Expandable Geopolymer Lost Circulation Test Method
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Solution Overview
Problem
Current methods for testing lost circulation materials, particularly expandable geopolymers, are inadequate as they lack particles to effectively plug apertures and prevent fluid loss during oil drilling.
Innovation Solution
A method utilizing a permeability plugging tester with a test cell, where drilling fluid is loaded, an expandable geopolymer is placed on top, and the system is subjected to controlled temperature and pressure to evaluate the geopolymer's ability to prevent fluid loss, with glass paper preventing mixing and the geopolymer expanding and solidifying to fill slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LCM testing methods are used for expandable geopolymers, then the test can be performed with existing equipment, but the test cannot accurately evaluate the plugging capability because geopolymers lack particles to plug apertures
Solution Approach 1:
The patent changes the testing parameters by introducing temperature as a critical variable. The test cell is heated to activate the expandable geopolymer, causing it to expand and plug the aperture. This parameter change enables accurate evaluation of geopolymers' plugging capability without requiring particle-based LCM mechanisms
Solution Approach 2:
The testing method segments the evaluation process into distinct phases: initial fluid loss measurement, geopolymer addition, temperature-induced expansion, and final plugging effectiveness measurement. This segmentation allows for precise measurement of the geopolymer's expansion and plugging properties separately from traditional particle-based LCM performance
2Reliability
If expandable geopolymer is used to prevent fluid loss, then fluid loss prevention capability is improved, but the material requires temperature activation and expansion time
Solution Approach 1:
The patent applies preliminary action by pre-heating the test cell before adding the geopolymer. This ensures that when the geopolymer is introduced, it immediately begins expanding without waiting for temperature equilibration, thereby reducing the overall activation time while maintaining reliable fluid loss prevention
Solution Approach 2:
The patent utilizes the phase transition of the expandable geopolymer from a dormant state to an expanded solid state through temperature activation. This phase transition enables the material to rapidly increase in volume and plug the aperture, achieving reliable fluid loss prevention with controlled timing
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
Effectively assesses the lost circulation prevention capability of expandable geopolymers by measuring fluid leakage, demonstrating their ability to seal apertures under pressure, with minimal fluid loss observed even at high pressures.
Implementation Method 1
increasing the temperature within the test cell, wherein the geopolymer expands and solidifies
Implementation Method 2
the geopolymer starts expanding and plugging the slot while simultaneously solidifying
Data Source
AI summary
The disclosure includes a new test method of evaluating lost circulation prevention with expandable geopolymers. The expandable geopolymer is tested using a permeability plugging tester, slot disk, drilling fluid, and a piston to determine how much fluid is released from the test cell.