Expansion type water injection packer with shoulder pad sleeve on upper part of rubber barrel

Abstract

The invention discloses an expansion type water injection packer with a shoulder pad sleeve on upper part of a rubber barrel. The water injection packer comprises a central tube and a rubber barrel assembly sleeved on the outer wall of the central tube, a radially penetrating pressure transmission hole is formed in the central tube, the rubber barrel assembly comprises an upper rubber barrel section, a middle rubber barrel section and a lower rubber barrel section, wherein the outer diameter of the middle rubber barrel section is larger than the outer diameter of the upper rubber barrel section, meanwhile, the outer diameter of the middle rubber barrel section is larger than the outer diameter of the lower rubber barrel section, an upper shoulder platform is formed at the joint of the middle rubber barrel section and the upper rubber barrel section, a lower shoulder platform is formed at the joint of the middle rubber barrel section and the lower rubber barrel section, the shoulder padsleeve is sleeved on the outer wall of the upper rubber barrel section, and the lower end of the shoulder pad sleeve resists on the upper shoulder platform. According to the invention, the shoulder protection of the rubber barrel is increased; when the expansion type packer is sealed, the shoulder pad sleeve can be driven to expand, so that the stress concentration on the shoulder of the rubber barrel is reduced, the service life of the packer can be prolonged, and the benefits of oil field layered water injection and oil extraction are increased.

Description

technical field [0001] The invention relates to a tool for layered water injection in an oil field, in particular to an expansion type water injection packer with a shoulder sleeve on the upper part of a rubber cylinder. Background technique [0002] With the continuous development of my country's oilfields, the eastern oilfields have entered the stage of water injection development. Due to the large number of strata, most of the water injection wells are multi-stage layered water injection. In order to achieve the purpose of staged water injection, expansion water injection packers are commonly used in oilfields to separate water injection layers. When water is injected, when the pressure inside the rubber tube is higher than the external pressure of the rubber tube, the rubber tube expands outwards and fits the casing to achieve the purpose of sealing the annular space of the oil casing. [0003] However, the expansion water injection packer has the problem that the shoul...

AI Technical Summary

Problems solved by technology

[0008] Application number: 201410688087.6, open date 2015-03-04 Provides a composite spring shoulder protector compression packer rubber cartridge with spacer ring, application number: 201510269127.8, open date 2015-09-16 Provides a spring shoulder protector For high-temperature and high-pressure expansion packer rubber cartridges, composite springs are embedded in the shoulders of the two packers. Compression packers compress the shoulders when the rubber cartridge is set, and the composite springs are easily deformed and lose their original strength due to extrusion. Elasticity doesn't work as it should

Secondly, the compound spring is embedded in the upper end face of the shoulder guard, and part of the compound spring is exposed. For example, when the distance between the rubber cartridge seat and the sleeve is large, the compound spring and part of the shoulder guard are deformed and squeezed to the end of the rubber cartridge seat. On the outer circle, when the rubber tube is retracted, the pulling force of the compound spring retracts acts on the rubber tube seat instead of the shoulder guard, which will hinder the retraction of the rubber tube in severe cases

Images