E Log I Test Part 1 Well Casing. Beast

Unleashing the Beast of Electrochemical Testing.
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What if I told you that hidden beneath pipelines, oil wells, and steel casings lies a mysterious electrochemical Beast — one that silently eats away at our infrastructure day and night? This Beast is not a mythical creature, but something very real: corrosion.

Engineers and scientists around the world have been battling this Beast for over a century, and one of the most fascinating weapons in this war is the E log-I test (also called the Electrochemical Logarithmic Current test). In this video, you’re not just going to learn about equations and measurements — you’re going to witness how professionals tame the corrosion Beast and reveal its secrets through science, data, and engineering.

This test, outlined in standards such as NACE SP0186-2024, is one of the most powerful ways to uncover the hidden relationship between applied current and electrode potential. It is a laboratory-born procedure, transformed into a field tool, that helps engineers identify the true current requirement for protecting steel structures from the Beast of corrosion.

If you’re curious about how engineers confront the invisible enemy that weakens pipelines, offshore platforms, and storage tanks, you’re in the right place. Stay tuned until the end — because once you see how the E log-I curve reveals the Beast’s weak point, you’ll never look at corrosion the same way again.




Prerequisites:

Isolation: All metallic structures connected to the electrolyte must be electrically isolated from the target casing. This ensures the Beast’s response isn’t influenced by nearby metal “allies.”

Temporary anode bed: Placed far enough to distribute current evenly along the casing, like positioning archers before the battle.

Switching off DC sources: Any nearby rectifiers or DC systems must be turned off at least 48 hours before the test. This allows the structure to depolarize, exposing the Beast’s true nature.

Reference electrode: Positioned electrically remote, so it captures an unbiased potential reading.

Only when these conditions are met can the test begin.

The Procedure — Drawing Out the Beast

Here’s how the E log-I test unfolds:

Measure the native potential: With zero current, the casing’s natural state is recorded. This is the Beast at rest.

Apply current in increments: Starting at 0.1 A, current is applied for 2–3 minutes, then interrupted briefly to measure the instant-off potential.

Observe the decay: The Beast reacts instantly when the current is interrupted — the potential drops, then slowly decays. The crucial number is taken just before the decay begins.

Increase current: Step by step, current levels are raised (0.1 A to 2.0 A, or higher if needed). Each step reveals more about the Beast’s behavior.

Identify the breakover point: The E log-I curve eventually reveals the threshold where protection is achieved — the point where the Beast’s power is broken.

Interpreting the Curve — Reading the Beast’s Mind

The resulting E log-I curve is a treasure map for corrosion engineers. On a semi-logarithmic plot:

Point A: The intersection, where current begins to truly control corrosion.

Point B: The Tafel slope region, where the current requirement for cathodic protection is clearly visible.

This is the Beast’s secret. By identifying these points, engineers can calculate the true protection current — ensuring the structure is neither under-protected (leaving the Beast free to attack) nor over-protected (wasting energy and risking hydrogen embrittlement).

Applications — Where the Beast Appears

The E log-I test has been used in:

Oil and gas wells: Determining the current needed to protect well casings.

Underground pipelines: Understanding the Beast’s reach in complex soil environments.

Marine structures: Fighting corrosion in offshore platforms, docks, and subsea pipelines.

Research laboratories: Teaching future engineers how to tame the Beast.


Why Watch This Video?

This isn’t just a technical tutorial. It’s a journey into the hidden world of corrosion science. You’ll see:

Step-by-step explanations of the E log-I procedure.

Real-world insights into how the corrosion Beast is measured and controlled.

Clear diagrams and animations that turn complex science into visual storytelling.

Expert commentary from decades of experience in cathodic protection engineering.
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