scholarly journals Hydrate nucleation and growth on water droplets acoustically-levitated in high-pressure natural gas

2019 ◽  
Vol 21 (39) ◽  
pp. 21685-21688 ◽  
Author(s):  
Kwanghee Jeong ◽  
Peter J. Metaxas ◽  
Joel Chan ◽  
Temiloluwa O. Kuteyi ◽  
Zachary M. Aman ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Nucleation Rate ◽  
Water Droplet ◽  
Hydrate Formation ◽  
Nucleation And Growth ◽  
Acoustic Levitation ◽  
Water Droplets ◽  
Quantitative Measurements ◽  
Formation Probability

We present the first quantitative measurements of hydrate formation probability, nucleation rate and growth on a water droplet suspended within a high pressure natural gas by acoustic levitation.

scholarly journals Gas hydrate formation probability distributions: Induction times, rates of nucleation and growth

Fuel ◽  
2019 ◽  
Vol 252 ◽  
pp. 448-457 ◽  
Author(s):  
Peter J. Metaxas ◽  
Vincent W.S. Lim ◽  
Craig Booth ◽  
John Zhen ◽  
Paul L. Stanwix ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Probability Distributions ◽  
Hydrate Formation ◽  
Nucleation And Growth ◽  
Formation Probability ◽  
Gas Hydrate Formation ◽  
Induction Times

scholarly journals Research on Prediction Methods of Wellbore Hydrate Formation of Ultra-Deep Gas Wells in Northwest Sichuan

2021 ◽  
Vol 329 ◽  
pp. 01076
Author(s):  
Qilin Liu ◽  
Jian Yang ◽  
Lang Du ◽  
Jianxun Jiang ◽  
Dan Ni ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Natural Gas Hydrate ◽  
Gas Wells ◽  
Prediction And Control ◽  
Sulfur Containing ◽  
High Temperature High Pressure

According to the formation and handling situation of hydrate in ultra-deep high-pressure sulfurcontaining gas wells in northwest Sichuan, the formation conditions of natural gas hydrate was studied based on previous studies on hydrate, the molecular dynamics of natural gas hydrate and the multiphase flow law of high-temperature high-pressure high-sulfur-containing gas wellbore were combined, and the pressure prediction model with high-temperature high-pressure sulfur-containing gas wells as the target was built. The chemical and physical control methods of wellbore hydrate plugging were discussed to provide the scientific theoretical basis for the prediction and control of hydrate in high-temperature high-pressure high-sulfurcontaining gas wells.

Natural Gas Hydrate Formation and Decomposition in the Presence of Kinetic Inhibitors. 1. High Pressure Calorimetry

2011 ◽  
Vol 25 (10) ◽  
pp. 4392-4397 ◽  
Author(s):  
Nagu Daraboina ◽  
John Ripmeester ◽  
Virginia K. Walker ◽  
Peter Englezos
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Natural Gas Hydrate ◽  
Gas Hydrate Formation

Offshore Natural Gas Conditioning and Recovery of Methanol as Hydrate Inhibitor with Supersonic Separators: Increasing Energy Efficiency with Lower CO2 Emissions

2019 ◽  
Vol 965 ◽  
pp. 97-105
Author(s):  
Alexandre Mendonça Teixeira ◽  
Lara de Oliveira Arinelli ◽  
José Luiz de Medeiros ◽  
Ofélia de Queiroz Fernandes Araújo
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Power Consumption ◽  
Gas Phase ◽  
Aqueous Phase ◽  
Hydrate Formation ◽  
Dew Point ◽  
External Temperature ◽  
Thermodynamic Conditions ◽  
Commercial Value

The oil and gas industry represents an important contributor to CO2 emissions as offshore platforms are power intensive for producing, processing and transporting hydrocarbons. In offshore rigs CO2 emissions mainly come from on-site gas-fired power generation for heat and electricity production. The accumulation of atmospheric CO2 is one of the main causes of the planetary greenhouse effect, thus CO2 emissions should be minimized. To achieve that, more energy efficient processes for natural gas (NG) conditioning are needed in order to minimize platform power consumption and thus lowering the associated generation of CO2. In addition, in offshore scenarios gas-hydrate obstructions are a major concern in flow assurance strategies, since thermodynamic conditions favoring hydrate formation are present, such as high pressure, low external temperature and gas contact with free water. To avoid hydrate issues, hydrate inhibition is carried out by the injection of a thermodynamic hydrate inhibitor (THI) in well-heads such that it flows along with production fluids, thus removing the thermodynamic conditions for hydrate formation and ensuring unimpeded flow. Therefore, the three-phase high-pressure separator (HPS) is fed with production fluids, where the HPS splits the feed into: (i) an upper gas phase, (ii) hydrocarbon condensate, and (iii) a bottom aqueous phase. The gas phase goes to NG conditioning for hydrocarbon dew point adjustment (HCDPA) and water dew point adjustment (WDPA) so as to make NG exportable. The hydrocarbon condensate (if present) is collected for stabilization and the bottom aqueous phase consisting of water, salts and THI is sent to a THI recovery unit (THI-RU) for THI re-concentration and reinjection. In conventional plants, WDPA and HCDPA are done by glycol absorption and Joule-Thomson expansion respectively. Moreover, the HPS gas carries some THI such as methanol that is lost in the processing. This work analyses a new process – SS-THI-Recovery – where HPS gas feeds a supersonic separator (SS) with injected water and compares it to the conventional processing. As a result, SS ejects a cold two-phase condensate with almost all water, THI and C3+ hydrocarbons, discharging exportable NG with enough HCDPA and WDPA grades, while the condensate gives aqueous THI returned to the THI-RU and LPG with high commercial value. Thus, SS-THI-Recovery not only avoids THI losses as well as exports NG and LPG. Both conventional gas plant and SS-THI-Recovery alternative coupled to THI-RU were simulated in HYSYS 8.8 for a given NG field and targeting the same product specifications. SS-THI-Recovery presented lower power consumption and thus less associated CO2 emissions, while potentially increasing the gas plant profitability, as THI losses are significantly reduced and higher flow rate of LPG with higher commercial value is produced in comparison with the conventional alternative. Hence, the higher efficiency of SS-THI-recovery makes it not only more environmentally friendly with lower CO2 emissions, but also a potential alternative for improving process economics and thus providing an economic leverage that could justify investments in carbon capture technologies, contributing to avoid CO2 emissions even more with cleaner NG and LPG production.

Numerical Calculation and Simulation Research on Natural Gas Downhole Choke Flow Field

2011 ◽  
Vol 71-78 ◽  
pp. 2555-2561 ◽  
Author(s):  
Jia Lin Tian ◽  
Zheng Liang ◽  
Lin Yang ◽  
Lian Cheng Ren ◽  
Xue Qing Mei ◽  
...  
Keyword(s):  
High Pressure ◽  
Numerical Calculation ◽  
Natural Gas ◽  
Flow Field ◽  
Optimization Design ◽  
Three Dimensional ◽  
Hydrate Formation ◽  
Internal Flow ◽  
Working Process ◽  
Gas Hydrate Formation

Natural gas downhole choke process inlet is high temperature and high pressure. Usually it can achieves 10~30MPa, while it will be higher in high pressure drilling well. It is installing thousands of meters underground. It is difficult carrying on field test during working process. These special situations make the choke outlet flow being complex, which includes expansion wave, compression wave, and energy transformation. The physical experiment is difficult. To be more accurately analyzing the compressible viscous turbulent motion of downhole choke internal flow field, this article uses RNG − model for three dimensional numerical simulation. It analyzes the result of flow field streamlines, velocity, Mach number, pressure, and temperature distribution. It analyzes the influence on hydrate formation of choke working process. Numerical calculation can provide useful reference for the prevention of natural gas hydrate formation and optimization design of downhole choke.

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