Softening treatment device and method for high-temperature oilfield sewage

By combining multi-stage treatment with specialized agents, the problem of cross-precipitation of various types of scale in high-temperature oilfield wastewater is solved, achieving efficient and stable wastewater purification results, and is suitable for softening treatment of high-temperature oilfield wastewater.

CN122166981AInactive Publication Date: 2026-06-09KARAMAY YAOCHENG PETROLEUM TECH CO LTD
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Patent Information

Application Number
CN202610653282.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-06-09
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively identify and differentiate various scaling ions in high-temperature oilfield wastewater treatment, leading to the cross-precipitation of complex scale. Traditional sedimentation processes are inefficient, and conventional reagents are prone to failure, affecting equipment operational stability and water quality.

Method used

It adopts a multi-stage treatment process including a pre-desorption tank, a barium strontium adsorption tank, a silicate pre-removal tank, and a carbonate softening tank. Combined with special agents and a stirring structure, it purifies wastewater step by step by precisely controlling pH value and crystal form, blocking the formation of sulfate scale, and improves sedimentation performance through strong mixing, weak flocculation, and rapid settling functions.

Benefits of technology

It achieves efficient removal of various types of scale from high-temperature oilfield wastewater, avoids cross-precipitation, improves sedimentation rate and effluent clarity, ensures stable system operation, and meets reinjection or boiler feedwater standards.

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Abstract

The invention discloses a softening treatment device and method for high-temperature oilfield sewage, and relates to the technical field of sewage treatment.The oilfield sewage enters a pre-desorption impurity removal tank to be subjected to impurity removal and decontamination, and a fine quartz sand layer, a chelating resin layer and a coarse quartz sand layer are sequentially arranged in a barium-strontium adsorption tank from top to bottom; an acid-base regulator, a dispersing agent and a magnesium oxide suspension are added into the silicate pre-removal tank, a dispersing agent, a coagulant aid, a sodium carbonate solution and a chelating agent are added into the carbonate softening tank, and a modified activated carbon layer and an exchange resin layer are sequentially arranged in the stabilizing tank from top to bottom. Oil, suspended solids and corrosion products are preliminarily separated through the pre-desorption impurity removal tank, barium and strontium ions are selectively adsorbed through special chelating resin, pH is precisely regulated and controlled in the silicate pre-desorption tank, magnesium oxide is added, settleable magnesium silicate flocs are directionally generated, and through coordination of crystal form regulation and control and coagulation aid in the carbonate softening tank, the magnesium silicate flocs in the carbonate softening tank are softened. Calcium and magnesium are promoted to be separated out in a large-particle calcite form.
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