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Pumping-unit wellhead sealing filler with polished rod repairing capability

A technology of sealing packing and pumping unit, which is applied in sealing/packing, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of affecting the sealing effect of packing packing, uneven surface of polished rod, excessive wear of packing, etc.

Active Publication Date: 2019-07-05
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problem in the background technology that the existing polished rod seriously affects the sealing effect of the packing due to the excessive wear of the packing due to surface unevenness or damage, and provides a pumping unit wellhead sealing packing capable of repairing the polished rod

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) First, heat 25kg of rubber particles, 5kg of vinyl chloride copolymer resin, 3kg of alumina, 15kg of phthalate diester, 15kg of epoxy resin powder, 5kg of talcum powder, and 5kg of SAP resin in the oven to 50-65°C, and then send into the mixer for continuous pre-mixing;

[0029] (2) After heating 5kg of 46-58# industrial paraffin to 80-90°C to melt, slowly add it into the running mixer, mix it with the pre-mixed raw materials, and continue stirring until completely absorbed and mixed;

[0030] (3) After detecting that the temperature of the material in the agitator drops below 45°C, add 1 kg of polyurethane foaming agent and continue stirring for 20 minutes, then add 5 kg of molybdenum disulfide grease and 3 kg of base oil, and continue stirring until well mixed;

[0031] (4) After the mixed material is lowered to normal temperature, pour 2.5 kg of talcum powder into it again to mix and discharge the material, and keep it sealed.

Embodiment 2

[0033] (1) First, heat 50kg of rubber particles, 15kg of vinyl chloride copolymer resin, 5kg of alumina, 25kg of phthalate diester, 20kg of epoxy resin powder, 10kg of talcum powder, and 10kg of SAP resin to 50-65°C, and send them into Continuous pre-mixing in the mixer;

[0034] (2) Heat 20kg of 46-58# industrial paraffin to 80-90°C and melt it, then add it to the running mixer, mix it with the pre-mixed raw materials, and continue stirring until completely absorbed and mixed;

[0035] (3) After detecting that the temperature of the material in the agitator has dropped below 45°C, put in 2kg of polyurethane foaming agent and continue to stir for 20 minutes, then add 10kg of molybdenum disulfide grease and 5kg of base oil, and continue to stir until well mixed;

[0036] (4) After the mixed material is lowered to normal temperature, 5 kg of talcum powder is poured into it again, mixed and discharged, and sealed for preservation.

[0037] The pumping unit wellhead sealing packi...

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PUM

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Abstract

The invention relates to a pumping-unit wellhead sealing filler with polished rod repairing capability. The invention mainly solves the problem that the sealing effect of packing filler is seriously influenced due to excessive filler abrasion caused by uneven surface of an existing polished rod. The pumping-unit wellhead sealing filler with polished rod repairing capability comprises the followingcomponents in percentage by mass: 25-50% of rubber particles, 15-20% of epoxy resin, 5-20% of crude wax, 5-10% of super absorbent polymer (SAP) resin, 5-15% of vinyl chloride copolymer resin, 15-25%of a plasticizer, 3-5% of a dehumidifier, 1-2% of a foaming agent, 0.2-1.0% of a curing agent, 5%-15% of talcum powder, 5%-10% of molybdenum disulfide lithium-based lubricating grease and 3%-5% of base oil. According to the pumping-unit wellhead sealing filler with polished rod repairing capability, grooves of surface defects of the polished rod are basically filled, leveled and hardened, and a hot repairing effect is achieved, so that excessive filler abrasion caused by uneven surface of the polished rod 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 of a pumping unit capable of repairing polished rods. Background technique [0002] In recent years, due to the advancement of the scale of tertiary oil recovery in oilfields, various factors have caused surface damage to the polished rods of pumping wells due to electrochemical corrosion, chemical corrosion, electrical burns, and mechanical scraping. Damage to the polished rods also caused serious damage to the packing. Wear and tear directly leads to problems such as serious leakage at the wellhead, and it takes time and effort to replace the polished rod, which brings great trouble to oil field production. [0003] For the above problems, the current mainstream solution direction in the industry is mostly focused on the promotion of wear-resistant alloy coated polished rods, such as patent number CN200710118049.7 "An ...

Claims

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Application Information

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IPC IPC(8): C08L21/00C08L27/06C08L63/00C08L91/06C08L33/04C08K13/02C08K5/12C08K3/22C08K3/34C08K3/30C08J9/04E21B33/03
CPCC08J9/0023C08J9/0066C08J9/0095C08J9/04C08J2321/00C08J2427/06C08J2433/04C08J2463/00C08J2491/06E21B33/03
Inventor 汤凯赵浩男王洪亮杨海波张文宇李静
Owner PETROCHINA CO LTD
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