Abstract

A bottom hole assembly (BHA) and method for drilling a bore with a pneumatic percussion hammer includes an expandable packer surrounding the stem rod connected to the hammer. The packer has an inner surface confronting the outer surface of the stem rod in an axially slideable, sealed relationship. The packer is expanded and fixed in the bore to separate a region of high hydraulic pressure above the packer from a region of lower hydraulic pressure below the packer. The method includes operating the pneumatic hammer and bit, while (i) the stem rod advances with a sliding seal against an inside surface of the expanded packer; (ii) pneumatic pressurization and exhaust for the hammer are guided within the stem rod; and (iii) the exhaust from the hammer is discharged into the lower clearance region surrounding the bit at the bottom of the bore.

IPC Classes  ?

• E21B 21/12 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
• E21B 33/12 - PackersPlugs
• E21B 4/14 - Fluid operated hammers
• E21B 17/18 - Pipes provided with plural fluid passages
• E21B 17/20 - Flexible or articulated drilling pipes

Abstract

A bottom hole assembly (BHA) and method for drilling a bore with a pneumatic percussion hammer includes an expandable packer surrounding the stem rod connected to the hammer. The packer has an inner surface confronting the outer surface of the stem rod in an axially slideable, sealed relationship. The packer is expanded and fixed in the bore to separate a region of high hydraulic pressure above the packer from a region of lower hydraulic pressure below the packer. The method includes operating the pneumatic hammer and bit, while (i) the stem rod advances with a sliding seal against an inside surface of the expanded packer; (ii) pneumatic pressurization and exhaust for the hammer are guided within the stem rod; and (iii) the exhaust from the hammer is discharged into the lower clearance region surrounding the bit at the bottom of the bore.

IPC Classes  ?

• E21B 4/14 - Fluid operated hammers
• E21B 17/18 - Pipes provided with plural fluid passages
• E21B 17/20 - Flexible or articulated drilling pipes
• E21B 21/12 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
• E21B 33/12 - PackersPlugs

Abstract

A bottom hole assembly (BHA) and method for drilling a bore with a pneumatic percussion hammer includes an expandable packer surrounding the stem rod connected to the hammer. The packer has an inner surface confronting the outer surface of the stem rod in an axially slideable, sealed relationship. The packer is expanded and fixed in the bore to separate a region of high hydraulic pressure above the packer from a region of lower hydraulic pressure below the packer. The method includes operating the pneumatic hammer and bit, while (i) the stem rod advances with a sliding seal against an inside surface of the expanded packer; (ii) pneumatic pressurization and exhaust for the hammer are guided within the stem rod; and (iii) the exhaust from the hammer is discharged into the lower clearance region surrounding the bit at the bottom of the bore.

IPC Classes  ?

• E21B 4/14 - Fluid operated hammers
• E21B 21/12 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
• E21B 33/128 - PackersPlugs with a member expanded radially by axial pressure
• E21B 33/129 - PackersPlugs with mechanical slips for hooking into the casing
• E21B 21/10 - Valves arrangements in drilling-fluid circulation systems
• E21B 17/18 - Pipes provided with plural fluid passages
• E21B 33/12 - PackersPlugs
• E21B 10/38 - Percussion drill bits characterised by conduits or nozzles for drilling fluids
• E21B 17/10 - Wear protectorsCentralising devices

Abstract

A bit retention system for a hammer drill including a housing (41), a drive sub (44) connected to lower end of the housing, and a bit retainer (50) having an upper end suspendable from a shoulder of the drive sub and a lower end including a radially inwardly projecting bit retention rim (52). The upper end of a locking sleeve (70) has internal features (78) that are engageable with external features (76) at the lower end of the housing to prevent relative rotation, and a lower end sized (82) to overlap the upper end (90) of the retainer. The lower end of the locking sleeve is welded to the retainer, thus locking the threads on the drive sub from unscrewing from housing threads. The drive sub and retaining member are pinned together to stop separate rotation.

IPC Classes  ?

• E21B 10/36 - Percussion drill bits
• E21B 17/043 - CouplingsJoints between rod and bit, or between rod and rod threaded with locking means
• E21B 12/00 - Accessories for drilling tools
• E21B 4/06 - Down-hole impacting means, e.g. hammers

Goods & Services

Pneumatic down hole hammers

Goods & Services

Drill bits for pneumatic down hole hammers

Goods & Services

VALVELESS PNEUMATIC DOWN HOLE HAMMERS

Goods & Services

Down-Hole Water, Oil and Gas Drilling Equipment-Namely, Bits, Hammers, Rotary Drill Pipe, Adaptors, and Parts Thereof