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Thread gluing resistant combination coating layer of threaded connection sleeve and preparation method of thread gluing resistant combination coating layer

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: 2015-09-30
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

[0022] The present invention is an anti-sticking composite coating for threaded connection sleeves, comprising a diamond-like (DLC) coating on the surface of the external thread with high hardness, wear resistance and self-lubrication and low hardness, good self-extensibility and anti-adhesion The copper (Cu) coating on the internal thread surface; Its preparation method comprises the following steps:

[0023] 1) Cleaning steps for externally threaded casing: soak the externally threaded casing in lye, ultrasonic degreasing, ultrasonic pure water cleaning, and blow dry with nitrogen.

[0024] 2) Clamping step: put the pretreated outer threaded sleeve on the workpiece platform of the ion beam assisted magnetron sputtering coating equipment.

[0025] 3) Vacuum heating step: After the outer threaded casing is installed in the vacuum chamber, vacuumize to 5×10 -3 Pa, and heated to 300°C.

[0026] 4) Plasma cleaning step: Introduce high-purity Ar at 10-30ml / min into the vacuum ch...

Embodiment 1

[0034] A method for preparing an anti-sticking combined coating of a threaded sleeve of the present invention comprises the following steps:

[0035] (1) Stainless steel inner and outer threaded casings (material: 1Cr18Ni9Ti) with a hardness of HB=187 after solution treatment at 1100°C were used as workpieces, soaked in lye, ultrasonically degreased, cleaned with ultrasonic pure water, and dried with nitrogen.

[0036] (2) Put the cleaned externally threaded bushing into the workpiece gantry of the ion beam assisted magnetron sputtering coating equipment, which at least includes a vacuum chamber, a workpiece gantry, a workpiece bias, an anode layer gas ion source, Arc target, sputtering target, gas supply system, heater, vacuum pump group and electrical control system.

[0037] (3) Three arc Cr targets with a diameter of 100 mm are used as the bottom layer, installed on the right wall of the furnace, and a pair of sputtering Cr targets with a length × width of 600 mm × 70 mm a...

Embodiment 2

[0046] A method for preparing an anti-sticking combined coating of a threaded sleeve of the present invention comprises the following steps:

[0047] (1) Stainless steel inner and outer threaded casings (material: 1Cr18Ni9Ti) with a hardness of HB=187 after solution treatment at 1100°C were used as workpieces, soaked in lye, ultrasonically degreased, cleaned with ultrasonic pure water, and dried with nitrogen.

[0048] (2) Put the cleaned externally threaded bushing into the workpiece gantry of the ion beam assisted magnetron sputtering coating equipment, which at least includes a vacuum chamber, a workpiece gantry, a workpiece bias, an anode layer gas ion source, Arc target, sputtering target, gas supply system, heater, vacuum pump group and electrical control system.

[0049] (3) Three arc Cr targets with a diameter of 100 mm are used as the bottom layer, installed on the right wall of the furnace, and a pair of sputtering Cr targets with a length × width of 600 mm × 70 mm a...

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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

【Technical field】 [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an anti-sticking combination coating for a threaded connection sleeve and a preparation method thereof. 【Background technique】 [0002] Threaded oil and gas well casing is one of the most commonly used tools in oil and gas drilling, mostly made of stainless steel, titanium alloy or high-strength alloy steel and other materials with excellent wear resistance, corrosion resistance and oxidation resistance . Due to the combined action of complex loads such as the gravity of the casing itself, external torque stress, corrosion stress, etc., sticking failures often occur at the contact between the internal and external threads. The light ones affect the structural integrity and sealing of the casing, and the severe ones cause The occurrence of slip and leak accidents has become a key technical problem commonly encountered in oil and gas exploitation at h...

Claims

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Application Information

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