E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13
E21B 17/04 (2006.01)
Patent
CA 1112637
TITLE: A DOWNHOLE WEIGHT CONTROL DEVICE FOR IMPACT ROCK DRILLING TOOL ABSTRACT OF THE DISCLOSURE A downhole weight control device is described for connecting to the upper end of a downhole, pneumatically- operated, impact rock drilling tool for applying a downward force on the tool sufficient to maintain the drill bit in the closed working position. The weight control device has a piston member that has an effective area related to the sur- face area of the hammer piston in the drilling tool to effec- tively counterbalance an upward force of the tool tending to lift the tool. The control device also prevents exerting excessive weight on the drill bit. The control device has means for automatically decreasing the working pressure should the drill string be fed for a period of time at a rate greater than the penetration rate of the tool.
339262
Adcock Gerald L.
George H. Riches And Associates
LandOfFree
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