Rubber barrel with harder upper end part as well as packer and bridge plug

Abstract

The invention relates to the field of sealing, and particularly relates to a rubber barrel with harder upper end part which is used in an oil exploitation industry and can bear a high temperature and a high pressure a packer and a bridge plug. According to one aspect of the invention, the rubber barrel is provided, wherein the hardness of the upper end part of the rubber barrel is more than the hardness of the middle part of the rubber barrel, so that the shape change of the middle part in the radial direction is more than the shape change of the upper end part in the radial direction when the upper end part bears first axial pressure. The hardness of the upper end part is more than the hardness of the middle part, in this way, when the upper end part bears the first axial pressure, the upper end part tends to transfer the first axial pressure to the middle part and a lower end part rather than uses the first axial pressure for self radial deformation. Thus, the middle part and the lower end part can be enabled to generate radial deformation when a smaller first axial pressure is used, so as to achieve the integral sealing of the rubber barrel.

Description

technical field [0001] The invention relates to the field of sealing, in particular to a rubber cylinder, a packer and a bridge plug with a relatively hard upper end that can withstand high temperature and high pressure and are 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 bridg...

AI Technical Summary

Problems solved by technology

According to the inventor's test, when the axial working pressure was 30MPa, the inventor found that shoulders would appear in almost all rubber cylinders, and when the second axial pressure (such as 15Ma) from bottom to top was further applied, all The upper rubber cylinder will be split at the shoulder, resulting in seal failure

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