Drilling Pressure Control Offset Choke Response
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Solution Overview
Problem
Current pressure control methods in drilling operations face challenges in rapidly adjusting to changing conditions, leading to potential over- or under-adjustment of the choke, which can result in extended times to achieve the desired wellbore pressure, especially during sudden changes in pressure or flow rates.
Innovation Solution
The method involves adding an offset to the pressure setpoint, allowing for quicker adjustment of the choke to maintain the desired wellbore pressure by applying a temporary boost to the pressure setpoint when significant deviations occur, and removing the offset once steady-state conditions resume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If current pressure control methods are used, then the system maintains basic pressure control capability, but the response time is slow and deviations from desired pressure persist for extended periods
Solution Approach 1:
The system calculates and applies an offset to the pressure setpoint in advance when a significant deviation is detected. This preliminary action prepares the control system for the expected pressure change, enabling faster response without causing excessive overshoot, thereby reducing the time to achieve the desired pressure.
Solution Approach 2:
The control system dynamically adjusts the pressure setpoint by adding a time-varying offset that responds to changing drilling conditions. This dynamic adjustment allows the system to adapt quickly to pressure deviations while maintaining stability, improving response speed without sacrificing control precision.
2Speed
If the choke is adjusted quickly to respond to pressure changes, then response time improves, but the risk of over-adjustment increases
Solution Approach 1:
The system continuously monitors actual wellbore pressure and compares it to the desired pressure setpoint. Based on this feedback, it calculates the appropriate offset amount and applies it to the setpoint, enabling fast adjustments while maintaining control accuracy through continuous correction and preventing over-adjustment.
Solution Approach 2:
The system changes the pressure setpoint parameter dynamically by adding an offset that is proportional to the detected deviation. This parameter change allows the system to respond quickly to pressure changes while the offset calculation ensures that adjustments remain within safe limits, maintaining both speed and reliability.
3Adaptability or versatility
If a fixed pressure setpoint is used, then the control logic is simple, but the system cannot adapt to sudden changes in drilling conditions
Solution Approach 1:
The control system automatically detects pressure deviations and calculates the appropriate offset without requiring complex external intervention. This self-service capability enables the system to adapt to changing drilling conditions autonomously while maintaining relatively simple control logic through automated decision-making algorithms.
Solution Approach 2:
The system adapts to changing conditions by dynamically modifying the pressure setpoint parameter based on detected deviations. This parameter change approach provides adaptability without requiring complete redesign of the control logic, as the core algorithm remains simple while the setpoint parameter adjusts automatically to new conditions.
Data Source
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AI summary
A method of controlling pressure in a wellbore can include determining a desired well pressure setpoint, adding an offset to the setpoint in response to an actual well pressure deviating from the setpoint by a predetermined amount, and adjusting a flow control device, thereby influencing the actual well pressure toward the setpoint plus the offset. A well system can include a flow control device which variably restricts flow from a wellbore, and a control system which determines a desired well pressure setpoint, compares the setpoint to an actual well pressure, and adds an offset to the setpoint in response to a predetermined amount of deviation between the setpoint and the actual well pressure, whereby the control system adjusts the flow control device, and thereby influences the actual well pressure toward the setpoint plus the offset.