Single Set Point Choke for Automated Bottom Hole Pressure Control
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Solution Overview
Problem
Traditional methods for managing bottom hole pressure during subterranean drilling operations are prone to operator errors, leading to unstable pressure profiles and potential well conditions due to their reliance on manual control and schedules, which can result in unfavorable outcomes during drill pipe connections.
Innovation Solution
A system and method utilizing a single set point choke (SSPC) controlled by a controller that automatically adjusts to maintain a desired bottom hole pressure (BHP) by switching between manual and automated modes, receiving pressure data, and sending instructions to the choke to maintain pressure within a set range, thereby reducing operator dependency and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual control method with pump ramp schedule is used, then operator can control pressure, but operator errors occur and pressure stability deteriorates
Solution Approach 1:
The system uses automated control where the controller independently manages pressure by adjusting the choke valve based on feedback from pressure sensors, eliminating the need for manual operator intervention and pump ramp schedules. The system serves itself by automatically detecting pressure deviations and correcting them through choke adjustment.
Solution Approach 2:
The system implements closed-loop feedback control where pressure sensors continuously monitor bottom hole pressure and annulus pressure, feed this information to the controller, which then adjusts the choke valve position to maintain pressure within the desired range. This feedback mechanism ensures reliable pressure control without operator error.
2Adaptability or versatility
If multiple chokes and choke manifolds are used, then pressure management capability is improved, but device complexity increases
Solution Approach 1:
The system uses a single choke valve that performs multiple functions: controlling bottom hole pressure, managing annulus pressure, and maintaining pressure stability during drill pipe connections. The automated control system enables this single choke to replace what would traditionally require multiple chokes and manifolds, simplifying the device while maintaining full pressure management capability.
3Ease of operation
If hands-on technique is used, then operator can make adjustments, but operator dependency increases and errors occur
Solution Approach 1:
The system replaces manual mechanical adjustment operations with an automated electronic control system. The controller electronically adjusts the choke valve based on pressure sensor feedback, eliminating the need for manual hands-on adjustments by operators. This substitution maintains ease of operation through automated decision-making while eliminating operator dependency and associated errors.
Data Source
AI summary
Systems and methods for conducting subterranean operations and managing a bottom hole pressure (BHP) in a wellbore include receiving a first signal at a controller indicating a drill pipe connection or disconnection is beginning and switching the controller from a first control mode to a second control mode. The bottom hole pressure (BHP) in the wellbore is determined, a BHP set point is determined by the controller, and a first pressure set point is sent to a single set point choke (SSPC). The BHP is maintained by comparing the determined BHP to the BHP set point and adjusting the first pressure set point based on the comparison. The controller receives a second signal after the drill pipe connection or disconnection is complete prompting the controller to switch back to the first control mode.