Description
The EMT‑Electromagnetic Tools series are precision down‑hole instruments designed for non‑contact electromagnetic evaluation of casing and tubular integrity in oil and gas wells. By leveraging electromagnetic induction and phase‑shift detection principles, EMT tools deliver highly accurate measurements of casing wall thickness, corrosion, metal loss, cracks, and structural anomalies in single or multiple concentric tubulars all in a single logging run. These tools are engineered to support wireline logging, through‑tubing evaluation, corrosion monitoring, and detailed 3D imaging, contributing to safer, more informed well integrity assessments.
What are EMT‑Electromagnetic Tools?
Electromagnetic Tools (EMT) are electromagnetic thickness/scanning tools used in cased‑hole logging to detect and quantify remaining wall thickness and structural damage of steel casing or tubulars without mechanical contact. The tool transmits an electromagnetic field and analyzes the received signal response to determine variations in metal thickness and surface condition. Unlike traditional mechanical calipers, EMT can assess through‑tubing conditions and multilayer tubular strings with higher sensitivity and resolution.
EMT tools commonly come in multiple configurations for multi‑casing environments. Each configuration employs an array of miniature electromagnetic sensors that obtain multiple magnetic variation signals simultaneously, enabling detailed mapping of tubular conditions during a single trip.
A-One Oil EMT‑Electromagnetic Tools
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 |
Engineering Credibility & Accuracy
Electromagnetic tools like EMT are based on well‑understood physical principles particularly electromagnetic induction and eddy current interaction in conductive media. These measurement techniques are widely adopted in industrial non‑destructive testing (NDT) and cased‑hole logging because they provide direct physical evidence of material conditions without requiring physical contact with the surface.
The dual‑sensor and multi‑sensor configurations used in EMT tools enhance detection capability, improving reliability even in multi‑string tubular environments. Integration with caliper or multifinger logs further enriches interpretation by correlating geometry changes with electromagnetic responses.
Applications in Well Integrity & Production Optimization
EMT‑Electromagnetic Tools support a wide range of oilfield applications:
◆ Casing Integrity Assessment-Evaluate remaining wall thickness and metal loss across tubular strings, helping operators understand corrosion progress and isolation risks.
◆ Corrosion & Crack Detection-Locate and characterize pits, penetrations, and crack geometries to prioritize maintenance or remediation.
◆ Through‑Tubing Inspection-Enter wells with existing completions without pulling tubing, saving rig time and reducing operational cost.
◆ Multi‑Layer Casing Evaluation-EMT tools measure both inner and outer casing walls in concentric pipe configurations for a comprehensive integrity profile.
Why Choose Our EMT‑Electromagnetic Tools?
Scientifically Verified Technology-Based on electromagnetic induction and phase‑shift principles with industry‑recognized accuracy.
High Sensitivity & Resolution-Detects subtle geometry changes and corrosion with millimeter‑level precision.
Robust Down‑Hole Performance-Designed for high temperature and pressure environments up to 175 °C and 100 MPa.
Through‑Tubing Capability-Slim design suited for tight clearances and complex well architectures.
Integrated Data Interpretation-Compatible with advanced software for 3D imaging and multi‑tool analysis.
Advanced Electromagnetic Insight for Tubular Integrity
The EMT‑Electromagnetic Tools series delivers a powerful combination of precision measurement, durable engineering, and deep interpretive insight for casing integrity and wellbore evaluation. By integrating electromagnetic measurement with advanced telemetry and imaging, EMT tools provide operators with the data confidence needed to make informed decisions, optimize maintenance programs, and extend well life all while minimizing rig time and operational risk.
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