True Triaxial Testing for Deep Reservoir Fracture and Fluid Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing research on deep oil and gas reservoirs fails to accurately simulate the thermal-hydrological-mechanical coupling effects under high-temperature, high-pressure, and high-stress conditions, lacking a platform that can truly reflect the in-situ stress state and structural characteristics of deep formations, and there is a need for comprehensive experiments to understand fracture propagation and fluid flow mechanisms.
Innovation Solution
A thermal-hydrological-mechanical-chemical coupling exploitation experimental device for deep oil and gas reservoirs, incorporating a true triaxial pressure loading mechanism, temperature control, and monitoring systems, capable of simulating high-temperature, high-pressure, and high-stress environments, and performing large-scale rock mechanics and seepage experiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional simulation devices are used for rock experiments, then device complexity is reduced, but the ability to simulate thermal-hydrological-mechanical coupling effects under high-temperature, high-pressure, and high-stress conditions deteriorates
Solution Approach 1:
The experimental device is divided into multiple independent functional modules: true triaxial loading system, temperature control system, fluid injection system, and monitoring system. Each module can be independently controlled and optimized, allowing complex thermal-hydrological-mechanical coupling simulations while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The device employs a nested structure where the sample chamber is positioned within the true triaxial loading frame, which is surrounded by temperature control systems, and all components are integrated within a unified control architecture. This nested arrangement allows multiple simulation functions (mechanical loading, thermal control, fluid injection) to operate simultaneously on the same rock sample.
2Manufacturing precision
If true triaxial pressure loading mechanism is implemented, then the ability to restore in-situ stress state is improved, but device complexity increases
Solution Approach 1:
The true triaxial loading system applies different stress conditions to different directions of the rock sample independently, with separate loading mechanisms for horizontal and vertical stresses. This localized control of stress application allows precise restoration of in-situ stress states while managing complexity through directional independence of loading mechanisms.
Solution Approach 2:
The true triaxial loading mechanism serves multiple functions: applying confining pressure, inducing shear stress, and simulating various in-situ stress conditions. This multi-functional design consolidates what would otherwise require separate experimental setups into a single integrated system, improving stress state restoration capability without proportionally increasing overall device complexity.
3Reliability
If large-scale rock samples are used for experiments, then the ability to represent rock mass structural characteristics is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
Multiple sensors including strain gauges, pressure transducers, and displacement transducers are pre-installed on and within the rock sample before the experiment begins. This preliminary instrumentation ensures that measurement points are optimally positioned and that data collection systems are calibrated before the complex thermal-hydrological-mechanical loading is applied, facilitating accurate measurement of large-scale sample behavior.
Solution Approach 2:
The patent employs intermediate measurement devices such as strain gauges and pressure transducers that convert complex mechanical and thermal fields into measurable electrical signals. These intermediary sensors facilitate the detection and measurement of large-scale rock sample responses to thermal-hydrological-mechanical coupling effects by translating physical phenomena into quantifiable data.
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 simulation of deep oil and gas reservoir conditions, allowing for detailed analysis of fracture propagation and fluid flow, and providing insights into the thermal-hydrological-mechanical-chemical interactions that influence rock properties and fluid behavior.
Implementation Method 1
a temperature control system arranged on the true triaxial pressure loading mechanism
Implementation Method 2
a true triaxial pressure loading mechanism arranged on the loading bin
Implementation Method 3
a detection element of the monitoring system is arranged in the rock sample and the sample holding bin
Data Source
AI summary
Provided are a thermal-hydrological-mechanical-chemical coupling exploitation experimental device for a deep oil and gas reservoir, and a simulation system. The device includes a loading bin, a sample holding bin, a true triaxial pressure loading mechanism arranged on the loading bin, a temperature control system arranged on the true triaxial pressure loading mechanism, and a monitoring system having a detection element arranged in the rock sample and the sample holding bin. A sample entry port is formed in one side surface of the loading bin. The sample holding bin has one end slidably arranged in the sample entry port, can be sealed and connected with the sample entry port, and is configured for placing and fixing a rock sample. Multiple through holes are uniformly formed on an outer end cover of the sample holding bin and are configured for detecting and adding water, gas, and oil.