Oilfield ultrahigh-pressure acid-resistant rubber seal material and preparation method thereof

A rubber sealing and ultra-high pressure technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult rubber mixing and processing technology, the decline of material compression permanent deformation performance, etc., to overcome leakage and extrusion tearing phenomenon. Effect

Active Publication Date: 2013-11-20
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding fine-particle high-structure nano-carbon black is the most common and effective way to improve the hardness of rubber materials. However, when the amount of carbon black increases to more than 100 parts, the hardness can meet the design requirements, but the compression set performance of the material decreases significantly, and Rubber mixing process is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the formula shown in Table 1, each component is weighed, and then added to the open mill for mixing until it is uniform, and then the sheet is produced to obtain the mixed rubber. The mixed rubber is vulcanized for one stage on a flat vulcanizing machine, and the vulcanization temperature is controlled to be 160°C, the vulcanization time is 40 minutes, and the vulcanization pressure is 10Mpa; the rubber is taken out from the flat vulcanizer and then subjected to two-stage vulcanization in an oven at 170°C for 2 hours to obtain vulcanized rubber.

[0027] Table 1 Oilfield high-pressure acid-resistant sealing material formula (1)

[0028] serial number Raw material name Dosage (serving) 1 Hydrogenated nitrile rubber 85 2 Nitrile rubber 15 3 Zinc oxide 5 4 stearic acid 1 5 Antiager MB 2 6 Carbon black N220 30 7 Carbon black N330 25 8 Fumed silica 15 9 Phenolic Resin 8 10 liquid ni...

Embodiment 2

[0031] After weighing each component according to the formula shown in Table 2, add it to the open mill in turn for mixing until uniform, and then release the sheet to obtain the mixed rubber. The mixed rubber is vulcanized for one stage on a flat vulcanizing machine, and the vulcanization temperature is controlled at 160 ℃, the vulcanization time is 30 minutes, and the vulcanization pressure is 10Mpa; the rubber is taken out from the flat vulcanizer and then subjected to two-stage vulcanization in an oven at 170°C for 2 hours to obtain vulcanized rubber.

[0032] Table 2 Oilfield high-pressure acid-resistant sealing material formula (2)

[0033] serial number raw material Dosage (serving) 1 Hydrogenated nitrile rubber 75 2 Nitrile rubber 25 3 Zinc oxide 5 4 stearic acid 2 5 Antiager MB 2 6 Carbon black N242 35 7 Carbon black N339 30 8 Fumed silica 18 9 Phenolic Resin 6 10 liquid butadiene rubber ...

Embodiment 3

[0036] After weighing the components according to the formula shown in Table 3, add them to the open mill in turn for mixing until they are uniform, and then release the sheet to obtain the mixed rubber. The mixed rubber is vulcanized for one stage on a flat vulcanizer, and the vulcanization temperature is controlled at 160 ℃, the vulcanization time is 30 minutes, and the vulcanization pressure is 10Mpa; the rubber is taken out from the flat vulcanizer and then subjected to two-stage vulcanization in an oven at 160°C for 2 hours to obtain vulcanized rubber.

[0037]Table 3 Oilfield high-pressure acid-resistant sealing material formula (3)

[0038] serial number raw material Dosage (serving) 1 Hydrogenated nitrile rubber 65 2 Nitrile rubber 35 3 Zinc oxide 7 4 stearic acid 4 5 Antiager MB 1 6 Carbon black N285 30 7 Carbon black N330 25 8 Fumed silica 25 9 Phenolic Resin 10 10 liquid butadiene rubbe...

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Abstract

An oilfield ultrahigh-pressure acid-resistant rubber seal material comprises, by weight, 85-65 parts of hydrogenated butadiene-acrylonitrile rubber, 15-35 parts of butadiene-acrylonitrile rubber, 5-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of an antioxidant, 50-65 parts of nanometer carbon black, 15-25 parts of white carbon black, 5-10 parts of a phenolic resin, 5-10 parts of a softener, 3-6 parts of a peroxide vulcanizing agent, 6-8 parts of a vulcanizing aid, 1-3 parts of sulfur, and 2-4 parts of a promoter, wherein the sum of the weight parts of the hydrogenated butadiene-acrylonitrile rubber and the butadiene-acrylonitrile rubber is 100. A seal ring made through adopting the rubber seal material can satisfy the seal of oilfield high-pressure acid-resistant liquid (hydrochloric acid or hydrofluoric acid) pipelines, and overcomes the leakage and torn edge extrusion phenomena of seal members under a high hydraulic pressure.

Description

technical field [0001] The invention relates to a rubber sealing material, in particular to an oil field ultra-high pressure acid-resistant rubber sealing material. Background technique [0002] With the expansion of oilfield mining to deep rock formations and deep sea areas, in order to increase the original recovery rate, it is necessary to inject high-pressure acid liquid into the formation to impact and corrode the underground rock formation, increase the crude oil dialysis rate and thus increase the production. High-pressure acid needs to be transported through pipelines, and the sealing of pipeline connections is very critical. The liquid pressure in the high-pressure pipeline is between 30 and 140MPa. The seals currently used can seal the hydraulic pipeline below 70MPa and basically meet the requirements for use. However, when used in a hydraulic environment above 100MPa, leakage and product bursting are prone to occur. As the difficulty of oilfield mining increases,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08L9/02C08L61/06C08K13/02C08K3/22C08K5/09C08K3/04C08K3/36C08K5/14C08K3/06C08K5/3415C08K5/3492C08K5/098C09K3/10
Inventor 王兵游艇张明霞肖海燕孙英富韦璇
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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