Calibration device for underground bit pressure and torque measurement short section

Abstract

The invention discloses a calibration device for an underground bit pressure and torque measurement short section, which belongs to the technical field of underground engineering while drilling, comprises a base, and is characterized in that a short section fixing head is connected onto a short section fixing support, a measurement short section is arranged between the short section fixing support and a short section centralizing support, a short section adapter is connected onto the measurement short section, a lead screw is arranged between the lead screw support and the short section centralizing support, one end of the lead screw is connected with a variable connecting sleeve, a worm wheel shaft is arranged between the worm wheel support and the lead screw support, a worm wheel is installed on the worm wheel shaft, one end of the worm wheel shaft is connected with a transmission connecting sleeve, the other end of the worm wheel shaft is installed on the worm wheel support, and the other end of the lead screw is connected with the transmission connecting sleeve. One end of the worm is connected with the clutch, and the other end is connected with a reel. According to the device, full-mechanical structure transmission is adopted, two modes of weight calibration and rapid calibration are provided, the calibration device can be corrected through weight calibration, and the calibration precision and the calibration efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of downhole engineering while drilling, in particular to a calibration device for downhole drilling pressure torque measuring nipples. Background technique [0002] With the continuous deepening of oil exploration and development, the exploitation of oil and gas fields is developing in the direction of low pressure and low permeability, special location formations, deep layers, and thin layers. There are more and more deep wells, ultra-deep wells, and slim wells. Mud logging sensors cannot reflect the real drilling conditions at the bottom of the well in time, and it is difficult to detect and correctly handle the precursors of complex downhole conditions in a timely manner. Measurement. [0003] The downhole engineering parameter measurement sub-section measures downhole WOB and torque mainly through strain gauges to form an electric bridge to convert the strain of the drill collar into an electrical signa...

AI Technical Summary

Problems solved by technology

[0005] 1. It can only achieve static loading and unloading calibration, and the measured WOB torque is a discrete point, which cannot reflect the dynamic response characteristics of the measuring sub;

[0006] 2. The magnification of the force using the lever principle is limited. If you want to calibrate the drilling weight of 30 tons, the length ratio of the force arm is 10, and the weight of the weight reaches 3 tons. It is necessary to continuously increase the length of the force arm to reduce the weight of the weight. The force arm is easily deformed, which affects the calibration accuracy. At the same time, it is inconvenient to carry large weights

However, since the calibration device is composed of a hydraulic system and sensors, the long-term use of the hydraulic system and sensors will cause errors in the calibration device, which will affect the calibration accuracy of the measuring sub.

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