A comparison of new ultrasonic cement and casing evaluation logs with standard cement bond logs
New ultrasonic inspection techniques have been implemented to evaluate cement bond and casing conditions. These techniques, relying on state of the art downhole, high-speed waveform digitization, can successfully determine cement voids and channels and also provide accurate bond information in the presence of a microannulus. The downhole microprocessor controlled electronics transmits the digitized waveforms to the surface for computations and display. The downhole waveforms are then viewed by the operator in real time to insure proper log quality. Numerous log examples showing comparisons with the standard Cement Bond Log (CBL) demonstrate that the accuracy and resolution of the new approach provide much more information. Casing conditions are determined using both acoustic caliper measurements and a new casing thickness measurement technique. The acoustic caliper measurement not only determines accurately the casing inside diameter, but also detects the pipe gap at casing collars. The new measurement determines actual casing thickness variations due to internal or external pipe wear or corrosion. Experimental results along with log examples show the effectiveness and accuracy of measuring the actual casing thickness at the well site in real time.
- Research Organization:
- Gearhart Industries Inc.
- OSTI ID:
- 6975304
- Report Number(s):
- CONF-861080-
- Resource Relation:
- Conference: Society of Petroleum Engineers annual technical conference and exhibition, New Orleans, LA, USA, 5 Oct 1986
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cement evaluation tool: a new approach to cement evaluation
Evaluate cement with radioactive tracers, directional gamma ray logs
Related Subjects
03 NATURAL GAS
CALIPER LOGGING
COMPARATIVE EVALUATIONS
CEMENTS
SONIC LOGGING
NATURAL GAS WELLS
CEMENTING
OIL WELLS
ULTRASONIC WAVES
WELL CASINGS
CORROSION
DIGITAL SYSTEMS
DIMENSIONS
DRILL PIPES
MEASURING METHODS
MICROPROCESSORS
REAL TIME SYSTEMS
SLEEVES
THICKNESS
WAVE FORMS
WEAR
WELL COMPLETION
WELL LOGGING EQUIPMENT
BUILDING MATERIALS
CHEMICAL REACTIONS
COMPUTERS
DRILLING EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
MATERIALS
MICROELECTRONIC CIRCUITS
PIPES
SOUND WAVES
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration