Height measuring system for oil rig rotary hook as well as calibrating and measuring method

Abstract

The invention discloses a height measuring system for an oil rig rotary hook, which includes a winch fixed on a drilling platform, a winch sensor, a rope guide wheel and a pulley block both mounted at the top part of a drilling derrick, the rotary hook and a controller, wherein a steel wire rope lap wound on the winch is connected with the rotary hook by means of the rope guide wheel and the pulley block; the winch sensor is electrically connected with the controller; a gear is coaxially mounted and arranged on the rope guide wheel; another gear is correspondingly mounted on a rotating shaft of the winch sensor; the rotating shaft of the winch sensor is engaged and linked with the rope guide wheel through the gears; and a housing of the winch sensor is fixed to a fixing frame of the rope guide wheel. The system further includes a wireless transmitting module, a wireless receiving module and a control center, wherein the winch sensor is connected with the wireless transmitting module through the controller, and the wireless receiving module is connected with the control center. The invention further discloses a calibrating and measuring method for the system. The height measuring system, as well as the calibrating and measuring method, has the advantages of high accuracy, simple wire arrangement, remote transmission distance, strong interference resistance, and simplicity and accuracy in calibration.

Description

technical field [0001] The invention relates to oil drilling equipment, in particular to an oil drilling rig hook height measuring system, calibration and method. Background technique [0002] like figure 1 , figure 2 As shown, the modern drilling technology is to fix the drill bit 42 on the drill pipe 41, hang the drill pipe 41 through the hook 4, utilize its own weight and combine with the motor to drive the rotation, so as to realize the drilling function of the oil drilling rig. In this process, the judgment of the working conditions of various drilling rigs, the calculation of the depth of the well and the position of the drill bit 42 cannot lack the important parameter of the hook 4 height. Parameters such as well depth and drill bit 42 position are particularly important in drilling engineering. They play an important role in judging the rock formation at the bottom of the well, making work progress, and understanding downhole complex conditions. Once the calculati...

AI Technical Summary

Problems solved by technology

In theory, this calibration method can accurately calculate the actual rope retractable length corresponding to each layer due to the winding of the steel wire rope 3 on the drum. Etc. cause the wrong number of rope layers to be calculated, which leads to errors in the calculated rope retractable length, which in turn affects the calculated value of the height of the hook 4

And like the 10-point calibration, the calibration requires high precision and is difficult to implement, and the more points are calibrated, the greater the human error will be.

[0009] The above three traditional measurement methods, in addition to their own calibration problems, due to the difficulty in fixing the encoder during installation, cause shaking during the rotation of the drum, which also affects the calculation result of the height of the hook 4

In practical application, if there is no real-time monitoring by technicians, the calibrated hook 4 height value will deviate greatly from the actual height value in a short period of time, which will make the drilling parameter system judge incorrectly, and in serious cases will cause drilling failure. Equipment damage, even causing major accidents

Even if there is a technician to correct it in time, due to the complexity of the calibration, it needs the cooperation of many people to complete it. Sometimes because of a calibration error at one point, repeated re-calibration of all points is required, resulting in a great waste of personnel and time, and takes up too much time. Production time, which affects the timeliness of drilling engineering, is a reason that cannot be ignored that affects the progress of work on the drilling site

Moreover, the oil drilling site environment is particularly complex, and the implementation of traditional wired communication wiring is particularly difficult, and it is also easily affected by factors such as the surrounding electromagnetic field, resulting in a large deviation in the measured encoder value

[0010] Due to the large error in the height measurement of the traditional hook 4, it can only serve as an auxiliary monitoring function in practical applications. In order to achieve the well depth accuracy designed in the drilling plan and obtain accurate values, in the third calibration method, it is necessary to On-site technicians have to manually measure and count each drill pipe before using it, resulting in a great waste of personnel and time. In addition, due to the limitation of the processing technology and technical conditions of the drill pipe, each The length of ordinary drill pipes is between 9.2 meters and 9.7 meters, which is not a fixed value, and it also brings trouble to the measurement

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