Effect of geological layers on hydrate dissociation in natural gas hydrate reservoirs

Bhade, Piyush; Phirani, Jyoti

doi:10.1016/j.jngse.2015.05.016

Cited by 45 publications

(17 citation statements)

References 37 publications

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“…In the nature, the gas and water flow characteristics in hydrate reservoirs are affected by the permeability . The permeability also has an effect on the recovery efficiency of gas hydrate‐bearing areas .…”

Section: Analyzing the Basic Physical Properties Of Hydrate Sedimentsmentioning

confidence: 99%

“…In the nature, the gas and water flow characteristics in hydrate reservoirs are affected by the permeability. [83,141,142] The permeability also has an effect on the recovery efficiency of gas hydratebearing areas. [143][144][145][146] Therefore, a large number of experiments on the measurement of the permeability of the sediments and its influencing factors had been studied by scientists at home and abroad.…”

Section: Measuring the Permeability Of Hydrate Sedimentmentioning

confidence: 99%

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Application of X‐Ray Computed Tomography Technology in Gas Hydrate

Zheng

Tang

et al. 2019

Energy Tech

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Clathrate hydrates are formed by water molecules and natural gas molecules under a certain temperature and pressure. Natural gas hydrates are mainly distributed in the marine sediments and the permafrost in nature. As a kind of potential clean energy, determining the structural characteristics of hydrates in sediments is the prerequisite for the safe and economic exploitation of natural gas hydrate. X‐ray computed tomography (CT) is a potential method to nondestructively detect the occurrence of natural gas hydrate. The basic physical properties such as porosity, hydrate saturation, and sediment permeability of the hydrate‐bearing sediments are analyzed by calculating the CT numbers or combining with the network model. Therefore, the X‐ray CT is used to study the hydrates produced in the laboratory and the hydrates formed in the nature by scientists all over the world. By summarizing the previous research, this article focuses on the important role of X‐ray CT in the hydrate research from the following three aspects: analyzing the basic physical properties of hydrate sediment, identifying the occurrence mode of hydrate in sediments, and measuring the hydrate formation and decomposition process. In response to the research progress and future research directions, relevant suggestions had been put forward.

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Section: Analyzing the Basic Physical Properties Of Hydrate Sedimentsmentioning

confidence: 99%

Section: Measuring the Permeability Of Hydrate Sedimentmentioning

confidence: 99%

Application of X‐Ray Computed Tomography Technology in Gas Hydrate

Zheng

Tang

et al. 2019

Energy Tech

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“…Scientists from the USA, Canada, Japan, Australia, Norway, India are working in this direction. The proposed technological solutions for extraction of methane gas from gas hydrate deposits described in [26][27][28] are of a theoretical nature. Industrial development of gas hydrates needs further experimental research.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Effect of mechanoactivated chemical additives on the process of gas hydrate formation

Bondarenko

Svietkina

Sai

2018

EEJET

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Досліджено вплив механохімічно активованих домішок на процес утворення газових гідратів метану. Встановлено, що процес утворення газогідратів метану у присутності активованих алюмосилікатів відбувається не по автокаталітичному характеру. Виявлено, що у складі газового гідрату метану з'являється етан. Визначено константи швидкості утворення газогідратів метану при Т=274 K і тиску 5 МПа у присутності механоактивованих домішок Ключові слова: газогідрати метану, механоактивація, гетерогенний каталіз, швидкість гідратоутворення, дисоціація, алюмосилікати, фазові перетворення Исследовано влияние механохимически активированных добавок на процесс образования газовых гидратов метана. Установлено, что процесс образования газогидратов метана в присутствии активированных алюмосиликатов происходит не по автокаталитическому характеру. Обнаружено, что в составе газового гидрата метана появляется этан. Определены константы скорости образования газогидрата метана при Т=274 K и давлении 5 МПа в присутствии механоактивированных добавок Ключевые слова: газогидраты метана, механоактивация, гетерогенный катализ, скорость гидратообразования, диссоциация, алюмосиликаты, фазовые превращения

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“…Both the rate of hydrate formation and dissociation can be affected by many factors, including gas composition/cage occupancy, , mass transfer limits, presence of liquid hydrocarbons, , presence of surfactants, , and length scales (pore scale or large scale). − Metastable hydrate can also exist at some conditions, for example, supercooled water below the freezing point may retard and slow down the dissociation of methane hydrate, i.e., it can exist as a metastable phase . Some kinetic hydrate inhibitors, e.g., poly- n -vinylcaprolactam (PVCap), also affect gas hydrate dissociation kinetics and metastable thermodynamic stability. − Hence, significant literature experimental and numerical modeling work has been undertaken with respect to the accurate measurement of gas hydrate phase behavior for different systems/conditions. ,− …”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of Multiple Hydrate Structure Formation in Binary and Ternary Natural Gas Analogue Systems by Isochoric Equilibrium Methods

2021

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Traditionally, it is commonly assumed that a single gas hydrate (or clathrate hydrate) structure/phase is formed in natural gas systemse.g., "s-II natural gas (NG) hydrates" or "s-I methane hydrates"based on that which is understood to be the most thermodynamically stable at incipient phase boundary conditions. This applies with respect to both studies of hydrates in natural sediments, and in the case of hydrocarbon production operations, including the testing of low-dosage hydrate inhibitors (LDHIs). Here, we present the results of experimental studies of simple propane (C 3 ), binary methane−propane (C 1 −C 3 ), and ternary methane−ethane−propane (C 1 −C 2 −C 3 ) hydrate systems, aimed at investigating phase behavior at higher subcoolings where significant water conversions to clathratesand associated gas fractionationmight be expected to result in the formation of more than one hydrate structure. Measurements were made by means of established, reliable, isochoric equilibrium step-heating/cooling approaches. In the single guest propane system, pressure−temperature (PT) conditions follow the gas hydrate phase boundary, in agreement with the univariant hydrate + gas + water (H + G + W) equilibrium. By contrast, binary and ternary mixes clearly show PT behavior consistent with the growth of at least two and four hydrate phases, respectively, with these forming sequentially on cooling, and dissociating in the corresponding reverse order upon heating. In-house hydrate model (HydraFLASH) predictions support experimental observations, pointing to processes being gas fractionation driven; the mixed C 3 −C 1 or C 3 −C 2 −C 1 s-II type hydrates formed first close to the phase boundary preferentially incorporating the most strongly clathrate cage (5 12 6 4 ) stabilizing propane, making the remaining gas leaner. Once C 3 is largely consumed, trends agree with less stable C 2 −C 1 structures (s-II followed by s-I) then growing (where ethane is present), with this, like C 3 uptake, making remaining free gas increasingly of almost pure C 1 . This ultimately drives systems toward the final simple, single guest C 1 s-I clathrate formation as the well-established univariant phase boundary for this structure is reached. As observed phase behavior arises because of gas fractionation, it can be expected to occur during hydrate formation in all mixed gas systems of relatively fixed composition (at constant volume or pressure). The findings highlight that care should be taken in the application of isochoric methods to multicomponent gas systems, given the potential for numerous (rather than just one) clear changes in heating curve slopes as different hydrate structures form/dissociate. In addition, results show that extending equilibrium steps well into the hydrate region can reveal important information on clathrate phase behavior with potentially significant implications for issues such as gas production from hydrates in sediments, hydrate technologies for gas capture/separation/storage in the energy industry, and flow assuranc...

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Effect of geological layers on hydrate dissociation in natural gas hydrate reservoirs

Cited by 45 publications

References 37 publications

Application of X‐Ray Computed Tomography Technology in Gas Hydrate

Application of X‐Ray Computed Tomography Technology in Gas Hydrate

Effect of mechanoactivated chemical additives on the process of gas hydrate formation

Experimental Measurement of Multiple Hydrate Structure Formation in Binary and Ternary Natural Gas Analogue Systems by Isochoric Equilibrium Methods

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