Processes and systems for drilling a borehole

摘要

Processes and systems for drilling a borehole wherein a gravitational energy term, a torsional energy term, a hydraulic energy term and a hydromechanical specific energy which is the sum thereof may be determined using real-time data and compared against corresponding setpoints. The hydraulic energy term may include a hydraulic energy reduction factor so as to account for the distance between the fluid nozzle of the drill bit and the rock and may include the kinematic viscosity of drilling fluid. One or more drilling parameters, such as weight on bit, revolutions per minute, drilling fluid flow rate, or combinations thereof, may be adjusted based upon such comparison to approximate the least amount of energy required to destroy and remove a given unit volume of rock. The setpoints may be changed manually or automatically at the direction of the user.

主权项

1. A process for drilling a borehole comprising:
obtaining real-time data necessary to determine a gravitational energy term, a torsional energy term, a hydraulic energy term and a hydromechanical specific energy which is the sum of the gravitational energy term, the torsional energy term and the hydraulic energy term; determining the gravitational energy term, the torsional energy term, the hydraulic energy term and the hydromechanical specific energy based upon such real-time data, wherein the hydraulic energy term includes a hydraulic energy reduction factor so as to account for the distance between a nozzle of a drill bit and rock and the kinematic viscosity of drilling fluid; comparing each of the gravitational energy term, the torsional energy term and the hydraulic energy term against a corresponding setpoint for each term; and adjusting at least one drilling parameter based upon the comparison thereby approximating the least amount of energy required to destroy and remove a given unit volume of rock without sacrificing rate of penetration.