CMC for water well drilling
- Commodity name: CMC for water well drilling
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Carboxymethyl cellulose (CMC) primarily functions as a filter cake reducer, thickener, and protective agent in water drilling. Its specific functions include:
Filter cake reducer: CMC molecules form a dense filter cake on the wellbore, reducing filtrate permeation into the formation and thus lowering filtrate loss.
Thickener: High-viscosity CMC significantly increases drilling fluid viscosity, improving proppant carrying capacity and wellbore stability.
Protective agent: CMC adsorbs onto the surface of clay particles, forming a stable colloidal structure that prevents particle aggregation and maintains drilling fluid stability.
Other properties: Salt resistance: Suitable for brine drilling fluids, exhibiting good stability and effectively reducing fluid loss even at temperatures exceeding 150°C.
pH adaptability: Performs best in slightly alkaline environments (pH 8-10), requiring no preservatives.
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