发明名称 DIRECTIONAL DRILLING SYSTEM AND APPARATUS
摘要 The apparatus, in one embodiment, has guide housing (113) with a shaft (101) extending through the guide housing (113) with a drill bit (105) coupled to its forward end (101F). The shaft (101) may be moved to a forward drilling position or to a rearward shifting position relative to the guide housing (113). A cam is located inside of the guide housing. A cam follower (131) is coupled to the shaft. In the shifting mode, the cam follower (131) is disengaged from the cam. A clutch (261) is provided for coupling the cam to the shaft when the shaft is in the shifting position such that the cam follower may be rotated with the shaft relative to the cam to allow the cam follower to engage the cam when the shaft is moved to the forward drilling position. In the forward drilling position of the shaft, the clutch releases the cam from the shaft and the cam follower engages the cam to allow straight drilling to occur or to cause the axis of said guide housing to shift relative to the axis of the shaft to cause the direction of drilling by the shaft and drill bit to change.
申请公布号 WO9964712(A8) 申请公布日期 2000.04.06
申请号 WO1999US12574 申请日期 1999.06.04
申请人 WEBB, CHARLES, T. 发明人 WEBB, CHARLES, T.;CHANDLER, ROY, L.
分类号 E21B7/04;E21B7/06;E21B47/022 主分类号 E21B7/04
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