Description
The Magnetic Thickness Tool (MTT) is a specialized downhole electromagnetic logging instrument designed to quantitatively measure casing and tubular wall thickness in oil and gas wells. By leveraging electromagnetic induction principles and a high‑resolution sensor array, MTT provides reliable, continuous measurements of metal loss, corrosion, pitting, and structural anomalies enabling operators and logging engineers to assess well integrity with confidence and accuracy.
MTT is widely used in cased‑hole logging, through‑tubing inspection, and corrosion evaluation workflows, delivering data essential for informed decisions regarding casing repair, remediation planning, and life‑of‑well surveillance.
What Is a Magnetic Thickness Tool?
The Magnetic Thickness Tool (MTT) is an electromagnetic measurement system that evaluates variations in casing wall thickness without requiring physical contact or destructive testing. It employs a circumferential array of magnetic sensors that detect changes in the electromagnetic field induced by variations in metal thickness-providing both quantitative thickness curves and circumferential profiles of the tubulars.
Unlike traditional mechanical calipers that only measure inner diameter variation, MTT reveals actual wall loss due to corrosion, wear, pitting, and structural degradation, including on external surfaces hidden behind tubing offering a more complete picture of casing health.
Our Magnetic Thickness Tool (MTT)
A cased-hole logging solutions provider.
Technical Parameters
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General Specs |
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Diameter |
43mm (1-11/16in) |
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Temperature Rating |
-20℃-175℃ (-20°F-347°F) |
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Pressure Rating |
100Mpa |
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Length |
1750mm(68.9in) |
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Weight |
8.25kg |
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Measurement Range |
60-473mm |
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Outer Casing Material |
TC18 |
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Number of Test Curves |
127 |
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Logging Speed |
400m/h (22ft/min) |
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First Pipe |
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Maximum Casing Thickness |
20mm (0.78in) |
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Thickness Accuracy |
0.190mm(0.0075in) |
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Casing Longitudinal Minimum Crack |
0.08*Casing Circumference |
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Second Pipe |
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Maximum Casing Thickness |
18mm (0.7in) |
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Thickness Accuracy |
0.254mm(0.01in) |
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Casing Longitudinal Minimum Crack |
0.18*Casing Circumference |
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Third Pipe |
|
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Maximum Casing Thickness |
16mm (0.63in) |
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Thickness Accuracy |
1.52mm(0.06in) |
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Casing Longitudinal Minimum Crack |
0.27*Casing Circumference |
Key Features & Technical Advantages
Quantitative Thickness Evaluation
◆ Delivers absolute wall thickness measurements across single and multiple concentric tubulars.
◆ Capable of measuring internal and external metal loss in casing and liner strings.
Corrosion & Damage Identification
◆ Detects pitting, gradual wall loss, holes, and cracks with high sensitivity.
◆ Enables differentiation between normal wear and critical damage requiring intervention.
Through‑Tubing Deployment
◆ Slim tool design (typically 43 mm OD) allows logging without pulling production tubing-reducing rig time and costs.
Robust Downhole Performance
◆ Rated for typical downhole environments (pressure up to ~100 MPa, temperatures up to ~175 °C).
◆ Works reliably with various logging systems and conveyance methods (wireline, memory mode).
Field Applications in Oil & Gas Operations
The Magnetic Thickness Tool (MTT) serves a broad range of critical downhole integrity applications:
Casing & Tubular Health Evaluation
Assess overall metal loss due to corrosion and wear essential for long‑term surveillance of well integrity and safety.
Corrosion Leak Prediction
Quantitatively track progressive wall thinning to predict failure risk before a leak or rupture occurs.
Multi‑String Analysis
Measure concentric casing strings simultaneously (up to three in some tools)-particularly valuable in older fields with complex completions.
Integrated Logging with Caliper/MIT Tools
Combine MTT with Multi‑Finger Caliper or Multifinger Imaging Tools to correlate inner geometry changes with actual wall loss, yielding true structural insight beyond conventional caliper logs.
Why Choose Our Magnetic Thickness Tool?
◆ Proven Measurement Technology-Based on robust electromagnetic induction physics with field‑tested reliability.
◆ High Sensitivity & Coverage-Circumferential sensors capture full metal loss profiles for actionable interpretation.
◆ Comprehensive Analysis-Supports standalone measurements or integrates with other logging tools for advanced evaluation.
◆ Field‑Ready Durability-Engineered for harsh downhole environments encountered in deep, high‑temperature, and high‑pressure wells.
◆ Cost‑Efficient Operations-Through‑tubing deployment eliminates costly workovers and minimizes rig time.
Precision Wall Thickness Logging for Operational Confidence
The Magnetic Thickness Tool (MTT) stands as a scientifically grounded, field‑proven solution for casing integrity evaluation and tubular wall thickness measurement. Its capability to detect and quantify metal loss, combined with flexible deployment and advanced data processing, empowers operators with reliable data to make informed decisions about well maintenance, safety, and future production planning.
Whether evaluating aging wells, conducting integrity audits, or planning remediation strategies, MTT delivers accurate, repeatable, and engineering‑grade measurements to maximize well service life and minimize unplanned downtime.
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