SHW-1Simulation device for natural gas hydrate extraction

1Purpose and significance of the experiment

The natural gas hydrate exploitation simulation device can simulate the formation process of hydrate reservoirs in the laboratory, focusing on the physical simulation and exploitation mechanism of conventional exploitation methods such as heat injection and depressurization processes, and exploring economically effective exploitation methods. By evaluating the comprehensive benefits of different hydrate exploitation methods such as heat injection exploitation, depressurization exploitation, and inhibitor injection exploitation, the timing of succession between different exploitation methods can be determined when multiple methods are jointly developed. Addressing major academic issues such as the transport patterns of gas and liquid in sediment during hydrate extraction, spatial distribution of temperature field, advancement speed of hydrate decomposition front, and mechanism of hydrate decomposition: evaluating the comprehensive benefits of different hydrate extraction methods.

IIBasic structure composition of experimental system

The experimental system includes the following7Main functional modules: （1）Stable voltage supply module; （2）Stable pressure gas supply module; （3）Environmental simulation module; （4）Backpressure control module; （5）Measurement module; （6）Data collection module, etc;

The high-voltage model is the core component in the system and is placed in a constant temperature chamber. In addition, gas is injected into the model through a pressure stabilizing gas supply module to supplement gas or maintain system pressure; The stable pressure supply module injects liquid into the model, including water and various solutions, accurately and quantitatively, and has the function of heating the solution. When conducting hydrate extraction experiments, the back pressure control module is used to control the outlet pressure of the model. Pressure control is crucial in extraction experiments such as pressure reduction and heat injection. The gas and liquid generated from the mining experiment are separated by a gas-liquid separator and then measured separately.

IIISpecification

1. working pressure:0~16MPAMeasurement accuracy:0.01MPA
2. Working temperature:-10~150℃, control accuracy: ±1℃
3. Liquid flow rate:0~20ml/minAccuracy:0.01ml
4. Gas flow rate:0~500ml/min,Accuracy:0.1ml
5. Power supply: AC380V,50HZ
6. Power:6KW

4Technical indicators of each component in the system

This device is mainly used to simulate the formation and extraction process of natural gas hydrates on the seabed, and is mainly composed of the following components.

1. Liquid supply system

The liquid supply is mainly completed by a horizontal flow pump, using the horizontal flow pump from Beijing Satellite Factory, with a flow range of this pump0.01~20ml/min,Pressure Range0~20MPA.

The pump has a computer communication interface, which can be controlled by a computer to operate or manually operated.

1. Liquid storage system

cause3onlyZR-3type1000ml/20MPAComposition of piston container.

Used for storing displacement media and serving as a pressure buffer during the displacement process.

1. Measurement of liquid injection volume

Using a parallel flow pump for metering

When setting the instantaneous injection flow of the parallel flow pump, the computer records the injection time and calculates the cumulative injection amount at different times.

1. pressure reducing valve

selectTESCOMCompany product, model44-1812-24Import pressure6000psiExport pressure0~2500psiAdjustable.

1. Injection gas metering

Measurement using high-pressure gas mass flowmeter

Flow meter model:D07-12M/ZM,Instantaneous flow range:500/min

Flow totalizer model:D08-8M/ZM

The injection amount is collected and saved in real-time by the computer.

1. preheater

Used for heating the injected fluid and automatically controlling the temperature of the injected fluid.

Temperature control range: room temperature~150℃, control accuracy ±1℃.

1. Experimental model tube

Effective internal size φ38×500mm, withstand voltage20MPAThe center design of the pipe has4A temperature measuring device is used to accurately measure temperature gradients.

1. High and low temperature constant temperature box

Internal cavity size: long700X high450X deep450mmTemperature control range-10~100℃, temperature fluctuation: ±1The constant temperature test chamber is equipped with wheels, which can be easily moved.

The experimental model tube is installed in a constant temperature chamber.

1. pressure measurement

Measure the inlet and outlet pressures separately, both using high-precision pressure sensors with measuring ranges25MPA,Accuracy:0.1％F·S.

1. Temperature measurement

supportPT100Insert the temperature probe into the test tube to ensure that the probe is in contact with the fluid, and the temperature data is collected and saved in real time by the computer.

1. Backpressure control system

Used to control the outlet pressure, using a top loading back pressure controller, pressure resistant25MPAControl accuracy ±0.05MPAThe set pressure is displayed by a precision pressure gauge.

1. Export measurement

The export gas is measured by a gas flow meter, and the export liquid is measured by an electronic balance. The data is collected and saved by a computer.

Range of gas mass flowmeter:3000sccm

Scale range:2200g, accuracy0.01g

1. Data Acquisition System

Including computers, printers, acquisition control boards, acquisition control circuits, and data acquisition and processing software.

Timely collection: injection volume, injection volume, pressure, pressure difference, temperature, output volume, and changes in output volume.

Software inwindows7Operating in the environment, utilizingVBProgramming and instrument workflow are displayed on the interface, allowing for human-machine interaction and simple and convenient operation.

1. security alarm system

The device is designed with an over temperature and over pressure safety alarm system. When the system experiences over temperature or over voltage, it will automatically sound an alarm and cut off the power supply.