Combination clean-out and drilling tool

Details Combination clean-out and drilling tool Combination clean-out and drilling tool

E - Fixed Constructions

21

B

255/12

E21B 4/00 (2006.01) E21B 21/00 (2006.01) E21B 21/10 (2006.01) E21B 27/00 (2006.01) E21B 37/00 (2006.01)

Patent

CA 1183517

34 COMBINATION CLEAN-OUT AND DRILLING TOOL ABSTRACT A tool (10) is disclosed which permits clean-out of a bore hole in either a hydrostatic or hydraulic operation. In addition, the tool (10) may be used to drill a formation within the bore hole without the need for circulation of fluid to the surface to remove cuttings from the formation. The tool (10) includes an upper assembly (12) and a lower assembly (14). The upper assembly (12) is secured to a drill or tubing string assembly (16) extending to the surface. The lower assembly (14) includes a debris chamber (144) and a trap valve (148) for permitting one-way flow of debris and fluid therein. In hydrostatic operation, a lower valve assembly (126) is provided to prevent fluid entry into the spaces above the assembly in the tool and drill or tubing string assembly until the tool reaches the debris in the bore hole. Downward motion of a seal, guide and swab piston assembly (102) opens the valve assembly to drive the debris and fluid into the debris chamber. In hydraulic operation, the lower valve assembly (126) is removed and an upper valve assembly (40) is positioned within the upper assembly. Reciprocation of the seal, guide and swab piston assembly (102) drives debris and fluid into the debris chamber on the upstroke. On the downward stroke of the piston assembly, pressure is relieved through the upper valve assembly and discharged to the bore hole through discharge and relief valves (132, 134). The piston assembly (102) also provides a jet discharge through ports (112) opening into the bore hole to agitate the fluid and debris for enhanced collection. A jet port subassembly (158) is positionable on the lower assembly to perform the function of agitating, lifting and moisturizing debris in the subassembly. The piston assembly (102) may be jarred against the upper barrel nut (96) on the lower assembly to jar the lower assembly free if desired.

423696

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