Assertion: mud | /r/CapableOf | form a filter-cake
Facets:
value: to prevent drilling fluid invasion
type: PURPOSE
value: on the borehole wall
type: LOCATION
Source sentences:
text: It provides hydrostatic pressure on the borehole wall to prevent uncontrolled production of reservoir fluids, lubricates and cools the drill bit, carries the drill cuttings up to the surface, forms a "filter-cake" on the borehole wall to prevent drilling fluid invasion, provides an information medium for well logging, and helps the drilling by fracturing the rock from the jets in the bit.