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A method of controlling standpipe pressure in a drilling operation can include comparing a measured standpipe pressure to a desired standpipe pressure, and automatically adjusting a choke in response to the comparing, thereby reducing a difference between the measured standpipe pressure and the desi

A method of controlling standpipe pressure in a drilling operation can include comparing a measured standpipe pressure to a desired standpipe pressure, and automatically adjusting a choke in response to the comparing, thereby reducing a difference between the measured standpipe pressure and the desired standpipe pressure. A standpipe pressure control system for use in a drilling operation can include a controller which outputs an annulus pressure setpoint based on a comparison of a measured standpipe pressure to a desired standpipe pressure, and a choke which is automatically adjusted in response to the annulus pressure setpoint. A well system can include a standpipe line connected to a drill string in a wellbore, a sensor which measures pressure in the standpipe line, and a controller which outputs an annulus pressure setpoint based at least in part on a difference between the measured pressure and a desired standpipe pressure.

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1. A method of controlling standpipe pressure in a drilling operation, the method comprising: comparing a measured standpipe pressure to a desired standpipe pressure while elongating a wellbore;outputting an annulus pressure set point based on the comparing; andautomatically adjusting a choke in res

1. A method of controlling standpipe pressure in a drilling operation, the method comprising: comparing a measured standpipe pressure to a desired standpipe pressure while elongating a wellbore;outputting an annulus pressure set point based on the comparing; andautomatically adjusting a choke in response to the outputting, thereby reducing a difference between the measured standpipe pressure and the desired standpipe pressure. 2. The method of claim 1, wherein the choke receives fluid while a rig pump pumps the fluid through a drill string. 3. The method of claim 1, wherein automatically adjusting the choke further comprises a controller outputting an annulus pressure setpoint. 4. The method of claim 3, wherein automatically adjusting the choke further comprises comparing a measured annulus pressure to the annulus pressure setpoint, and automatically adjusting the choke so that a difference between the measured annulus pressure and the annulus pressure setpoint is reduced. 5. The method of claim 4, wherein comparing the measured annulus pressure to the annulus pressure setpoint is performed at least four times as frequent as comparing the measured standpipe pressure to the desired standpipe pressure. 6. The method of claim 3, wherein the controller comprises a proportional integral differential controller. 7. A standpipe pressure control system for use in a drilling operation, the system comprising: a first controller which outputs an annulus pressure setpoint based on a comparison of a measured standpipe pressure to a desired standpipe pressure; anda choke which is automatically adjusted in response to the annulus pressure setpoint, wherein automatic adjustment of the choke reduces a difference between the measured standpipe pressure and the desired standpipe pressure. 8. The system of claim 7, wherein the choke receives fluid while a rig pump pumps the fluid through a drill string. 9. The system of claim 7, wherein a second controller compares a measured annulus pressure to the annulus pressure setpoint. 10. The system of claim 9, wherein automatic adjustment of the choke reduces a difference between the measured annulus pressure and the annulus pressure setpoint. 11. A standpipe pressure control system for use in a drilling operation, the system comprising: a first controller which outputs an annulus pressure setpoint based on a comparison of a measured standpipe pressure to a desired standpipe pressure; anda choke which is automatically adjusted in response to the annulus pressure setpoint, wherein a second controller compares a measured annulus pressure to the annulus pressure setpoint, and wherein the measured annulus pressure is compared to the annulus pressure setpoint at least four times as frequent as the measured standpipe pressure is compared to the desired standpipe pressure. 12. A standpipe pressure control system for use in a drilling operation, the system comprising: a controller which outputs an annulus pressure setpoint based on a comparison of a measured standpipe pressure to a desired standpipe pressure; anda choke which is automatically adjusted in response to the annulus pressure setpoint, wherein the controller comprises a proportional integral differential controller. 13. A well system, comprising: a standpipe line connected to a drill string in a wellbore;a sensor which measures pressure in the standpipe line;a first controller which outputs an annulus pressure setpoint based at least in part on a difference between the measured pressure and a desired standpipe pressure; anda choke which is automatically adjusted in response to the annulus pressure setpoint, wherein automatic adjustment of the choke reduces the difference between the measured pressure and the desired standpipe pressure. 14. The system of claim 13, wherein a second controller compares a measured annulus pressure to the annulus pressure setpoint. 15. The system of claim 14, wherein automatic adjustment of the choke reduces a difference between the measured annulus pressure and the annulus pressure setpoint. 16. A well system, comprising: a standpipe line connected to a drill string in a wellbore;a sensor which measures pressure in the standpipe line; anda first controller which outputs an annulus pressure setpoint based at least in part on a difference between the measured pressure and a desired standpipe pressure, wherein a second controller compares a measured annulus pressure to the annulus pressure setpoint, and wherein the measured annulus pressure is compared to the annulus pressure setpoint at least four times as frequent as the measured standpipe pressure is compared to the desired standpipe pressure. 17. A well system, comprising: a standpipe line connected to a drill string in a wellbore;a sensor which measures pressure in the standpipe line; anda controller which outputs an annulus pressure setpoint based at least in part on a difference between the measured pressure and a desired standpipe pressure, wherein the controller comprises a proportional integral differential controller.