Instrumented Engagement Element Assembly for While-Drilling Borehole Sensing
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Solution Overview
Problem
Conventional wellbore imaging and mapping tools are expensive, have limited accuracy and resolution, and can only be used when the well is not actively drilling, making it difficult to accurately detect and characterize downhole dynamics and geological formations during the drilling process.
Innovation Solution
An instrument assembly with an engagement element and sensor assembly is integrated into a downhole tool, featuring an electronics housing that seals against downhole pressure, allowing for real-time measurement of engagement forces and geological features while drilling, using ultrahard materials for the engagement element and a sealed connection to protect electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional imaging tools are used to measure wellbore parameters, then measurements can be taken, but the tools can only be used when the well is not actively drilling, limiting their usefulness for detecting downhole dynamics during drilling
Solution Approach 1:
The patent combines the imaging tool and engagement element into a single integrated downhole tool assembly. The sensor assembly is positioned at the base of the engagement element assembly, allowing simultaneous drilling and imaging operations. This merging enables the tool to function during active drilling rather than requiring separate imaging operations after drilling completion.
2Measurement precision
If conventional imaging tools are positioned uphole of engagement tools, then the tools can be implemented during drilling, but measurements have limited accuracy and resolution due to the distance from the engagement point
Solution Approach 1:
The sensor assembly is nested within the engagement element assembly structure, with the sensor positioned at the base of the engagement element. This nested configuration places the sensing capability directly at the point of formation engagement, maximizing measurement accuracy while maintaining a compact tool design.
Solution Approach 2:
The patent transitions the measurement location from a distant uphole position to the immediate engagement point by repositioning the sensor assembly in a different spatial dimension - directly at the base of the engagement element where formation interaction occurs.
3Productivity
If engagement elements are exposed to downhole pressure, then they can engage the formation, but electronics housed nearby are exposed to damaging downhole conditions
Solution Approach 1:
The downhole tool is segmented into distinct functional zones: an engagement element assembly that interfaces with the formation and is exposed to downhole conditions, and a sealed electronics housing that protects sensitive components. This segmentation allows each component to operate in its optimal environment.
Solution Approach 2:
A seal assembly acts as an intermediary barrier between the engagement element assembly and the electronics housing. The seal prevents downhole pressure and fluids from reaching the electronics while allowing the engagement element to function normally in the harsh downhole environment.
Data Source
AI summary
An instrument assembly comprises an electronics housing disposed in a body of a downhole tool and an engagement element assembly connected to the electronics housing. The instrument assembly includes an engagement sensor positioned at a base of the engagement element assembly and configured to take measurements corresponding with an engagement of the engagement element assembly with a borehole. The instrument assembly includes an electronics housing seal configured to seal at least a portion of the electronics housing from a downhole pressure.