The present invention relates to a drilling fluid additive, the drilling fluid additive comprising a blend of cellulosic fibres, wherein the particle size distribution of the blend of cellulosic fibres is such that between 40% and 60% of the cellulosic fibres have a particle size of less than 75 microns.
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[Class : 1] Fluids For Drilling Including Drilling Muds, Including Drilling Mud For Oil, Gas And Geothermal Steam For Use In Industry; Chemical Additives For Drilling Fluids, Including Chemical Additives For Drilling Muds; Cellulose, Including Cellulose Derivatives, Cellulose For Industrial Purposes And Cellulose Pulp.
[Class : 1] Fluids For Drilling Including Drilling Muds, Including Drilling Mud For Oil, Gas And Geothermal Steam For Use In Industry, Chemical Additives For Drilling Fluids, Including, Chemical Additives For Drilling Muds, Cellulose, Including Cellulose Derivatives, Cellulose For Industrial Purposes And Cellulose Pulp