Drilling Fluid Inhibition Evaluation Device for High-Temperature Pressure Accuracy
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Solution Overview
Problem
Conventional drilling fluid inhibitor evaluation devices face challenges in accurately simulating in-situ stress conditions and evaluating hydration expansion characteristics of rock samples under high-temperature and high-pressure conditions, leading to errors due to vapor pressure issues and fluid state changes, as well as a lack of detailed investigation into structure changes during expansion.
Innovation Solution
A drilling fluid inhibition evaluation device comprising a main test member, a gas source, a circulation heating system, a central control system, and an ultrasonic detector, which includes a temperature control pressurization system and a confining pressure pump to simulate in-situ stress conditions, pre-pressurize and pre-heat the experimental fluid, and monitor rock sample expansion and internal structure changes in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature experimental fluid is directly injected into the closed container, then the system can achieve high-temperature conditions for evaluation, but the saturation vapor pressure of the fluid causes non-negligible change of experimental set pressure, leading to pressure deviation and measurement accuracy loss
Solution Approach 1:
The patent pre-heats the drilling fluid to the target temperature in a heating system before injecting it into the closed container. This preliminary heating action ensures that the fluid temperature is already at the desired level, preventing temperature shock and allowing for accurate pressure measurements without vapor pressure-induced deviations.
Solution Approach 2:
The patent changes the physical state parameters of the drilling fluid by controlling its temperature and pressure conditions. By maintaining the fluid in a liquid state through proper parameter control (using a heating system and pressure control system), the patent eliminates vapor pressure interference while achieving the desired high-temperature evaluation conditions.
2Temperature
If normal temperature fluid is injected and then heated in the pressure-bearing equipment, then the fluid can reach high temperature, but instantaneous evaporation occurs when normal temperature fluid contacts high-temperature container, causing concentration changes and measurement errors
Solution Approach 1:
The patent pre-heats the drilling fluid to the target temperature in a heating system before injecting it into the closed container. This preliminary heating action ensures that the fluid temperature is already at the desired level, preventing temperature shock and allowing for accurate pressure measurements without vapor pressure-induced deviations.
Solution Approach 2:
The patent changes the physical state parameters of the drilling fluid by controlling its temperature and pressure conditions. By maintaining the fluid in a liquid state through proper parameter control (using a heating system and pressure control system), the patent eliminates vapor pressure interference while achieving the desired high-temperature evaluation conditions.
3Device complexity
If the device uses conventional expander design, then the structure is simple, but it cannot simulate in-situ stress conditions and evaluate hydration expansion characteristics accurately
Solution Approach 1:
The patent divides the evaluation device into multiple functional modules: a heating system for temperature control, a pressure control system for pressure simulation, a confining pressure pump for in-situ stress simulation, and an expander for expansion measurement. This segmentation allows each module to perform its specific function independently, achieving accurate evaluation while maintaining reasonable structural complexity.
Solution Approach 2:
The patent integrates multiple functions into a single evaluation device: temperature simulation, pressure simulation, in-situ stress simulation, and expansion measurement. The device can evaluate drilling fluid inhibition performance under various conditions (high temperature, high pressure, different confining pressures) making it a universal tool for comprehensive evaluation.
4Device complexity
If the device lacks real-time monitoring capability, then the structure is simpler, but it cannot monitor structure changes of the sample during expansion process
Solution Approach 1:
The patent incorporates an ultrasonic detector that provides real-time feedback on the internal structure changes of the rock sample during the expansion process. The detector monitors parameters such as pore pressure, fluid saturation, and structural integrity, allowing researchers to observe how the sample evolves throughout the experiment and adjust conditions accordingly.
Solution Approach 2:
The patent replaces traditional mechanical measurement methods with ultrasonic detection technology. The ultrasonic detector uses acoustic waves to penetrate the rock sample and detect internal structure changes non-contactingly, providing real-time information about pore fluid distribution, crack formation, and overall structural evolution without physically disturbing the sample.
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
The device effectively reduces vapor pressure errors, accurately evaluates rock sample expansion, and monitors structural changes, enabling the selection of appropriate drilling fluid inhibitors and improving drilling fluid performance by simulating real formation conditions and reducing temperature and pressure discrepancies.
Implementation Method 1
a circulation heating system, a central control system and a computer, the main test member connected with the gas source, a first circulation pipeline in the circulation heating system circularly extending into the main test member
Implementation Method 2
a temperature control pressurization system, a confining pressure pump, an ultrasonic detector and a safety valve arranged outside of the main test member
Implementation Method 3
an ultrasonic detector and a safety valve arranged outside of the main test member, the main test member connected with the confining pressure pump; a probe of the ultrasonic detector arranged within the main test member
Data Source
AI summary
A drilling fluid inhibition evaluation device includes a main test member, a temperature control pressurization system, a gas source, a circulation heating system, a confining pressure pump, a central control system, a computer, an ultrasonic detector and a safety valve electrically connected through pipelines, respectively, the main test member and the temperature control pressurization system sequentially connected with the gas source; the present disclosure can pre-pressurize experimental fluid and then inject the fluid into a dilatometer, so as to prevent the fluid from generating obvious changes of phase states, eliminate pressure setting errors caused by a saturated vapor pressure of the fluid, improve accuracy of evaluation results, inspect a real expansion state of the sample and simultaneously monitor structural change characteristics of a rock sample in real time through reflection conditions of sound waves.