Automatic standpipe pressure control in drilling
First Claim
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; and
automatically adjusting a choke in response to the outputting, thereby reducing a difference between the measured standpipe pressure and the desired standpipe pressure.
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Accused Products
Abstract
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.
213 Citations
17 Claims
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1. A method of controlling standpipe pressure in a drilling operation, the method comprising:
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comparing a measured standpipe pressure to a desired standpipe pressure while elongating a wellbore; outputting an annulus pressure set point based on the comparing; and automatically adjusting a choke in response to the outputting, thereby reducing a difference between the measured standpipe pressure and the desired standpipe pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A standpipe pressure control system for use in a drilling operation, the system comprising:
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a first 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, wherein automatic adjustment of the choke reduces a difference between the measured standpipe pressure and the desired standpipe pressure. - View Dependent Claims (8, 9, 10)
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11. A standpipe pressure control system for use in a drilling operation, the system comprising:
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a first 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, 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.
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12. A standpipe pressure control system for use in a drilling operation, the system comprising:
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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, wherein the controller comprises a proportional integral differential controller.
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13. A well system, comprising:
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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; and a 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. - View Dependent Claims (14, 15)
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16. A well system, comprising:
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a standpipe line connected to a drill string in a wellbore; a sensor which measures pressure in the standpipe line; and 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, 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.
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17. A well system, comprising:
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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, wherein the controller comprises a proportional integral differential controller.
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Specification