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Wellhead sealing filler of pumping unit with slow release self-lubricating function

A sealing packing and self-lubricating technology, applied in the field of oil production engineering, can solve the problems of poor lubrication performance and sealing effect of wellhead packing box, easy leakage of medium, etc.

Active Publication Date: 2019-06-28
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to overcome the problems of poor lubricating performance and sealing effect of the wellhead packing box and easy leakage of the medium existing in the background technology, and provide a sealing packing with slow-release self-lubricating function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) First, put 25kg of rubber particles with a diameter between 1-10mm and 5kg of talc powder into the mixer for continuous stirring and premixing, then heat 15kg of 46-62# semi-refined paraffin wax to 80-90°C and completely melt , add to the running mixer, mix with the pre-mixed raw materials, and continue to stir for 30-60 minutes until completely absorbed and mixed;

[0027] (2) When the temperature in the agitator drops to 50-65°C, add 5kg of vinyl chloride copolymer resin, 3kg of alumina, 15kg of phthalic acid diester, and 5kg of epoxy resin and mix continuously for 30 minutes;

[0028] (3) After detecting that the temperature of the material in the agitator has dropped below 45°C, continue to put in 15 kg of 52#—62# semi-refined crude paraffin wax powder, 0.5 kg of foaming agent polyurethane, and 0.5 kg of curing agent isocyanate and continue stirring for 10-20 minutes , then add 5 kg of molybdenum disulfide grease and 3 kg of paraffin-based mineral oil, and conti...

Embodiment 2

[0031] (1) First, put 45kg of high-glue rubber particles with a diameter between 1-10mm and 10kg of talcum powder into the mixer for continuous stirring and premixing, then heat 20kg of 46-62# industrial paraffin to 80-90°C and completely melt , add to the running mixer, mix with the pre-mixed raw materials, and continue to stir for 30-60 minutes until completely absorbed and mixed;

[0032] (2) When the temperature in the agitator drops to 50-65°C, add 10kg of vinyl chloride copolymer resin, 5kg of alumina, 25kg of phthalic acid diester, 10kg of epoxy resin particles and other ingredients and continue to mix and stir for 30min;

[0033] (3) After detecting that the temperature of the material in the agitator has dropped below 45°C, continue to put in 25kg of 46-62# industrial paraffin powder, 1 kg of polyurethane foaming agent, 1 kg of curing agent isocyanate and continue stirring for 10-20 minutes, and then disulfide Add 15kg of molybdenum grease and 5kg of paraffin-based mi...

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Abstract

The invention relates to wellhead sealing filler of a pumping unit with a slow release self-lubricating function and solves the problem that the energy consumption is increased and the service life ofpacking filler is shortened as a medium is easy to leak because an existing wellhead sealer is poor in sealing effect. The wellhead sealing filler of the pumping unit with the slow release self-lubricating function is prepared from the following components in percent by mass: 25-45% of rubber particles, 2-5% of epoxy resin, 15-20% of 56-62# semi-refined paraffin wax, 10-15% of 52-62# semi-refinedparaffin wax powder, 5-10% of chloroethylene copolymerized resin, 15-25% of a plasticizer, 3-5% of a dehumidifier, 0.5-1% of a foamer, 0.2-1.0% of a curing agent, 5-15% of talc powder, 5-15% of molybdenum disulfide lithium-based lubricating grease and 3-5% of base oil. According to the wellhead sealing filler of the pumping unit with the slow release self-lubricating function, the material of thepacking filler is modified. Solid and liquid slow release lubricant structures are provided. The lubricating ability can be slowly released according to the contact pressure condition of a polish rodand the filler, so that the stroke resistance of the polish rod is reduced, the energy consumption of the equipment is reduced, and the service life of the packing filler is prolonged.

Description

technical field [0001] The invention relates to the technical field of oil production engineering in oil fields, in particular to a wellhead sealing packing for pumping units with slow-release self-lubricating function. Background technique [0002] In the oil field production system, the wellhead packing of the pumping unit is mostly made of integral rubber or its derivatives. In order to ensure its good operation, some lubricating grease needs to be added at the same time when filling to reduce the friction between the polished rod and the packing. At the same time, the crude oil contained in the produced fluid also plays a certain lubricating effect on the two. In recent years, affected by the rise of water content and the loss of conventional grease, the sealing effect of the wellhead packing box has deteriorated, and the problem of medium leakage has become increasingly prominent. In view of the above problems, the current mainstream solution direction in the industry i...

Claims

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Application Information

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IPC IPC(8): C08L21/00C08L63/00C08L27/06C08L91/00C08L91/06C08K13/02C08K5/12C08K3/22C08K3/30C08K3/34C08J9/04
Inventor 汤凯杨海波张文宇王洪亮李静申勇辉
Owner PETROCHINA CO LTD
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