Mechanical specific energy drilling system

摘要

A mechanical specific energy downhole drilling assembly having a bottomhole assembly including drill pipe and a drill bit, a weight on bit and torque sub for sensing torque, weight on bit and revolutions per minute of the drill bit; a command and control sub for receiving input from the weight on bit and torque sub for determining instantaneous mechanical specific energy of the downhole drilling assembly and an anti-stall tool responsive to real time mechanical specific energy information from the command and control sub to adjust the weight on the drill bit to maximize rate of penetration of the drill bit.

主权项

1. A downhole drilling assembly comprising;
a bottom hole assembly including drill pipe and a drill bit; downhole means for sensing torque at the drill bit, weight on bit and revolutions per minute of the drill bit; a computerized computation means positioned downhole as a component of the bottom hole assembly for receiving input from the means for sensing and determining instantaneous mechanical specific energy of the downhole drilling assembly; and a controlled weight modification tool positioned downhole as a component of the bottom hole assembly responsive to a signal from the computerized computation means based upon real time mechanical specific energy to adjust the weight on bit to maximize rate of penetration of the drill bit.