Automated Well Control System for Downhole Pressure Management
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Solution Overview
Problem
Existing well control systems struggle to maintain precise downhole pressure during influx situations, relying on manually controlled, hydraulically actuated chokes that cannot respond quickly to changing conditions, leading to inefficiencies in circulating out undesired fluids and risking wellbore instability.
Innovation Solution
A well control system utilizing a hydraulics model to determine and maintain a desired downhole pressure profile, combined with an automatically controlled choke or flow restrictor, which can precisely control pressure and flow through the wellbore, allowing for real-time adjustments and remote monitoring and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manually controlled, hydraulically actuated chokes are used, then the system is simpler to operate, but the response speed to changing conditions is slow and precision is insufficient
Solution Approach 1:
The patent replaces manual mechanical control of the choke with an automated electronic control system. The automated choke controller receives input from pressure sensors and flow meters, processes the data through control algorithms, and automatically adjusts the choke opening to maintain desired wellbore pressure. This substitution of manual mechanical control with automated electronic control resolves the contradiction by dramatically improving response speed while managing complexity through integrated control software.
Solution Approach 2:
The patent implements a closed-loop feedback control system where pressure sensors and flow meters continuously monitor wellbore conditions, feed this information back to the automated choke controller, which then adjusts the choke position to maintain target pressure. This feedback mechanism enables rapid response to changing conditions (improving speed parameter) while the automated control algorithm manages the complexity of real-time adjustments.
2Measurement precision
If manually controlled chokes are used, then the device complexity is lower, but the precision in maintaining desired bottomhole pressure is insufficient
Solution Approach 1:
The closed-loop feedback system continuously compares actual wellbore pressure (measured by pressure sensors) with target pressure, and automatically adjusts the choke position to eliminate any deviation. This feedback control achieves precise pressure maintenance (improving measurement precision) through automated real-time adjustments managed by control algorithms, resolving the contradiction between precision and complexity.
Solution Approach 2:
The replacement of manual choke adjustment with automated electronic control enables precise pressure management through computer-controlled algorithms that can make fine, rapid adjustments to choke position based on sensor feedback, achieving superior pressure control precision while managing system complexity through integrated control software.
3Productivity
If automated control systems are implemented, then response speed and precision improve, but the device complexity increases
Solution Approach 1:
The automated well control system integrates multiple functions into a single control platform: pressure monitoring, flow measurement, choke control, and data processing. This multi-functional integration improves productivity by coordinating all well control operations through one system while managing complexity through unified software architecture that handles multiple tasks simultaneously.
Solution Approach 2:
The closed-loop feedback control continuously monitors wellbore pressure and flow conditions, automatically adjusts choke position to maintain target parameters, and responds rapidly to changing conditions during influx circulation. This automated feedback control significantly improves influx circulation efficiency (productivity) by eliminating manual intervention delays, while the integrated control system manages the complexity of real-time multi-parameter control.
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 system enables rapid and precise control of pressure and flow, effectively preventing further influxes and maintaining wellbore stability, even in complex drilling operations, by using an automatically controlled choke or downhole flow restrictor, and allows for remote monitoring and operation.
Implementation Method 1
a hydraulics model to determine a desired downhole pressure profile
Implementation Method 2
an automatically controlled choke or flow restrictor, which can precisely control pressure and flow through the wellbore
Data Source
AI summary
A well control method can include removing from a wellbore an undesired influx from a formation into the wellbore, determining a desired pressure profile in real time with a hydraulics model, and automatically operating a flow choking device while removing the undesired influx from the wellbore, thereby influencing an actual pressure profile toward the desired pressure profile. Another well control method can include removing out of a wellbore an undesired influx from a formation into the wellbore, determining a desired wellbore pressure with a hydraulics model, the desired wellbore pressure preventing further influx into the wellbore while removing the undesired influx from the wellbore, and automatically operating a flow choking device while removing the undesired influx from the wellbore, thereby influencing an actual wellbore pressure toward the desired wellbore pressure.