Utilization of GGBFS blended cement pastes in well cementing

Alp, Barış
In well cementing, the cement slurry is exposed to the conditions far different than those of ordinary Portland cement (PC) used in construction. After placement, hardened cement paste should preserve integrity and provide zonal isolation through the life of the well. American Petroleum Institute (API) Class G cement is the most common cement type used in various well conditions. Class G cement has a high degree of sulfate resistance which makes it more stable than PC when subjected to the compulsive well conditions. Ground granulated blast furnace slag (GGBFS) blended cement has a long history of use in the construction industry, but is not extensively used in well cementing applications. This study presents an experimental program to investigate the applicability of CEM I and GGBFS blended cement pastes in the well cementing industry. Class G cement and blends of CEM I and GGBFS with the proportions (80:20), (60:40), (40:60) and (20:80) are prepared with same water/cement ratio (0.44) as restricted for Class G cement in API Specification 10A to be tested. The cement pastes are cured for ages of 1 day, 7 days and 28 days at 80 ˚C which represents the condition of medium-depth oil wells. The presence of an adequate amount of GGBFS in the blend improves properties of the cement paste especially in the long term and at elevated temperatures. They are comparable to and under some conditions more preferable to the neat Class G cement paste. However, the physical properties of cement pastes prepared with neat Class G cement develop within the first day and negligible change is observed later. In order to get better hydration for the blended cement paste, the amount of CEM I must be kept more than GGBFS in the blend to provide sufficient alkalinity for the hydration of GGBFS. The conclusions obtained from this study indicate that GGBFS blended CEM I produces high quality well cementing material when compared to Class G cement.


Strength assesment of Turkish cements
Kul Gül, Nazlı İpek; Yaman, İsmail Özgür; Akkaya, Ayşen; Department of Cement Engineering (2015)
Cement, a hydraulic binder material, is the most important of building materials. The compressive strength test method is used to determine the quality of cement. The cement manufacturers are obliged to carry the CE Marking in accordance with the EN 197 standards for cement production in Europe and Turkey and in accordance with the Building Materials Regulation (CPR). Within the scope of CE Marking, the product certification body performs sampling from the factory in specified periods. The samples obtained ...
Utilization of fly ash-portland cement binary systems to control alkali-silica reaction
Çelen, Ahmet Ziya; Akgül, Çağla Meral.; Department of Civil Engineering (2019)
The highly alkaline pore solution of the portland cement concrete is not an ideal environment for certain reactive aggregates with poorly-crystalline or amorphous silica phases. In this environment, these aggregates partially or completely disintegrate resulting in formation of a hydrophilic, amorphous gel mainly composed of alkalis and water from the pore solution of the hydrated cement matrix and silica from the aggregates. The newly formed alkali-silica reaction (ASR) gel can expand by absorbing huge amo...
Using Cappadocia tuff as a natural pozzolan in the cement production
Atan, Mustafa Can; Turanlı, Lütfullah; Department of Civil Engineering (2015)
For the concrete world, it is increasing day by day in importance to use the pozzolans as a cement replacement material or concrete admixture. To be able to use them in this aim, many scientific researchers have been carried out to observe the material's mechanical, physical, and durability characteristics. Moreover, using pozzolan in cement production up to 50%, actually tells that the CO2 emission is decreased nearly by 50%. Furthermore, whether the pozzolan is natural or a vi byproduct, the material offe...
Production of low-energy cements using various industrial wastes
Canbek, Oğulcan; Erdoğan, Sinan Turhan; Department of Civil Engineering (2018)
One economical method of lowering the cement related impact of concrete is partial replacement using industrial wastes like fly ash,natural pozzolan,etc. On the one hand its maximum kiln temperature being 150-200°C lower than that required for PC and higher grindability of its clinker make calcium sulfoaluminate(CSA) cements preferable. This study aims to produce CSA cement with partially or completely replace traditional raw materials with some industrial wastes such as fly ash,red mud and desulfogypsum an...
A study on the early-strength improvement of slag cements
Akgün, Erdinç; Yaman, İsmail Özgür; Department of Cement Engineering (2009)
Use of alternative raw materials, especially industrial by-products, is necessary for a sustainable cement industry. By replacing clinker with industrial by-products, consumption of natural resources and energy is decreased. Therefore, both economical and environmentally friendly cements are produced. Several industrial by-products such as fly ash, silica fume, and slag, one of the most widely used industrial by-products, can be used to produce standard blended cements. Besides its many advantages, slag cem...
Citation Formats
B. Alp, “Utilization of GGBFS blended cement pastes in well cementing,” M.S. - Master of Science, Middle East Technical University, 2012.