... structure, prevent collapse of wall of a well . 5, can improve mud-making volum, reduce filteration loss ... Test ProcedureViscosity600rpm, Fann 35 in seawater/KClFiltrate Loss, ml Filtrate volume, in seawater/KClMoisture Content,% Particle ... 99%Min.through 30meshPAC-LChevron method14.0max.24.5 ml max. 9.0 max.99%Min.through ... 20≤20≤40≤30≥35≥50≥60Filtrate Loss, ml≤16≤13≤12≤11 ≤26≤18Test StandardAPI ...