Non-contact measurement method for running state of oil drilling rig crown block fast wheel

Abstract

The invention relates to a petroleum drilling machine crown block fast wheel operation state non-contact measurement method and utilizes a non-contact mode to measure a crown block fast wheel operation state. The method comprises steps that firstly, metal shape characteristics of a surface of a petroleum drilling machine crown block fast wheel is acquired through a special sensor; secondly, the rotation speed, the direction and the position of the fast wheel can be calculated through a core control unit according to the characteristics; and thirdly, the position, the direction, the operation speed and the well depth of a moving hook can be calculated through a user program according to the operation state of the crown block fast wheel. According to special requirements for a petroleum drilling machine, the invention further provides a sensor especially for a mounting method of the petroleum industry crown block fast wheel. The method is not only applied to the petroleum industry, but also can be employed in occasions requiring non-contact high precision measurement on fast-rotation objects.

Description

technical field [0001] The invention relates to a measurement method, in particular to a non-contact measurement method capable of detecting the running state of the fast wheel of the crown block of an oil drilling rig. Background technique [0002] Many devices in the oil drilling industry need to measure the position, running speed and direction of the hook, so as to be able to calculate the well depth or detect the anti-collision. The running status such as free hook position, running speed and direction can only be measured indirectly. The usual method is to use an encoder installed on the shaft of the winch drum to measure. This method has always had the following disadvantages: [0003] 1. The accuracy is not high, which is caused by the non-linear length of each layer of wire rope in the winch drum. [0004] 2. Calibration is cumbersome. A lot of parameters need to be input during calibration, and re-calibration is required after the steel wire rope is replaced, rewo...

AI Technical Summary

Problems solved by technology

[0003] 1. The accuracy is not high, which is caused by the non-linear length of each layer of wire rope in the winch drum

[0004] 2. Calibration is troublesome. You need to input a lot of parameters during calibration, and you need to re-calibrate after replacing the wire rope, rewinding the wire rope or moving the well team. When the parameters entered during these calibrations are inaccurate, the accuracy will also be reduced.

[0005] 3. It is inconvenient to install. The winch drum of each well team may not be able to provide the encoder installation shaft. In this case, the installation is extremely difficult

[0006] In theory, there is another method to obtain the running state of the free hook by measuring the running state of the fast wheel of the crane. This method is very accurate, because the running state of the crane can directly reflect the running state of the free hook, but there are various difficulties. For example, a shaft encoder cannot be installed on the fast wheel, and secondary processing cannot be performed on the surface of the fast wheel, otherwise it will affect the dynamic balance and mechanical strength of the fast wheel, so there is still no practical solution.

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