Device for measuring abrasion of drill rod and sleeve

Abstract

The invention discloses a device for measuring abrasion of a drill rod and a sleeve. The device comprises a bearing structure, the drill rod, a rotating mechanism, a sleeve and a horizontal force application mechanism, wherein the bearing structure is used for bearing all components of the device, one end of the drill rod penetrates through the sleeve, and the rotating mechanism is used for driving the drill rod to rotate; the two ends of the drill rod are fixed to the bearing structure through rotating components; the sleeve is fixed to the bearing structure through a directional sliding mechanism, the directional sliding mechanism limits a moving path, and the sliding direction of the directional sliding mechanism is perpendicular to the axis of the drill rod; and the telescopic end of the horizontal force application mechanism makes contact with the outer wall of the sleeve, the telescopic direction of the horizontal force application mechanism is parallel to the sliding direction of the directional sliding mechanism, and the horizontal force application mechanism is used for pressing the sleeve and the drill rod. According to the device, the drill rod is relatively fixed, a drill column moves and presses the drill rod, the structure is relatively simple, meanwhile, the drill column is guided by the directional sliding mechanism to move, the drill rod and the sleeve are in linear contact, and all positions are evenly stressed and abraded, the abraded portion of the sleeve is fixed, and the actual abrasion condition can be simulated.

Description

technical field [0001] The invention relates to the technical field of friction and wear measuring devices, in particular to a device for measuring the wear of drill pipes and casings. Background technique [0002] During the drilling process, the drill pipe rotates relative to the casing, and the outer diameter of the connecting pipe between the drill pipes is larger than that of the drill pipe, and the wear between it and the casing is also the most serious. Therefore, in order to ensure the safety of the wellbore within the service life Evaluate the degree of wear between the casing and the drill pipe joint. At present, there is a device for evaluating the friction between the drill pipe and the casing, but it is difficult to simulate the linear friction between the actual connection section and the casing downhole. The experimental device and method of casing friction and wear, one end of the drill pipe is inserted into the casing, the casing is fixed, the drill pipe mo...

AI Technical Summary

Problems solved by technology

At present, there is a device for evaluating the friction between the drill pipe and the casing, but it is difficult to simulate the linear friction between the actual connection section and the casing downhole. The experimental device and method of casing friction and wear, one end of the drill pipe is inserted into the casing, the casing is fixed, the drill pipe moves, and the force lever is used to push the drill pipe to move to make it fit and rub against the casing, in order to accurately simulate the uniformity of the pipe section Friction requires that the drill pipe should be translated in the direction of the inner wall of the casing during the bonding process, otherwise the outer wall of the drill pipe and the inner wall of the casing must not be parallel, resulting in a point contact between the two, resulting in local eccentric wear, which cannot simulate the actual wear of the pipe section However, as far as this device is concerned, the drill string is connected with the force lever, the spindle box, etc., and the supporting equipment is very complicated to move as a whole. Due to the lack of fixed facilities, the end vibrated greatly, which in turn caused the drill pipe and the sleeve to contact and rub against different parts along the circumference, and even collided. This is inconsistent with the linear friction in the actual formation, and the simulation results are reliable. The degree is also reduced

In addition, the Chinese patent application CN201420680047 discloses a device for measuring the sliding friction coefficient between the drill pipe and the casing. The casing is relatively movable, and the casing is used to move to compress the drill pipe. Its structure is relatively simple. However, the casing is positioned in the casing holder by using the rubber ring. When the drill string rotates, the casing is easy to rotate, resulting in The entire casing is worn in many places along the circumference, which does not match the wear of the fixed part of the casing under real conditions

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