Method for measuring phase equilibrium condition of gas hydrate in porous medium
A gas hydrate and porous medium technology, which is used in measurement devices, instruments, scientific instruments, etc., can solve the problems of uncertainty in equilibrium temperature, difficult to measure, and sensitive to the amount of hydrate formation, achieve a wide application background, and improve data reliability. The effect of high accuracy and measurement accuracy
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Embodiment 1
[0051] Example 1: Methane + 80-100 mesh quartz sand system (blank experiment)
[0052] This example is a blank experiment for determining the phase equilibrium conditions of methane in porous media. Experimental equipment such as figure 1 shown. The narrow tube reactor 1 has an inner diameter of 6 mm and a length of 3 m. The porous medium is quartz sand with a water saturation of 80%. The 80-100 mesh quartz sand and water are uniformly mixed and loaded into the narrow tube reactor 1. The filling length of the porous medium is 2.98m. Then the reactor 1 filled with quartz sand was placed in a constant temperature water bath 2, and the temperature of the constant temperature water bath 2 was set at 16°C. Afterwards, the reactor 1 is evacuated, and methane is fed into the reactor 1 from the inlet of the high-pressure gas tank 7, flows through the porous medium, and reaches the outlet at the other end of the reactor 1, and the outlet pressure of the reactor is set to 1.0 MPa. W...
Embodiment 2
[0053] Example 2: Methane + 80-100 mesh quartz sand system
[0054] In this example, the phase equilibrium conditions for methane to form hydrates in porous media are determined. Experimental device such as figure 1 shown. The narrow tube reactor 1 has an inner diameter of 6 mm and a length of 3 m. The porous medium is quartz sand with a water saturation of 80%, and the filling length of the porous medium is 2.98m. The temperature of constant temperature water bath 2 is set to 1.1°C. Vacuumize the reactor 1, feed methane from the high-pressure gas tank 7, and set the initial pressure to 4.5MPa (reactor outlet pressure), which is much higher than the estimated hydrate formation equilibrium in the pure water system at this temperature Pressure (the literature value of pure water system is 2.92MPa), so that the hydrate can be formed as soon as possible. Adjust the pressure reducing valve 3 and the back pressure valve 4 at the inlet and outlet of the reactor so that the press...
Embodiment 3
[0058] Example 3: (methane + ethane + propane) mixed gas + 80-100 mesh quartz sand system
[0059] In this example, the phase equilibrium conditions for the formation of hydrates by the mixed gas of methane+ethane+propane in porous media are determined. Experimental device such as figure 1 shown. The narrow tube reactor 1 has an inner diameter of 6 mm and a length of 3 m. The porous medium is quartz sand with a water saturation of 80%, and the filling length of the porous medium is 2.98m. The temperature of constant temperature water bath 2 is set to 2.0°C. After vacuumizing the narrow tube reactor 1, feed (91.01mol% methane+7.77mol% ethane+1.22mol% propane) mixed gas from the high-pressure gas tank 7, and set the initial pressure to 3.0MPa (reactor outlet pressure). Adjust the pressure reducing valve 3 and the back pressure valve 4 at the inlet and outlet of the reactor so that the pressure difference between the inlet and outlet of the narrow tube reactor is constant at...
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