52 CHEMICAL REAGENT FOR CLEANING AND FOR REMOVING FROM A WELL OR FROM AN OIL-OR GAS-BEARING FORMATION IN A WELL MUD-LIKE SHEATHING OR COATING ON THE WELL WALL RESULTING FROM THE USE OF DRILLING FLUIDS IN THE DRILLING OPERATION, OR RESULTING FROM THE PRESENCE IN THE WELL, AT SOME OTHER TIME, OF FLUIDS CAPABLE OF PRODUCING SUCH SHEATHING OR COATING AND FOR PENETRATING THE FORMATION TO FACILITATE THE RETURN OF WATER TO THE HOLE WHETHER DERIVED FROM DRILLING MUD, COGNATE WATERS, OR ANY OTHER SOURCE
Trademark: 71575423
