Extendable Well Logging Tool Protection Against Drill String Forces
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Solution Overview
Problem
Pipe-conveyed well logging tools are fragile and prone to damage due to forces from the drill string, and they often lack accurate depth control and communication with the surface, leading to inaccurate measurements in deviated or horizontal wells.
Innovation Solution
A pipe-conveyed extendable well logging tool system with a retractable and deployable design, using a garage assembly within the drill pipe, position sensors for depth correction, and a pressure differential deployment system to protect the tools from damage and ensure accurate data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pipe conveyed logging tools are latched into the bottom of the drill string, then the tools can be transported into the well bore, but the downward motion of the pipe transmits large forces to the tools causing damage
Solution Approach 1:
The logging tool assembly is designed with dynamic extension and retraction capability, allowing it to transition between extended and retracted states. When forces exceed a threshold, the assembly automatically retracts to protect against damage, then can be re-extended for continued logging operations
Solution Approach 2:
A force sensor continuously monitors forces applied to the logging tool assembly and provides feedback to the control system. When forces exceed the threshold, the controller activates the extension mechanism to retract the assembly, creating a closed-loop control system that prevents damage
2Measurement precision
If the logging tools are extended from the drill pipe, then depth measurements can be taken, but upward forces and debris cause unwanted adjustments in distance from the drill pipe affecting measurement accuracy
Solution Approach 1:
A position sensor continuously monitors the distance between the logging tool assembly and the drill pipe and provides feedback to the control system. When the distance deviates from the expected value, the controller activates the extension mechanism to adjust the position, maintaining measurement accuracy
Solution Approach 2:
The system uses its own position sensor and extension mechanism to automatically correct position deviations caused by upward forces or debris, without requiring external intervention
3Adaptability or versatility
If pipe conveyed logging tools are used, then logging can be performed in deviated or horizontal wells, but the tools lack communication with the surface for direct control
Solution Approach 1:
The system replaces mechanical control with an electronic control system that receives commands from the surface via the drill string conduit and actuates the extension mechanism and logging instruments electronically
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 protects the logging tools from damage, maintains accurate depth measurements, and allows for repeat logging operations, enhancing the reliability and precision of well logging data collection in challenging well bore conditions.
Implementation Method 1
a means for extending and retracting the logging tool assembly relative to the drill pipe using a pressure differential
Data Source
AI summary
A pipe conveyed extendable well logging assembly includes a deployment system for extending and retracting a well logging tool relative to the pipe while downhole. The logging tool may be releasably latched to the pipe, and may include position sensors for position feedback and depth correction.