Predicting Temporary Plugging Agent Fracture Pressure
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Solution Overview
Problem
Current methods for evaluating the plugging ability of temporary plugging agents in oil and gas engineering are time-consuming and costly, relying on indoor experiments that consume significant resources and time, making it difficult to quickly and conveniently assess their effectiveness before use.
Innovation Solution
A method and device that predict the plugging ability of temporary plugging agents by calculating the fracture pressure of artificially created cracks using elastic modulus, rock fracture toughness, and confining pressure, simplifying the experimental process and reducing costs through theoretical calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indoor experiments are used to evaluate plugging ability, then measurement precision is improved, but loss of time and experiment cost increase
Solution Approach 1:
The patent performs preliminary actions by obtaining rock mechanical parameters (elastic modulus, Poisson's ratio) and fracture toughness (KIC) before the actual plugging ability evaluation. These preliminary results are then used in the predictive model to calculate fracture pressure, avoiding the need for time-consuming indoor plugging experiments while maintaining evaluation accuracy.
Solution Approach 2:
The patent creates a theoretical model that copies the essential physical relationships of the plugging process. By using the predictive model with formulas that relate fracture pressure to rock properties and filter cake thickness, the system replicates the evaluation function without requiring physical experimentation, thus saving time and resources.
2Measurement precision
If indoor experiments are used to evaluate plugging ability, then measurement precision is improved, but experiment cost increases
Solution Approach 1:
The patent creates a theoretical model that copies the essential physical relationships of the plugging process. By using the predictive model with formulas that relate fracture pressure to rock properties and filter cake thickness, the system replicates the evaluation function without requiring physical experimentation, thus saving time and resources.
Solution Approach 2:
The patent replaces the mechanical experimental system with a theoretical calculation system. Instead of using physical testing equipment and materials to evaluate plugging ability, the system uses mathematical models and formulas to predict fracture pressure, substituting expensive and complex experimental apparatus with computationally efficient calculations.
3Productivity
If theoretical calculation is used to predict plugging ability, then productivity is improved, but measurement precision may decrease
Solution Approach 1:
The patent performs preliminary actions by obtaining rock mechanical parameters (elastic modulus, Poisson's ratio) and fracture toughness (KIC) before the actual plugging ability evaluation. These preliminary results are then used in the predictive model to calculate fracture pressure, avoiding the need for time-consuming indoor plugging experiments while maintaining evaluation accuracy.
Solution Approach 2:
The patent uses parameter changes by incorporating multiple rock mechanical parameters (elastic modulus E, Poisson's ratio v, fracture toughness KIC) and experimental parameters (confining pressure Pc, filter cake thickness wc, crack height H) into the predictive model. By changing and combining these parameters in the fracture pressure calculation, the model achieves accurate predictions while maintaining high productivity.
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
This approach allows for a standard and specific fracture pressure calculation method, reducing the need for extensive testing and lowering the time and cost associated with evaluating temporary plugging agents, while providing a more efficient means to assess their plugging ability.
Implementation Method 1
acquiring the thickness wc of a filter cake forming a temporary plugging body in the crack with the width of w
Data Source
AI summary
The present disclosure relates to a method and a device for predicting ability of a temporary plugging agent to plug cracks and a storage medium, and includes the following steps: calculating a plane elastic modulus of a core through experiments, acquiring a maximum force load of a specimen, calculating rock fracture toughness through the maximum force load, manufacturing an artificial crack model and placing it in a core holder, preparing temporary plugging deflection fluid by selecting a temporary plugging agent, injecting the temporary plugging deflection fluid into the artificial crack so as to calculate apparent fracture toughness of the temporarily plugged crack, and finally calculating a fracture pressure of the temporarily plugged crack based on the calculated rock fracture toughness and the plane elastic modulus of the core. Through the above method, the present disclosure provides a standard fracture pressure calculation method.