Interfacial Tension of Methane + Water with Surfactant near the Hydrate Formation Conditions

Sun, Chang‐Yu; Chen, Guangjin; Yang, Liu

doi:10.1021/je049948p

Cited by 100 publications

(97 citation statements)

References 9 publications

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“…The methane gas pressure at in situ is expected to be in the range of several MPa when a depressurization method is applied for gas hydrate production from hydrate deposits. However, the water retention curves were obtained under atmospheric pressure conditions and a temperature of 23-25 • C. When the pressure increases from 1 MPa to 10 MPa, it is reported that the interfacial tension between methane and water decreases from~73 mN/m to~64 mN/m at 298.15 K, varying by~12% [47][48][49]. To date, there is no contact angle measurement data available for the methane-water system on hydrophilic surfaces.…”

Section: Stress-and Strain-dependent Young's Modulusmentioning

confidence: 99%

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

et al. 2016

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This study investigates the geomechanical, hydraulic and thermal characteristics of natural sandy sediments collected during the Ulleung Basin gas hydrate expedition 2, East Sea, offshore Korea. The studied sediment formation is considered as a potential target reservoir for natural gas production. The sediments contained silt, clay and sand fractions of 21%, 1.3% and 77.7%, respectively, as well as diatomaceous minerals with internal pores. The peak friction angle and critical state (or residual state) friction angle under drained conditions were~26 • and~22 • , respectively. There was minimal or no apparent cohesion intercept. Stress-and strain-dependent elastic moduli, such as tangential modulus and secant modulus, were identified. The sediment stiffness increased with increasing confining stress, but degraded with increasing strain regime. Variations in water permeability with water saturation were obtained by fitting experimental matric suction-water saturation data to the Maulem-van Genuchen model. A significant reduction in thermal conductivity (from~1.4-1.6 to~0.5-0.7 W·m −1 ·K −1 ) was observed when water saturation decreased from 100% to~10%-20%. In addition, the electrical resistance increased quasi-linearly with decreasing water saturation. The geomechanical, hydraulic and thermal properties of the hydrate-free sediments reported herein can be used as the baseline when predicting properties and behavior of the sediments containing hydrates, and when the hydrates dissociate during gas production. The variations in thermal and hydraulic properties with changing water and gas saturation can be used to assess gas production rates from hydrate-bearing deposits. In addition, while depressurization of hydrate-bearing sediments inevitably causes deformation of sediments under drained conditions, the obtained strength and stiffness properties and stress-strain responses of the sedimentary formation under drained loading conditions can be effectively used to assess sediment responses to depressurization to ensure safe gas production operations in this potential target reservoir.

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Section: Stress-and Strain-dependent Young's Modulusmentioning

confidence: 99%

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

et al. 2016

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“…The operating temperature was controlled by three Eurotherm temperature controllers with an uncertainty of ±0.1 K. All the pressure gauges were calibrated using a standard RUSKA dead-weight pressure gauge with an uncertainty of ±0.25%. Luo et al 14 and Sun et al 10,15 have used this device to measure the interfacial tension data of C 2 H 4 ＋water system with surfactant, CH 4 ＋water system with surfactant and CO 2 ＋crude oil＋reservoir water system, respectively. Experimental procedures have been described in our previous papers.…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

“…Experimental procedures have been described in our previous papers. 10,14,15 Thus only a brief description is given below.…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

“…Jho et al 9 studied the changes in interface tension between methane and water with pressure at 275.2 K using a capillary rise technique. Sun et al 10 also studied the interfacial tension of methane＋water at 273.2 K using a pendant-drop method. Furthermore, there are some technique papers on modeling the interfacial tension by the theoretical method.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Methane on Water under Hydrate Formation Conditions

et al. 2009

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The variation of interfacial tension with pressure has been determined systemically for water in equilibrium with compressed methane at temperature from 274.2 to 282.2 K in the range of pressure from 0.1 to 10.1 MPa using the pendant-drop method. The results show that the interface tension decreased with increasing pressure when temperature was specified. Pressure has a great influence upon the interface tension at higher pressure. The surface excess concentrations of methane on water at different temperatures and pressures were calculated. The results showed that higher pressure and lower temperature corresponded to higher adsorption concentration of methane. At the same time, the surface adsorption free energies of methane were also calculated, indicating that the adsorption of methane on water under hydrate formation condition is more preferable than that at 298.2 K.

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“…To understand the mechanism of the promoting effect of SDS, Sun et al (2004) hypothesised that, because the nucleation of hydrate is in part an interfacial phenomena, an interfacial property such as interfacial tension of gas and water may have great influence on the hydrate formation rate. It was then suggested that the surfactant reduces the gas-liquid interfacial tension so that gas-liquid mass transfer is improved.…”

Section: Surfactantsmentioning

confidence: 99%

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Farhang¹

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CO 2 capture by trapping the greenhouse gas in clathrates hydrates is proving to be one of the promising options for long term carbon storage. This technology is desirable as it can be deposited in the deep ocean where the suitable pressure and temperature is ready without any extra cost. To date, this method has mostly been of academic interest because the formation of gas hydrates is very slow and requires lots of energy and resources. It is important therefore to develop an efficient and economical process to be able to apply this method at an industrial scale. Scientists and researchers have been looking for suitable additives to accelerate the formation of CO 2 hydrate. To meet these objectives numerous additives have previously been tested and several were found to be suitable hydrate promoters. The mechanism for the formation of gas hydrates in the presence of additives is not clear yet. Understanding this mechanism would help us to select and synthesise the most suitable and cost effective additive.In this thesis, two groups of chemicals i.e. salt and hydrophobic particles were added to the hydrate formation reactor and examined. Initially sodium halides were tested for their effect on the kinetics of the formation of CO 2 hydrates in an isochoric system. The effect of different anion types and concentrations was investigated by directly measuring pressure and temperature changes in the reactor and evaluating maximum CO 2 uptake, conversion, storage capacity, induction time, and hydrate growth rate. The results indicated that sodium halides at a concentration of 50 mM (mmol/L) increase CO 2 consumption and conversion to hydrates. In addition, sodium iodide and sodium bromide in a range of concentrations between 50 and 250 mM significantly increased the hydrate formation kinetics. Measurements of the surface potential of CO 2 hydrates formed in the presence of sodium halides showed negative charge on hydrates with the highest zeta potential observed at the concentration of 50 mM. The findings of this part of the research led us to propose a mechanism for the formation of CO 2 hydrates in the presence of sodium halides.The second group of additives extensively investigated in the current research were hydrophobic nano-particles. Two types of hydrophobic fumed silica were studied.iii They produced two types of particle stabilised systems when mixed with water (i.e. silica foam and dry water). The influence of particle hydrophobicity and concentration on hydrate formation kinetics was established by monitoring gas consumption, CO 2 conversion and induction time. The morphology, microstructure, and pore characteristics were elucidated by cryogenic scanning electron microscopy (cryo-SEM), and the elemental distribution and composition were determined by X-ray energy dispersive spectroscopy (EDS). The results indicated that the promoting effect of hydrophobic fumed silica was dependent on the particle hydrophobicity and on the weight ratio of silica to water. The kinetics of CO 2 hydrate formation were ...

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Interfacial Tension of Methane + Water with Surfactant near the Hydrate Formation Conditions

Cited by 100 publications

References 9 publications

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

Adsorption of Methane on Water under Hydrate Formation Conditions

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

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