Air hammer coring apparatus and method

摘要

A coring method and apparatus is provided for extracting a core sample from a subterranean formation and/or drilling a hydrocarbon well, the coring apparatus having: a pneumatic reciprocating hammer having a first end for operatively connecting the pneumatic reciprocating hammer to a drill string, a second end having a hammer bit and a reciprocating piston for reciprocating the hammer bit; and a coring member operatively connected to the pneumatic reciprocation hammer, the coring member comprising an impact anvil and a hollow coring barrel forming an internal longitudinal chamber for accommodating the core sample, the coring barrel positioned below the impact anvil; whereby when the hammer bit strikes the impact anvil, the coring barrel is driven into the formation and the core sample is extracted into the internal longitudinal chamber of the coring barrel.

主权项

1. A coring apparatus for extracting a core sample from a subterranean formation, comprising:
a rotating sub having a first end for operatively connecting the rotating sub to a drill string, and a second end; a pneumatic reciprocating hammer having a first end for operatively connecting the pneumatic reciprocating hammer to the second end of the rotating sub, a second end having a hammer bit, and a reciprocating piston for reciprocating the hammer bit; and a coring member operatively connected to the pneumatic reciprocation hammer, the coring member comprising an impact anvil and a hollow coring barrel forming an internal longitudinal chamber for accommodating the core sample, the coring barrel positioned below the impact anvil such that when the hammer bit strikes the impact anvil, the coring barrel is driven into the formation and the core sample is extracted into the internal longitudinal chamber of the coring barrel; whereby the rotating sub rotates the pneumatic reciprocating hammer and coring member to aid in the extraction of the core sample.