Directional Drilling Control Using Closed-Loop Toolface Correction
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Solution Overview
Problem
Current directional drilling methods are prone to human error due to latency in receiving toolface orientation information, leading to undesirable drill bit wandering and reduced efficiency, and require frequent drill bit replacements due to inappropriate rate of penetration, which increases costs and non-productive time.
Innovation Solution
A computer-readable medium and method for autonomous, closed-loop directional drilling that interfaces with drilling sensors and communication systems to provide real-time data transmission and control, enabling precise control of drill bit direction and rate of penetration through a system that includes a drill string, downhole drive controller, top drive, drawworks, and mud pump, with sensors for data validation and reconciliation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human operators control directional drilling with verbal translation of toolface orientation, then the system is simple to operate, but human error increases and drilling efficiency decreases
Solution Approach 1:
The drilling system performs self-control through automated closed-loop control that directly processes downhole measurements and adjusts surface drilling operations without human intervention. The system monitors toolface orientation, torque on bit, and rate of penetration in real-time and automatically modifies drilling parameters to maintain optimal performance and prevent human error.
Solution Approach 2:
The system implements continuous feedback by transmitting downhole measurements including toolface orientation, torque on bit, and rate of penetration back to the control system. This real-time feedback enables the automated control algorithm to detect deviations from desired parameters and immediately adjust drilling operations to correct course, eliminating the latency and error associated with manual monitoring.
2Measurement precision
If real-time data transmission is implemented, then drilling control accuracy improves, but system complexity increases
Solution Approach 1:
The drilling system performs multiple functions through integrated components that simultaneously handle data acquisition, processing, and control. The downhole measurements system not only measures toolface orientation but also monitors torque on bit, rate of penetration, and other drilling parameters, eliminating the need for separate specialized systems and reducing overall complexity.
Solution Approach 2:
The system uses intermediate processing layers including data validation and reconciliation modules that filter and verify measurements before they reach the control algorithm. These intermediaries ensure data quality and reliability without requiring direct complex connections between all sensors and control elements, simplifying the overall system architecture.
3Manufacturing precision
If automated closed-loop control is used, then drilling parameter control improves, but initial setup cost increases
Solution Approach 1:
The automated control system is divided into distinct functional modules including downhole measurements acquisition, data validation and reconciliation, control algorithm processing, and surface operations control. This segmentation allows each module to be independently developed, tested, and implemented, reducing the complexity of system implementation and deployment.
Solution Approach 2:
The system performs preliminary data validation and reconciliation of downhole measurements before they are used by the control algorithm. This preliminary processing ensures data quality and prevents errors from propagating through the control system, reducing the need for complex error handling and system reconfiguration during operation.
4Productivity
If inappropriate rate of penetration is used, then drilling speed increases, but drill bit wear increases and replacements become more frequent
Solution Approach 1:
The system dynamically adjusts the rate of penetration in real-time based on downhole conditions including formation properties, toolface orientation, and torque on bit. Rather than maintaining a fixed high penetration rate, the control algorithm continuously optimizes the rate to balance productivity with drill bit preservation, automatically reducing speed when conditions indicate impending bit failure.
Solution Approach 2:
The control system monitors multiple drilling parameters including torque on bit, rate of penetration, and toolface orientation simultaneously and adjusts these parameters in coordination with each other. When torque increases indicating potential bit damage, the system automatically modifies the rate of penetration and other parameters to prevent further damage while minimizing the impact on overall drilling productivity.
Data Source
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AI summary
Embodiments of systems and methods to control directional drilling in borehole drilling for hydrocarbon wells are disclosed. An actual toolface orientation measurement value and an actual downhole torque on bit (DTOB) or actual downhole weight on bit (DWOB) measurement value for a drill string positioned in a borehole are determined. Responsive to a comparison of target measurement values and actual measurement values, error values are determined. A control command for one or more of a top drive, a drawworks, and a mud pump responsive to the DTOB or DWOB error value and the toolface orientation error value is determined. Additionally, one or more of the top drive, the drawworks, and the mud pump are operated responsive to the control command thereby to correct a toolface orientation of the drill string.