Reduction of Fractionation of Lightweight Slurry to Geothermal Boreholes
Open Access
- 21 June 2021
- Vol. 14 (12), 3686
- https://doi.org/10.3390/en14123686
Abstract
When designing the cement slurry for casing string cementing in geothermal boreholes, the appropriate thermal conductivity is selected. In the zone of geothermal water, where thermal energy is collected, cement slurry is used, from which the cement sheath has high thermal conductivity. On the other hand, the remaining part of the opening is sealed with slurry, from which the cement sheath will reduce thermal energy losses through appropriate thermal insulation. Cement slurry with appropriate thermal insulation includes light insulating materials. However, the use of such additives is very problematic as they are fractionated due to their low density. Therefore, measures should be taken to prevent fractionation of the cement slurry for sealing geothermal boreholes. This article presents the results of research on fractionation of cement slurries for sealing geothermal boreholes. 12 slurries were used for the tests. Six of them are based on class A cement, and six based on class G cement. This action shows the differences in fractionation depending on the binder used. However, the main area of research is determining the effectiveness of counteracting fractionation by the means used for this purpose. As a result of the conducted works, a very good improvement of the cement slurry stability is obtained after the introduction of xanthan gum, as well as filtration perlite. These measures prevent fractionation, so that the cement slurry has a homogeneous structure, and the cement sheath provides the required thermal insulation in the geothermal well.Funding Information
- Ministry of Science and Higher Education Warsaw ((Internal order Oil and Gas Institute—National Research Institute Project No. 0015/KW/21 and 36/KW/16))
This publication has 36 references indexed in Scilit:
- Sensitivity analysis of deep geothermal reservoir: Effect of reservoir parameters on production temperatureEnergy, 2017
- Poprawa stabilności sedymentacyjnej zaczynu cementowegoNafta-Gaz, 2017
- The Podhale geothermal reservoir simulation for long-term sustainable productionRenewable Energy, 2016
- Economic aspects of the use of deep geothermal heat in district heating in PolandRenewable and Sustainable Energy Reviews, 2015
- Atlases of geothermal waters and energy resources in PolandEnvironmental Earth Sciences, 2014
- Experimental Investigation on Pore Structure Characterization of Concrete Exposed to Water and ChloridesMaterials, 2014
- Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk PolymerizationMaterials, 2014
- The influence of time of rheological parameters of fresh cement slurriesAGH Drilling, Oil, Gas, 2014
- On the properties of freshly made Portland cement paste. Part 2. sedimentation and strength of flocculationCement and Concrete Research, 1988
- Sedimentation behaviour in cement pastes subjected to continuous shear in rotational viscometersCement and Concrete Research, 1982