Drilling Parameter Optimization Using Offset Borehole Data
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Solution Overview
Problem
Current drilling methods lack an effective method to optimize drill string force parameters for improving the rate of penetration and reducing drilling costs in borehole operations.
Innovation Solution
A method that analyzes drilling parameters from offset boreholes to identify those that achieve the highest rate of penetration with minimal dysfunctions, and automatically adjusts drilling parameters in real-time based on lithology changes, using a processor and sensors to optimize borehole drilling plans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional drilling methods are used without optimization, then drilling operations can proceed with simple control, but the rate of penetration is suboptimal and drilling costs are higher
Solution Approach 1:
The system performs preliminary analysis of drilling parameters from offset boreholes before actual drilling begins. The processor identifies optimal drilling parameters corresponding to high ROP for different lithologies in advance, and correlates these with the borehole plan before drilling commences.
Solution Approach 2:
The system implements continuous feedback by comparing actual ROP sensed by drill rig sensors with assumed ROP from identified drilling parameters. When the difference exceeds a threshold, the system automatically updates drilling parameters and sends override signals to the drill rig controller to maintain optimal performance.
2Reliability
If drilling parameters are manually adjusted based on experience, then operational simplicity is maintained, but drilling dysfunctions increase and cost efficiency decreases
Solution Approach 1:
The system performs self-service by automatically identifying optimal drilling parameters, correlating them with lithology changes, and adjusting parameters without human intervention. The processor autonomously monitors drilling progress, compares actual versus assumed ROP, and updates parameters when thresholds are exceeded, enabling the system to self-optimize drilling operations.
Solution Approach 2:
The patent replaces manual mechanical adjustment of drilling parameters with an automated electronic control system. The processor and drill rig controller substitute for human operators, using sensors and computational algorithms to automatically adjust drilling parameters based on real-time conditions and pre-analyzed optimal parameters.
3Productivity
If optimal drilling parameters are used for each lithology, then rate of penetration improves, but the complexity of parameter management increases
Solution Approach 1:
The system segments drilling operations by lithology types encountered in the borehole plan. It identifies optimal drilling parameters for each specific lithology separately and applies them automatically when corresponding lithology intervals are encountered, managing complexity through segmentation rather than uniform parameter management.
Solution Approach 2:
The drill rig controller serves multiple functions: it receives and stores identified drilling parameters for different lithologies, monitors actual drilling conditions, compares actual ROP with assumed ROP, and automatically adjusts parameters based on lithology changes and performance thresholds. This multi-functionality consolidates parameter management into a single automated system.
Data Source
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AI summary
A method implemented by a processor for drilling a borehole includes: inputting drilling parameters used to drill one or more offset boreholes, rate of penetration for the one or more offset boreholes, and one or more lithologies for the one or more offset boreholes; identifying those drilling parameters that correspond to a rate of penetration (ROP) that meets or exceeds a selected ROP threshold for each input lithology; correlating a borehole plan comprising a borehole path to be drilled and one or more assumed lithologies as a function of depth to the one or more lithologies of the one or more offset boreholes; sending the identified drilling parameters to a drill rig controller for each of the assumed lithologies in the borehole plan; and drilling the borehole with the drill rig using the identified drilling parameters for each of the one or more assumed lithologies in the borehole plan.