Automatic MPD-to-Well Control Switching for Stable Annular Pressure
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Solution Overview
Problem
Managed pressure drilling (MPD) systems are ill-equipped to maintain annular pressure when formation gas flows into the wellbore, leading to disruptions and potential damage due to rapid pressure changes and choke oscillation.
Innovation Solution
Implementing a system that automatically switches between managed pressure drilling and well control operations using a rig control system with integrated MPD and well control subsystems, including an RCD, MPD manifold, and choke and kill manifolds, to dynamically control fluid flow and pressure within the wellbore annulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the MPD manifold permits formation gas to escape quickly, then the gas can be removed from the wellbore, but the backpressure decreases suddenly causing annular pressure to drop and additional formation fluid to influx
Solution Approach 1:
The system dynamically adjusts the choke opening based on real-time detection of gas presence and pressure conditions. When gas is detected, the choke automatically opens to allow gas escape; when gas is cleared, the choke automatically closes to restore backpressure. This dynamic adjustment resolves the contradiction by making the gas removal process adaptive rather than static.
Solution Approach 2:
The control system continuously monitors annular pressure, flow rate, and other parameters to detect gas influx. Based on this feedback, the system automatically adjusts choke positioning to maintain pressure stability while removing gas. The feedback loop ensures that gas removal does not compromise annular pressure integrity.
2Quantity of substance
If the choke oscillates at high frequency and amplitude to expel formation gas, then the gas can be removed from the wellbore, but the MPD manifold equipment can be damaged
Solution Approach 1:
The system uses dynamic choke adjustment with automatic positioning based on gas detection. Instead of allowing high-frequency oscillation, the choke is automatically positioned to the appropriate opening degree when gas is detected, and automatically closed when gas is cleared. This eliminates equipment-damaging oscillations while maintaining effective gas removal capability.
Solution Approach 2:
The patent replaces manual choke operation with an automated control system that uses sensors and actuators. The control system processes sensor data and automatically adjusts the choke positioning, eliminating the need for high-frequency manual adjustments or oscillations that would damage equipment. This substitution of mechanical control with automated control protects equipment integrity.
3Ease of operation
If manual intervention is used to manage gas influx during MPD operations, then the operator can respond to well conditions, but the response time is delayed and operations are disrupted
Solution Approach 1:
The system performs self-monitoring and self-adjustment for gas influx conditions. Sensors continuously detect gas presence, and the control system automatically adjusts choke positioning without requiring manual intervention. This self-service capability eliminates response delays while maintaining effective gas management.
Solution Approach 2:
The control system uses continuous feedback from sensors monitoring annular pressure, flow rate, and other parameters to automatically detect and respond to gas influx. This automated feedback loop eliminates the time delay associated with manual monitoring and response, enabling immediate action when gas conditions are detected.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains stable annular pressure, preventing formation fluid influx and minimizing equipment damage by adjusting fluid flow rates and backpressure, ensuring smooth and controlled drilling operations.
Implementation Method 1
an annular sealing element that engages the outer surface of the drill string to prevent the flow of drilling fluid past the RCD and to the atmosphere
Implementation Method 2
The flow rate of the drilling fluid through the MPD manifold is restricted to generate back pressure at the upper end of the wellbore annulus
Implementation Method 3
The flow rate through the MPD manifold can be adjusted to control the back pressure and, thus, control wellbore pressure at the bottom and intermediate locations of the wellbore annulus
Data Source
AI summary
A control system for controlling pressure of fluid within a wellbore includes a rotating control device (RCD), a distribution manifold, a choke and kill (CK) manifold, and a managed pressure drilling (MPD) manifold fluidly connected with each other, a sensor operable to facilitate fluid measurements indicative of a property of the fluid, and a controller communicatively connected with the distribution manifold and the sensor. The controller is operable to receive the fluid measurements, cause the distribution manifold to direct the fluid discharged out of the wellbore via the RCD to flow through the MPD manifold to thereby permit the MPD manifold to control the pressure of the fluid within the wellbore, and cause the distribution manifold to direct the fluid discharged out of the wellbore via the RCD to flow through the CK manifold to thereby permit the CK manifold to control the pressure of the fluid within the wellbore.