Synchronous control system of injection head and wound roll of continuous oil pipe operating machine and control method thereof

Abstract

The invention discloses a synchronous control system of an injection head and a wound roll of a continuous oil pipe operating machine and a control method thereof, wherein the control system comprisesan injection head enclosed driving subsystem and a wound roll open subsystem. The wound roll open subsystem comprises a load sensitive variable pump, a manual proportional valve, a wound roll motor,a variable back pressure valve and an overflow valve; the variable back pressure valve is installed on an oil return channel of the wound roll motor, and the overflow valve is installed on an oil feedchannel of the wound roll motor. The control method mainly comprises two steps of pushing down oil pipes and pulling up the oil pipes. Because of the actions of the overflow valve and the variable back pressure valve in a system loop, continuous oil pipes are straightened and have certain tensile force whenever being pushed down or pulled up in the operation process, thereby realizing the synchronous and rapid match of an injection head motor and the wound roll motor. The synchronous control system has the advantages of reliable operation, simple structure, low cost and convenient installation, maintenance and adjustment.

Description

technical field [0001] The invention relates to a coiled tubing operating machine in the oil exploitation industry, in particular to a synchronous control system and a control method for an injection head and a reel of the coiled tubing operating machine. Background technique [0002] At present, the coiled tubing machines used in various domestic oilfields are completely dependent on imports. The injection head and reel of this coiled tubing machine are driven by the injection head motor and the reel motor to rotate respectively. The push-down and lift-up speed of coiled tubing is controlled by manual control, and the motor drive is controlled by manual control. When the coiled tubing machine is working, the motor of the injection head runs under high pressure, and the reel motor runs under low pressure. , between the two to complete the action of conveying the coiled tubing; one end of the coiled tubing is clamped in the injection head clamp block, driven by the injection ...

AI Technical Summary

Problems solved by technology

However, due to the linear error and hysteresis of the proportional valve, the device has reliability problems in the working process, and the structure is complex and the manufacturing cost is high.

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