Developing a hydrate early detection system

Mazloum, Saeid; Chapoy, Antonin; Yang, Jinhai; Tohidi, Bahman

doi:10.1016/b978-0-444-59496-9.50054-0

Cited by 4 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(5-7) describes the temperature offset of carbon dioxide hydrate phase condition and the temperature of the ice-water equilibrium condition in any THIs solution at constant pressure and below formula [Eq. (8)] can be used to calculate T THI : Table 3 below shows the calculated T f values of aqueous THI solution systems.…”

Section: According Tomentioning

confidence: 99%

Experimental and modeling studies on enhancing the thermodynamic hydrate inhibition performance of monoethylene glycol via synergistic green material

Bharathi

Nashed

Lal

et al. 2021

Sci Rep

View full text Add to dashboard Cite

This paper presents an experimental and modeling studies on the thermodynamic inhibition effects of the mixture of monoethlyene glycol (MEG) and glycine (Gly) on the carbon dioxide hydrate phase boundary condition. The monoethlyene glycol and glycine (1:1) mixture inhibition effects were investigated at concentrations of 5, 10, and 15 wt.% and pressure ranges from 2.0–4.0 MPa. The effects of the proposed mixture on the carbon dioxide hydrate phase boundary were evaluated by measuring the dissociation temperature of carbon dioxide hydrate using a T-cycle method. The synergistic effect was evaluated based on comparison with pure MEG and Gly data. The results show that 15 wt.% of MEG and Gly mixture displays the highest inhibition effect compared to the 5 and 10 wt.% mixtures, respectively. However, the synergistic effect is higher at 10 wt.%. Dickens' model was also adopted to predict the phase equilibrium data of CO2 hydrates in the presence of the mixture. The modified model successfully predicted the data within a maximum error of ± 0.52 K.

show abstract

Section: According Tomentioning

confidence: 99%

Experimental and modeling studies on enhancing the thermodynamic hydrate inhibition performance of monoethylene glycol via synergistic green material

Bharathi

Nashed

Lal

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Therefore, hydrate formation in the sII-dominated system will result in a reduction in the concentration of C 3 and iC 4 in the gas phase. The experiments conducted in this laboratory suggest that conversion of a minimum of 5 barrels of water per million standard cubic feet (mmscf) of gas could cause detectable changes in the gas composition against background compositional variations (i.e., noise) …”

Section: Detecting Early Signs Of Hydrate Formationmentioning

confidence: 99%

“…The experiments conducted in this laboratory suggest that conversion of a minimum of 5 barrels of water per million standard cubic feet (mmscf) of gas could cause detectable changes in the gas composition against background compositional variations (i.e., noise). 13 In general, the pressure and temperature conditions at the wellhead could be outside the hydrate stability zone; however, because of heat loss to the environment and/or Joule− Thompson (JT) effect, the system may enter the hydrate stability zone in subsea transfer lines, whereas the pressure and temperature conditions in the riser could be outside the hydrate stability zone (i.e., resulting in hydrate dissociation). This could result in a condition where there is no obvious sign of hydrate formation in the receiving facilities.…”

Section: ■ Monitoring Hydrate Safety Marginmentioning

confidence: 99%

Do We Have New Solutions to the Old Problem of Gas Hydrates?

et al. 2012

Self Cite

View full text Add to dashboard Cite

Gas hydrates are crystalline compounds formed as a result of the combination of suitable size gas molecules and water under suitable pressure and temperature conditions. They resemble ice but unlike ice can form at temperatures well above the ice formation temperature. Their formation in oil and gas pipelines could result in serious operational problems and safety concerns. The conventional techniques in avoiding gas hydrate problems are dehydration, insulation, and/or heating or injection of thermodynamic or low-dosage hydrate inhibitors. In this paper, we discuss some new techniques for preventing gas hydrate problems that could improve the reliability of hydrate prevention techniques and/or reduce the associated costs. The new solutions include hydrate safety margin monitoring, early hydrate detection systems, and the latest results and techniques for evaluating low-dosage hydrate inhibitors. The application of thermodynamic modeling to CO2-rich systems will also be presented.

show abstract

“…For example, the Centre for Gas Hydrate Research at Heriot-Watt University has proposed new techniques for detecting early signs of hydrate formation in order to give operators sufficient time to take appropriate measures [13]. In the work [14], one of these early warning techniques is presented. This technique is based on a change in the composition of the gas phase caused by hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that due to the formation of hydrates and the corresponding selective capture of natural gas components in hydration cells, the composition of the gas phase changes [15]. Based on the measurement of the sound velocity and thermal conductivity, the device measures equivalent concentration of gas mixture components [14]. Based on this property, an experimental technique has been developed to identify early signs of hydrate crystals formation by determining the gas composition [16].…”

Section: Introductionmentioning

confidence: 99%

Method for determining the starting moment of hydrate formation on the basis of optical effects

et al. 2021

View full text Add to dashboard Cite

The problem is analyzed of hydrate formation in the systems of gathering and treating of oil and gas products. The methods are studied for prevention of complications associated with the gas hydrates accumulation in the pipelines and process lines. Attention is focused on the significant material costs to prevent the hydrate formation and ways to reduce them. The necessity of constant laboratory monitoring for reservoir systems at industrial facilities to determine the hydrate formation parameters has been substantiated. The need to improve the method for determining the hydrate formation parameters for complex reservoir systems based on a mixture of hydrate-forming gases has also been proved. The purpose of the work is to improve the research method of reservoir systems immediately at the facilities of products mining and treatment. The peculiarities are analyzed of the method of visual laboratory observation in the study of gas hydrates. During experimental studies, optical effects of image distortion are observed due to the formation of a gas hydrate layer in the form of a film on the interphase surface. The mechanism of their formation, as well as the processes determining them have been substantiated. Based on this effect, a method of fixing the hydrate formation initial stage (beginning of crystal growth – mass crystallization) is proposed. For increasing the informative ability of the obtained images of hydrate formation processes, it is proposed to “paint” them with the help of colored light sources, as well as to regulate the intensity and direction of illumination. A number of photos are presented, which clearly illustrate the processes described in the paper.

show abstract

Developing a hydrate early detection system

Cited by 4 publications

References 2 publications

Experimental and modeling studies on enhancing the thermodynamic hydrate inhibition performance of monoethylene glycol via synergistic green material

Experimental and modeling studies on enhancing the thermodynamic hydrate inhibition performance of monoethylene glycol via synergistic green material

Do We Have New Solutions to the Old Problem of Gas Hydrates?

Method for determining the starting moment of hydrate formation on the basis of optical effects

Contact Info

Product

Resources

About