Oil well separate layer backwashing mechanism, separate layer well washing device and separate layer well washing method

By designing a layered backwashing mechanism for oil wells, and using a dissolving liquid to dissolve the backwashing mechanism and form a jet flush, the problems of packer jamming and backwashing failure caused by complex well conditions and bottom hole blockage were solved, achieving effective cleaning of the layered annulus and stable production of oil wells.

CN121993063BActive Publication Date: 2026-06-23KARAMAY HONGDU
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KARAMAY HONGDU
Filing Date
2026-04-10
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing technologies, packers may become stuck due to complex well conditions during stratified water injection operations, posing a risk of well overhaul or even abandonment. Furthermore, the backwashing function fails when scale accumulates or blocks the bottom of the well, making it impossible to effectively clean the upper tubing.

Method used

A layered backwashing mechanism for oil wells was designed, including a first tubing section, a first backwashing mechanism, a second backwashing mechanism, and a packer. The blockage location is determined by surface flow monitoring, and a dissolving agent is injected to dissolve the backwashing mechanism. The washing fluid enters the pipe through the inlet and forms a jet, which is sprayed into the annulus below for powerful flushing, thus preventing the backwashing function from failing due to blockage at the bottom of the packer.

Benefits of technology

It enables targeted and effective cleaning of each layer of the annulus, reduces the risk of well overhaul and abandonment, and ensures the continuity of layered water injection operations and the long-term production stability of the well.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses an oil well layering backwashing well mechanism, a layering well washing device and a layering well washing method, relates to the technical field of oil exploitation equipment, and through the arrangement of a first oil pipe section, a first backwashing mechanism, a second backwashing mechanism and a packer, when the casing and the oil pipe annulus are blocked due to the entry of sand, the position of the blockage can be determined by ground flow monitoring, and then the first backwashing mechanism and the second backwashing mechanism are sequentially dissolved by injecting a dissolving solution. The well washing fluid enters the pipe through the open first liquid inlet, is then shunted to the nozzle to form a jet, the jet enters the packer backwashing small channel and is sprayed to the lower annulus, powerful flushing of the water scale and sand blockage is implemented, the problem that the backwashing function of a conventional packer is completely lost due to lower blockage is avoided, the pipe string is prevented from being stuck, the risk of oil well overhaul and even scrapping is reduced, and targeted and effective cleaning of the annulus of each layer is realized.
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