Automated Choke Control for Mud-Gas Separator Safety
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Solution Overview
Problem
Current drilling systems face inefficiencies and safety risks during the removal of unknown fluids containing gas from the wellbore and marine riser, primarily due to manual control processes that are prone to error and depend on pressure or flow conditions upstream of the choke manifold.
Innovation Solution
A system utilizing instrumented mud-gas separators with fluid and pressure sensors to automatically control the choke manifold and mud pumps, ensuring safe and efficient delivery of unknown fluids to the separators by monitoring their state in real-time and adjusting flow rates accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual control processes are used to manage fluid return during drilling operations, then operational flexibility is maintained, but safety risks increase and response time is delayed due to human error and manual intervention
Solution Approach 1:
The system continuously monitors fluid return conditions (flow rate, gas content, pressure) and automatically adjusts choke manifold settings based on real-time feedback. This closed-loop control eliminates manual intervention delays and ensures immediate response to changing well conditions, directly resolving the contradiction between safety and response time
Solution Approach 2:
The automated control system performs self-adjustment of fluid return management without requiring manual intervention. The system autonomously detects kicks, calculates optimal choke settings, and executes control actions, thereby eliminating human error and response delays while maintaining continuous safety monitoring
2Ease of operation
If low flow rates are used to simplify manual control of pressures, then ease of operation is improved, but productivity decreases due to extended removal time for gas from fluids
Solution Approach 1:
The system dynamically adjusts flow rates based on real-time well conditions and mud-gas separator state. Rather than maintaining static low flow rates for simplicity, the automated system optimizes flow rates continuously, achieving both ease of operation through automation and high productivity through adaptive flow management
Solution Approach 2:
The system changes operational parameters (flow rate, pressure, choke opening) dynamically based on real-time conditions and separator state. This allows the system to operate at optimal productivity levels while the automated control maintains operational simplicity, resolving the contradiction between ease of operation and productivity
3Productivity
If automatic control systems with real-time monitoring are implemented, then productivity and safety are improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The control system integrates multiple functions into a single automated platform that performs monitoring, calculation, and control operations. The system uses existing infrastructure (choke manifold, mud-gas separator) while adding intelligent control capabilities, achieving high productivity without proportionally increasing complexity through multi-functionality
Solution Approach 2:
The system introduces a control intermediary (automated control unit) that bridges the existing drilling equipment and the mud-gas separator. This intermediary handles the complexity of real-time monitoring and control, allowing the rest of the system to remain relatively simple while achieving high productivity through intelligent mediation
4Ease of operation
If the choke manifold is controlled based on upstream pressure or flow conditions, then ease of operation is maintained, but measurement precision deteriorates because it does not directly monitor separator state
Solution Approach 1:
The system implements direct feedback from the mud-gas separator state (fluid level, pressure, gas content) to the choke manifold control. This ensures the choke settings are precisely adjusted based on actual separator conditions rather than indirect upstream measurements, resolving the contradiction between control simplicity and measurement precision through automated feedback
Solution Approach 2:
The system replaces indirect mechanical pressure/flow-based control with direct electronic sensing and control based on separator state. Sensors directly monitor separator conditions and electronically adjust the choke manifold, achieving both operational simplicity through automation and high measurement precision through direct monitoring
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
This approach significantly reduces the time required to remove gas from unknown fluids and enhances safety by automating the process, reducing reliance on manual intervention and minimizing risks associated with gas expansion and overflow.
Implementation Method 1
instrumented mud-gas separators...to automatically control the choke manifold and mud pumps, ensuring safe and efficient delivery of unknown fluids to the separators
Implementation Method 2
instrumented mud-gas separators with fluid and pressure sensors to automatically control the choke manifold
Data Source
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AI summary
The present disclosure relates to methods and systems for controlled delivery of unknown fluids that safely and efficiently removes entrained gas from unknown fluids in the wellbore and/or marine riser. A control system automatically controls one or more choke manifold(s), and optionally the flow rate of one or more mud pump(s), to maximize the safe flow rate of returning unknown fluids to one or more instrumented mud-gas separator(s) without overloading. The control system may receive the state of the one or more instrumented mudgas separator(s) to manipulate the choke manifold(s), and optionally the one or more mud pump(s) to maximize the safe flow rate of return fluids and expedite the removal of gases.