适用于破碎地层的新型单动双管钻具

The application test of the new double-barreled and single-acting coring tool in fractured formation

摘要: 针对极度破碎地层取心率不高问题，设计并制造了一种新型单动双管钻具。该套金刚石单动双管钻具由钻杆接头、单动装置、内管、外管、卡心装置和超前侧喷钻头等组成。通过在云南羊拉矿区试验，能有效地提高破碎地层岩心采取率。

Abstract: Aiming at the problem of low coring recovery rate in extremely fractured formations,the paper designs a new double-barreled and single-acting coring tool,which comprises tool joint,single acting motion,inner pipe,outer pipe,core device and advance bore and lateral jet bit etc.Through the application test in Yangla mine,it can greatly improve the coring recovery rate in extremely fractured formations.