Abstract
In this work, a gas hydrate formation and dissociation study was performed on two multiphase pipeline systems containing gasoline, CO2, water, and crude oil, CO2, water, in the pressure range of 2.5–3.5 MPa with fixed water cut as 15% using gas hydrate rocking cell equipment. The system has 10, 15 and 20 wt.% concentrations of gasoline and crude oil, respectively. From the obtained hydrate-liquid-vapor-equilibrium (HLVE) data, the phase diagrams for the system are constructed and analyzed to represent the phase behavior in the multiphase pipelines. Similarly, induction time and rate of gas hydrate formation studies were performed for gasoline, CO2, and water, and crude oil, CO2, water system. From the evaluation of phase behavior based on the HLVE curve, the multiphase system with gasoline exhibits an inhibition in gas hydrates formation, as the HLVE curve shifts towards the lower temperature and higher-pressure region. The multiphase system containing the crude oil system shows a promotion of gas hydrates formation, as the HLVE curve shifted towards the higher temperature and lower pressure. Similarly, the kinetics of hydrate formation of gas hydrates in the gasoline system is slow. At the same time, crude oil has a rapid gas hydrate formation rate.
Highlights
Multiphase flows can be defined as a fluid flow system comprising two or more phases that are distinct, simultaneously co-flowing in a mixture where the level of separation between phases is at a scale well above the molecular level [1]
The list of materials used for the experimental investigation of gas hydrate formation in multiphase pipelines are as follows: (a)
Sinceand gasoline is known for its (GCMS) study is conducted and analyzed to find the composition of the gasoline sample used for high volatility, the high-performance liquid chromatography (HPLC) test is quite challenging to perform
Summary
Multiphase flows can be defined as a fluid flow system comprising two or more phases that are distinct, simultaneously co-flowing in a mixture where the level of separation between phases is at a scale well above the molecular level [1]. Most of them are based on principles such as reaction kinetics, mass transfer, heat transfer, and fluid flow These studies have played a vital role in research on hydrate formation and growth [7]. There are numerous research studies on hydrate formation and flow in gas dominated pipelines, done to investigate the gas hydrates formation in pipelines and deposition process on the pipe wall in the saturated water containing system. Research on gas hydrate formation in multiphase pipelines with gas dominant or oil dominant systems containing black oil or crude oil has later been carries out vividly, to estimate the real-time subsea conditions and kinetics of gas hydrates [17]. + CO2 + water and crude oil + CO2 + water system in the pressure range of 2.5–3.5 MPa, with the fixed water cut or the amount of water taken in the system being 15% of the volume using gas hydrate rocking cell equipment
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