Double-medium multi-stage expansion packer and clamping and plugging method

Abstract

The invention discloses a double-medium multi-stage expansion packer and a clamping and plugging method. The packer comprises a central pipe and a rubber sleeves which sleeve the outer wall of the central pipe, the rubber sleeves comprise an upper shoulder short rubber sleeve, a middle long rubber sleeve and a lower shoulder short rubber sleeve, the upper end of the middle long rubber sleeve is connected to the upper shoulder part short rubber sleeve through an upper double-medium indirect pressure transmission mechanism, the lower end of the middle long rubber sleeve is connected to the lowershoulder part short rubber sleeve through a lower pressure transmission mechanism, and the upper end of the upper shoulder part short rubber sleeve and the lower end of the lower shoulder part shortrubber sleeve are connected to corresponding longitudinal self-adaptive adjusting mechanisms. The packer and the method have the advantages that the multiple rubber sleeves are flexibly combined so asto meet the longer-section clamping and plugging field requirement, so that the problem of sticking caused by a single long-section rubber sleeve can be solved; the rubber sleeves with different lengths and performances are combined so as to meet the requirements for different clamping and plugging strength; by means of the upper shoulder part longitudinal self-adaptive adjusting mechanism and the lower shoulder part longitudinal self-adaptive adjusting mechanism, the shoulder part stress concentration effect is reduced, and reasonable setting pressure is guaranteed; and by means of the double-medium indirect pressure transmission mechanisms, the problem that a whole pipe column loses efficacy due to the fact that a single rubber sleeve is broken can be solved.

Description

Technical field [0001] The invention relates to the field of oilfield technology development, in particular to a dual-medium multi-stage expansion packer and a clamping method. Background technique [0002] Long-term water injection development of oil reservoirs is prone to form local sudden changes and extreme water consumption zones. In order to reduce ineffective circulation and improve water flooding efficiency, it is necessary to further subdivide the interval and plug. Conventional packers have achieved certain results. However, for wells that do not have stable barriers, small interlayers, or large and thick perforation sections that need to be sealed, conventional packers cannot meet the demand. In recent years, there have been three main problems in the development of the technology of increasing the length of the rubber cylinder of the expandable packer to achieve interlayer sealing: (1) The structure of the rubber cylinder, material, setting pressure difference, proces...

AI Technical Summary

Problems solved by technology

However, for wells without stable interlayers or small interlayers and thick perforation sections that need to be sealed, conventional packers cannot meet the needs

In recent years, the technology of increasing the length of the expandable packer's rubber sleeve to achieve intralayer sealing has been developed. There are three main problems: (1) The structure, material, setting pressure difference of the rubber sleeve, processing difficulty, cost, etc. Restrictions limit the increase of the length of the rubber tube, and the length of the sealing is insufficient, which cannot meet the sealing requirements of the longer section of the layer; (2) The longitudinal size of the rubber tube is large, and once it is torn and damaged, the rubber is easy to accumulate during the lifting process of the inspection and replacement column. (2) Once the rubber cartridge is damaged, the plugging will fail, which will lead to the failure of the entire string, which greatly increases the cost of dispensing

[0003] After searching the packers of the prior art, no packer was found that could solve the following technical problems: (1) It is suitable for the on-site requirements of longer section jamming, avoiding the jamming problem caused by a single long section of rubber tube; (2) Satisfying Different sealing strength requirements; (3) reduce the stress concentration effect of the shoulder and ensure a reasonable setting pressure; (4) avoid the failure of the whole string caused by the rupture of a single rubber tube

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