Caliper Arm Borehole Mapping Mechanism
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Solution Overview
Problem
Existing borehole mapping technologies, such as wireline mechanisms, are not rugged enough to survive the violent drilling environment and cannot adequately capture the shape of a borehole due to their delicate articulating linkages, limiting their ability to measure borehole geometry effectively during drilling operations.
Innovation Solution
A downhole drilling tool that rotates to sweep a mechanical device across the complete surface of the borehole wall, using fewer mechanical mechanisms and devoting more volumetric capacity to ruggedizing the tool's base structure, equipped with a caliper arm that extends to contact the borehole wall and measures its shape through a mechanical method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireline mechanisms are used for borehole mapping, then measurement capability is provided, but the tool lacks ruggedness to survive drilling conditions
Solution Approach 1:
The borehole mapping function is segmented into multiple independent caliper arms rather than using a single complex wireline mechanism. Each caliper arm operates independently to measure borehole diameter at different positions, distributing the mechanical complexity across simpler, ruggedized components that can withstand drilling conditions.
Solution Approach 2:
The patent replaces the wireline-based mechanical system with a direct mechanical caliper system integrated into the drilling tool. This substitution eliminates the need for delicate wireline articulating linkages by using robust mechanical caliper arms that directly contact and measure the borehole wall during drilling operations.
2Measurement precision
If wireline tools are used, then borehole shape measurement is possible, but they cannot adequately capture the complete borehole surface
Solution Approach 1:
The drilling tool is designed with multi-functionality, serving both as a drilling device and a borehole mapping instrument. The caliper arms are integrated into the drilling tool housing, allowing the same tool to perform both drilling and comprehensive borehole shape measurement without requiring separate wireline tools, thereby capturing the complete borehole surface while maintaining durability.
Solution Approach 2:
The patent transitions from single-point wireline measurements to multi-dimensional measurements by deploying multiple caliper arms that simultaneously measure borehole diameter at various angular positions. This dimensional expansion provides comprehensive coverage of the complete borehole surface, capturing ovality and irregularities that single-point measurements would miss.
3Measurement precision
If more mechanical mechanisms are used in wireline tools, then measurement coverage increases, but the tool becomes less rugged
Solution Approach 1:
The measurement system is segmented into multiple simple caliper arms rather than one complex mechanism. Each arm is a straightforward mechanical component with high structural strength, and collectively they provide comprehensive borehole geometry measurement coverage without compromising individual component ruggedness.
Solution Approach 2:
Each caliper arm is designed with local quality optimized for its specific measurement function, featuring a simple hinge connection and contact point. This localized simplicity maintains high structural strength at each measurement point while the aggregate system achieves comprehensive measurement coverage through multiple distributed arms.
Data Source
AI summary
The disclosure provides for a bottom hole assembly that comprises a housing and a caliper arm. The caliper arm is pivotally coupled to the housing at a hinge disposed within the housing, wherein the caliper arm is operable to rotate about the hinge between a first position within the housing and a second position external to the housing. The bottom hole assembly further comprises a linear actuator coupled to the caliper arm and operable to extend the caliper arm to the second position, wherein the caliper arm is biased to remain in the second position in contact with a borehole wall. The bottom hole assembly further comprises a sensor disposed within the housing and operable to monitor a position of the caliper arm.