Cross-Hole Sonic Logging (CSL) — Sonic Test This is a high accuracy ultrasonic test, usually for bored piles with tubes. How it is done 1. Install CSL tubes inside pile cage before concreting. 2. After concrete sets, fill the tubes with water. 3. Lower transmitter in one tube and receiver in another. 4. Ultrasonic waves travel through the concrete between the tubes. 5. Device measures how fast or slow the wave passes. What CSL tells you • Very accurate detection of honeycombing • Weak concrete z

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Logging While Drilling (LWD) LWD is a technique used in oil and gas exploration to collect real-time formation evaluation data while drilling a well. It is an essential part of modern drilling operations, providing valuable information about the subsurface without requiring separate wireline logging runs. LWD involves the use of specialized downhole tools that are integrated into the Bottom Hole Assembly (BHA). These tools measure various properties of the formation and transmit the data to the