Anti-corrosion, wear-resistant and anti-drag drill rod

Abstract

The invention discloses an anti-corrosion, wear-resistant and anti-drag drill rod which is used for solving the problems of corrosion fatigue failure of the drill rod caused by corrosion and wear and pressure relief of drilling of a horizontal well under the condition of alternating stress. According to the technical scheme, different ion co-permeation deposition modes and process parameters are selected according to drilling geology and underground fluid properties of service of the drill rod and the type of used drilling fluid by referring to data such as the failure mechanism, part, rule and characteristic of the drill rod, and the inner hole wall and the outer circle face of the drill rod are subjected to ion co-permeation deposition on the surface of the drill rod. And respectively depositing different or same anti-corrosion wear-resistant antifriction ions and alloys thereof. Although the alloy deposition layer is very thin, the service life of the drill rod is prolonged by times, and the friction coefficient between the drill rod and a sleeve, stratum rock and a borehole cuttings bed is remarkably reduced. The anti-corrosion, wear-resistant and resistance-reducing drill rod is low in machining difficulty and wide in application range, and the technical blank that the anti-corrosion, wear-resistant and resistance-reducing drill rod cannot be industrially produced in the prior art is filled.

Description

technical field [0001] The invention relates to an anti-corrosion, wear-resistant and drag-reducing drill pipe used for exploration and development of geological resources (petroleum, natural gas, geothermal water and underground minerals), and belongs to the field of mechanical processing. Background technique [0002] Corrosion and wear of exploration and development equipment for geological resources (oil, natural gas, geothermal water, and underground minerals) are known as two world-class problems. In the domestic oil and gas exploration and development industry alone, there are about 29,200 oil wells in varying degrees. corrosion and wear. With the increase of domestic oil and gas field development life and equipment service life, especially the exploration and development of high-sulfur oil and gas reservoirs and other oil and gas reservoirs containing acidic corrosive media, corrosion and wear have brought increasingly prominent problems to the safe and stable operat...

AI Technical Summary

Problems solved by technology

Most of the existing drill pipes are subject to corrosion and wear by their own materials. Although some drill pipes are lined with anti-corrosion and corrosion-resistant layers in their inner holes, or are electroplated with tungsten alloy and other anti-corrosion and wear-resistant materials on the outer surface of the drill pipes, it is because: 1. The anti-corrosion and wear-resistant layer does not effectively cover all surfaces (inner and outer surfaces) of the drill pipe, and there are many cracks, pinholes and dew points; 2. The mechanical properties of the tungsten alloy anti-corrosion and wear-resistant layer and the base material of the drill pipe are quite different, and cracks are visible Cracks; 3. Weak bonding between the anti-corrosion and wear-resistant layer and the drill pipe matrix, and the shedding of the anti-corrosion and wear-resistant layer leads to poor anti-corrosion and wear resistance; 4. The interactive friction coefficient between the surface of the anti-corrosion and wear-resistant layer and the casing, formation, cuttings bed and drilling fluid Larger factors, not only did not prolong the service life of the drill pipe, but caused serious decompression due to the large friction coefficient of the drill pipe, resulting in low drilling speed, shallow drilling depth and short horizontal drilling section in horizontal wells.

At present, there is no method that can not only reduce the decompression phenomenon in the drilling process of horizontal wells and extended-reach wells, but also effectively improve the anti-corrosion, wear-resisting and drag-reducing performance of drill pipes in corrosive and abrasive environments, so that the drill pipes The service life is close to the stress fatigue strength value of the drill pipe material

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