Drilling tool joint thread anti-attrition lubricating treatment process

A drilling tool joint and treatment process technology, applied in the direction of metal material coating process, coating, and surface coating liquid device, etc., can solve problems such as failure, easy pollution of the environment, thread wear of drill tool joints, etc., and achieve reduction Good friction coefficient and lubricating performance, and the effect of improving corrosion resistance

Pending Publication Date: 2021-07-02
SHANGHAI HILONG DRILL PIPE MATERIALS INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a drilling tool joint thread anti-friction lubrication treatment process, which has the advantages of good joint surface lubrication performance and environmental protection, and solves the situation that the drilling tool joint thread wears and causes its failure and The problem that the existing technology is easy to pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention discloses a friction-reducing and lubricating treatment process for the threads of drill tool joints. In this embodiment, the thread of the drill tool joint is subjected to surface laser processing and texture treatment, and the joint is subjected to gas nitriding treatment.

[0028] The joint surface texture treatment forms circular pits on the bearing surface and guide surface of the thread teeth, with a depth of 20 μm and a diameter of 10 μm, and the area accounts for 5% of the total surface area of ​​the thread. Nitriding treatment is for the entire surface of the joint. The nitriding method is gas nitriding, and the temperature is 520°C. The thickness of the formed surface compound layer is 15 μm, and the depth of the phase change layer is 400 μm.

[0029] The threaded surface hardness of the drill joint obtained in this example is 780HV, and it can maintain a good lubrication state during use, and the sticking condition of the joint is improved.

Embodiment 2

[0031] The invention discloses a friction-reducing and lubricating treatment process for the thread of a drill tool joint. In this embodiment, the thread of the drill tool joint is subjected to surface machining and texture treatment, and the joint is subjected to gas nitriding treatment.

[0032] The surface texture treatment of the joint forms a well-shaped groove on the bearing surface and guide surface of the thread tooth, with a depth of 30 μm and a width of 15 μm, and the area accounts for 7% of the total surface area of ​​the thread. Nitriding treatment is for the entire surface of the joint. The nitriding method is gas nitriding, and the temperature is 545°C. The thickness of the surface compound layer is 10 μm, and the depth of the phase change layer is 500 μm.

[0033] The threaded surface hardness of the drill joint obtained in this example is 900HV, and it can maintain a good lubrication state during use, and the sticking condition of the joint is improved.

Embodiment 3

[0035] The invention discloses a wear-reducing and lubricating treatment process for the threads of drill tool joints. In this embodiment, the thread of the drill tool joint is subjected to surface laser processing and texture treatment, and the joint is coated with a lubricating coating.

[0036] The surface texture treatment of the joint forms point-like protrusions on the bearing surface and guiding surface of the thread teeth, with a thickness of 5 μm and a diameter of 7 μm, and the area accounts for 3% of the total surface area of ​​the thread. Apply lubricating coatings including joint thread tooth and shoulder surfaces. The coating method is manual coating, the lubricating coating is an organic lubricating coating, and the main lubricants are molybdenum disulfide and polyacrylate nanoparticles. The dry film thickness of the coating is 25 μm.

[0037] The threaded surface of the drill joint obtained in this embodiment has an effective lubricating coating, can maintain a...

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Abstract

The invention relates to the technical field of surface treatment, and discloses a drilling tool joint thread anti-attrition lubricating treatment process. The treatment process comprises the following steps of texturing a drilling tool joint, and then carrying out surface lubricating treatment to obtain a petroleum pipe joint with a composite lubricating structure. According to the drilling tool joint thread anti-attrition lubricating treatment process, the surface of the thread is subjected to texturing treatment, the texturing structure can store lubricating oil and maintain the lubricating effect of the joint, and abrasive dust can be stored after the surface of the thread is abraded and falls off, so that the surface is prevented from being repeatedly damaged by the abrasive dust, nitriding treatment is conducted on the thread surface, the surface hardness is improved, the surface abrasion resistance is improved, a compound on the surface of a nitriding connector is provided with a loose layer, lubricating oil can be stored, the anti-abrasion and lubricating effects are achieved, the continuity of lubricating of the drilling tool joint is guaranteed, the thread gluing phenomenon is effectively reduced, the surface of the joint is coated with the lubricating coating, the lubricating agent in the coating can reduce the friction coefficient of the surface of the joint, and the thread gluing failure of the joint is reduced.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a process for antifriction and lubrication treatment of drill joint threads. Background technique [0002] Petroleum drilling tools include a drilling tool body and connecting joints. The joints at both ends of the pipe body are a male joint with an external thread and a female joint with an internal thread. During use, the drilling tool is connected with threads, and the internal and external threads are interference fit. The tooth surface is tightly connected and subjected to complex forces, and thread sticking such as surface adhesion and scratches often occurs, resulting in failure of the drilling tool. In order to reduce the failure of the drilling tool sticking. [0003] At present, the treatment method of drill tool joints mainly adopts the thread surface phosphating method, but this method will generate waste with high phosphorus content, and there is a problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02C23C8/36C23C8/24B05D7/00B05D7/24
CPCC23C8/02C23C8/36C23C8/24B05D7/00B05D7/24
Inventor 丁洁琼欧阳志英鲁喜宁谢孝文余世杰
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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