Rubber composition for manufacturing high temperature-resistant compression type packer tubling

Abstract

The invention relates rubber composition used for high-temperature compression packer, comprising the following characteristics: using the hydrogenated nitrile rubber as main material, the organic peroxide as cross linking agent, the hard black and soft black as enhancing filler, the polyfunctional monomer as cross-linking active agent. The money viscosity of the composition is below 180, the hardness of the composition is above shore A90, and the production can be used in oil well at 150Deg.C.

Description

technical field [0001] The invention relates to rubber fittings for petroleum equipment, in particular to a rubber composition used for manufacturing high-temperature resistant compression packer rubber sleeves for oil and gas fields. Background technique [0002] Compression (YS) packer for oil and gas fields is one of the important equipment in oil and gas field exploitation. It is used to perform multi-layer separation and sealing in the oil well casing after the drilling operation is completed, so as to facilitate the layered production, testing and water injection of oil and gas fields. , acidizing and fracturing operations. Obviously. At this time, the key component for the packer to produce a sealing function is the rubber tube made of rubber material. Under the action of pressure, the length becomes smaller under pressure, and the outer diameter expands outward, thereby sealing the casing. Using two packers, a section of the oil well sandwiched between them can be ...

AI Technical Summary

Problems solved by technology

At present, this kind of packer rubber cartridges are all made of nitrile rubber. In order to achieve the required high hardness, it is generally necessary to add a large amount of hard carbon black reinforcing agent to the rubber compound. The dosage is mostly 100% of rubber. The weight part is about 120 parts by weight. At this time, the rubber compound will become very stiff and the processing performance is very poor. Usually, it is necessary to add an appropriate amount of liquid nitrile rubber as a plasticizer-softener

However, with the development of oil and gas field exploitation technology, the exploitation depth of oil and gas wells continues to increase, and the temperature in oil and gas wells is also getting higher and higher. In addition, the sulfur content in domestic oil well crude oil is relatively high. In view of these factors, the original nitrile rubber used It can no longer meet the needs of some oil and gas field exploitation operations, because the temperature resistance limit of nitrile rubber is 120 ° C, and it is also not resistant to hydrogen sulfide corrosion

[0003] In the mid-1980s, Bayer Company of Germany and Zeon Company of Japan successfully developed a new type of nitrile rubber with low unsaturation by hydrogenating the unsaturated components in nitrile rubber, which is called hydrogenated nitrile rubber (HNBR). HNBR), due to its low degree of unsaturation, aging resistance, high temperature resistance, and medium resistance are significantly improved, and the temperature resistance can reach 150 ° C. It also has good resistance to hydrogen sulfide. For nitrile rubber, as its acrylonitrile content increases, its oil resistance improves; as the degree of hydrogenation increases, its aging resistance increases, and its compression set increases. In general, its process performance, especially its The Mooney viscosity of the rubber material is relatively high, and the fluidity is relatively poor. In addition, it is used for high temperature resistance, and it cannot be plasticized with liquid nitrile rubber that is not resistant to high temperature. Therefore, if the original traditional compounding method is still used, it can be added A large amount of hard carbon black reinforcing fillers will encounter many problems in the manufacture of rubber cartridges for packers. First, the process performance of the rubber material is very poor, and the Mooney viscosity is as high as 200 or more. The calorific value is very large, and the temperature of the roller of the rubber mixing machine may rise sharply to 80-90°C during rubber mixing, which will easily cause the rubber material to burn on the roller; Apply a large injection pressure (maybe above 1000kN) to the rubber material, and it takes a long injection time to make the rubber material fill the mold cavity; moreover, the surface of the vulcanized product will remain on the surface of the rubber material from the pressure injection. The small hidden marks (texture) formed by the insufficient fusion of the rubber strips flowing out of the runner will affect the appearance quality of the product