Geothermal reinjection plugging method and device

By combining hydraulic jetting segmented unblocking tubing with nitrogen drainage, the problem of blockage in medium-low permeability sandstone thermal reservoirs was solved, the reinjection rate and permeability were improved, and the service life of geothermal reinjection wells was extended.

CN122148248APending Publication Date: 2026-06-05PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2024-12-05
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Low-to-medium permeability sandstone geothermal reservoirs are prone to blockage during geothermal reinjection, resulting in low reinjection rates and a tendency for reinjection volume to decrease over long-term operation. Existing unblocking methods are inefficient.

Method used

The method employs a combination of hydraulic jetting and nitrogen drainage to clean the production section and screen section of the geothermal reinjection well from bottom to top, and uses nitrogen to create negative pressure to expel the blockage.

Benefits of technology

It effectively removes blockages in the near-wellbore area of ​​geothermal reinjection wells, improves permeability and reinjection volume, extends the lifespan of geothermal reinjection wells, and ensures the sustainable use of geothermal resources.

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Abstract

The application discloses a geothermal reinjection plugging removal method and device, relates to the technical field of low-pressure geothermal reinjection plugging removal of middle-low permeability thermal reservoirs, and comprises the following steps: collecting reservoir plugging of a geothermal reinjection well to be unblocked, and analyzing the composition of the reservoir plugging; configuring a target plugging removal fluid based on the composition of the reservoir plugging; sequentially performing self-down-to-up segmented cleaning on all production layer sections and all production layer screen pipe sections of the geothermal reinjection well to be unblocked by the target plugging removal fluid based on a hydraulic jetting segmented plugging removal pipe column, until the reservoir plugging is completely cleaned; and removing the cleaned reservoir plugging from the geothermal reinjection well to be unblocked by a nitrogen gas liquid discharge method. The application adopts the plugging removal mode of the combination of the hydraulic jetting segmented plugging removal pipe column and the nitrogen gas liquid discharge method, achieves the purpose of uniformly improving the permeability of a near-wellbore zone, improving reinjection capacity, and guaranteeing subsequent reinjection effect, and thus realizes the problem of efficiently solving the middle-low permeability low-pressure reinjection plugging in a targeted manner.
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