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Figure 6. Engineering image of offshore natural <strong>gas</strong> <strong>hydrate</strong> development.<br />
ONE-DIMENSIONAL EXPERIMENTAL FACILITY FOR HYDRATE PRODUCTION<br />
SIMULATION<br />
Experimental apparatus and media<br />
The one dimensional experimental facility was constructed in order to simulate the different<br />
kind of development methods for natural <strong>gas</strong> <strong>hydrate</strong>s as shown in Figure 7. The pressure<br />
vessel as the main unit of the setup is immersed in an air bath with the temperature varying<br />
from -20 to 80 °C. The cell is made of stainless steel and has an internal diameter of 38 mm<br />
and a length of 500 mm; it can be operated up to 25 MPa. Four resistance thermometers and<br />
two pressure transducers with three differential pressure transducers were placed in four ports<br />
evenly along the vessel, as plotted in Figure 8, to measure the temperature and pressure<br />
profile along the vessel. To simulate the hot water or chemical inhibitor injection production<br />
model, a middle container with an electrical resister has been used, which can prevent damage<br />
to the pump due to high temperatures or corrosive chemicals. The data acquisition unit<br />
records all the information varying with time, which includes pressure or pressure difference,<br />
temperature, <strong>gas</strong>/water injection rate, and <strong>gas</strong>/water production rate.<br />
70<br />
New Energy Resources in the <strong>CCOP</strong> Region - Gas Hydrates and Coalbed Methane
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