Combination retrievable drilling fluid filter and wiper

A drill collar based retrievable drilling fluid filter and drill string wiper tool for subterranean drilling operations, comprising;

• a) a filter collar section and a wire line retrievable filter and wiper unit, the filter collar includes threaded ends dimensioned for inclusion of the filter collar within a drill string, a centering bore for concentrically receiving the filter and wiper unit, an annular drilling fluid passageway extending a length of the filter collar, a collar elongated erosion section with a plurality of interruptions positioned longitudinally on an interior surface of the filter collar and extending into the annular drilling fluid passageway, and a wiper brush receiving area positioned between the elongated erosion section and centering bore,
• b) the filter and wiper unit include a filter insert and an elongated wiper carrier,
• c) the elongated wiper carrier includes a lower centering post which is received by the filter collar centering bore for aligning and centering the filter and wiper unit, a wiper brush section above the centering post which includes a plurality of round wiper brushes evenly spaced and concentrically mounted thereto, and an upper elongated receiving rod for receiving the filter insert,
• d) the filter insert includes a wire line connector at a top end for retrieving the filter and wiper unit, a filter insert elongated erosion section positioned at an upper end of the filter insert and coinciding with a longitudinal length of the collar elongated erosion with a plurality of longitudinally positioned splines extending from the filter insert erosion section and extending into the annular drilling fluid passageway while a combination and alignment of the splines and interruptions extend into and fragment the annular drilling fluid passageway to form numerous smaller drilling fluid passageways where the number of interruptions and splines are dimensioned and aligned so that the number of fragmented annular drilling fluid passageways becomes progressively more numerous and smaller from an upper end of the erosion sections to a lower end of the erosion sections, a central bore extending centrally and longitudinally through the filter insert for slidingly receiving the upper elongated receiving rod from the wiper carrier while the receiving rod and central bore include a key captured within a key way for aligned and limited longitudinal movement of the filter insert on the elongated wiper carrier from an operational position to a retrieval position, a wiper brush receiving cylinder threadingly secured to a lower end of the filter insert erosion section for internally receiving the plurality of wiper brushes.