Artificial Fracture Stimulation of Rock Subjected to Large Isotropic Confining Stresses in Saline Environments: Application in Deep-Sea Gas Hydrate Recovery

2018 ◽  
Vol 28 (2) ◽  
pp. 563-583 ◽  
Author(s):  
V. R. S. De Silva ◽  
P. G. Ranjith ◽  
M. S. A. Perera ◽  
B. Wu
Keyword(s):  
Gas Hydrate ◽  
Deep Sea ◽  
Saline Environments ◽  
Artificial Fracture ◽  
Stimulation Of

Speleothems, Travertines, and Paleoclimates

1983 ◽  
Vol 20 (1) ◽  
pp. 1-29 ◽  
Author(s):  
G. J. Hennig ◽  
R. Grün ◽  
K. Brunnacker
Keyword(s):  
Oxygen Isotope ◽  
Deep Sea ◽  
Clear Relationship ◽  
Sufficient Data ◽  
Geographic Position ◽  
Oxygen Isotope Record ◽  
Isotope Record ◽  
Age Range ◽  
Stimulation Of ◽  
Frequency Curves

AbstractAge data for about 660 speleothems and about 140 spring-deposited travertines were collected, including many unpublished results. These data were plotted as histograms and also as error-weighted frequency curves on a 350,000-yr scale. These plots clearly show periods of increased speleothem/travertine growth as well as times of cessation. The periods of most frequent speleothem growth were between approximately 130,000 and 90,000 yr ago and since about 15,000 yr ago. Such periods before 150,000 yr ago, however, cannot be yet recognized because of a lack of sufficient data and the associated uncertainties of dates in this age range. A comparison with the oxygen-isotope record of deep-sea core V28–:238 shows a clear relationship, indicating that terrestrial calcite formation is controlled by paleoclimatic fluctuations. The evident climatic stimulation of Quaternary calcite formation is readily explained geochemically and is substantiated by the obvious difference in speleothem/travertine growth as a function of geographic position.

A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Gas Hydrate and Petroleum Reservoirs

2019 ◽  
Author(s):  
Judith Maria Schicks ◽  
Erik Spangenberg ◽  
Ronny Giese ◽  
Manja Luzi-Helbing ◽  
Mike Priegnitz ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Gas Hydrate ◽  
Petroleum Reservoirs ◽  
Thermal Stimulation ◽  
Counter Current ◽  
Stimulation Of ◽  
Current Heat

The Evolution of Gas Hydrate Accumulations in Zones of Deep-Sea Mud Volcanoes

2019 ◽  
Vol 13 (2) ◽  
pp. 107-111
Author(s):  
A. L. Sobisevich ◽  
E. I. Suetnova ◽  
R. A. Zhostkov
Keyword(s):  
Gas Hydrate ◽  
Deep Sea ◽  
Mud Volcanoes ◽  
Sea Mud

scholarly journals Gas Seeps at the Edge of the Gas Hydrate Stability Zone on Brazil’s Continental Margin

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 193 ◽  
Author(s):  
Marcelo Ketzer ◽  
Daniel Praeg ◽  
Maria A.G. Pivel ◽  
Adolpho H. Augustin ◽  
Luiz F. Rodrigues ◽  
...  
Keyword(s):  
Gravitational Collapse ◽  
Continental Margin ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Rio Grande ◽  
Cold Seep ◽  
Stability Zone ◽  
The Stability ◽  
Sea Fan ◽  
Hydrate Stability

Gas hydrate provinces occur in two sedimentary basins along Brazil’s continental margin: (1) The Rio Grande Cone in the southeast, and (2) the Amazon deep-sea fan in the equatorial region. The occurrence of gas hydrates in these depocenters was first detected geophysically and has recently been proven by seafloor sampling of gas vents, detected as water column acoustic anomalies rising from seafloor depressions (pockmarks) and/or mounds, many associated with seafloor faults formed by the gravitational collapse of both depocenters. The gas vents include typical features of cold seep systems, including shallow sulphate reduction depths (<4 m), authigenic carbonate pavements, and chemosynthetic ecosystems. In both areas, gas sampled in hydrate and in sediments is dominantly formed by biogenic methane. Calculation of the methane hydrate stability zone for water temperatures in the two areas shows that gas vents occur along its feather edge (water depths between 510 and 760 m in the Rio Grande Cone and between 500 and 670 m in the Amazon deep-sea fan), but also in deeper waters within the stability zone. Gas venting along the feather edge of the stability zone could reflect gas hydrate dissociation and release to the oceans, as inferred on other continental margins, or upward fluid flow through the stability zone facilitated by tectonic structures recording the gravitational collapse of both depocenters. The potential quantity of venting gas on the Brazilian margin under different scenarios of natural or anthropogenic change requires further investigation. The studied areas provide natural laboratories where these critical processes can be analyzed and quantified.

scholarly journals Formation of submarine gas hydrates

1994 ◽  
Vol 41 ◽  
pp. 86-94
Author(s):  
V. Soloviev ◽  
G. D. Ginsburg
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Hydrate Formation ◽  
Coarse Grained ◽  
Necessary Condition ◽  
Dissolved Gas ◽  
Scale Levels ◽  
Bottom Sampling ◽  
Gas Bearing

Submarine gas hydrates have been discovered in the course of deep-sea drilling (DSDP and ODP) and bottom sampling in many offshore regions. This paper reports on expeditions carried out in the Black, Caspian and Okhotsk Seas. Gas hydrate accumulations were discovered and investigated in all these areas. The data and an analysis of the results of the deep-sea drilling programme suggest that the infiltration of gas-bearing fluids is a necessary condition for gas hydrate accumulation. This is confirmed by geological observations at three scale levels. Firstly, hydrates in cores are usually associated with comparatively coarse-grained, permeable sediments as well as voids and fractures. Secondly, hydrate accumulations are controlled by permeable geological structures, i.e. faults, diapirs, mud volcanos as well as layered sequences. Thirdly, in the worldwide scale, hydrate accumulations are characteristic of continental slopes and rises and intra-continental seas where submarine seepages also are widespread. Both biogenic and cat­agenic gas may occur, and the gas sources may be located at various distances from the accumulation. Gas hydrates presumably originate from water-dissolved gas. The possibility of a transition from dissolved gas into hydrate is confirmed by experimental data. Shallow gas hydrate accumulations associated with gas-bearing fluid plumes are the most convenient features for the study of submarine hydrate formation in general. These accumulations are known from the Black, Caspian and Okhotsk Seas, the Gulf of Mexico and off northern California.

scholarly journals A New Inhibitor to Prevent Hydrate Formation

2021 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
Bazvand M
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Hydrate Formation ◽  
Cost Effective ◽  
Vinyl Pyrrolidone ◽  
Flow Assurance ◽  
Main Structure ◽  
Poly Vinyl Pyrrolidone ◽  
Prevention Methods

Due to the growing demand for energy as well as the depletion of shallow land reservoirs, it sounds more important to utilize deep sea reservoirs. Due to their special conditions, drilling and production of these reservoirs face more problems. The science that helps us avoiding problems during operation is called flow assurance. One of the important issues in flow assurance is to prevent formation of gas hydrates. One of gas hydrates preventing methods is to use of inhibitors. Using of inhibitors is a cost- effective and eco-friendly method; so, it is used more nowadays. This paper introduces a new hydrate inhibitor that has been developed from the modification of one of the most widely used inhibitors present in the industry, Poly Vinyl Pyrrolidone, to improve its efficiency. The main structure of the paper is about what is the gas hydrate and its prevention methods. Finally, compare different inhibitors with new one. The results show that hydrate formation time for all polymers is approximately the same, while a half of new inhibitor in compare with amount of others inhibitors causes the same results. This matter shows a double efficiency, and this means a saving of double Polymer consumption.

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