This paper describes a state-of-the-art trip monitor program which makes drilling safer and more efficient. The trip monitor program computes drillstring friction while tripping. The friction calculation is insensitive to the effects of wellbore geometry, buoyancy and BHA used. Volumes of mud and steel transferred into and out of the hole are accurately monitored to detect kicks and losses. The program is flexible enough to work automatically with all fill-up techniques. The program calculates swab and surge pressures in real time and uses pore pressure and fracture gradient information to calculate safe tripping speeds. A rig floor CRT display delivers answers to the driller which he can read at a glance.

This paper outlines the different features of the trip monitor program and the theory behind them. In particular, the friction analysis is discussed in detail to include the influence of the block sheaves and an imperfect description of the pipe geometry on the answer. Field examples are presented to demonstrate the usefulness of the method.

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