dc.contributor.author | Molnes, Silje | |
dc.contributor.author | Paso, Kristofer Gunnar | |
dc.contributor.author | Strand, Skule | |
dc.contributor.author | Syverud, Kristin | |
dc.date.accessioned | 2017-08-17T07:34:42Z | |
dc.date.available | 2017-08-17T07:34:42Z | |
dc.date.created | 2017-08-16T09:27:16Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 0969-0239 | |
dc.identifier.uri | http://hdl.handle.net/11250/2450968 | |
dc.description.abstract | Cellulose nanocrystals (CNC) are currently being investigated as potential additives for enhanced oil recovery (EOR). Presented in this paper is a study investigating the effects of different physical and chemical environments that low concentration CNC dispersions may be subjected to at oil reservoir conditions. Different concentrations of CNC dispersed in de-ionized water and in a 1000 ppm NaCl brine were subjected to variations in pH and temperature, and the results showed that the dispersions remained stable in the pH range expected in oil reservoirs (between 5 and 9). Stable dispersions were also observed when heated to temperatures ranging from 50 to 90 °C. At extended heat aging at 90 and 120 °C for seven days; beginning degradation was observed for both types of CNC dispersions; with viscosity increase and pH decrease as the most important indicators. CNC dispersed in 1000 ppm NaCl brine was generally more heat tolerant than the CNC dispersed in de-ionized water. The increase in viscosity during heat aging can be very interesting for EOR applications. A fluid that increases its viscosity with heat and time will be easier to inject due to a low initial viscosity, and when the viscosity increases in the porous reservoir, the effect can be a stable waterfront and less viscous fingering, which again can lead to increased sweep efficiency and better oil recovery. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Springer Verlag | nb_NO |
dc.title | The effects of pH, time and temperature on the stability and viscosity of cellulose nanocrystal (CNC) dispersions: implications for use in enhanced oil recovery | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | acceptedVersion | nb_NO |
dc.source.journal | Cellulose (London) | nb_NO |
dc.identifier.doi | 10.1007/s10570-017-1437-0 | |
dc.identifier.cristin | 1486518 | |
dc.description.localcode | This is the authors' accepted and refereed manuscript to the article. Locked until 14 August 2018 due to copyright restrictions. The final publication is available at Springer via https://link.springer.com/article/10.1007%2Fs10570-017-1437-0 | nb_NO |
cristin.unitcode | 194,66,30,0 | |
cristin.unitname | Institutt for kjemisk prosessteknologi | |
cristin.ispublished | false | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |