A liquid sulfonated filtration loss reducer, its preparation method and application

By using a multi-component compounding and stepwise cross-linking process for liquid sulfonated filtration loss reducers, the problems of poor solubility and insufficient synergistic effect in existing technologies have been solved. This achieves a balance between filtration loss reduction effect and rheological properties under high temperature and high salinity conditions, and improves the stability and storage convenience of drilling fluids.

CN122302845APending Publication Date: 2026-06-30CHENGDU XIYOUHUAWEI SCI & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU XIYOUHUAWEI SCI & TECH CO LTD
Filing Date
2026-06-04
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing sulfonated filtration loss reducers have problems such as poor solubility, insufficient synergistic effect, and poor temperature and salt resistance. In particular, their solubility is even worse in high mineralization or low temperature environments, and liquid products are prone to stratification during long-term storage, making it difficult to meet the needs of complex formations.

Method used

The process employs a multi-component compounding and stepwise crosslinking technology using liquid sulfonated filtration loss reducers. Through the combination of sulfonated phenolic resin, sulfonated lignite, sulfonated lignin, and crosslinking agents, a stable three-dimensional network structure is formed. Combined with dispersants to regulate the molecular chain spacing, precise complementarity and synergistic enhancement of each component are achieved.

Benefits of technology

It achieves long-term effectiveness and erosion resistance in reducing filtration loss in high-temperature and high-salt environments, balances rheological properties, and significantly improves product convenience and storage stability, making it suitable for drilling in complex formations.

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Abstract

This invention discloses a liquid sulfonated filtration loss reducer, its preparation method, and its application, belonging to the field of oilfield chemical technology. The filtration loss reducer is a water-based liquid product, comprising, by weight, 30-50 parts sulfonated phenolic resin, 20-40 parts sulfonated lignite, 10-20 parts sulfonated lignin, 2-5 parts crosslinking agent, and 0.5-2 parts dispersant. Its preparation employs a stepwise reaction: first, sulfonated phenolic resin is compounded with sulfonated lignite, then sulfonated lignin is added, followed by the construction of a three-dimensional network structure using a crosslinking agent, and finally, a dispersant is added to regulate fluidity. The prepared filtration loss reducer exhibits excellent filtration loss reduction capacity and rheological properties under high-temperature conditions, and remains a highly fluid liquid after two months at room temperature, demonstrating excellent storage stability. The filtration loss reducer is liquid and can be directly pumped into drilling fluid, making it convenient for field application and suitable for water-based drilling fluid systems in deep wells, salt-gypsum formations, and other complex formations.
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