In situ monitoring of extraction and separation behavior of lipids with supercritical carbon dioxide

1992 ◽  
Vol 31 (2) ◽  
pp. 568-574 ◽  
Author(s):  
Yutaka Ikushima ◽  
Norio Saito ◽  
Kiyotaka Hatakeda ◽  
Shota Ito ◽  
Masahiko Arai ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
In Situ Monitoring ◽  
Extraction And Separation ◽  
Separation Behavior ◽  
Supercritical Carbon

Real-Time Monitoring of the Effect of CO2 on the Cement Sheath

2021 ◽  
Author(s):  
Paul Wagner ◽  
Kris Ravi ◽  
Michael Prohaska
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Portland Cement ◽  
Carbon Dioxide Sequestration ◽  
In Situ Monitoring ◽  
In Situ Conditions ◽  
Cement Sheath ◽  
Cement Integrity ◽  
Supercritical Carbon

Abstract Global warming is one of the most significant issues the world is facing. Capturing carbon dioxide from the atmosphere or industrial processes and storing it in geological formations (carbon capture and storage, CCS) can help counteract climate change. Nevertheless, the interaction between well barrier elements such as cement, casing, tubulars, packers, and valves can lead to possible leakages. To accomplish successful carbon dioxide sequestration, injecting the carbon dioxide in its supercritical state is necessary. The supercritical carbon dioxide can corrode steel and elastomers and react with the calcium compounds in the cement, dissolving them and forming calcium carbonate and bicarbonate in the process. This carbonation can lead to channels forming on the cement-to-rock interface or cracking due to the carbonate precipitation, resulting in a loss of well integrity. This study focusses on finding ways that enable the continuous monitoring of cement integrity, under in-situ conditions, in a lab setup. The construction of an autoclave, capable of withstanding supercritical conditions of carbon dioxide, facilitates the in-situ monitoring. This autoclave also makes CT-scans of the pressurized sample possible, as well as acoustic measurements, using state-of-the-art piezo elements. The first tests will establish a baseline using neat Class G Portland cement to verify the design and sensors. The set up consists of a rock core in the middle of the autoclave surrounded by a cement sheath. A prepared channel in the center of the core expedites the distribution of the carbon dioxide. Once the ability of the sensors to monitor the integrity is verified, different cement compositions and their interaction with supercritical carbon dioxide can be studied. The experimental setup and the procedure discussed here closely simulate the downhole condition. Hence, the results obtained using this setup and procedure is representative of what could be observed downhole. The direction is not to remove the sample from the autoclave for analysis, as is the current industry practice, but to measure cement integrity under in-situ conditions over an extended period of time. Digitalization is powering the in-situ analysis in these tests. The first two tests of this study, using the afore mentioned autoclave, investigated the carbonation behaviour of two Class G Portland cement slurrys, one with a low and one with a high slurry-density. The low-density slurry showed extensive degradation and even the high-density slurry showed carbonation, but only close to the sandstone core. The results from this study can lead to the prevention of leakage of carbon dioxide to the environment and other formations, which defeats the purpose of carbon dioxide sequestration. These results should improve the economics of these wells as well as the health, safety, and environmental aspects.

PS-HQ: More convenient in situ polymeric cocatalyst for the PdCl2-catalyzed acetalization in supercritical carbon dioxide

2007 ◽  
Vol 18 (8) ◽  
pp. 969-972
Author(s):  
Zhao Yang Wang ◽  
Huan Feng Jiang ◽  
Chao Rong Qi ◽  
Yan Xia Shen ◽  
Shao Rong Yang
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon

Nanoparticle catalysed oxidation of sulfides to sulfones by in situ generated H2O2 in supercritical carbon dioxide/water biphasic medium

2010 ◽  
Vol 46 (36) ◽  
pp. 6705 ◽  
Author(s):  
Sanjib Kumar Karmee ◽  
Lasse Greiner ◽  
Alexander Kraynov ◽  
Thomas E. Müller ◽  
Bernd Niemeijer ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Oxidation Of Sulfides ◽  
Catalysed Oxidation ◽  
Biphasic Medium ◽  
Supercritical Carbon

Body temperature polymerization and in situ drug encapsulation in supercritical carbon dioxide

2020 ◽  
Vol 11 (42) ◽  
pp. 6821-6831
Author(s):  
Zi-Kun Rao ◽  
Tian-Qiang Wang ◽  
Yang Li ◽  
Hong-Yu Zhu ◽  
Yu Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Body Temperature ◽  
Supercritical Carbon Dioxide ◽  
Solvent Free ◽  
Drug Encapsulation ◽  
First Time ◽  
Supercritical Carbon

Body-temperature and solvent-free polymerization and in situ fabrication of drug-loaded microparticles are reported for the first time.

Synthesis of polylactide/clay nanocomposites by in situ intercalative polymerization in supercritical carbon dioxide

2009 ◽  
Vol 45 (3) ◽  
pp. 643-648 ◽  
Author(s):  
Laetitia Urbanczyk ◽  
Fred Ngoundjo ◽  
Michael Alexandre ◽  
Christine Jérôme ◽  
Christophe Detrembleur ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Clay Nanocomposites ◽  
Intercalative Polymerization ◽  
Supercritical Carbon
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