Cement Analyzer Gas Migration and Gel Strength
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Solution Overview
Problem
Existing methods for analyzing cement slurry properties in oil or gas wells fail to accurately predict gas migration, compressive strength, and static gel strength under varied pressure and temperature conditions, and require extensive maintenance and cannot measure multiple properties simultaneously.
Innovation Solution
A method and apparatus utilizing a servo motor, coupling magnets, acoustic transducers, and a gas injection system to drive a paddle through a cement sample in a pressure vessel, allowing for the measurement of gas migration severity, compressive strength, and static gel strength, while maintaining the integrity and performance of the cement slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single container apparatus is used to measure compressibility, thickening time and static gel strength, then device complexity is reduced, but the ability to measure gas migration severity is lost
Solution Approach 1:
The patent integrates multiple measurement functions into a single container apparatus. The system can measure compressibility, thickening time, static gel strength, and gas migration severity using the same pressure vessel and sample container, eliminating the need for multiple separate devices while maintaining comprehensive measurement capabilities
Solution Approach 2:
The patent combines previously separate measurement systems into one unified apparatus. The load cell, paddle assembly, acoustic transducers, and gas injection system are integrated within a single container, merging multiple functions that were traditionally performed by separate devices
2Reliability
If ultrasonic energy is propagated through cement slurry to measure compressive strength, then nondestructive testing is achieved, but the ability to analyze gas migration severity is lost
Solution Approach 1:
The acoustic transducer system serves dual purposes: it measures compressive strength through ultrasonic energy propagation and simultaneously detects gas migration severity by monitoring changes in acoustic signal transmission through the cement slurry
Solution Approach 2:
The patent combines compressive strength measurement and gas migration analysis into a single integrated system using the same acoustic transducers and sample container, eliminating the need for separate testing apparatus
3Adaptability or versatility
If gas injection system is added to evaluate gas migration, then gas migration severity can be measured, but device complexity increases
Solution Approach 1:
The gas injection system is integrated with the existing pressure vessel and measurement apparatus, allowing the same equipment to perform both traditional cement slurry property measurements and gas migration evaluation without requiring entirely separate systems
Solution Approach 2:
The gas injection system is merged with the load cell, paddle assembly, and acoustic transducer system within the same container, combining previously separate functions into one unified apparatus
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate prediction of gas migration likelihood, compressive strength, and static gel strength of cement slurry under varied conditions, with reduced maintenance requirements and the ability to measure multiple properties in a single system, meeting industry standards of accuracy and ease of use.
Implementation Method 1
a pair of acoustic transducers to generate an acoustic signal and record the transit time of the acoustic signal after it transits the cement
Implementation Method 2
a servo motor and coupling magnets to drive a paddle at a very slow speed through the cement in a pressure vessel
Data Source
AI summary
The present invention pertains to a method and experimental apparatus for studying properties of cement slurry to be used in an oil or gas well under varied pressure and temperature conditions. This apparatus can be used to predict the likelihood of gas migration, compressive strength and static gel strength of cement slurry. It comprises a servo motor and coupling magnets to drive a paddle at a very slow speed through the cement in a pressure vessel, a pair of acoustic transducers to generate an acoustic signal and measure the transit time of the acoustic signal after it transits the cement, and a gas injection system to predict the severity of gas migration in cement.