Choke Control Tuned by Flow Coefficient for Controlled Pressure Drilling

摘要

A computerized control is used in controlling a choke when drilling a wellbore with a drilling system. The computerized control obtains a measured value of a parameter in the drilling system and controls the parameter in the drilling system using the choke. The computerized control obtains indications of an error between a set point of the parameter and the measured value of the parameter in the drilling system, a flow coefficient character of the choke, and a current position of the choke. Based on these indications, the computerized control then determines a position adjustment for the choke and adjusting the parameter in the drilling system by applying the position adjustment to the choke.

主权项

1. A method, implemented by a computerized control, of drilling a wellbore with a drilling system having a choke, the method comprising:
obtaining, with the computerized control, a measured value of a parameter in the drilling system; controlling, with the computerized control, the parameter in the drilling system using the choke; obtaining, with the computerized control, indications of an error between a set point of the parameter and the measured value of the parameter in the drilling system, a flow coefficient character of the choke, and a current position of the choke; determining, with the computerized control, a position adjustment for the choke based on the indications of the error, the flow coefficient character, and the current position; and adjusting, with the computerized control, the parameter in the drilling system using the choke by applying the position adjustment to the choke.