Novel combined compression type packer rubber sleeve

Abstract

The invention provides a novel combined compression type packer rubber sleeve. The novel combined compression type packer rubber sleeve comprises an upper rubber sleeve, a middle rubber sleeve and a lower rubber sleeve, all of which are arranged between a central pipe and a casing pipe. The middle rubber sleeve is a trapezoidal section with the interior narrower than the exterior, the upper end and the lower end of the middle rubber sleeve are symmetrically sleeved with the upper rubber sleeve and the lower rubber sleeve, wedge-shaped slope structures consistent with the two sides of the rubber sleeve in shape are arranged at the contact positions of the upper rubber sleeve and lower rubber sleeve with the middle rubber sleeve, and the ends away from the rubber sleeve are planes. Metal elastic rings are wrapped and vulcanized in the shoulder portions of the upper rubber sleeve and the lower rubber sleeve, the metal elastic rings are of dish-shaped structures, and dish openings face inwards. A special-shaped annular groove is formed in the middle position of the inner side of the middle rubber sleeve and is formed by combining a trapezoid section and a semicircular section, a metalsupporting piece is arranged in the special-shaped annular groove, the section shape of the metal supporting piece is consistent with that of the special-shaped annular groove, a rectangular groove isformed in the supporting piece, and an O-shaped sealing ring is arranged in the rectangular groove in a sleeved manner. The novel combined compression type packer rubber sleeve is compact in structure, scientific and reasonable in design and good in sealing effect, unsealing is easy, and the sealing reliability of the rubber sleeve under high-temperature and high-pressure working conditions can be improved.

Description

technical field [0001] The invention relates to a compression packer for underground high-pressure fracturing in oil production wells, in particular to a novel combined compression packer rubber cartridge. Background technique [0002] With the development of the petroleum industry, the fracturing packer as a stimulation tool for oil wells has been continuously improved and improved. As the core component of the fracturing packer, the rubber cartridge, its sealing failure will lead to early scrapping of oil and gas wells, resulting in huge economic losses. loss. The barrel-shaped packer rubber barrel widely used at present has a simple structure, but its sealing effect is poor under high temperature and high pressure, and it is prone to "shoulder" damage. In order to improve the pressure bearing capacity of the rubber cartridge, some rubber cartridges are designed with a metal anti-shoulder structure on the shoulder, but these metal anti-shoulder structures are not easy to ...

AI Technical Summary

Problems solved by technology

[0002] With the development of the petroleum industry, the fracturing packer as a stimulation tool for oil wells has been continuously improved and improved. As the core component of the fracturing packer, the rubber cartridge, its sealing failure will lead to early scrapping of oil and gas wells, resulting in huge economic losses. loss

Barrel packer rubber barrels widely used at present have a simple structure, but their sealing effect is poor under high temperature and high pressure, and they are prone to "shoulder" damage

In order to improve the pressure bearing capacity of the rubber cartridge, some rubber cartridges are designed with a metal anti-shoulder structure on the shoulder, but these metal anti-shoulder structures are not easy to recover due to their deformation when unsealing, and it is easy to cause difficulty in unsealing; two or three glue The combined structure of the cartridge can improve the sealing effect of the rubber cartridge, but increases the axial length of the packer

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