A rubber cartridge assembly for a packer

Abstract

The invention discloses a rubber cartridge assembly for a packer, comprising a rubber cartridge body, the rubber cartridge body is axially sleeved on a central pipe string of a packer, and the central pipe string at the upper end of the rubber cylinder body is sleeved on There is an upper rubber cylinder seat, and a lower rubber cylinder seat is set on the central pipe column at the lower end; the upper end of the rubber cylinder body is fitted with an upper protective bowl with the bowl mouth facing down, and the bowl-shaped contour of the upper protective bowl matches the rubber cylinder The upper end of the rubber cylinder body is matched with the upper rubber cylinder seat on the central column through the upper protective bowl; The bowl-shaped profile of the bowl matches the lower end profile of the rubber cylinder body, and the lower end of the rubber cylinder body corresponds to the lower rubber cylinder seat on the central pipe column through the lower protection bowl. The invention can realize the long-term service of the rubber cylinder body, ensure the high sealing performance of the setting seal, can withstand higher ambient temperature and pressure, and can adapt to the mining requirements of various well conditions including deep wells and ultra-deep wells.

Description

technical field [0001] The invention relates to a packer used in oil and gas well development, in particular to a rubber cartridge assembly for the packer. Background technique [0002] As an important downhole tool used in oil and gas well development, the packer is used to isolate the annular space between the central pipe string and the wellbore, and between the pipe string, so as to isolate the production layer and realize the control of production (injection) fluid. The packer is mainly composed of a central pipe string, a rubber sleeve assembly and a slip assembly set on the central pipe string, etc. During construction, the rubber sleeve assembly of the packer is responsible for setting the corresponding annular space in the well. The reliability of setting seals directly affects the development of subsequent oil and gas extraction construction operations. It can be seen that the rubber cartridge assembly is one of the important core components of the packer. [000...

AI Technical Summary

Problems solved by technology

[0004] However, since the upper end and the lower end of the above-mentioned rubber cartridge assembly respectively form a direct contact extrusion fit with the corresponding rubber cartridge seat, when the rubber cartridge assembly is force-set and sealed, it will make the rubber cartridge assembly The upper end of the upper section of the rubber cylinder body and the lower end of the lower section of the rubber cylinder body cooperate with the contact parts of the corresponding rubber cylinder seat to generate a large stress concentration respectively. As the annular pressure of the rubber cylinder assembly increases, the upper section of the rubber cylinder assembly The upper end of the rubber cylinder body and the lower end of the lower section of the rubber cylinder body will form axial and radial expansion deformation respectively at the outer annular space of the corresponding rubber cylinder seat. This is especially true in the working conditions of deep wells and ultra-deep wells. Obviously (this is because the rubber cartridge assembly bears a relatively large ambient temperature and environmental pressure), in this way, it will intensify the gap between the upper end of the upper rubber cylinder body and the lower end of the lower rubber cylinder body of the rubber cartridge assembly and the corresponding rubber cartridge seat. The shoulder structure of the contact part is damaged, which damages the integrity of the upper and lower rubber barrels of the rubber cartridge assembly, and loses the sealing effect on the downhole annulus, resulting in the failure of the setting of the packer

In addition, due to the spacer ring cooperation structure between the upper rubber barrel body and the lower rubber barrel body of the above-mentioned rubber cartridge assembly, when the rubber cartridge assembly is forced to set, there will be a certain vacuum position at the spacer ring, which will Reducing the setting contact area of ​​the rubber cartridge assembly in the annulus will also affect the setting and sealing performance of the rubber cartridge assembly in the downhole annulus as the annular pressure on the rubber cartridge assembly increases

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