Dual-motor driving system for petroleum drilling and control method thereof

Abstract

The invention discloses a dual-motor driving system for petroleum drilling and a control method thereof. The dual-motor driving system is used for driving dual-motor cooperative operation control of slush pumps, a winch and a rotating disc, and comprise a first transmission mechanism and a second transmission mechanism which are mutually coupled on a transmission box, wherein a first motor, a first speed regulation type hydraulic coupler and a first transmission structure are in transmission connection in sequence, a second motor, a second speed regulation type hydraulic coupler and a second transmission structure are in transmission connection in sequence, and a low-pressure room control cabinet controls the first motor and the second motor through a first frequency converter and a secondfrequency converter correspondingly; and a motor side control cabinet and a drill floor side control cabinet communicate with the low-pressure room control cabinet through optical fibers, the first transmission mechanism and the second transmission mechanism drive the slush pumps to rotate, and branch power output by the first transmission mechanism and / or the second transmission mechanism is input into the winch and the rotating disc.

Description

technical field [0001] The invention relates to the technical field of oil-to-electricity conversion of oil drilling power, in particular to a dual-motor drive system for oil drilling and a control method thereof. Background technique [0002] Existing diesel engines or diesel generators that provide power for drilling production consume a large amount of diesel and cause pollution to the surrounding environment. Major oil fields have gradually begun to use the power grid to power AC variable frequency motors within the coverage of the power grid, and provide power for drilling through AC variable frequency motors. For the power required for drilling due to the wide distribution of drilling conditions, direct use of a single motor drive has high costs, large losses, low reliability, and is not economical. Two motors of the same type are used. When the drilling power demand is small, a single motor is used. running; when the demand is large, two motors are used to run in para...

AI Technical Summary

Problems solved by technology

[0002] Existing diesel engines or diesel generators that provide power for drilling production consume a large amount of diesel oil and cause pollution to the surrounding environment. Major oil fields gradually use the grid to supply power to AC variable frequency motors within the coverage of the power grid, and provide power for drilling through AC variable frequency motors

For the power required for drilling due to the wide distribution of drilling conditions, direct use of a single motor drive has high costs, large losses, low reliability, and is not economical. Two motors of the same type are used. When the drilling power demand is small, a single motor is used. operation; when the demand is large, two motors are used to run in parallel

When two motors are running in parallel, if the torque of the two motors is inconsistent, the motors will drag each other, and the motor with a higher speed will drive the motor with a lower speed to rotate, which will cause the motor to enter the power generation state and cause the inverter to fail. , but there are few researches on the design and control of oil drilling dual motor drive system

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