Flexible Wire Mesh Caliper for Wellbore Shape Measurement
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Solution Overview
Problem
Conventional downhole caliper tools face challenges in accurately measuring the size and shape of wellbores due to limitations in mechanical durability and fluid interaction, leading to inaccuracies in predicting downhole issues and drilling efficiency.
Innovation Solution
The development of downhole caliper tools with a flexible wire mesh caliper and advanced sensor modules that include piezoelectric, electromagnetic, and magnetostrictive sensors, capable of withstanding high temperatures and pressures, and designed to bypass fluid and minimize cuttings accumulation, allowing for precise measurement of wellbore diameters and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wireline calipers with rigid pads are used to measure wellbore diameter, then the measurement mechanism is simple and robust, but the tool cannot accurately adapt to varying wellbore shapes and suffers from mechanical durability issues under high temperature and pressure
Solution Approach 1:
The patent employs a flexible wire mesh caliper structure that can deform and adapt to varying wellbore shapes while maintaining structural integrity under downhole conditions. The wire mesh acts as a flexible yet durable measurement interface that conforms to the wellbore wall, resolving the contradiction between measurement precision for irregular shapes and mechanical reliability under extreme conditions.
Solution Approach 2:
The caliper tool utilizes composite construction combining wire mesh with supporting structural elements. This composite approach provides both the flexibility needed for accurate shape adaptation and the mechanical strength required for durability under high temperature and pressure, simultaneously achieving measurement precision and reliability.
2Productivity
If conventional caliper tools are used in high-speed drilling operations, then the tool structure remains simple, but the tool cannot provide real-time measurement data fast enough to enable timely drilling parameter adjustments
Solution Approach 1:
The patent integrates multiple sensor types (piezoelectric, electromagnetic, and magnetostrictive sensors) into a unified sensor module that can simultaneously measure various wellbore parameters. This multi-functional approach enables real-time data acquisition during high-speed drilling without requiring separate measurement systems, thus improving productivity while managing device complexity through integration.
Solution Approach 2:
The patent combines multiple sensing technologies and measurement functions into a single integrated sensor module. By merging these functions, the tool can provide comprehensive real-time measurements during high-speed drilling operations, enabling timely adjustments to drilling parameters without proportionally increasing overall device complexity.
3Measurement precision
If conventional caliper tools are deployed in wells with high fluid flow and cuttings, then the measurement mechanism remains simple, but cuttings accumulation on the caliper surface leads to measurement inaccuracies
Solution Approach 1:
The patent employs a wire mesh structure with inherent porosity that allows drilling fluid to flow through the caliper assembly. This porous configuration prevents cuttings from accumulating on the measurement surface by enabling continuous fluid flow that carries away particles, thereby maintaining measurement precision in high-cuttings environments.
Solution Approach 2:
The wire mesh caliper design utilizes the hydraulic flow of drilling fluid to prevent cuttings accumulation. The fluid dynamics through the porous mesh structure create a self-cleaning effect that removes cuttings from the measurement surface, ensuring accurate wellbore dimension measurements despite high fluid flow and cuttings presence.
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
These tools provide enhanced accuracy and reliability in measuring wellbore dimensions, enabling real-time adjustments to drilling operations, improved drilling efficiency, and better prediction of downhole problems such as washout and breakout conditions.
Implementation Method 1
The sensor module includes piezoelectric, electromagnetic, and magnetostrictive sensors
Implementation Method 2
The sensor module includes piezoelectric, electromagnetic, and magnetostrictive sensors
Implementation Method 3
The sensor module includes piezoelectric, electromagnetic, and magnetostrictive sensors
Data Source
AI summary
Tools and methods are described to measure dimensions of wellbores. Downhole caliper tools include: a downhole collar; an uphole collar; and a caliper sensor assembly disposed between the downhole collar and the uphole collar. The caliper sensor assembly include: an annular sensor module defining a plurality of radially extending tracks; and a caliper including: a plurality of linear slide arms, each linear slide arm at least partially disposed in the annular sensor module in one of the plurality of radially extending tracks and radially moveable relative to the annular sensor module, each linear slide arm extending from a first end within the annular sensor module to a second end outside the annular sensor module, and a cover extending from the downhole collar to the uphole collar. The annular sensor module can measure the radial position of the plurality of linear slide arms relative to the annular sensor module.