APA 6th Edition GAURINA-MEĐIMUREC, N., SIMON, K. & MATANOVIĆ, D. (2004). LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM. Rudarsko-geološko-naftni zbornik, 16 (1), 75-80. Retrieved from https://hrcak.srce.hr/13366
MLA 8th Edition GAURINA-MEĐIMUREC, NEDILJKA, et al. "LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM." Rudarsko-geološko-naftni zbornik, vol. 16, no. 1, 2004, pp. 75-80. https://hrcak.srce.hr/13366. Accessed 12 Nov. 2019.
Chicago 17th Edition GAURINA-MEĐIMUREC, NEDILJKA, KATARINA SIMON and DAVORIN MATANOVIĆ. "LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM." Rudarsko-geološko-naftni zbornik 16, no. 1 (2004): 75-80. https://hrcak.srce.hr/13366
Harvard GAURINA-MEĐIMUREC, N., SIMON, K., and MATANOVIĆ, D. (2004). 'LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM', Rudarsko-geološko-naftni zbornik, 16(1), pp. 75-80. Available at: https://hrcak.srce.hr/13366 (Accessed 12 November 2019)
Vancouver GAURINA-MEĐIMUREC N, SIMON K, MATANOVIĆ D. LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM. Rudarsko-geološko-naftni zbornik [Internet]. 2004 [cited 2019 November 12];16(1):75-80. Available from: https://hrcak.srce.hr/13366
IEEE N. GAURINA-MEĐIMUREC, K. SIMON and D. MATANOVIĆ, "LABORATORY INVESTIGATIONS OF SILICATE MUD CONTAMINATION WITH CALCIUM", Rudarsko-geološko-naftni zbornik, vol.16, no. 1, pp. 75-80, 2004. [Online]. Available: https://hrcak.srce.hr/13366. [Accessed: 12 November 2019]
Abstracts The silicate-based drilling fluid is a low solids KCl/polymer system with the addition of soluble sodium or potassium silicate to enhance inhibition and wellbore stability. Silicate-based drilling fluids exhibit remarkable shale and chalk stabilizing properties, resulting in gauge hole and the formation of firm cuttings when drilling reactive shales and soft chalks. Silicates protect shales by in-situ gellation when exposed to the neutral pore fluid and precipitation, which occurs on contact with divalent ions present at the surface of the shale. Also, silicates prevent the dispersion and washouts when drilling soft chalk by reacting with the Ca2+ ions present on chalk surfaces of cutting and wellbore to form a protective film. The silicate-based drilling fluid can be used during drilling hole section through shale interbeded anhydrite formations because of its superior shale stabilizing characteristics. However, drilling through the anhydrite can decrease the silicate concentration and change rheological and filtration fluid properties. So, the critical concentration of calcium ions should be investigated by lab tests. This paper details the mechanism of shale inhibition using silicate-based drilling fluid, and presents results of lab tests conducted to ascertain the effect of Ca2+ ions on silicate level in the fluid and the fluid properties.