻进,其实验孔段总取心率达94.1%,大幅度提高了岩(矿)心的采取率;所获岩(矿)心则相对比较完整,基本保持了岩(矿)心原状。

Contraposing the problenis of low coring rate in fractured lonnalion and other complex formations,advanced lateral jet wire-line eoring diamond bit has been designed on the foundation of common impregnated diamond bit,and then it has been put into the field drilling lest.This kind of bits is composed of common bil part with Lateral advanced water nozzles and advanced teeth part.The tests show that advanced lateral jet wireline coring bits work very well in above-mentioned complex formations.The total coring recovery rate at the trial hole is greatly increased,which can reach at 94.1%;and the gathering rock(ore) core mostly remain the native stale and relatively complete,which means the rock(ore) core erosion from drilling fluid have been stopped.