- Tytuł:
-
Możliwości zastosowania nanotlenku glinu w zaczynach cementowych przeznaczonych do uszczelniania rur okładzinowych w otworach wiertniczych
The possibility of using of nano aluminum oxide in cement slurries for sealing casing in boreholes - Autorzy:
-
Rzepka, Marcin
Kędzierski, Miłosz - Powiązania:
- https://bibliotekanauki.pl/articles/1834133.pdf
- Data publikacji:
- 2020
- Wydawca:
- Instytut Nafty i Gazu - Państwowy Instytut Badawczy
- Tematy:
-
nanotlenek glinu
nano-Al2O3
zaczyn cementowy
kamień cementowy
wiązanie zaczynu
wytrzymałość mechaniczna
nano aluminum oxide
cement slurry
cement sheath
cement setting
mechanical strength - Opis:
- The article presents compositions and test results for cement slurries formulations containing from 1% to 5% of nano aluminum oxide (n-Al2O3) for sealing the casing columns in boreholes with dynamic temperatures of about 30°C and 60°C. Laboratory tests of cement slurries were carried out at Oil and Gas Institute - National Research Institute. The densities of tested slurries ranged from 1,820 to 1,920 kg/m3 , and were prepared on the basis of Portland cement CEM I 42,5 and class G oil well cement. Cement slurries had thickening times properly matched to given geological and technical conditions. For slurries tested at lower temperatures, particular attention was paid to the gelling and setting process of cement slurries. These parameters play a key role in limiting possible gas migrations from shallow gas accumulations. They were selected so that the gelling and setting process could be carried out in a sufficiently short time. At higher temperatures, the focus was on developing cement slurry formulations with increased mechanical strength and a tight and compact microstructure. Cement slurry formulations with very good technological parameters were developed, which after curing (after 28 days of hydration) had very high values of compressive strength, reaching up to 40 MPa. Such high compressive strength values are extremely difficult to obtain with conventional cement slurries. Scanning electron microscope images of cement samples also confirm extremely compact microstructure of the samples with nano-SiO2. In addition to the photographs of base cement stones, which show pores, microscopic images of samples with the addition of 3% n-Al2O3 are presented, where we observe a compact cement matrix with very low permeability. Furthermore, samples containing n-Al2O3 were characterized by a very low content of capillary pores. Pores of the smallest size (below 100 nm) constituted the vast majority of the total number of pores. Improvement of cement matrix tightness by reducing the amount of pores that can transport the reservoir medium to approx. 1.5% means that cement slurry formulas containing nano aluminum oxide can be successfully used in the process of cementing casing strings in boreholes.
- Źródło:
-
Nafta-Gaz; 2020, 76, 1; 46-56
0867-8871 - Pojawia się w:
- Nafta-Gaz
- Dostawca treści:
- Biblioteka Nauki
Artykuł