Managed Pressure Drilling Real-Time ECD Control
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Solution Overview
Problem
Maintaining the equivalent circulating density (ECD) of the drilling fluid within the allowable density window is challenging due to increased annulus pressure drop, as existing systems rely on manual measurements of drilling fluid properties, which are often outdated and do not account for real-time changes.
Innovation Solution
Implementing real-time density and rheology sensors to automatically feed into hydraulics models, which control the annulus pressure gradient and static downhole pressure using a managed pressure drilling (MPD) system, incorporating a controllably adjustable flow control apparatus to maintain the ECD within the desired range by continuously measuring and adjusting the drilling fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual measurements of drilling fluid properties are used, then device complexity is reduced, but measurement precision and reliability of ECD control deteriorate due to outdated data
Solution Approach 1:
The patent replaces manual mechanical measurement systems with automated sensor-based measurement systems. Real-time sensors continuously measure drilling fluid properties (density, rheology) and feed data to hydraulics models, eliminating the need for manual sampling and laboratory analysis, thereby improving measurement precision while maintaining manageable system complexity through automation.
Solution Approach 2:
The patent implements a closed-loop feedback system where real-time sensor measurements of fluid properties are continuously fed into hydraulics models, which then provide feedback to the MPD system to dynamically adjust annulus pressure and maintain ECD within the allowable window, ensuring reliable and accurate control.
2Reliability
If real-time sensors and automated control systems are implemented, then measurement precision and ECD control reliability improve, but device complexity increases
Solution Approach 1:
The patent employs a multi-functional MPD system that integrates real-time sensor measurements, hydraulics modeling, and automated pressure control into a single unified platform. The system simultaneously performs multiple functions: measuring fluid properties, calculating pressure losses, determining optimal wellhead pressure, and controlling the flow control apparatus, thereby improving reliability while managing complexity through functional integration.
Solution Approach 2:
The patent implements self-service automation where the system automatically measures fluid properties, updates hydraulics models, calculates required pressure adjustments, and controls the flow control apparatus without requiring continuous manual intervention, thereby improving ECD control reliability while reducing the operational complexity burden on personnel.
3Manufacturing precision
If continuous real-time measurement and adjustment are performed, then manufacturing precision of ECD control improves, but loss of energy increases due to continuous operation of sensors and control systems
Solution Approach 1:
The patent implements continuous real-time measurement and control to maintain ECD precision within the narrow allowable window between pore and fracture pressures. The continuous operation of sensors and control systems ensures that ECD remains accurately controlled despite dynamic changes in drilling conditions, accepting the energy consumption necessary to maintain such precise control throughout the drilling operation.
Data Source
AI summary
A method for controlling a downhole pressure during drilling comprises continually sensing in real-time at least one real-time fluid property of an input fluid to a well and of a return fluid from the well. A wellhead setpoint pressure is calculated in real-time that results in a predetermined downhole pressure at a predetermined location in the well, where the calculation based, at least in part, on the at least one continually sensed real-time fluid property. The flow of the return fluid is controllably regulated to maintain the calculated wellhead setpoint pressure.