Downhole Processor Model Parameter Extraction for Telemetry Bandwidth
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Solution Overview
Problem
Current drilling control systems face inefficiencies due to bandwidth limitations in telemetry systems, which hinder the timely updating of mathematical models used for predicting drilling parameters, leading to potential equipment damage and downtime.
Innovation Solution
A system and method that includes a bottom hole assembly with sensor modules and a processor that calculates model parameters from received measurements, then transmits these parameters to a surface control unit, allowing for real-time optimization of drilling operations using low-bandwidth telemetry systems like mud-pulse or EM telemetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mud-pulse telemetry system is used to transmit data from bottom hole assembly to surface, then system cost is reduced and reliability is improved, but data transmission bandwidth is insufficient for timely model updating
Solution Approach 1:
The patent extracts only the essential model parameters (such as drill string dynamics, BHA vibrations, stick-slip conditions) from the complete set of downhole measurements, transmitting only these critical parameters through the limited bandwidth telemetry system while leaving the full data processing at the bottom hole assembly processor
Solution Approach 2:
The patent transforms raw measurement data into simplified model parameters that capture the essential drilling dynamics. By changing the data representation from comprehensive raw measurements to condensed model parameters, the system achieves efficient transmission within bandwidth constraints while maintaining model accuracy
2Loss of information
If wired pipe telemetry system is used instead of mud-pulse or EM telemetry, then data transmission bandwidth is sufficient for complete model updating, but system cost increases and reliability decreases
Solution Approach 1:
The patent extracts and processes data at the bottom hole assembly using local computational resources, transmitting only essential model parameters rather than complete raw data sets, thereby eliminating the need for high-bandwidth wired pipe systems
3Productivity
If drilling rate-of-penetration is increased to improve productivity, then drilling efficiency is improved, but probability of equipment damage and abnormal drilling events increases
Solution Approach 1:
The patent implements a closed-loop control system where downhole sensors continuously measure drilling parameters (vibrations, torque, weight on bit), the bottom hole assembly processor updates the drilling dynamic model in real-time, and the surface control system adjusts drilling parameters based on model predictions to prevent stick-slip and whirl conditions
Solution Approach 2:
The patent uses the mathematical model to predict potential drilling problems (stick-slip, whirl, equipment damage) before they occur by analyzing current drilling parameters and trends, allowing the control system to take preventive action by adjusting drilling parameters before abnormal conditions develop
Data Source
AI summary
A system includes a control unit including a model of the system that includes model parameters and operational conditions. The system also includes an assembly that includes one or more sensor modules and a second processor, the second processor including definitions of the model parameters and configured to determine the model parameters based on information received from the one or more sensors. The system also includes a communication medium communicatively coupling the control unit and the assembly.