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New Concepts and Future Trends
Published in Cesar Ovalles, Subsurface Upgrading of Heavy Crude Oils and Bitumen, 2019
Avvaru and coworkers reviewed the applications of ultrasound energy and cavitation technologies to the petroleum industry [Avvaru et al. 2018]. These processes are aimed at improving the well productivity by increasing the permeability of the near wellbore region. Several examples have been reported in the literature such as the breaking of the emulsion generated between invading oil-based mud filtrate and formation water, inorganic scale precipitation, plugging of pore throats by fines migration, and deposition of paraffin and asphaltenes. The authors stated that the main advantages of the ultrasonic technology are low energy consumption, the possibility to treat the near wellbore selectively, no harm to the well and casing, and that these routes are eco-friendly and economically acceptable [Avvaru et al. 2018].
Examination of drill pipe corrosion in water-based drilling fluids under wellbore conditions
Published in Corrosion Engineering, Science and Technology, 2018
Mortatha Al-Yasiri, Mohammed Al-Khateeb, Dongsheng Wen
Every rotary drilling process comprises three structures that simultaneously operate while drilling a wellbore: a rotation system that rotates the drill pipe, a hydraulic system that raises and turns down the drill string into the wellbore and a circulatory system that performs all the functions associated with the fluid movement. This fluid is referred to as the drilling fluid or drilling mud. The drilling fluid is essential for completing the drilling operation because it could increase oil recovery and reduce the time required to obtain the primary production [1]. The difficulties experienced during drilling operations in the petroleum industry have led to the preparation of different types of drilling mud. Nevertheless, besides chemicals, these types of mud majorly comprise water, oil and gas. Based on the base fluid, these types of drilling mud are categorised as water-, oil- and gas-based mud [2]. The oil-based mud is suitable for most drilling operations and is less corrosive than the other types. However, some of these drilling operations are restricted due to environmental regulations [3]. In contrast, the water-based mud is inexpensive, can be easily controlled and is environmentally friendly [3]. Shokoya confirmed that the water-based drilling fluids are the most favourable among the other types owing to their aforementioned advantages [4].