Spiral packer rubber barrel with steel skeleton

Abstract

The invention relates to a packer rubber barrel, in particular to a spiral packer rubber barrel with a steel skeleton. The rubber barrel comprises a rubber barrel body; the rubber barrel body is of a cylinder shape; a spiral thread is formed on the rubber barrel body; a spiral spring is coated in the spiral thread of the rubber barrel body. The rubber barrel is simple in structure and high in practicality; by the spiral spring coated in the rubber barrel body, an axial pressure can be uniformly transferred to the rubber barrel body under the action of a pressure; moreover, axial deflection of the spiral spring is consistent with that of the rubber barrel body, so that the rubber barrel body is uniformly stressed and bending and deformation of the middle position of the rubber barrel body are avoided, thereby increasing a contact length of the rubber barrel body and a well wall, increasing a sealing area and improving stability; the phenomenon of shoulder protrusion is reduced. Meanwhile, the spiral spring stores energy when being compressed, and when the rubber barrel is unsealed, the spiral spring releases energy to enable the rubber barrel to be rapidly recovered to the original state.

Description

technical field [0001] The invention relates to a packer rubber cartridge, in particular to a spiral packer rubber cartridge with a steel skeleton. Background technique [0002] Packer is an essential tool in downhole oil recovery technology, and has been widely used in well completion, water injection, fracturing, acidizing and other operations. The packer uses elastic sealing elements to isolate the annular space between the pipe string and the well wall and between the pipe string and the pipe string to isolate the well fluid and pressure, thereby controlling the production of liquid or injecting liquid and protecting the casing. Its key component is the elastic rubber sleeve with sealing performance, and the sealing performance of the rubber sleeve directly affects the sealing effect of the packer. [0003] Common packer rubber cartridges include single rubber cartridges or multiple rubber cartridges combined with multiple single rubber cartridges. When using a single ...

AI Technical Summary

Problems solved by technology

[0004] When using multiple rubber sleeves, the effective sealing area of ​​the rubber sleeves will increase during the downhole setting of the packer, but the axial compression force will be reduced due to the transmission of the axial compression force through the spacer ring, and all the rubber sleeves will be in contact with the well wall or Different contact stresses are generated between the casings, resulting in uneven stress on the upper and lower rubber sleeves and sudden changes, so that the rubber sleeves cannot fully contact with the well wall, thus affecting the sealing performance

If the setting load on the rubber cylinder is increased, the contact stress and contact length between the middle rubber cylinder and the lower rubber cylinder can be increased, but the upper rubber cylinder will produce a large shoulder protrusion under the action of friction, and excessive friction The force will cause the rubber tube to be torn by the well wall, thus making the rubber tube lose its sealing performance

The rubber tube subjected to the maximum contact pressure will have a "shoulder protrusion" phenomenon, resulting in a large stress concentration. When the stress reaches the rubber tube's failure limit stress, the rubber tube will crack, and the crack will continue to expand under the external pressure, and finally Tearing the rubber cartridge, causing the rubber cartridge to fail

There are various deficiencies in the existing commonly used rubber cartridges, which cannot achieve a good and effective seal

Images