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Anti-sticking combined coating for threaded sleeve and preparation method thereof

A threaded connection and anti-sticking technology, which is applied in the field of anti-sticking combined coating and its preparation for threaded casings, can solve the problems of large environmental pollution and unsatisfactory prevention effect, and meet the technical requirements and ductility Good, the effect of improving the anti-sticking performance

Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used method in the past is to use various thread greases as lubricants to prevent sticking, but this method pollutes the environment a lot and the preventive effect is not very ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides an anti-galling composite coating for a threaded connection sleeve, which includes a diamond-like carbon (DLC) coating on the surface of an external thread with high hardness, wear resistance and self-lubrication, and a low hardness, good self-expandability, and anti-adhesion coating. The copper (Cu) coating on the surface of the internal thread; its preparation method comprises the following steps:

[0027] 1) Cleaning steps for externally threaded casing: soak the externally threaded casing in alkaline solution, ultrasonically remove oil, and clean it with ultrasonic pure water, then dry it with nitrogen.

[0028] 2) Clamping step: put the pretreated external thread sleeve on the workpiece stand of the ion beam-assisted magnetron sputtering coating equipment.

[0029] 3) Vacuum heating step: after the external threaded sleeve is put into the vacuum chamber, the vacuum is evacuated to 5×10 -3 Pa, and heated to 300 ℃.

[0030] 4) Plasma cleaning...

Embodiment 1

[0038] A preparation method of an anti-galling composite coating for a threaded connection sleeve of the present invention comprises the following steps:

[0039] (1) Use stainless steel inner and outer threaded casing (material: 1Cr18Ni9Ti) with a hardness of HB=187 after solution treatment at 1100 °C as the workpiece, after soaking in alkali solution, ultrasonic degreasing, ultrasonic pure water cleaning, and drying with nitrogen.

[0040] (2) Put the cleaned external thread sleeve on the workpiece stand of the ion beam-assisted magnetron sputtering coating equipment, and the coating equipment at least includes a vacuum chamber, a workpiece stand, a workpiece bias, an anode layer gas ion source, Arc target, sputtering target, gas supply system, heater, vacuum pump set and electrical control system.

[0041] (3) Three arc Cr targets with a diameter of 100mm are used as the bottom layer, installed on the right wall of the furnace, and a pair of sputtering Cr targets with a len...

Embodiment 2

[0050] A preparation method of an anti-galling composite coating for a threaded connection sleeve of the present invention comprises the following steps:

[0051] (1) Use stainless steel inner and outer threaded casing (material: 1Cr18Ni9Ti) with a hardness of HB=187 after solution treatment at 1100 °C as the workpiece, after soaking in alkali solution, ultrasonic degreasing, ultrasonic pure water cleaning, and drying with nitrogen.

[0052] (2) Put the cleaned external thread sleeve on the workpiece stand of the ion beam-assisted magnetron sputtering coating equipment, and the coating equipment at least includes a vacuum chamber, a workpiece stand, a workpiece bias, an anode layer gas ion source, Arc target, sputtering target, gas supply system, heater, vacuum pump set and electrical control system.

[0053] (3) Three arc Cr targets with a diameter of 100mm are used as the bottom layer, installed on the right wall of the furnace, and a pair of sputtering Cr targets with a len...

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Abstract

The invention discloses a thread gluing resistant combination coating layer of a threaded connection sleeve and a preparation method of the thread gluing resistant combination coating layer. The preparation method IS characterized in that the preparation method comprises the steps of preparing a DLC (Diamond Like Carbon) coating layer on an external thread surface and preparing a Cu (copper) coating layer on an internal thread surface; the external thread surface is coated with the DLC coating layer by utilizing ion beam assisted magnetron sputtering; the DLC coating layer has the characteristics of wear resistance, self-lubrication, and low possibility of deformation; the internal thread surface is coated with the Cu coating layer by utilizing an electroplate method; and the Cu coating layer has the characteristics of low hardness and good malleability, thereby significantly releasing stress concentration generated by the sleeve in a loading and unloading processes or in a working process. With the ingenious combination of the wear resistance and the deformation of the different coating layers on the internal thread surface and the external thread surfaces of an oil and gas well sleeve, the phenomenon of thread gluing caused by too big contact stress can be inhibited obviously, the thread gluing resistance of a screw thread is improved greatly, and the technical requirements of ISO13679 (International Standardization Organization 13679) on a screwing on / off test for the connection threads of the oil and gas well pipe are met.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of metal surface treatment, and in particular relates to an anti-galling composite coating for a threaded connection sleeve and a preparation method thereof. [0003] 【Background technique】 [0004] Threaded oil and gas well casing is one of the most commonly used tools in oil and gas drilling and production. Most of them are processed from materials with excellent wear resistance, corrosion resistance and oxidation resistance such as stainless steel, titanium alloy or high-strength alloy steel. . Due to the combined action of the casing's own gravity, external torque stress, corrosion stress and other complex loads, velcro failure often occurs at the contact between the internal and external threads. Sliding and leakage accidents have become key technical problems commonly encountered in oil and gas exploration at home and abroad. Glue failure is essentially caused by the combined action of adhesi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/16
Inventor 马胜利
Owner XI AN JIAOTONG UNIV