Drill Bit Cutter Force Prediction for Borehole Trajectory Control
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Solution Overview
Problem
Current drilling technologies face inefficiencies in predicting and achieving precise borehole geometry and end location, leading to increased operational costs and reduced accuracy in hydrocarbon production, geothermal production, and carbon dioxide sequestration applications.
Innovation Solution
A method and apparatus that utilize lithology data, drilling parameters, and drill bit design information to calculate confined compressive strength, area of cut, effective back rake, and forces applied to drill bit cutters, enabling the prediction of weight on bit (WOB) and torque on bit (TOB), which are then used to simulate and control the drilling process for precise borehole geometry and trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional drilling methods are used without predictive modeling, then drilling operations can be performed, but borehole geometry and end location accuracy are insufficient
Solution Approach 1:
The patent applies preliminary action by calculating confined compressive strength, area of cut, effective back rake, and forces on cutters before actual drilling occurs. These pre-calculations enable prediction of weight on bit and torque on bit, allowing operators to anticipate drilling behavior and adjust parameters in advance to achieve desired borehole geometry and end location accuracy.
Solution Approach 2:
The patent implements feedback through a predictive modeling system that continuously refines borehole trajectory predictions based on calculated forces and drilling parameters. The model uses calculated WOB and TOB values to feedback into drilling control systems, enabling real-time adjustments to maintain precision in borehole geometry and end location.
2Productivity
If drilling operations proceed without predictive calculations, then drilling can be performed, but operational costs increase due to inefficiencies
Solution Approach 1:
The patent reduces operational costs by performing preliminary calculations of confined compressive strength, area of cut, effective back rake, and cutter forces before drilling begins. These pre-computed values enable optimized drilling parameter selection, avoiding trial-and-error approaches and reducing energy waste from inefficient drilling operations.
Solution Approach 2:
The patent optimizes drilling efficiency by calculating and adjusting key parameters including confined compressive strength, area of cut, effective back rake, weight on bit, and torque on bit. These parameter optimizations enable more efficient drilling operations with reduced energy consumption and lower operational costs while maintaining or improving productivity.
3Measurement precision
If drill bit design and formation properties are not precisely calculated, then drilling can occur, but drilling precision is reduced
Solution Approach 1:
The patent enhances measurement precision by performing preliminary calculations of confined compressive strength, area of cut, effective back rake, and forces on cutters before drilling. These pre-calculated values enable accurate prediction of weight on bit and torque on bit, which are critical for controlling borehole geometry precision and achieving the desired borehole characteristics.
Data Source
AI summary
A method for predicting an amount of axial motion of a drill bit having one or more cutters for drilling formation rock includes: receiving lithology data for the formation rock; receiving drilling parameters; calculating confined compressive strength (CCS) of the rock using the received information; calculating an area of cut into the formation rock by each of the one or more cutters; calculating an effective back rake of each of the one or more cutters; calculating a force applied to each of the one or more cutters using the CCS, the area of cut and the effective back rake of the one or more cutters, and by accounting for an orientation of each cutter with respect to a surface of the rock to be cut; and summing the calculated forces applied to each of the one or more cutters to calculate the weight on bit and torque on bit.