Reducing fluid loss in a drilling fluid

   
   

This invention relates to a low toxicity drilling mud oil. In some embodiments, the fluid loss characteristic of the drilling mud oil as used in a borehole can be reduced to less than 0.2 ml/30 minutes by adding about 0.05% to about 2.0% by weight of a butadiene-styrene-butadiene (BSB) block copolymer having about 20% by weight or more styrene.

Questa invenzione riguarda un olio basso del fango perforante di tossicità. In alcuni incorporamenti, la perdita fluida caratteristica dell'olio del fango perforante come usato in un pozzo trivellato può essere ridotta a più meno di 0.2 resoconti ml/30 aggiungendo circa 0.05% a circa 2.0% del peso di un copolimero del blocchetto del butadiene-stirolo-butadiene (BSB) che ha circa 20% di peso o più stirolo.

 
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