Environmentally and technically suitable salt rock goaf abandoning method and system

By sequentially filling demolition waste of different particle sizes to form a structural framework in heterogeneous salt structures and salt rock goafs near geological faults and then sealing it with pressurized cement, the leakage and pollution problems caused by improper filling and sealing in existing technologies have been solved, achieving efficient and economical waste disposal.

CN121941829APending Publication Date: 2026-04-28PETROLEO BRASILEIRO SA PETROBRAS
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Patent Information

Application Number
CN202480062689.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-10-13
Filing Date
2024-10-10
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

Existing technologies are difficult to effectively fill, seal, and dispose of in heterogeneous salt structures and/or near geological faults or in salt rock goafs where the top has collapsed, leading to risks of fluid leakage, ground subsidence, and environmental pollution, and failing to maximize the recycling value of demolition waste.

Method used

A sequential filling method is adopted, in which recycled demolition waste (C&D waste) of different particle sizes is gradually filled into the goaf to form a structural framework. After that, the well is pressurized and sealed with cement to ensure efficient filling and sealing and reduce the risk of leakage.

Benefits of technology

It achieves efficient filling and sealing, reduces disposal costs, reduces greenhouse gas emissions, promotes environmentally friendly waste disposal, and avoids land subsidence and pollution.

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Abstract

The invention relates to the field of application of methods and systems for filling, sealing and discarded (abandoned) salt rocks, in particular goaf located in a heterogeneous salt structure (in which a porous / permeable formation is present), or a goaf close to a geological fault, or even a goaf experiencing collapse at the top of the goaf, or in particular a goaf in a non-homogeneous salt structure (in which a porous / permeable formation is present), or even a goaf undergoing collapse at the bottom of the goaf. These can be performed simultaneously with and integrated with the disposal of field facilities. More specifically, the invention is used for the disposal of civil engineering structures in rock salt production and / or storage sites by applying a dissolution mining process, where the goaf needs to be filled by filling solid material, where the recovered solid material is produced by comminuting demolition waste from the disposal civil engineering structures (in-situ) or other areas of the project facility, and where the solid material is recovered from the disposal civil engineering structures (in-situ) or other areas of the project facility. Through its on-site or off-site mobile recovery device (grinding / comminution / screening), larger particle size waste (gravel) is added to the bottom of the SRC, while smaller particle size waste (sand) is added at the end of SRC filling to block voids and faults.
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