Development of improved and low-cost drillingfluids and cement slurries in oil wells
Başlık çevirisi mevcut değil.
- Tez No: 770125
- Danışmanlar: DOÇ. DR. GABRİELLA PETRA FEDERER KOVáCSNé
- Tez Türü: Doktora
- Konular: Petrol ve Doğal Gaz Mühendisliği, Petroleum and Natural Gas Engineering
- Anahtar Kelimeler: Drilling fluid, cement, geopolymer, fly ash, rice husk ash, rheology, temperature
- Yıl: 2022
- Dil: İngilizce
- Üniversite: Miskolci Egyetem [ME] University of Miskolc
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Petrol ve Doğal Gaz Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 131
Özet
Özet yok.
Özet (Çeviri)
Drilling fluid and well cementing are indispensable components of drilling operations. In general, it is desirable that the drilling fluid used be simple and contain few additives additives at maintaining its high performance. Thus, the maintenance of the drilling mud and the monitoring of the parameters that need to be followed becomes easier. However, the flow characteristics of the drilling mud, which is in constantly circulation in the well, differ at the entrance and exit of the well. Therefore, a wide variety of drilling fluid additives are mixed into the drilling mud to maintain the flow properties such as viscosity, weight, gel strength and filtration of the drilling mud at the required levels. These additives are often quite expensive, which results in an increase in the overall cost of drilling operations. On the other hand, cementing operation is also crucial for the successful completion of well drilling. Cement is used to fill the gap called annulus between the casing lowered into the well and the formation. The cementing process is applied to the placement of the drill string, to prevent mud leaks, to prevent uncontrolled fluid flow from the formations to the surface through the well, to abandon the wells and to close the formations that are no longer produced. Generally, ordinary portland cement is employed as a binder in the world. Although a very significant amount of cement is produced every year, it is predicted that it will increase even more in the future. A significant amount of CO2 is released during cement production, which causes a serious environmental concern. In addition, cement production is a costly process as it requires a significant amount of energy. The aim of the thesis is to develop improved, cost effective and environmentally friendly water-based drilling fluid and cement slurry systems, which have superior rheological and filtration properties and are able to meet the requirements of the drilling operation, using fly ash (FA) and rice husk ash (RHA). An extensive experimental work was conducted to achieve the relevant goal. To this end, several different types of drilling fluid systems were designed using FA and RHA, and their rheological and filtration properties were measured and analyzed at ambient and elevated temperature and potential of differential sticking tendency of the drilling fluid was studied considering the effect of different particle size of FA by grinding in a stirred media mill. Subsequently, the cement used in the cementing operation was initially partially replaced by FA and RHA, then completely replaced by FA by forming geopolymer material to reduce or eliminate the amount of cement required. The performance of the relevant cement slurries has also been analyzed both under ambient conditions and increased temperature as well as when exposed to drilling mud contamination. On the other hand, effect of particle size of FA in both driling fluid, cement and geopolymer slurries was examined by conducting the with the different times of grinding process in a thumbling ball mill. In addition, hydraulic performance of the driling fluids formulated with FA depending on increasing temperature were calculated by considering parameters cutting carrying index, flow behaviour index and minimum annular velocity required to clean bottom of the well efficiently and rheological model analysis of the fluid was performed. In conclusion, in the thesis, different types of drilling muds with improved hydraulic performance were developed with FA, which is a large amount of industrial waste, and RHA, which also constitutes a large amount of agricultural waste at ambient and elevated temperature. Also, cement and geopolymer with improved rheological and filtration properties were designed by partially changing the amount of cement with FA and RHA and completely replacing cement by FA, respectively. In addition, it was reveal that particle size of fly plays a great role on the rheological and filtration properties of driling fluid, cement and geopolymer slurries and Herschel-Bulkley model provides the estimation of the iii rheological parameters of drilling fluid with high accuracy. Consequently, an alternative method was developed for the recycling of FA and RHA, as well as contributing to the reduction of drilling costs and environmental problems with the drilling mud and cement slurries developed in this thesis. Also, with the determined Herschel Bulkley model, more accurate assessment of well hydraulic could be achieved. Finally, it worths to be noted that the new comprehensive findings obtained in this thesis can be used as a guide for future studies. 2022, 129 pages.
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