The final installment from this series takes a look at tools and accessories.
Important operational considerations such as distance from the bit to the steering tool, bend angle, fluid volume, off-bottom pressure, stall pressure, operating pressure (about 100 psi less than stall pressure) and differential pressure (operating pressure minus off-bottom pressure) are important for maximizing tracking accuracy, penetration rates and tooling life. Manufacturers should be consulted for advice on these matters. An operational test report should be provided with each mud motor upon delivery from the manufacturer, and a torque/flow chart and a build rate chart also should be requested to determine the optimal operating parameters of the mud motor. It is important to have functional fluid flow and pressure gauges when drilling with any tooling, but it is essential when drilling with mud motors.