engleski

Current Trends in Oil Drilling Systems R&D with Emphasis on Croatian Oil Drilling Sector – A Review

A notable portion of contemporary oil drilling rigs are still equipped with mature drilling equipment such as manually-operated mechanical brake actuators for drill-string and tool weight-on-bit (WoB) and rate-of-penetration (RoP) control. Moreover, the main drilling rotary drive is usually being controlled without regard for drill-string compliance-related tool stick-slip effect, which shortens the useful life of the tool (drill-bit) and other drill-string drive mechanical components. In addition, drilling fluid pumps are typically being operated without regard for optimal pipeline pressure control. Thus, in order to meet increasingly stringent requirements on the drilling system performance, such mature drilling systems need to be retrofitted with advanced WoB/RoP and drill-string drive control systems, as well as coordinated drilling fluid pump control. Finally, the drilling process itself is extremely energy consuming, so it would also be worthwhile to analyze the operation of the drilling rig power-plant and adjacent microgrid for typical operating scenarios, in order to find appropriate measures for energy (fuel) expenditure reduction. To this end, this paper presents an overview of research and development results of such drilling automation and energy management systems, with particular emphasis on the retrofitting designs currently being researched, developed and fielded by the Croatian oil drilling-related businesses.

Drilling rig retrofitting ; weight-on-bit and rate-of-penetration control ; rotary electrical drive active damping speed control ; stick-slip mitigation methods ; mud pump pressure control ; power-plant energy management control

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