A near-infrared carbon dioxide sensor system using a compact folded optical structure for deep-sea natural gas hydrate exploration

2018 ◽  
Vol 10 (39) ◽  
pp. 4838-4844 ◽  
Author(s):  
Zhiwei Liu ◽  
Chuantao Zheng ◽  
Chen Chen ◽  
Hongtao Xie ◽  
Qiang Ren ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Near Infrared ◽  
Sensor System ◽  
Natural Gas Hydrate ◽  
Carbon Dioxide Sensor ◽  
Optical Structure

A near-infrared carbon dioxide sensor system using a compact folded optical structure for deep-sea natural gas hydrate exploration.

scholarly journals ICL-based mid-infrared carbon dioxide sensor system for deep-sea natural gas hydrate exploration

2019 ◽  
Vol 27 (4) ◽  
pp. 5598 ◽  
Author(s):  
Zhiwei Liu ◽  
Chuantao Zheng ◽  
Chen Chen ◽  
Yafei Li ◽  
Hongtao Xie ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Sensor System ◽  
Natural Gas Hydrate ◽  
Mid Infrared ◽  
Carbon Dioxide Sensor

scholarly journals Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Minghui Wei ◽  
Chenghuai Wu ◽  
Yanxi Zhou
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Injection Pressure ◽  
High Polymer ◽  
Polymer Additive ◽  
Natural Gas Hydrate ◽  
Hydrate Decomposition ◽  
Wellbore Temperature ◽  
Temperature And Pressure

In order to solve the problem of hydrate reservoir collapse and hydrate regenerated in the process of solid fluidization of natural gas hydrate, a new method of natural gas hydrate exploit by high‐polymer additive (low viscosity carboxymethyl cellulose LV‐CMC) carbon dioxide jet was proposed. The wellbore temperature and pressure changes during this process are analyzed, and the wellbore temperature and pressure model are established and solved by the state space method. This paper also analyzed the effects of relevant parameters on hydrate decomposition, such as injection flow, temperature, and pressure. The results show that increasing the injection pressure allows the hydrate decomposition site to be closer to the annulus outlet. Compared with water, with polymer additive CO2 fluid as the drilling fluid, the intersection point of phase equilibrium curve and annular pressure curve is closer to annular outlet, which is obviously more conducive to well control. In order to avoid phase changes, the injection pressure of the carbon dioxide fluid of the high‐polymer additive should not be lower than 10 MPa, and the injection temperature should not be higher than 285 K.

scholarly journals Injection of CO2/N2 gaseous mixtures into gas hydrates to contemporary perform CH4 recovery and CO2 storage

2021 ◽  
Vol 312 ◽  
pp. 08009
Author(s):  
Mirko Filipponi ◽  
Alberto Maria Gambelli ◽  
Yan Li ◽  
Andrea Presciutti ◽  
Beatrice Castellani ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Co2 Storage ◽  
Gaseous Mixture ◽  
Small Scale ◽  
Carbon Dioxide Injection ◽  
Natural Gas Hydrate ◽  
Gaseous Mixtures ◽  
Experimental Apparatus

Carbon dioxide injection into natural gas hydrate reservoirs represents a promising opportunity to predispose a theoretically carbon neutral energy source. This technique allows to replace methane molecules with an equal number of carbon dioxide molecules and, consequently, to balance in advance emissions associated to methane utilization. While the direct CH4/CO2 replacement has been widely investigated, more data and scientific evidences are required to well define the feasibility of recovering methane by replacing it with CO2-based gaseous mixtures. In this sense, the most promising opportunity consists in flue-gas mixtures. In some cases, the presence of nitrogen was found capable to improve the overall efficiency, due to the direct competition between CH4 and N2 molecules to fill small cages characterizing hydrate structures. Moreover, these mixtures are extremely less-expensive than pure carbon dioxide. In this work, a binary CO2/N2 (50/50 vol%) gaseous mixture was used to recover methane contained into hydrate structures. Experiments were carried out in a small-scale experimental apparatus, designed to simulate a natural gas hydrate reservoir and to intervene on it with replacement techniques. Composition of gaseous mixtures present into hydrates and in the gaseous phase present immediately above, where defined via gas-chromatographic analyses. Finally, results were compared with data currently present in literature, in order to validate their consistency.

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