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Offshore Drilling and Completion
Published in Shashi Shekhar Prasad Singh, Jatin R. Agarwal, Nag Mani, Offshore Operations and Engineering, 2019
Shashi Shekhar Prasad Singh, Jatin R. Agarwal, Nag Mani
Because offshore drilling operations involve drilling multiple wells from a single platform, use of directional well drilling and extended reach drilling (ERD wells) is increasing to penetrate long intervals of pay zone and achieve more hydrocarbon exploitation from a single platform. As the difficulty of drilling such advanced wells is high compared to conventional well drilling, special completion type is required for such wells. Types of completion used in offshore operations is discussed in Section 3.2.
Novel Jatropha Oil Based Emulsion Drilling Mud Out performs Conventional Drilling Mud : A comparative study
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Himanshu Kesarwani, Amit Saxena, Shivanjali Sharma
The invert emulsion mud maintains the integrity of the formation by inhibiting clay swelling. It also provides lubricity to the system, reducing the torque and drag in highly deviated wells (Humood et al. 2019). The physiological and rheological properties are more resistant to the changes when exposed to elevated temperatures and pressures. Oil-Based Mud (OBM) are inert to salt and anhydrite contamination. They also provide better cutting carrying capacity as compared to the conventional drilling mud system. Compared to conventional vertical hole drilling, extended reach drilling wells with long horizontal sections require higher driving torque. This is because of the increased drag on the drill string, drill column, casing, and other equipment. This has led to higher friction and wear on the drilling equipment. Friction and wear preventive properties of oil-based drilling fluid is therefore important to keep oil extraction economical and sustainable. Many hydrocarbon producing nations have strict environmental laws over the usage and disposal of oil-based mud (Almudhhi 2016).