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4 мая 2020
Read the text. Say what you have learnt about the prime movers and explain their function. Write your answer
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The prime movers in a rotary drilling rig are those pieces of equipment that provide the power to the entire rig. Up until World War II, rotary rigs were traditionally powered by steam engines. Diesel engines became the norm after the war. Recently, while diesel engines still compose the majority of
power sources on rotary rigs, other types of engines are also in use. Natural gas or gasoline engines are commonly used, as are natural gas or gasoline powered reciprocating turbines, which generate electricity on site. The resulting electricity is used to power the rig itself. Other rotary rigs may use electricity directly from power lines. Most rotary rigs these days require 1,000 to 3,000 horsepower, while shallow drilling rigs may require as little as 500 horsepower. Rotary rigs designed to drill in excess of 20,000 feet below surface may require much more than 3,000 horsepower.
On diesel-electric rigs, powerful engines drive large electric generators. They, in turn, produce electricity that flows through cables to electric switch and control equipment enclosed in a control cabinet. From the control gear, electricity goes through more cables to electric motors. The manufacturer attaches the motors directly to the equipment to be driven – for example, the drawworks or mud pumps.
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5 мая 2020
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Read the text. Say what you have learnt about the prime movers and explain their function. Write your answer.docx
2020-05-08 10:01
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