ÇAĞRILI KONUŞMALAR / KEYNOTES Invited Speeches ... - TPJD

Investigation of the Effect of Additives on Strength Properties of Cement
Ahmet Asena, Onur Karabacak, Mustafa Hakan Özyurtkan, İbrahim Metin Mihçakan,
Gürşat Altun
İstanbul Technical University, Faculty of Mines, Department of Petroleum and Natural Gas
Engineering, Ankara
Cementing is one of the most essential operations for drilling and well completion techniques.
Cement is used in drilling operations to support and protect casing, to prevent flow through annular
space outside the casing, to stop flow into vugular or fractured formation and to isolate or close
an abandoned portion of a well. In addition, it is also a desired property for cement to develop
early high compressive strength to reduce drilling cost. Therefore, different cement additives are
used to provide desired needs. In this study, 1, 7, and 28-day of compressive strength variation
of Class G cement having commercial additives (viscosity controller and water loss reducer) with
different concentration at ambient conditions have been investigated experimentally. Amount of
used additives was within the limits as specified by producer. It has been observed that cement
samples having water loss additive have resulted in lower compressive strengths in short terms
than those of samples having viscosity control additive. Otherwise, it has also been determined
that the viscosity control additive have yielded a property that tends to increase the compressive
strengths in long terms. First time in this study, it has been observed that one-day cement
samples prepared with high amount of water loss additive (1% by weight of cement) have been
deformed plastically under compressive loads indicating that have no ability to carry loads or to
develop compressive strength.
Keywords : Compressive Strength, Additives, viscosity controller, water loss reducer, Plastic
Deformation
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