Methods and apparatus for drilling directional wells by percussion method

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction, and wherein an inner surface of the drive shaft and an outer surface of the cutting assembly include a splined engagement or a rolling key engagement.

A method of forming a wellbore, comprising:

• positioning a drilling tool in the wellbore using a work string, the drilling tool comprising a housing, a piston, a clutch assembly, and a drill head;
• reciprocating the piston axially within the housing by alternately directing pressurized fluid to an upper chamber above the piston and a lower chamber below the piston;
• rotating the piston relative to the housing using the clutch assembly, wherein an inner surface of the clutch assembly and an outer surface of the piston form a splined engagement or a rolling key engagement to facilitate rotation between the clutch assembly and the piston;
• rotating the drill head relative to the housing and to the piston;
• and
• applying an impact force to the drill head to form the wellbore.

A drilling tool assembly, comprising:

• a housing;
• a piston disposed in the housing;
• a clutch assembly coupled to the housing and the piston, wherein the clutch assembly is configured to facilitate rotation of the piston relative to the housing, and wherein the clutch assembly includes a clutch, a clutch sleeve, and one or more dogs configured to engage an outer surface of the clutch to prevent rotation of the clutch in one direction while allowing rotation in a reverse direction;
• and
• a cutting assembly coupled to the piston, wherein the cutting assembly is rotatable relative to the piston.

A drilling tool assembly, comprising:

• a housing;
• a piston disposed in the housing, wherein the piston includes an upper portion with a first set of helical grooves, and a lower portion with a second set of helical grooves, and wherein the first and second sets of helical grooves are arranged in opposite directions or the same direction;
• a clutch assembly coupled to the housing and the piston, wherein the clutch assembly is configured to facilitate rotation of the piston relative to the housing;
• and
• a cutting assembly coupled to the piston, wherein the cutting assembly is rotatable relative to the piston.

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction, and wherein the clutch assembly is prevented from rotating in one direction relative to the housing, thereby forcing rotation of the piston in a reverse direction as the piston moves in the first direction;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction.

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing, wherein the piston includes an upper section with one or more helical grooves, and a lower section with one or more helical grooves, and wherein the helical grooves on the upper section are formed in an opposite direction or the same direction relative to the helical grooves on the lower section;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction.

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction, and wherein clutch assembly includes a clutch sleeve, a clutch, and one or more dogs disposed in one or more slots of the clutch sleeve;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction.

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction, and wherein the clutch assembly includes a clutch and one or more wedge members disposed in one or more slots formed on an outer surface of the clutch;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction.

A drilling tool assembly, comprising:

• a housing;
• a piston axially movable within the housing;
• a clutch assembly disposed between the housing and the piston, wherein the clutch assembly forces rotation of the piston relative to the housing while the piston moves axially within the housing in a first direction;
• a drive shaft coupled to the piston;
• and
• a cutting assembly coupled to the drive shaft, wherein the cutting assembly rotates relative to the piston as the piston moves in the first direction, and wherein an inner surface of the drive shaft or an outer surface of the piston include helical grooves configured to rotate the cutting assembly relative to the piston.