Casing Shoes Diamond Coring
Boart Longyear casing shoes are heavy duty products which can match up to the toughest formations. With the use of very resilient matrix to optimize diamond retention, they will hold up in very abrasive, unfriendly formations.
Casing Shoes
The casing shoes are threaded to the end of the outer drill string for penetration through overburden. It assists in seating the outer drill string into the bedrock, providing a tight seal for the drilling fluids to return to the surface. A casing shoe can be used to ream the casing downward when advancing a casing string in an existing hole with the rod string still in place.
The casing shoe inside diameter is flush or has clearance to the inside diameter (ID) of the casing which allows free passage of the core barrel through the shoe. Casing shoes are available in standard and oversize diameters in impregnated, carbide and surface set.
Casing Bits
These are less commonly used and differ from casing shoes in that the inside diameter of the casing bit is smaller. It will not permit the passage of the core barrel due to the overlap of dimensions. Casing bits are used when deep or difficult overburden is encountered.
Casing Advancer Shoes
The casing advancer shoe is designed much like a typical casing shoe but has an oversized outer diameter which allows for a roller cone to pass through the ID and provides clearance for the extra cuttings generated.
Size
Boart Longyear casing shoes are available in both casing (CAS) and rod (ROD) shoe configurations.
Thread
Boart Longyear casing shoes are available in all standards drilling thread types as well as a number of region-specific sizes.
Matrix
The impregnated diamond bit and products line had been designed to manage an extremely wide variety of ground conditions.
Gauge
Boart Longyear casing shoes are available in four standard gauge configurations.
Standard gauge (S)
Equal to reaming shell gauge (R)
Less than reaming shell gauge (-R)
Oversized OD (OS, INCHES)
Impreg Depth
Boart Longyearís impregnated casing shoes are currently available in three standard impreg depths of .
Waterway Size
Boart Longyear casing shoes offer the widest variety of waterway sizes in the industry. The description represents the number of waterways and the waterway size.
