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1. Experimental determination of hydrate decomposition rate in sediments

To develop and utilize natural gas hydrate resources, it is crucial to efficiently decompose the natural gas hydrates stored in sediments. Studying the decomposition mechanism of hydrates and the multiphase flow mechanism in hydrate reservoirs is a prerequisite for safe and efficient exploitation of natural gas hydrates. Experimental setup Figure 75.14 is a device for simulating the decomposition rate of hydrates. The device consists of three independent decomposition systems, which can use the same temperature and different pressure conditions to synthesize and decompose three hydrate samples in parallel. The reaction vessel is made of stainless steel, with an inner cylinder diameter of 30mm and a height of 50mm, and can withstand a maximum pressure of 30MPa. The bottom of the reaction vessel is equipped with an upright Pt100 thermistor thermometer to monitor the temperature inside the vessel. The reaction kettle is placed in a water bath with a controllable temperature range of -10 to 100 ℃ and a temperature control accuracy of 0.1 ℃. The pressure sensor is installed at the top of the reaction vessel before the release gas pressure regulating valve, with a maximum working pressure of 30MPa and an accuracy of 0.01%. The constant pressure state during the decomposition of hydrates is achieved through four pressure regulating valves on the decomposition gas output pipeline. The first three are manual pressure regulating valves, and the fourth is an induction type automatic pressure regulating valve. The automatic pressure regulating valve consists of a pressure regulating valve, a rotating motor, a data controller, etc. The working princip

le is that the pressure sensor transmits real-time pressure signals inside the reactor to the computer. When the pressure inside the reactor is different from the experimental set value, the computer will start the rotating motor to control the opening and closing degree of the pressure regulating valve through the motor, achieving the purpose of stabilizing the pressure. A mass flow meter is installed after the pressure regulating valve to monitor the forward flow rate and cumulative flow rate of the decomposed gas. Figure 75.14 Simulation Experiment Device for Natural Gas Hydrate Decomposition Rate Experimental Technology and Method Porous media involves drying and sieving natural seabed sediments to separate samples of different particle sizes. Using deionized water or seawater, a 0.03% solution of sodium dodecyl sulfate (SDS) is prepared to accelerate the reaction rate. The entire experimental process consists of two parts: the artificial synthesis of methane hydrate and the monitoring of hydrate decomposition under different conditions. After the synthesis of hydrates, two methods are used for their decomposition: 1) equal volume temperature decomposition. After the formation of hydrates, stop introducing high-pressure methane gas into the reaction vessel and close the constant temperature water bath to allow the temperature of the reaction vessel to naturally rise. When the temperature and pressure conditions inside the kettle exceed the phase equilibrium point where the hydrate is stable, the hydrate decomposition reaction gradually proceeds. Record the temperature and pressure growth curves inside the reaction vessel during this process, and calculate the decomposition reaction rate. 2) Constant pressure decompos

gas flow measurement

1. Experimental determination of hydrate decomposition rate in sediments

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