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US 10,481,618 B2Granted
Injection flow controller for water and steam
AssigneeBristol, Inc.
InventorThomas Matthew Mills
Life of this patent
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Abstract
A method of controlling at least one of a flow rate or pressure of an injected fluid includes receiving a measured value indicative of the at least one of the flow rate or the pressure of the injected fluid, and determining a control mode for controlling the at least one of the flow rate or the pressure. The method further includes controlling the at least one of the flow rate or the pressure of the injected fluid according to the selected control mode including: determining a command signal to be communicated to a field device, and communicating the command signal to the field device.
Claims20
A method of controlling a flow rate and a pressure of an injected fluid, the method comprising:
- receiving a first measured value indicative of the flow rate and a second measured value indicative of the pressure of the injected fluid;
- determining a first control mode for controlling the flow rate at or below a level of a flow rate threshold and the pressure at or below a level of a pressure threshold, wherein determining the first control mode includes selecting the first control mode from a plurality of control modes, wherein the first control mode is implemented using a first proportional-integral-differential (PID) control loop, and wherein first proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint;
- controlling the flow rate and the pressure of the injected fluid according to the first control mode for a first period of time including:
- determining a first command signal to be communicated to a field device, the field device coupled to a line through which the injected fluid flows, and
- communicating the first command signal to the field device,
- determining a second control mode for controlling the pressure to reduce a pressure of an injected fluid to a level below the pressure threshold, wherein determining the second control mode includes selecting a second control mode from the plurality of control modes, wherein the second control mode is implemented using a second proportional-integral-differential (PID) control loop, wherein second proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint, and wherein the second proportional-integral-differential (PID) control loop parameters are different than the first proportional-integral-differential (PID) control loop parameters;
- and
- controlling the flow rate and the pressure of the injected fluid according to the second control mode for a second period of time including:
- determining a second command signal to be communicated to the field device, and
- communicating the second command signal to the field device.
9 more elements
A process control system comprising:
- a process control device configured to control an injection of a fluid;
- a first communicative link between the process control device and at least one of a pressure sensor detecting a pressure of the fluid and a flow element detecting a flow rate of the fluid;
- and
- a second communicative link between the process control device and a field device, wherein the process control device communicates with the field device to control the pressure and the flow rate of the fluid,
- wherein the process control device is configured to:
- receive, via the first communicative link, a first measured value indicative of the flow rate and a second measured value indicative of the pressure of the fluid,
- determine a first control mode for controlling the flow rate and the pressure of the fluid, wherein determining the first control mode includes selecting the first control mode from a plurality of control modes, wherein the first control mode is implemented using a first proportional-integral-differential (PID) control loop, and wherein first proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint,
- control, via the second communicative link, the flow rate and the pressure of the injected fluid at or below a level of a respective threshold for a first period of time according to the first control mode,
- determine a second control mode for controlling the pressure of the fluid, wherein determining the second control mode includes selecting the second control mode from the plurality of control modes, wherein second proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint, and wherein the second proportional-integral-differential (PID) control loop parameters are different than the first proportional-integral-differential (PID) control loop parameters, and
- control, via the second communicative link, the at least one of the flow rate or the pressure of the injected fluid below a level of the threshold for a second period of time according to the second-control mode.
9 more elements
A process control device comprising:
- one or more processors;
- a communication module configured to receive a first measured value indicative of a pressure and a second measured value indicative of a flow rate of a fluid;
- a primary objective control module specifically configuring the process control device such that, when executed by the one or more processors, the primary objective control module causes the process control device to maintain a reservoir pressure within a reservoir at or below a pressure threshold and a flow rate of fluid into the reservoir at or below a flow rate threshold based on an injection of the fluid into the reservoir for a first period of time by implementing a first proportional-integral-differential (PID) control loop, and wherein first proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint;
- an override objective control module specifically configuring the process control device such that, when executed by the one or more processors, the override objective control module causes the process control device to reduce a measured pressure of the fluid to a level below the pressure threshold for a second period of time by implementing a second proportional-integral-differential (PID) control loop, wherein second proportional-integral-differential (PID) control loop parameters are selected from the group:
- a proportional parameter, an integral parameter, a derivative parameter, and a setpoint, and wherein the second proportional-integral-differential (PID) control loop parameters are different than the first proportional-integral-differential (PID) control loop parameters;
- a control mode selector configured to:
- select one of the primary objective control module or the override objective control module based on the first and second measured values, and
- cause the one or more processors to execute the primary objective control module for the first period of time and the override objective control module for the second period of time.
6 more elements
Dependencies are inferred from the claim text.