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Coating composition for drilling tool as well as preparation method and application thereof

A composition, coating technology, applied in the field of drilling, which can solve the problems of velcro, gaps, punctured shoulders and threads, etc.

Inactive Publication Date: 2014-02-05
四川华德莱斯石油装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the action of extremely high torque and pressure, the oil film formed by the thread grease will disappear or break, resulting in the phenomenon of thorns and sticking; moreover, the thread grease on the shoulder will be unevenly applied and blanks will appear during the thread grease application process At the phenomenon, there will be gaps and notches on the formed "metal ring"
In this way, the high-pressure drilling fluid will be lost, the shoulder and thread will be damaged, and the thread grease and the metal filler in it will be washed away. When drilling continues, the phenomenon of sticking will occur

Method used

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  • Coating composition for drilling tool as well as preparation method and application thereof
  • Coating composition for drilling tool as well as preparation method and application thereof
  • Coating composition for drilling tool as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The invention provides a kind of preparation method of coating composition for drilling tool, comprises the following steps:

[0043] Dissolving nano-copper and polytetrafluoroethylene powder in an organic solvent to obtain an organic mixture;

[0044] The organic mixed liquid is mixed with a metal binder to obtain a coating composition for drilling tools.

[0045] The present invention preferably dissolves the nano-copper and polytetrafluoroethylene micropowder described in the above technical solution in an organic solvent to obtain an organic mixed liquid. The present invention has no special limitation on the way of dissolving. Nano-copper and polytetrafluoroethylene micropowder can be added to the organic solvent, or the organic solvent can be added to the mixed powder of nano-copper and polytetrafluoroethylene micropowder. A homogeneous organic mixture was obtained after stirring. The present invention has no special limitation on the method of stirring, and the...

Embodiment 1

[0054] Add 12.5g of copper oxide with a mass purity of more than 98% to 100mL of absolute ethanol to dissolve, weigh 2g of polyvinylpyrrolidone and add it to the copper oxide solution obtained above, and place the obtained mixed solution in an ultrasonic oscillator for ultrasonication. Dispersion, the working frequency of the ultrasonic oscillator is 40KHZ, the oscillation time is 5min, and a uniform mixed solution is obtained;

[0055] Add 3.5g±0.2g of hydrazine hydrate solution with a mass concentration of 3.5g / 10mL to the obtained mixed solution, and complete the dropwise addition within 10 minutes;

[0056] Place the obtained mixed solution with reducing agent in an ultrasonic oscillator and oscillate at a working frequency of 20KHZ to 40KHZ. During the process of oscillating, the mixed solution will produce bubbles on nominal basis, and the liquid will slowly turn red, and the oscillating reaction will stop after 30 minutes. , the obtained reaction solution was left to st...

Embodiment 2

[0061] The polytetrafluoroethylene micropowder that the particle diameter D50 of 16 weight parts of embodiment 1 preparations and 5 weight parts is about 10nm is dissolved in the ethylene glycol monomethyl ether of 65 weight parts, after stirring evenly, add 14 wherein The cyanoacrylate binder in parts by weight is uniformly mixed to obtain the coating composition for drilling tools.

[0062] The coating composition for drilling tool obtained in this example was sprayed on the outer surface of the drilling tool thread, the drilling tool thread was a round thread, and the sprayed thickness was 12 μm, and the obtained drilling tool could be used after drying.

[0063] The present invention investigates the threaded connection of the drilling tool coated with the coating composition for the drilling tool provided by the present invention on an existing make-up machine to test its anti-friction performance.

[0064] First, with the maximum torque as the target make-up, the influen...

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Abstract

The invention provides a coating composition for a drilling tool. The coating composition for the drilling tool comprises the following components in percentage by weight: 16-28wt% of nano copper, 5-10wt% of polytetrafluoroethylene micro powder, 10-14wt% of a metal adhesion agent and 50-65wt% of an organic solvent. Due to the adoption of the nano copper in the coating composition for the drilling tool, the abrasion coefficient and friction of the surface of the material can be greatly reduced, so that the lubricating property of the material can be greatly improved; the polytetrafluoroethylene micro powder plays a similar role of a ball bearing in the friction process, reduces the plane abrasion and plays a role of reducing the abrasion; a large number of free electrons exist on the PTFE (polytetrafluoroethylene) surface layer, easily react with metals on the friction surface and generate metal fluorides; due to the metal fluorides, the abrasion is reduced. Consequently, due to the coating composition for the drilling tool, thread gluing and torque errors of the drilling tool can be reduced, so that the drilling tool failure can be reduced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a coating composition for drilling tools, a preparation method and application thereof. Background technique [0002] Drilling tools are exclusive tools used in drilling work. The main function of drilling tools is to transmit drill bit pressure and rotary torque to the drill bit during the process of drilling rock formations, and deliver drilling flushing fluid to the bottom of the hole to collect rock cores. The force of drilling tools in the well is very complex, and its service conditions are harsh, such as the nature of the loads on the drill string, including static loads, alternating loads, and impact loads; the loading sequence such as load spectrum; the stress state such as tension, compression, bending, Torsion, shear, contact and various compound stresses; temperature, environmental media such as air, water, drilling fluid, H 2 S, CO 2 and NaCl et al. [0003] Due ...

Claims

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Application Information

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IPC IPC(8): C09D4/04C09D4/06C09D127/18C09D121/00C09D131/04C09D7/12
Inventor 陈志明孟昭何体财乔惊喜
Owner 四川华德莱斯石油装备股份有限公司
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