Environment-friendly high-temperature-resistant salt-resistant weathered-coal anti-collapse agent for drilling

The invention relates to an environment-friendly high-temperature-resistant salt-resistant weathered-coal anti-collapse agent for drilling. The agent is prepared through the following steps: superfine grinding, in-situ catalytic oxidation, liquid-solid separation, sulfonation reaction, alkylation reaction and graft copolymerization resinification reaction. The quality inspection results of formed drilling mud weathered coal resin conforms to the standards, issued by Ministry, for high-temperature-resistant salt-resistant anti-collapse agents for drilling; and the use amount of bentonite in application of the anti-collapse agent for drilling can be reduced, the molecular weight in a weathered coal structure is adjusted, and the agent has an excellent anti-collapse function during drilling. 一种环保型的抗高温抗盐风化煤钻井防塌剂，其制备步骤为：超细粉碎、原位催化氧化、液固分离、经磺化反应、烷基化反应、以及接枝共聚树脂化反应，形成的钻井泥浆风化煤树脂质量检验符合部颁标准的抗高温抗盐的钻井防塌剂,可减少钻井防塌剂应用中的膨润土的用量，调整风化煤结构中的分子量，具有优良的钻井防塌功能。