Abstract:
Objective During the exploitation process of high-sulfur gas reservoirs, natural gas hydrates are easily formed in the wellbore and pipeline, causing ice blockage and affecting normal production.
Methods Under the conditions of constant temperature and volume, the effects of the mineralization ions on the growth rate of high-sulfur gas hydrates are experimentally studied in an Hastelloy reactor. The effects of pressure, mineral ions of gas field water and solution morphology on the growth process morphology, growth characteristics and extension pattern of high-sulfur gas hydrate at the gas-liquid interface were also studied by direct top-view observation.
Results It is shown that the salts can decrease the growth rate of hydrates and change the morphology of the hydrate crystal. At the gas-liquid interface, the hydrate grows from the nucleation point in a two-dimensional expansion pattern. When elevating the pressure, it has little effects on the morphology of hydrate crystal, but it can increase the growth rate of hydrate.
Conclusions The analysis shows that ionization effects of the salts decrease the activities of water and affect the growth process of hydrate. The experimental results of this work have great significance for hydrate prevention and the normal exploitation of high-sulfur gas reservoir.
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