Core cut off cable

The improved core cut off cable provides a means of being cooled and providing fluids for flushing cuttings away from a drilled core being cut off. The improved core cut off cable consists of a wire cable constructed around and along the length of a cylindrical spiral coil of wire rod so the coil of wire rod will support a hollow chamber through the axial center of the wire cable. Abrasive sections are adhered around the wire cable along one end portion of the wire cable and provides cutting surfaces the wire cable supports.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to the mechanisms used to break or cut off drilled 
cores from the formations from which they were drilled. 
2. Prior Art 
The core cut off cable described in my U.S. Pat. No. 3,837,412 can be 
cooled well when cutting off a drilled core drilled in a vertical hole 
because it would be easy to provide a water environment in this type of 
hole, but if the core cut off cable was used in horizontal holes a water 
environment could not readily be provided and about the only way the core 
cut off cable could be cooled would be by system operation which would 
slow down core extraction. 
SUMMARY OF THE INVENTION 
It is an objective of the invention to provide a core cut off cable that 
can have cooling fluids pumped through its axial center to the portion of 
the core cut off cable that supports cutting surfaces and here pass 
between the wire of the core cut off cable to the outside of the core cut 
off cable cooling the core cut off cable, the cutting surfaces and 
flushing cuttings away from the cutting surfaces.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
As stated above the type of core cut off cable which this application 
provides improvements on is described in my U.S. Pat. No. 3,837,412, 
following is a brief description of how this type of core cut off cable is 
utilized; One end of the core cut off cable is connected to the inside 
wall of a core barrel near the uphole end of a core bit. A portion of the 
same end of the core cut off cable is secured around one half of the 
inside wall of the core barrel near the uphole end of the core bit. The 
rest of the core cut off cable extends to and connects to a pulling 
mechanism. The portion of the core cut off cable secured around half of 
the inside wall of the core barrel has abrasive sections adhered to the 
core cut off cable. While a core is being drilled the core cut off cable 
remains secured to the inside wall of the core barrel. After a core has 
been drilled the weight is taken off the core bit so it will not drill, 
but the core bit and core barrel continue to rotate around the drilled 
core. A pulling tension is applied to the core cut off cable from the 
pulling mechanism which pulls the core cut off cable from where it is 
secured and against the drilled core so the abrasive sections will 
interface with the side of the drilled core and due to the pulling tension 
being applied to the core cut off cable and the rotation of the core 
barrel cut the drilled core from the formation in which it was drilled. As 
stated above a more indepth explanation is provided in the above 
identified patent. As for improvement to this type of core cut off cable 
and in referring to FIG. 1 of this application, shown is wire cable 1 
constructed around and the length of cylindrical spiral coil of wire rod 2 
so that cylindrical spiral coil of wire rod 2 will provide a hollow core 
for wire cable 1. Abrasive sections 4 are adhered around and along one end 
portion of wire cable 1. A hose 3 is laid through coil of wire rod 2 from 
the end of wire cable 1 opposite the end of the end portion where the 
abrasive sections 4 are located to the portion of coil of wire rod 2 that 
extends through the portion of wire cable 1 where the abrasive sections 4 
are located. Cooling fluids such as air, water or other fluids are pumped 
through hose 3 to the portion of coil of wire rod 2 that extends through 
the portion of wire cable 1 where the abrasive sections 4 are located so 
the cooling fluids under pumping pressure will be forced between the coils 
of coil of wire rod 2, between the wire of wire cable 1 to the outside of 
wire cable 1 to cool wire cable 1, abrasive sections 4 and to flush 
cuttings from abrasive sections 4, wire cable 1 and the area of a drilled 
core that the abrasive sections 4 would be cutting. Coil of wire rod 2 
forms an internal structure for wire cable 1 to keep wire cable 1 from 
collapsing hose 3 when a pulling tension is applied to wire cable 1. The 
end of coil of wire rod 2 at the end of the portion of coil of wire rod 2 
that extends through the portion of wire cable 1 where the abrasive 
sections 4 are located is closed by metal cap 5 which is attached to that 
end of coil of wire rod 2 and wire cable 1 to insure that the cooling 
fluids will be forced between the coils of coil of wire rod 2 and the wire 
of wire cable 1. In FIG. 1 the wire of wire cable 1 is constructed around 
coil of wire rod 2 by being woven around coil of wire rod 2. In FIG. 3 
another type of construction is shown, wire cable 6 is constructed of big 
diameter wire that is wound around the coil of wire rod 2. The wire cable 
6 would be used where a large volume of cooling fluids would be needed 
more to flush cuttings than for cooling. In FIG. 1 the cylindrical spiral 
coil of wire rod 2 is wound with closed pitch because closed pitch 
provides the greatest structure strength. For the cutting off of large 
diameter cores drilled in soft formations where a high pulling tension 
would not be required and a large volume of fluids would be required for 
flushing cuttings then a cylindrical spiral coil of wire rod 2 with open 
pitch could be used but the pitch could not be too great or the coil of 
wire rod 2 would collapse and collapse the hose 3. Since the core cut off 
cable utilized as described above would extend under and through the 
center of the diameter of a drilled core after it is cut off, an abrasive 
section 4 would be located on that part of wire cable 1 that would be at 
the center of diameter of a drilled core after it has been cut off to 
insure that an abrasive section 4 will always interface with a drilled 
core until it is completely cut off from the formation from which it was 
drilled.