Real-Time Maximum Horizontal Stress Calibration Using Caliper Log Data
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Solution Overview
Problem
Conventional drilling systems lack direct measurements for maximum horizontal stress, relying on theoretical solutions that introduce uncertainty into field operations.
Innovation Solution
A computer-implemented method that adjusts the maximum horizontal stress value in real-time using an analytical elastic breakout model, comparing predicted and observed breakout geometries from caliper log data to update mud weight calculations and drilling parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If theoretical solutions are used to calculate maximum horizontal stress, then calculations can be performed without direct measurement, but uncertainty is introduced into field operations
Solution Approach 1:
The system uses real-time caliper log data to measure actual breakout geometry and feeds this information back to the analytical elastic breakout model. The model continuously adjusts the maximum horizontal stress value until the predicted breakout geometry matches the observed breakout geometry, providing real-time validation and correction of stress calculations without requiring direct stress measurements
Solution Approach 2:
The patent replaces direct mechanical stress measurement devices with an indirect measurement approach using caliper log data and elastic breakout modeling. Instead of mechanically measuring stress directly, the system uses the relationship between breakout geometry and stress fields to infer stress values, eliminating the need for complex direct stress measurement equipment
2Measurement precision
If real-time calibration is performed using caliper log data, then accuracy of stress measurement is improved, but system complexity increases
Solution Approach 1:
The patent introduces breakout geometry as an intermediary parameter between the drilling system and the stress measurement. Instead of directly measuring stress, the system measures breakout geometry using standard caliper log tools, which then serves as the basis for calculating maximum horizontal stress through the analytical elastic breakout model, simplifying the overall measurement system
Solution Approach 2:
The system changes the measurement parameter from direct stress measurement to breakout geometry measurement. By measuring geometric parameters (breakout width, depth, and angle) that are easier to obtain with standard tools, the system indirectly determines stress values, improving measurement precision while avoiding the complexity of direct stress measurement devices
3Stability of the object's composition
If continuous updates of mud weight calculations are performed, then wellbore stability is optimized, but processing time and computational load increase
Solution Approach 1:
The system performs preliminary calculations of the analytical elastic breakout model to establish the relationship between breakout geometry and maximum horizontal stress before actual drilling operations. This pre-computation allows for rapid real-time updates during drilling, as the model framework is already established and only needs to match observed geometry to determine current stress conditions
Solution Approach 2:
The system implements dynamic, real-time updating of stress calculations and mud weight recommendations as drilling progresses. The analytical elastic breakout model continuously adapts to changing conditions by incorporating new caliper log data, allowing the system to respond dynamically to varying stress conditions while maintaining computational efficiency through the use of established model frameworks
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
Enables continuous, accurate measurement and correction of maximum horizontal stress, improving the stability of wellbores and optimizing mud weight during drilling operations.
Implementation Method 1
an analytical elastic breakout model
Data Source
AI summary
Systems and methods include a computer-method for updating drilling parameters in real time. A predicted breakout geometry is determined for a drilling operation of a petrochemical well. Determining the predicted breakout geometry uses an analytical elastic breakout model and includes determining a predicted breakout width, a predicted breakout depth, and a predicted breakout angle. The predicted breakout geometry is compared with an observed breakout geometry at an observed breakout angle determined in real time using real-time caliper log data obtained from a multi-finger caliper during the drilling operation. A maximum horizontal stress value in the analytical elastic breakout model is adjusted until the predicted breakout geometry matches the observed breakout geometry within a percentage threshold. Mud weight calculations for the drilling operation are updated in response to the comparing and adjusting. Drilling parameters for the drilling operation are changed in real time in response to the updating.