Gas Hydrates and Flow Assurance

10.1142/p730 ◽  
2022 ◽  
Author(s):  
Bahman Tohidi
Keyword(s):  
2011 ◽  
Vol 50 (1) ◽  
pp. 188-197 ◽  
Author(s):  
Luis E. Zerpa ◽  
Jean-Louis Salager ◽  
Carolyn A. Koh ◽  
E. Dendy Sloan ◽  
Amadeu K. Sum

2021 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
Bazvand M

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.


2015 ◽  
Author(s):  
Govind A. Hegde ◽  
Amadeu K. Sum ◽  
Thomas J. Danielson

RSC Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 3879-3889
Author(s):  
Xiaofang Lv ◽  
Yang Liu ◽  
Shidong Zhou ◽  
Bohui Shi ◽  
Kele Yan

Hydrate slurry decomposition in flow systems is a significant subject that involves flow assurance and development of marine natural gas hydrates.


2021 ◽  
Author(s):  
Jose G. Delgado-Linares ◽  
Ahmad A.A. Majid ◽  
Luis E. Zerpa ◽  
Carolyn A. Koh

Abstract Gas hydrates constitute a serious flow assurance problem. Over the last decades, industry has faced this problem by using avoidance methods (e.g. injection of thermodynamic hydrate inhibitors) and management strategies (e.g. addition of hydrate anti-agglomerants). In the former, hydrates are completely avoided by shifting the hydrate boundary towards higher pressure and lower temperatures; in the latter, hydrates are allowed to form but their tendency to agglomerate is reduced. It should be noted that some crude oils are naturally able to avoid hydrate agglomeration, this non-plugging tendency may originate from the surfactant-like behavior of fractions like asphaltenes and acids. Recent works have shown that the natural non-plugging potential of certain oils can be affected by the addition of polar molecules like alcohols. There is another strategy for managing hydrate that consist of the addition of THIs at a concentration lower that the one required to full hydrate inhibition. In this case, hydrates are under-inhibited. Studies carried out on hydrate agglomerating systems have shown that under-inhibition might prevent hydrate agglomeration only in a specific range of THI concentrations and sub-cooling; however, work on non-plugging oils is scarce. In this paper, the hydrate agglomeration of two crude oils under-inhibited with methanol and MEG was evaluated through a visual rocking cell apparatus and a high-pressure rheometer. Results showed that THIs and the crude oil's natural surfactants were capable of acting synergistically in reducing hydrate agglomeration and improving the system flowability.


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