What is the Purpose of Electro Magnetic Interference Tool Testing?

The Electro Magnetic Interference Tool is an important device in the field of petroleum logging for detecting the thickness, corrosion, cracks, deformation and other damages of downhole metal pipe strings (such as tubing and casing). It is based on the principle of electromagnetic induction and realizes non-destructive testing of the structural integrity of the pipe string by analyzing the changes in the electromagnetic characteristics of the pipe string.

Core Working Principle

The tool transmits a low-frequency electromagnetic field into the casing through a transmitting coil. This field penetrates the casing wall and induces eddy currents within it. The casing's thickness and electrical conductivity (influenced by material and temperature) alter both the distribution and the decay characteristics of these eddy currents.

◆ When the casing is intact, the signal picked up by the receiver coil exhibits a specific pattern and amplitude.

◆ If wall thinning (corrosion), perforations, or cracks are present, the eddy-current paths are disturbed, producing characteristic changes in signal amplitude and phase.

◆ Through sophisticated signal processing and inversion algorithms, these variations are quantitatively converted into remaining wall thickness or the severity of corrosion damage.

The fundamental purpose of Electro Magnetic Interference Tool is to evaluate wellbore integrity, extend the service life of oil wells, and ensure safe production. The specific test purposes include:

◆ Diagnosing Casing Corrosion & Damage

Quantify wall-thickness loss–Accurately measure remaining casing thickness to determine corrosion severity (e.g., localized pitting or large-area uniform thinning).

Locate damage positions–Accurately identify the depth and location of defects such as perforations, cracks, and thread leaks.

Differentiate corrosion types–Identify whether corrosion is on the inner wall, outer wall, or both simultaneously.

◆ Evaluating Wellbore Integrity Risk
Preventive maintenance–Identify "high-risk" zones of severe wall thinning before leakage occurs, providing the basis for planning remedial work (e.g., casing patch, reinforcement, sidetrack).
Leak detection–Locate casing leak points when wellhead pressure anomalies, sudden changes in produced-fluid water cut, or inter-zonal communication are observed.
Well repair effect evaluation–Verify sealing integrity and mechanical strength of the repaired zone after casing remediation (e.g., patch installation, cement squeeze).

◆ Ensure Production Safety & Environmental Protection

Prevent blowouts and losses–Timely detection of tubular damage stops fluid migration and protects freshwater aquifers; periodic thickness surveys are a critical safety barrier.

Extend well life–Early detection and remediation prolong the productive life of oil and gas wells.

Meet regulatory requirements–Many national mining/energy regulators require periodic integrity assessments of aging wells; electromagnetic thickness logging is a key verification method.

◆ Guide Engineering Operations & Maintenance Decisions

Preventive inspection–Regularly inspect old wells and high-risk wells to prevent production accidents caused by casing damage.

Workover decision support–It provides quantitative basis for major overhauls, ash squeezing, pipe string replacement, etc.

Aid scale & foreign-object identification–In combination with a well diameter gauge and others, distinguish whether the inner diameter change is caused by scaling or damage to the pipe string.

 

Our Electro Magnetic Interference Tool

 

A cased-hole Logging solutions provider

◆ Regular census and evaluate of casing-damage wells in old oil fields;

◆ Pre-workover / pre- side drilling casing-integrity checks;

◆ Safety monitoring of high-pressure / high-risk wells;

◆ Tubular-integrity surveillance of water-injection and gas-production wells.

The Electro Magnetic Interference Tool is the "internist" of oil wells, using electromagnetic waves to conduct "X-ray inspections" on metal casings. The core purpose of the test is to shift from "post-event remediation" to "pre-event prevention". By precisely quantifying the corrosion and damage status of the casing, it provides irreplaceable scientific data for the safe production, life management, risk control and maximization of economic benefits of oil wells.

It achieves precise measurement of key parameters such as the thickness, corrosion, cracks and deformation of downhole metal pipe strings through electromagnetic induction non-destructive testing, providing scientific decision-making basis for the safe and efficient production of oil and gas wells. It has extremely important engineering significance and economic value in the middle and later stages of oilfield development.

Welcome to contact us to learn more about our tools via e-mail info@a-oneoil.com