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A method for preparing a wear-resistant band of nicrbsi-tin gradient composite coating on the surface of a drill pipe joint

A drill pipe joint and composite coating technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of no large-scale mass production and application, casing wear and high price, etc. The effect of eliminating macroscopic interfaces, reducing manufacturing costs, and improving bond strength

Active Publication Date: 2019-03-29
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the wear-resistant belts used at home and abroad mainly include the following types: 1) Overlay welding of cemented carbide. During the overlay welding process, the hard phase is easy to decompose, and the wear mechanism during use is abrasive wear, which is likely to cause a large number of bushings. Wear and tear; 2) American Anke Technology Company has developed the ARNCO series wear-resistant belt, which has the characteristics of high hardness, toughness, high wear resistance, friendly casing, and can ensure no cracks in the surfacing process, but it is expensive. Unbearable; 3) Domestically, Nate505J wear-resistant strip materials, Nate707J wear-resistant strip materials, PT100 wear-resistant strip materials, BoTn3000 wear-resistant strip materials, diamond composite drill pipe joint wear-resistant materials, etc. are only occasionally published in some professional publications Reported and most of them refer to foreign molding products, and most of them are still in the research and test stage and have not been mass-produced and put into application
[0004] According to the applicant's search and verification: there is no precedent at home and abroad for the preparation of NiCrBSi-TiN composite gradient coating wear-resistant belt by plasma spraying plus induction remelting post-treatment process

Method used

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  • A method for preparing a wear-resistant band of nicrbsi-tin gradient composite coating on the surface of a drill pipe joint
  • A method for preparing a wear-resistant band of nicrbsi-tin gradient composite coating on the surface of a drill pipe joint
  • A method for preparing a wear-resistant band of nicrbsi-tin gradient composite coating on the surface of a drill pipe joint

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:

[0037] (1) Surface pretreatment of base material

[0038] Clean and degrease the drill pipe joints with absolute ethanol at room temperature, and then perform sandblasting to finally obtain a surface with a roughness of 50-75 μm;

[0039] (2) Preparation of Gradient Coating

[0040] Nickel-based alloy powder NiCrBSi is used as the main material for preparing the wear-resistant coating. Prepare the mixed powder of each layer according to the ratio of NiCrBSi and Ti powder in each layer of the composite gradient coating below, and put the mixed powder of each layer into the grinding machine Mixed in medium for 60min, the powder should be dried at 105℃ for 1 hour before spraying; during the spraying process, through in-situ chemical reaction 2Ti+N 2 =2TiN prepares NiCrBSi-TiN composite gradient coating; the rotatio...

Embodiment 2

[0055] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:

[0056] (1) Surface pretreatment of base material

[0057] The base material is degreased with absolute ethanol at room temperature, and then sandblasted to obtain the roughness R a ≈5.0μm surface;

[0058] (2) Preparation of Gradient Coating

[0059] The rotation speed of the sample during spraying is about 15r / min, and the sample is preheated with a spray gun for 3 minutes to reduce the internal stress generated during the spraying process. The preheating temperature is 120°C.

[0060] Spray the first layer of pure NiCrBSi layer with a thickness of 90 μm;

[0061] The second layer is 95%NiCrBSi+5%Ti, with a thickness of 90μm;

[0062] The thickness of the third layer 90%NiCrBSi+10%Ti is 70μm;

[0063] The fourth layer is 85%NiCrBSi+15%Ti, with a thickness of 75μm;

[0064] The fifth layer is 80%NiCrBSi+20%T...

Embodiment 3

[0073] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:

[0074] (1) Surface pretreatment of base material

[0075] The base material is degreased with absolute ethanol at room temperature, and then sandblasted to obtain the roughness R a ≈5.0μm surface;

[0076] (2) Preparation of Gradient Coating

[0077] The rotation speed of the sample during spraying is about 15r / min, and the sample is preheated with a spray gun for 3 minutes to reduce the internal stress generated during the spraying process. The preheating temperature is 120°C.

[0078] Spray the first layer of pure NiCrBSi layer with a thickness of 80 μm;

[0079] The second layer is 95%NiCrBSi+5%Ti, with a thickness of 100μm;

[0080] The thickness of the third layer 90%NiCrBSi+10%Ti is 80μm;

[0081] The fourth layer is 85%NiCrBSi+15%Ti, with a thickness of 70μm;

[0082] The fifth layer is 80%NiCrBSi+20%...

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Abstract

The invention discloses a method for preparing a NiCrBSi-TiN gradient composite coating abrasion-resistant belt on the surface of a drill rod joint. The method includes the following steps that (1) surface pre-treatment of a base material is performed; (2) a gradient coating is prepared, specifically, mixed powder of each layer is prepared according to the proportions of NiCrBSi powder and Ti powder in each layer in a composite gradient coating shown as follows, the mixed powder of each layer is put in a grinding miller to be mixed, the powder is dried for 0.7-1.2 hours at the temperature of 100 DEG C to 110 DEG C before spraying, and then plasma spraying of each layer is performed in sequence; and (3) induction remelting aftertreatment of the coating is performed, specifically, the drill rod joint is coated with a high-temperature antioxidant coating material with the thickness being 0.2-0.3 mm after being subjected to composite gradient spraying, and then induction melting treatment is performed through high-frequency induction heating equipment. According to the method, the process operation is simple, the feasibility is high, the abrasion resistance is remarkably improved, and abrasion to the abrasion-resistant material is small.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a method for preparing a wear-resistant band of a drill pipe joint after plasma spraying and induction remelting. Background technique [0002] With the continuous reduction of global oil and gas energy sources, the difficulty of oil and gas exploration and development has further increased. During the drilling process, the working conditions of drilling tools have become more and more severe, and the wear of drill pipe joints and casings has become more and more serious. Reducing the torsional and bending strength of the drill pipe and the anti-scratching and internal pressure resistance of the casing string will cause the entire well to be scrapped and greatly increase the mining cost. At present, surfacing wear-resistant bands on oil drill pipe joints is an effective measure to effectively protect drill pipes and casings. [0003] The wear-resistant band of the drill pipe jo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/06C23C4/18
CPCC23C4/06C23C4/10C23C4/134C23C4/18
Inventor 董艳春陈景柏万丽宁
Owner HEBEI UNIV OF TECH
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