Rubber sleeve with large-diameter top and bottom ends, packer and bridge plug

Abstract

The invention relates to the field of sealing, in particular to a rubber sleeve with large-diameter top and bottom ends, a packer and a bridge plug. The rubber sleeve, the packer and the bridge plug are capable of bearing high temperature and high pressure and are applicable to oil exploitation industries. The rubber sleeve is coated with graphite layers, and comprises metal wire sealing rings and cellosilk sealing rings; all the metal wire sealing rings are coated with first graphite layers, all the cellosilk sealing rings are coated with second graphite layers, and diameters of hard sealing rings at the upper end and hard sealing rings at the lower end are all larger than those of the metal wire sealing rings and the cellosilk sealing rings. In this way, in the process of sinking the graphite layers to a shaft bottom or delivering the graphite layers, the graphite layers with which the outer side surfaces of the metal wire sealing rings and cellosilk sealing rings are coated can be protected by the hard sealing rings with larger diameters at the upper end and the lower end, and thus the damages to the graphite layers are prevented.

Description

technical field [0001] The present application relates to the field of sealing, in particular to a rubber cylinder with a large diameter at the upper and lower ends, which can withstand high temperature and high pressure, and is used in the oil exploitation industry. Background technique [0002] Packer is a key tool for downhole oil production in oilfields. It is widely used in various operations such as oilfield injection, layered reconstruction, layered oil production, mechanical pipeline water plugging, etc. The packer needs to isolate the annular space to achieve Oil and gas stratification, and the core component to achieve annular isolation is the rubber cartridge. Bridge plug is also a tool for oil and gas stratification commonly used in oil production. The main difference between the packer and the bridge plug is that the packer is generally temporarily left in the well during the construction of fracturing, acidizing, leak-finding and other measures, while the brid...

AI Technical Summary

Problems solved by technology

According to the inventor's test, when the first axial pressure was 30MPa, the inventor found that shoulders would appear in almost all rubber cartridges, and when the second axial pressure (such as 15MPa or 20MPa) was further applied, all the rubber cartridges would Can create splits at the shoulders, causing seal failure

[0008] Furthermore, the inventors have also found that even if the rubber cartridge can be temporarily sealed when the second axial pressure is applied, when bottomhole gas and other substances impact the rubber cartridge, the small molecules of high-temperature and high-pressure steam contained therein will have an impact on the polymer. The rubber sleeve of the material is degraded, causing the rubber sleeve to lose its elasticity at the lower end first and cannot play a sealing role, and then the middle part of the rubber sleeve is also degraded and loses elasticity, which affects the long-term performance of the rubber sleeve seal

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