- Tytuł:
-
Badania środków poprawiających stabilność sedymentacyjną zaczynów cementowych
Tests on agents improving the sedimentation stability of cement slurries - Autorzy:
- Kremieniewski, Marcin
- Powiązania:
- https://bibliotekanauki.pl/articles/1834049.pdf
- Data publikacji:
- 2020
- Wydawca:
- Instytut Nafty i Gazu - Państwowy Instytut Badawczy
- Tematy:
-
zaczyn cementowy lekki
stabilność sedymentacyjna
frakcjonowanie
środki przeciwsedymentacyjne
lightweight cement slurry
sedimentation stability
fractionation
anti-sedimentation agents - Opis:
- When designing slurries with reduced density, one of the biggest difficulties is obtaining a homogeneous slurry structure both in liquid state and after setting. This problem is mainly due to the presence of light fillers in the slurry volume. Due to fractionation, these materials float in the upper parts of the cemented annular space. In turn, cement grains, which are characterized by higher density, as a result of sedimentation settle in the bottom of the hole. This cement slurry behavior is unfavorable. The cement sheath resulting from such heterogeneous cement slurry will show very low values of compressive strength in the upper parts of the sealed column of pipes, yielding poor stabilization. In addition, the cement sheath will have high permeability, which results in the lack of sealing efficiency of individual pipe sections. In order to eliminate this undesirable phenomenon of excessive fractionation and sedimentation of lightweight cement slurry, various agents are used to improve sedimentation stability. Agents of this type are tested in cement slurry. However, a much more accurate measurement of the possibility of counteracting the fractionation of a given anti-sedimentation agent is testing it in water. This is due to the fact that the presence of additional additives and admixtures in the cement slurry results in its higher plastic viscosity. Therefore, this publication presents the results of research on agents that improve sedimentation stability by determining their impact on the microsphere in a low-viscous liquid, which is water. The article presents the methodology for measuring light filler fractionation and anti-sedimentation effect of selected agents improving the sedimentation stability of cement slurries. During the implementation of research, the focus was mainly on determining the fractionation of microspheres in mixing water with a specific concentration of agents that improve sedimentation stability. Six types of agents were selected for research, which were used in concentrations from 0.5% to 10%. Microsphere fractionation tests were performed per unit of time, based on which it was possible to determine the effectiveness of a given fractionation limiting agent in order to prepare a lightweight cement slurry with appropriate sedimentation stability.
- Źródło:
-
Nafta-Gaz; 2020, 76, 6; 387--395
0867-8871 - Pojawia się w:
- Nafta-Gaz
- Dostawca treści:
- Biblioteka Nauki
Artykuł