A packer sealing judgment chart, its use method and application

By designing a packer sealing performance assessment chart and using injection pressure and dynamic data to determine the packer status, the problem of interlayer interference caused by packer failure was solved, and the development effect of Class III oil reservoirs was improved.

CN122169780APending Publication Date: 2026-06-09DAQING OILFIELD CO LTD +1
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DAQING OILFIELD CO LTD
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies, packers fail downhole due to pressure differences and the influence of oil, gas and water, resulting in poor development of the three types of oil reservoirs. Furthermore, there is a lack of effective failure determination methods, which affects the development effect and dynamic analysis of the three types of oil reservoirs.

Method used

A packer sealing performance assessment chart was designed for injection and production wells. The chart area was divided into rectangular areas based on changes in injection pressure, the increase in apparent fluid absorption index, the change in water cut, and the increase in production index. The effectiveness of the packer was assessed, and timely removal or resealing of the packer was performed.

Benefits of technology

It enables rapid and accurate assessment of packers, reduces interlayer interference caused by failure, and improves the development effect of Class III oil reservoirs and the success rate of well plugging.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122169780A_ABST
    Figure CN122169780A_ABST
Patent Text Reader

Abstract

This disclosure relates to a packer sealing performance assessment diagram, its usage method, and its application. When developing Class III oil layers by plugging Class I oil layers, the packer in the injection well is assessed for failure based on changes in injection pressure and the apparent increase in the fluid absorption index. Similarly, the packer in the production well is assessed for failure based on changes in water cut and the increase in the production index. This allows for rapid and accurate assessment of whether either the injection or production well packer has failed. Packers in the failure zone can then be promptly unplugged and re-plugged, ensuring the sealing effectiveness of the packers and reducing inter-layer interference caused by packer failure, thus minimizing the impact on the development of Class III oil layers. This effectively solves the problem of lacking applicable technology for assessing the sealing performance of reusable packers in Class I oil layers.
Need to check novelty before this filing date? Find Prior Art