Method for preparing wear-resistant coating of resistance-reduction and torsion-reduction tool of large-displacement well through laser

Abstract

The invention discloses a method for preparing a wear-resistant coating of a resistance-reduction and torsion-reduction tool of a large-displacement well through laser. The method comprises the following steps: pretreating the surface of the resistance-reduction and torsion-reduction tool of the large-displacement well by deoiling and derusting the surface of the surface of the resistance-reduction and torsion-reduction tool of the large-displacement well under the room temperature; selecting specially-prepared nickel-based alloy powder, adjusting an automatic powder feeding device, enabling alloy powder out of an automatic powder feeding head to just fall into a laser cladding tank, adjusting powder feeding amount and enabling the thickness of an alloy powder coating to reach 0.8-1.2mm; carrying out laser cladding of a wear-resistant and corrosion-resistant coating by automatically feeding the alloy powder into the laser cladding tank by using a synchronous powder feeding device, feeding high-power focused laser beams and the automatic powder feeding head along an axial direction, rotating the resistance-reduction and torsion-reduction tool of the large-displacement well according to a set rotation rate, and forming a uniform and dense laser cladding layer on the external surface of a horizontal roller; and carrying out subsequent heat treatment by slowly cooling the resistance-reduction and torsion-reduction tool after broadband laser cladding of the nickel-based alloy, fully wrapping the resistance-reduction and torsion-reduction tool by using heat preservation cotton, and distressing and annealing the resistance-reduction and torsion-reduction tool under the room temperature.

Description

technical field [0001] The invention relates to a method for repairing drilling equipment for extended-reach wells, in particular to a method for manufacturing wear-resistant coatings for drag-reducing and torsion-reducing tools for extended-reach wells by laser. Background technique [0002] The drag and torsion reduction tool for extended-reach wells is one of the important equipment in the drilling technology of extended-reach wells, which bears all the lateral forces originally borne by the drill pipe tie. In extended-reach wells, the friction and torque gradually increase with the increase of well depth. Extended reach well drilling tools work under high torque and high friction conditions for a long time, which seriously affects the service life of drill pipes, and at the same time increases the probability of downhole accidents and complex situations. The friction torque of the whole well is relatively large, and vicious accidents such as pipe sticking and drill tool...

AI Technical Summary

Problems solved by technology

Due to the physical combination between the electroplating coating and the base material, the binding force is not high, and the coating often falls off during long-term operation of the drag reduction and torque reduction tools in extended-reach wells, and vicious accidents such as drill sticking and twisting of drilling tools are prone to occur

At the same time, the electroplating process also has the problem of environmental pollution caused by sewage discharge.