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Christmas tree oil-resistant sealing grease composition and preparation method thereof

A technology of sealing grease and christmas tree, which is applied in the field of sealing grease, which can solve the problems of insufficient high temperature performance, dissolution, flushing, and difficult opening of valves, and achieve good colloidal stability and water resistance, and is not easy to squeeze or flush The effect of loss, opening torque drop

Active Publication Date: 2017-08-08
武汉博达特种润滑技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Poor sealing, resulting in lax valve switch
[0005] 2) Poor lubricity, large valve switching torque
[0006] 3) The high temperature performance does not meet the requirements, and it is easy to lose
[0007] 4) Poor oil resistance, easily dissolved and washed off by crude oil or oil
[0009] a. The base oil used in extreme pressure potassium base grease is ordinary mineral oil, and the base oil of ordinary sealing grease on the market is also mineral oil or ester-based synthetic oil, which generally has low viscosity and poor adhesion. The force is not strong, and it is easy to be squeezed or washed away during the movement of the valve switch or during the hydraulic test of the valve before leaving the factory, resulting in a decrease in the sealing performance of the valve
[0010] b. Mineral oil and crude oil contained in extreme pressure lithium-based grease belong to hydrocarbons and can be miscible. The mineral oil or ester-based synthetic oil contained in commercially available common sealing grease can also be miscible with crude oil. Therefore, the two types The sealing grease is easily dissolved by crude oil, and does not have the characteristics of resistance to crude oil dissolution, and the retention time on the valve plate of the valve is short
[0011] c. The high-temperature dropping point of extreme-pressure lithium-based grease is around 190°C, and it is easy to lose at high temperature. Most of the common sealing grease thickeners on the market are hydrocarbon thickeners, and their high-temperature performance is also poor.
[0012] d. Extreme pressure lithium-based grease or commercially available ordinary sealing grease does not contain solid lubricants and antifriction agents, and the opening and closing torque is large, resulting in large valve switching torque, difficult operation or valve opening

Method used

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  • Christmas tree oil-resistant sealing grease composition and preparation method thereof
  • Christmas tree oil-resistant sealing grease composition and preparation method thereof
  • Christmas tree oil-resistant sealing grease composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1) 725.5 kilograms of adipic acid 1,2-propylene glycol polyester (V 100 =395.48mm 2 / s) and 145 kg of organic bentonite are added to the reaction kettle, heated and stirred to raise the temperature to 60±5°C, add 35 kg of 95% industrial ethanol, stir at a constant temperature of 60±5°C for 15 minutes, continue to stir and raise the temperature to 130±5°C , evacuate to -0.05mpa, keep constant temperature and constant vacuum for dealcoholization and dehydration for 1.5 hours.

[0067] 2) Add 50 kg of colloidal graphite, 30 kg of tungsten disulfide, 5 kg of 4.4 methyl bisphenol, 7.5 kg of medium-alkali value synthetic calcium sulfonate, and 2 kg of benzotriazole in sequence, and mix and stir for 30±5 minutes. Discharge into barrel.

[0068] 3) Naturally cool to 60±5°C, and grind three times with a three-roll mill to obtain christmas tree oil-resistant sealant.

Embodiment 2

[0070] 1) 640.5 kilograms of adipic acid 1,2-propylene glycol polyester (V 100 =461.73mm 2 / s) and 160 kg of organic bentonite were added to the reaction kettle, heated and stirred to 60±5°C, added 45 kg of 95% methanol, stirred at 60±5°C for 15±5 minutes, and continued to stir to raise the temperature to 130±5°C 5°C, vacuumize to -0.05mpa, keep constant temperature, constant temperature and constant vacuum for dealcoholization and dehydration for 1.5 hours.

[0071] 2) Add 100 kg of colloidal graphite, 30 kg of tungsten disulfide, 10 kg of synthetic calcium sulfonate with medium alkali value, 5 kg of synthetic calcium sulfonate with high alkali value, 2.5 kg of 2,6 di-tert-butyl-p-cresol and 5 kg of N-phenyl-α-aniline and 2 kg of benzotriazole were mixed and stirred for 30±5 minutes, and discharged into the bucket.

[0072] 3) Naturally cool to 60±5°C, and grind three times with a three-roller mill to obtain christmas tree oil-resistant sealant.

Embodiment 3

[0074] 1) 699 kilograms of adipic acid 1,2-propylene glycol polyester (V 100 =692.21mm 2 / s) and 150 kg of organic bentonite were added to the reaction kettle, heated and stirred to 60±5°C, 37.5 kg of 96.6% acetone was added, stirred at 60±5°C for 15±5 minutes, and the temperature was raised to 130±5 ℃, vacuum to -0.05mpa, keep constant temperature and constant vacuum to remove acetone and dehydration for 1.5 hours.

[0075] 2) Add 50 kilograms of colloidal graphite, 50 kilograms of tungsten disulfide, 7.5 kilograms of 2,6-di-tert-butyl p-formic acid, 5 kilograms of high base value synthetic calcium sulfonate and 1 kilogram of benzotrihydroazole derivatives and mix and stir for 30 ±5 minutes, the material is discharged into the bucket.

[0076] 3) Naturally cool to 60±5°C, and grind three times with a three-roll mill to obtain christmas tree oil-resistant sealant.

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Abstract

The invention provides a Christmas tree oil-resistant sealing grease composition. The Christmas tree oil-resistant sealing grease composition is prepared from the following components in percentage by mass: 40.5 to 89.55 percent of hexanedioic acid 1,2-propylene glycol polyester, 5 to 25 parts of organic bentonite, 3 to 15 parts of colloid black lead, 1 to 5 percent of tungsten disulfide, 0.2 to 2 percent of antioxidant, 0.2 to 2 percent of antirust agent, 0.05 to 0.5 percent of metal deactivator, and 1 to 10 percent of dispersing agent. The invention further provides a preparation method for the Christmas tree oil-resistant sealing grease composition. The Christmas tree oil-resistant sealing grease composition provided by the invention is prepared by refining high-viscosity hexanedioic acid 1,2-propylene glycol polyester base oil, an organo-bentonite thickening agent and a plurality of additives, and has superior viscosity, leak tightness, oil resistance and friction resistance. An oilfield Christmas tree valve adopting the Christmas tree oil-resistant sealing grease composition has low starting torque, is convenient to operate, and has superior high temperature performance, superior thermal stability and extremely-long service life.

Description

technical field [0001] The invention relates to the technical field of sealing grease, in particular to a christmas tree oil-resistant sealing grease composition and a preparation method thereof. Background technique [0002] The Christmas tree, also known as the "Christmas tree", is a control device located at the opening leading to the top of the oil well, including valves for measurement, maintenance and oil production, safety systems and a series of monitoring equipment. The Christmas tree connects the production pipelines and flowlines from the downhole, and at the same time acts as a barrier to isolate the top of the oil well from the external environment. It includes many valves that can be used to regulate or prevent the produced natural gas, crude oil vapor and liquid from gushing out of the well. The main function is to control the production of oil and gas and prevent oil and gas from blowing out. [0003] X-mas tree valves adopt open stem or dark stem flat plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M177/00C10N30/02C10N30/06C10N30/08C10N40/34C10N50/10
CPCC10M169/044C10M177/00C10M2201/041C10M2201/066C10M2201/1036C10M2207/024C10M2207/026C10M2207/122C10M2209/1023C10M2215/064C10M2215/223C10M2219/044C10M2219/046C10M2219/106C10N2010/04C10N2030/02C10N2030/06C10N2030/08C10N2030/36C10N2040/34C10N2050/10
Inventor 曹杰
Owner 武汉博达特种润滑技术有限公司
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