1. n. [Formation Evaluation] A presentation of the acoustic waveform at a receiver of a sonic or ultrasonic measurement, in which the amplitude is presented in color or the shades of a gray scale.

Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques used to evaluate cement-casing-formation bonds before the well testing or execution of the production operation in the well. These logs are also crucial during the workover operation to maintain the integrity of the well.

VDL is the top view of the cut away of upper part of acoustic wave that represents how cement bond from casing to wellbore. Caliper: Caliper measures wellbore diameter. Example of CBL is shown below.

CEMENT BOND LOG INTERPRETATION. The Cement Bond Log (CBL) gives a continous measurement of the amplitude of sound pulses from a transmitter to receiver. This amplitude is maximum in unsupported pipe and minimum in well-cemented casing.

The radial cement bond tool (CBL) utilizes a single ceramic transmitter, an eight segment receiver at 3ft. spacing to accurately measure the quality of the cement job in a cased hole well environment. The segmented receiver provides a good indication of cement channeling behind the casing.

A cement bond log (CBL) documents an evaluation of the integrity of cement job performed on an oil well. It is basically a sonic tool which is run on wireline. Similar to a ringing bell, when no cement is bonded to the casing, pipe is free to vibrate (loud sound).

A cement bond log documents the evaluation of the integrity of cement work performed on an oil well. A sonic tool is typically run on wireline by a service company that detects the bond of the cement to the casing and formation via a principle based on resonance.

A log that uses the variations in amplitude of an acoustic signal traveling down the casing wall between a transmitter and receiver to determine the quality of cement bond on the exterior casing wall.

The colour of cement gives an indication of excess lime or clay and the degree of burning.

1. RUBBING. Take a pinch of cement between fingers and rub it.
2. HAND INSERTION. Thrust your hand into the cement bag and it should give cool feeling.
3. FLOAT TEST.
4. SMELL TEST.
5. PRESENCE OF LUMPS.
6. SHAPE TEST.
7. STRENGTH TEST.

The USI* UltraSonic Imager tool (USIT) uses a single transducer mounted on an Ultrasonic Rotating Sub (USRS) on the bottom of the tool. The transmitter emits ultrasonic pulses between 200 and 700 kHz and measures the received ultrasonic waveforms reflected from the internal and external casing interfaces.

A cement bond log documents the evaluation of the integrity of cement work performed on an oil well. In the process of drilling and completing a well, cement is injected through the wellbore and rises up the annulus between the steel casing and the formation.