Liquid Nitrogen Pump Testing via Water-Gas Mixing
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Solution Overview
Problem
Current test and experiment technologies for liquid nitrogen pump equipment with high pressure and large displacement in nitrogen foam fracturing are inadequate, posing safety risks due to difficulty in adjusting and monitoring discharge pressure, and existing apparatuses are not suitable for high-pressure, high-displacement operations.
Innovation Solution
An apparatus comprising a liquid nitrogen pump testing unit, hydraulic damping apparatus, and pressure adjusting unit that mixes gaseous nitrogen with high-pressure water to form a high-pressure liquid-gas mixture, allowing for indirect adjustment of discharge pressure using pneumatic and motor-driven valves, reducing safety risks and enabling precise control of discharge pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct pressure regulation valves are used to adjust discharge pressure of high-pressure gas, then pressure adjustment capability is improved, but safety risk and technical difficulty increase significantly
Solution Approach 1:
The patent introduces water as an intermediary medium to indirectly adjust gas discharge pressure. Instead of directly regulating high-pressure gas with pressure valves (which poses safety risks), the system regulates water pressure and uses a water-gas mixing device where the water-gas ratio control indirectly controls the equivalent discharge pressure of the gas. This mediator approach transforms a high-risk direct gas pressure control problem into a safer liquid pressure control problem.
Solution Approach 2:
The patent employs hydraulic principles by using high-pressure water flow to carry and control the discharge of gaseous nitrogen. The hydraulic system with pump, water tank, and pressure-regulated water flow provides a stable, controllable medium that can safely handle the pressure transmission and mixing functions, replacing direct pneumatic pressure regulation of gas.
2Adaptability or versatility
If existing loading experiment apparatus is used for low-pressure, low-displacement equipment, then testing capability is sufficient, but it cannot meet the requirements of high-pressure, high-displacement nitrogen foam fracturing equipment
Solution Approach 1:
The patent creates a multi-functional test system that can handle both liquid nitrogen pumping performance testing and gas discharge pressure loading testing through a unified water-gas mixing apparatus. The system serves multiple purposes: it tests pump flow rate, regulates gas pressure indirectly, and provides a safe discharge path for high-pressure gas, making the test equipment versatile enough to handle high-pressure, high-displacement applications that existing specialized equipment cannot accommodate safely.
3Adaptability or versatility
If huge pressure regulating valves are used to adjust high-pressure gas discharge, then pressure control range is improved, but device complexity and technical difficulty increase
Solution Approach 1:
The patent replaces complex huge pressure regulating valves for direct gas pressure control with a simpler water-gas mixing system. The water acts as an intermediary that simplifies the pressure control mechanism - instead of needing large, complex gas valves to handle high-pressure gas directly, the system uses water pressure regulation (which is technically simpler and safer) combined with gas injection to achieve the same pressure control effect through water-gas ratio adjustment.
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 apparatus safely and accurately adjusts discharge pressure and flow rate of liquid nitrogen pump equipment, reducing technical and safety risks, and allows for comprehensive testing of high-pressure, high-displacement nitrogen foam fracturing systems, ensuring secure operation and data collection.
Implementation Method 1
pumps liquid nitrogen stored at low pressure and low temperature in the liquid nitrogen tank and converts it into gaseous nitrogen at normal temperature and high pressure
Implementation Method 2
the manifold system mixes the gaseous nitrogen at normal temperature and high pressure from the liquid nitrogen pump equipment with high pressure water from the pump set equipment to form a high pressure liquid-gas mixture
Implementation Method 3
The pressure adjusting unit pressurizes the water discharged from the hydraulic damping apparatus unit by adjusting the flow rate of the high pressure liquid-gas mixture
Data Source
AI summary
The disclosure relates to liquid nitrogen pump equipment load testing and experimenting apparatus, and testing and experimenting method thereof, used for oil-gas fields or coalbed methane nitrogen foam fracturing equipment testing. A hydraulic damping apparatus unit and a pressure regulation unit are provided; the hydro-mechanical damping apparatus unit comprises a water tank, a pump unit apparatus, and a pipe manifold system connected in sequence.