Coring Bit Retraction Control via Formation Sensing
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Solution Overview
Problem
Current formation evaluation methods face challenges in accurately determining the rate of retraction of a coring bit during drilling operations, particularly in unconsolidated formations, which can lead to core samples being left behind or sliding out of the bit.
Innovation Solution
A downhole tool equipped with sensors to measure bit rotation speed, torque at bit, weight on bit, and rate of penetration, which transmits these measurements to a surface operator and processes them to automatically adjust the coring bit's retraction rate based on sensed environmental factors, such as formation consolidation, to prevent core loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the coring bit retracts quickly from the formation, then the coring operation productivity increases, but core samples may be left behind or slide out of the bit in unconsolidated formations
Solution Approach 1:
The system dynamically adjusts the retraction rate of the coring bit based on real-time sensing of formation properties. The controller modifies the retraction speed according to the sensed formation characteristics, enabling the system to adapt between fast retraction in consolidated formations and slow retraction in unconsolidated formations, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The system employs sensors to detect formation properties during coring operations and feeds this information back to the controller. The controller then adjusts the retraction rate based on this feedback, creating a closed-loop control system that optimizes core recovery while maintaining efficient operations
2Reliability
If the coring bit retracts slowly from the formation, then core sample recovery reliability improves, but the coring operation productivity decreases
Solution Approach 1:
The system dynamically adjusts the retraction rate of the coring bit based on real-time sensing of formation properties. The controller modifies the retraction speed according to the sensed formation characteristics, enabling the system to adapt between fast retraction in consolidated formations and slow retraction in unconsolidated formations, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The system changes the retraction rate parameter based on sensed formation properties. By adjusting this critical parameter according to formation consolidation status, the system optimizes both core recovery reliability and operational efficiency without requiring manual intervention
3Device complexity
If manual monitoring and adjustment of retraction rate is used, then device complexity is reduced, but measurement precision and response time to formation changes deteriorate
Solution Approach 1:
The system performs self-adjustment of the retraction rate based on automated sensing and control. The downhole tool autonomously monitors formation properties and adjusts its own retraction speed without requiring manual intervention from surface operators, thereby maintaining high measurement precision and rapid response while keeping the control system relatively simple
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
The system effectively reduces the risk of core samples being left in the formation or sliding out by adjusting the retraction rate according to formation conditions, ensuring accurate sampling and data collection.
Implementation Method 1
sensing a first environmental factor associated with the coring operations at the first location
Data Source
AI summary
The present disclosure relates to systems and methods for determining the retraction rate of a coring bit based on sensed environmental factors associated with coring operations. In certain embodiments, a downhole tool is positioned in a wellbore extending into a subterranean formation, coring operations are commenced by rotating a coring bit of the downhole tool and extending the rotating coring bit into a first location along a sidewall of the wellbore, a first environmental factor associated with the coring operations at the first location is sensed, and a rate of retraction of the coring bit at the first location is determined based on the first sensed environmental factor.