REAMING SYSTEM

Abstract

A reaming system including an elongated tubular housing having a first end and a fluid inlet aperture. The elongated tubular housing includes a second end having a fluid outlet aperture. The reaming system includes a first bearing pack disposed circumferentially about the first end of the housing. The first bearing pack is only of sacrificial materials which may be drilled through. The reaming system includes an auger. The reaming system includes a reaming tool functionally coupled to the auger. The reaming tool may be a tool selected from the group consisting of: a float shoe, a reamer shoe, and a guide shoe. The reaming system includes a second bearing pack functionally coupled to a bottom end of the auger. The reaming system includes a connection sub functionally coupled to a bottom end of the auger that transfers rotational motion from the auger to an attached tool.

Claims

1. A reaming system, comprising: a) an elongated tubular housing, including: a1) a first end having a fluid inlet aperture; a2) a second end, opposite the first end, having a fluid outlet aperture and a3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube; and b) a first bearing pack disposed circumferentially about the first end of the housing; and c) an auger disposed within the housing and functionally coupled to the first bearing pack such that the auger may rotate with respect to an attached casing tube and including a rotation transmission structure that transfers rotation motion.

2. The system of claim 1, further comprising a reaming tool functionally coupled to the auger.

3. The system of claim 1, further comprising a casing tube coupled to the housing.

4. The system of claim 1, further comprising a hydraulic fluid disposed within the housing and flowing therethrough.

5. The system of claim 1, further comprising a pump in fluid communication with the casing tube.

6. The system of claim 2, wherein the reaming tool is a tool selected from the group consisting of: a float shoe, a reamer shoe, and a guide shoe.

7. The system of claim 1, further comprising a second bearing pack functionally coupled to a bottom end of the auger.

8. The system of claim 1, further comprising a connection sub functionally coupled to a bottom end of the auger that transfers rotational motion from the auger to an attached tool and including a lock assembly that locks an attached tool to the connection sub.

9. The system of claim 1, wherein the auger rotates within the housing.

10. The system of claim 1, wherein the first bearing pack is only of sacrificial materials which may be drilled through.

11. The system of claim 1, wherein the auger includes a spiral blade wrapped about a central axle.

12. The system of claim 7, wherein the second bearing pack is not only of sacrificial materials and includes an internal profile sized substantially similar to an inner profile of a casing tube such that a drill may pass through without having to drill therethrough.

13. A mandrel assembly, comprising: a) an elongated tubular housing, including: a1) a first end having a fluid inlet aperture; a2) a second end, opposite the first end, having a fluid outlet aperture and a3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube; and b) a first bearing pack disposed circumferentially about the first end of the housing; and c) an auger disposed within the housing and functionally coupled to the first bearing pack such that the auger may rotate with respect to an attached casing tube and including a rotation transmission structure that transfers rotation motion.

14. The assembly of claim 13, further comprising a second bearing pack functionally coupled to a bottom end of the auger.

15. The assembly of claim 14, further comprising a connection sub functionally coupled to a bottom end of the auger that transfers rotational motion from the auger to an attached tool and including a lock assembly that locks an attached tool to the connection sub.

16. The assembly of claim 15, wherein the auger rotates within the housing.

17. The assembly of claim 16, wherein the first bearing pack is only of sacrificial materials which may be drilled through.

18. The assembly of claim 17, wherein the auger includes a spiral blade wrapped about a central axle.

19. The assembly of claim 18, wherein the second bearing pack is not only of sacrificial materials and includes an internal profile sized substantially similar to an inner profile of a casing tube such that a drill may pass through without having to drill therethrough.

20. A reaming system, comprising: a) an elongated tubular housing, including: a1) a first end having a fluid inlet aperture; a2) a second end, opposite the first end, having a fluid outlet aperture and a3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube; and b) a first bearing pack disposed circumferentially about the first end of the housing; wherein the first bearing pack is only of sacrificial materials which may be drilled through; c) an auger disposed within the housing and functionally coupled to the first bearing pack such that the auger may rotate with respect to an attached casing tube and including a rotation transmission structure that transfers rotation motion; wherein the auger rotates within the housing; wherein the auger includes a spiral blade wrapped about a central axle; d) a reaming tool functionally coupled to the auger; wherein the reaming tool is a tool selected from the group consisting of: a float shoe, a reamer shoe, and a guide shoe; e) a casing tube coupled to the housing; f) a hydraulic fluid disposed within the housing and slowing therethrough; g) a pump in fluid communication with the casing tube; h) a second bearing pack functionally coupled to a bottom end of the auger; wherein the second bearing pack is not only of sacrificial materials and includes an internal profile sized substantially similar to an inner profile of a casing tube such that a drill may pass through without having to drill therethrough; and i) a connection sub functionally coupled to a bottom end of the auger that transfers rotational motion from the auger to an attached tool and including a lock assembly that locks an attached tool to the connection sub.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order for the advantages of the invention to be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawing(s). It is noted that the drawings of the invention are not to scale. The drawings are mere schematics representations, not intended to portray specific parameters of the invention. Understanding that these drawing(s) depict only typical embodiments of the invention and are not, therefore, to be considered to be limiting its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawing(s), in which:

[0032] FIG. 1 is a side elevational view of a reaming system, according to one embodiment of the invention;

[0033] FIG. 2 is a partial cross-sectional perspective view of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention;

[0034] FIG. 3 is a partial side elevational view of a top portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention;

[0035] FIG. 4 is a partial cross-sectional perspective view of a top portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention;

[0036] FIG. 5 is a partial side elevational view of a bottom portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention;

[0037] FIG. 6 is a partial cross-sectional perspective view of a bottom portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention;

[0038] FIG. 7 is a side cross-sectional view of a middle portion of a mandrel assembly, according to one embodiment of the invention;

[0039] FIG. 8 is a top perspective view of an elongated tubular housing and a first bearing pack, according to one embodiment of the invention;

[0040] FIG. 9 is a side elevational view of a second bearing pack with an elongated tubular housing illustrated transparently, according to one embodiment of the invention; and

[0041] FIG. 10 is a plurality of perspective views of shoes, according to one embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0042] For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the exemplary embodiments illustrated in the drawing(s), and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications of the inventive features illustrated herein, and any additional applications of the principles of the invention as illustrated herein, which would occur to one skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention.

[0043] Reference throughout this specification to an embodiment, an example or similar language means that a particular feature, structure, characteristic, or combinations thereof described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases an embodiment, an example, and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment, to different embodiments, or to one or more of the figures. Additionally, reference to the wording embodiment, example or the like, for two or more features, elements, etc. does not mean that the features are necessarily related, dissimilar, the same, etc.

[0044] Each statement of an embodiment, or example, is to be considered independent of any other statement of an embodiment despite any use of similar or identical language characterizing each embodiment. Therefore, where one embodiment is identified as another embodiment, the identified embodiment is independent of any other embodiments characterized by the language another embodiment. The features, functions, and the like described herein are considered to be able to be combined in whole or in part one with another as the claims and/or art may direct, either directly or indirectly, implicitly or explicitly.

[0045] As used herein, comprising, including, containing, is, are, characterized by, and grammatical equivalents thereof are inclusive or open-ended terms that do not exclude additional unrecited elements or method steps. Comprising is to be interpreted as including the more restrictive terms consisting of and consisting essentially of.

[0046] FIG. 1 is a side elevational view of a reaming system, according to one embodiment of the invention. There is shown a reaming system 11 designed to cut the final size and finish of a drill hole. Generally, a reaming system, device, etc. will not make the original hole, but instead, enlarge and/or clean or otherwise make more smooth the interior of a previously drilled or bored hole. The illustrated reaming system 11 includes a rig structure (derrick) 14 supporting a casing 13 lead by a mandrel assembly 38 that is disposed within a hole 39. The derrick 14 includes structure and devices to operate the mandrel assembly and to permit the addition of more casing sections as the mandrel assembly works its way down the hole. Accordingly, the reaming system 11 advantageously allows for a hole to be reamed and lined with a casing for future operations, such as but not limited to oil production. Similar reaming systems may be constructed for reaming in other contexts, wherein the derrick is replaced with appropriate support structure and/or wherein the casing may or may not be present.

[0047] The illustrated reaming system 11 includes a derrick 14 for supporting the components and parts of the reaming system 11 during use. A derrick is a lifting device generally including a guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. The term derrick is also applied to the framework supporting a drilling apparatus in an oil rig.

[0048] The illustrated derrick includes a crown block 83. The illustrated crown block 83 is functionally coupled to a traveling block 82 that travels vertically within the derrick 14. A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded and is opposite and above the traveling block. A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded is opposite (and under) the crown block (the stationary section). The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights in the hundreds of thousands of pounds. On larger drilling rigs, when raising and lowering the derrick, line tensions over a million pounds are not unusual.

[0049] The illustrated derrick 14 includes a motor 84 or other power source that may be used to operate one or more pumps, winches, drills, and/or the like and combinations thereof. The motor 84 may be used to pump fluid through the casing and thereby through the mandrel assembly to cause a shoe at a bottom portion of the mandrel assembly to rotate at high speeds and with strong torque to effectively ream the hole.

[0050] The illustrated derrick 14 also includes a blowout preventer 86 functionally coupled around a top of the hole 39. The blowout preventer 86 is generally a large, specialized valve or similar mechanical device, usually installed redundantly in stacks, used to seal, control and monitor oil and gas wells. Blowout preventers were developed to cope with extreme erratic pressures and uncontrolled flow (formation kick) emanating from a well reservoir during drilling. Kicks may lead to a potentially catastrophic event known as a blowout. In addition to controlling the down hole (occurring in the drilled hole) pressure and the flow of oil and gas, blowout preventers are intended to prevent tubing (e.g. drill pipe and well casing), tools and drilling fluid from being blown out of the wellbore (also known as bore hole, the hole leading to the reservoir) when a blowout threatens. Blowout preventers improve the safety of crew, rig (the equipment system used to drill a wellbore) and environment, and to the monitoring and maintenance of well integrity; thus blowout preventers are intended to provide fail-safety to the systems that include them.

[0051] The reaming system 11 includes a mandrel assembly 38 coupled to a bottom end of the casing 13 and configured to ream a drill hole when a shoe is coupled to a bottom end thereof. The mandrel assembly 38 may be coupled to the bottom end of the casing in a variety of manners, including but not limited to mating threads, snap-fits, friction fitting, adhesives, bolts, and the like and combinations thereof. The mandrel assembly 38 grips a shoe, which is the operating component that interfaces with the interior of the hole to be reamed and abrades away material, thereby reaming the hole. The shoe generally includes protrusions that, when the shoe spins, impact with non-smooth regions of the interior of the hole and thereby abrade the same making such regions more smooth and increasing the effective interior diameter of the same so that the casing can follow behind without getting stuck.

[0052] Generally, after the drilling is completed for a particular section of a hole, one puts a casing down the hole to create a smooth interior bore through which additional work may be completed. However, the hole is generally not perfect and often includes defects that can stop the casing from going all the way down. Accordingly, it is desirable to put a reaming tool, the operating tip of which is usually called a shoe, towards the bottom to ream out the hole as the casing slides down.

[0053] In one non-limiting embodiment, there is a reaming system, device, and/or mandrel assembly that is, advantageously, a low costs system that attaches to any of a great variety of shoes (e.g. float shoe, reamer shoe, guide shoe) from a variety of manufacturers. It includes an internal/central axle that rotates inside a housing and/or includes a pin-down connection (e.g. pin to pin, box-pin) to couple to a shoe so it can connect to any tool/shoe. The internal axle spins when you pump fluid through the mandrel assembly and spins a sub that is connected to the shoe which therefore also spins. The internal axle and/or other centrally positioned parts are generally of an aluminum and/or zinc alloy (or other material that may be drilled through rather easily, since the mandrel assembly is generally left at a bottom of the hole when the casing is finished being installed). There is an internal corkscrew/auger shaped set of blades that cause the internal axle to rotate and thus cause the tool to rotate when fluid is pumped through the housing that contains the corkscrew/auger.

[0054] It may be that there is an auger in fluid communication with the inside of the casing with in use. It may be that there is a mandrel (i.e. axle) fixedly coupled to the auger. Such may be a single molded piece with the auger. It may be that there is a connection sub (e.g. pin to pin, pin to box, box to box, box to pin) inside the housing that may be coupled by a threaded connection that may be assembled with the bottom bearing pack and/or that selectably couples to the shoe. It may be that there are bearing packs functionally coupled between the mandrel and the housing. It may be that a housing is selectably coupled to a casing when in use with a fluid tight seal. It may be that there is a set of apertures near the bottom of a mandrel assembly in fluid communication with the shoe which may have nozzles and thereby hydraulic fluid exits therefrom. It may be that there is an auger with a pair of bearing packs (one top and one bottom). It may be that a bottom bearing pack is coupled to a connection sub such that an attached shoe does not fall off when the mandrel assembly is drilled through, thus reducing the likelihood of fouling the hole with debris that is more difficult to drill through.

[0055] FIG. 2 is a partial cross-sectional perspective view of a mandrel assembly with an elongated tubular housing 12 illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, a first bearing pack 26, a second bearing pack 50, an auger 28 and a reaming tool (shoe) 38 functionally coupled thereto.

[0056] The illustrated mandrel assembly 70 is for drilling or reaming down a drill hole. The mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts disposed therein and also to channel fluid therethrough such that flowing fluid causes the auger to spin. The elongated tubular housing 12 includes a first end 14 having a fluid inlet aperture 16; wherein fluid enters the elongated tubular housing 12 therein, passes through a hollow interior of the first bearing pack 26 into the auger 28, through apertures in the rotation transmission structure 32, through a hollow interior of the second bearing pack 50, and then out the mandrel assembly (generally through nozzles in a front region of the attached shoe), then up the sides of the hole between the casing that follows the mandrel assembly and the hole and thereby back out the hole. The elongated tubular housing 12 includes a second end 18, opposite the first end 14, and having a fluid outlet aperture 20; wherein fluid entering from the fluid inlet aperture 16 exits out the fluid outlet aperture 20, out near and/or from the shoe. The elongated tubular housing 12 includes a coupling structure 22 at the first end 14 of the housing that selectably mates with a bottom end of a casing tube 24, thereby coupling a casing tube 24 to the elongated tubular housing 12.

[0057] The illustrated mandrel assembly 70 includes a first bearing pack 26 disposed circumferentially about the first end 14 of the housing 12. Notably, the illustrated first bearing pack 26 is of a smaller diameter than the illustrated second bearing pack 50. The illustrated first bearing pack 26 is generally made only of sacrificial materials which may be drilled through (e.g. aluminum and/or zinc alloys), while the second bearing pack may have an interior diameter sufficiently large enough to allow for a drill to pass through without needing to drill the bearing pack itself. Accordingly the second bearing pack may be of materials that are harder and/or more difficult to drill through than the materials used in the first bearing pack.

[0058] The illustrated mandrel assembly 70 includes an auger 28 disposed within the housing 12 and functionally coupled to the first bearing pack 26 such that the auger 28 rotates with respect to an attached casing tube 24. The auger 28 includes a rotation transmission structure 32 that transfers rotation motion. The illustrated auger 28 rotates within the housing 12. The auger 28 includes a spiral blade 34 wrapped about a central axle 36, wherein fluid may be pumped therethrough to cause the spiral axle to rotate and thereby cause the shoe to also rotate. Applicant notes, for clarity, that the auger does not drill, dig, or otherwise move material to be reamed (e.g. earth), but is instead part of a power transfer mechanism to cause the shoe to operate against the material being reamed.

[0059] The illustrated mandrel assembly 70 includes a second bearing pack 50 functionally coupled to a bottom end of the auger 28. The second bearing pack 50 is not generally only of sacrificial materials and therefore may include materials that are more difficult to drill through. The second bearing pack 50 cooperates with the first bearing pack to allow for the auger and axle to rotate with respect to the housing when fluid is pumped therethrough.

[0060] The illustrated mandrel assembly 70 includes a connection sub 60 functionally coupled to a bottom end of the auger 28 that transfers rotational motion from the auger 28 to an attached tool 38. The connection sub 60 includes a lock assembly 62 that locks the attached tool 38 to the connection sub 60. The lock assembly 62 is disposed circumferentially about the end of the tubular housing at a radius that is large enough to not be destroyed when drilled through (similar to how the second bearing pack is not destroyed during drill-through). Accordingly, the lock assembly continues to grip the shoe and keep the same coupled to the tubular housing even while the shoe is being drilled through. Thus the shoe does not dislodge and fall into the hole during drilling.

[0061] FIG. 3 is a partial side elevational view of a top portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, and a first bearing pack 26.

[0062] The illustrated mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts of the mandrel assembly 70. The elongated tubular housing 12 includes a first end 14, wherein fluid may enter therein. The elongated tubular housing 12 includes a coupling structure at the first end 14 of the housing that selectably mates with a bottom end of a casing tube 24.

[0063] The illustrated mandrel assembly 70 includes a first bearing pack 26 disposed circumferentially about the first end 14 of the housing 12. The first bearing pack 26 is only made of sacrificial materials which may be drilled through. The mandrel assembly 70 includes an auger (not shown) disposed within the housing 12 and functionally coupled to the first bearing pack 26 such that the auger rotates with respect to an attached casing tube 24. The auger includes a spiral blade 34 wrapped about a central axle 36.

[0064] FIG. 4 is a partial cross-sectional perspective view of a top portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, and a first bearing pack 26.

[0065] The illustrated mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts disposed therein. The elongated tubular housing 12 includes a first end 14 having a fluid inlet aperture 16. The elongated tubular housing 12 includes a coupling structure 22 at the first end 14 of the housing that selectably mates with a bottom end of a casing tube.

[0066] The illustrated mandrel assembly 70 includes a first bearing pack 26 disposed circumferentially about the first end 14 of the housing 12. The first bearing pack 26 is only made of sacrificial materials which may be drilled through. The mandrel assembly 70 includes an auger (not shown) disposed within the housing 12 and functionally coupled to the first bearing pack 26 such that the auger rotates with respect to an attached casing tube. The auger includes a rotation transmission structure 32 that transfers rotation motion. The auger rotates within the housing 12. The auger includes a spiral blade 34 wrapped about a central axle 36.

[0067] FIG. 5 is a partial side elevational view of a bottom portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, a second bearing pack, an auger 28, a connection sub, and a reaming tool (shoe) 38.

[0068] The illustrated mandrel assembly 70 is for drilling or reaming down a drill hole. The mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts disposed therein. The elongated tubular housing 12 includes a second end 18, opposite a first end (not shown). The mandrel assembly 70 includes an auger 28 disposed within the housing and functionally coupled to a first bearing pack (not shown) such that the auger 28 rotates with respect to an attached casing tube. The auger 28 includes a rotation transmission structure that transfers rotation motion. The illustrated auger 28 rotates within the housing. The auger 28 includes a spiral blade 34 wrapped about a central axle 36.

[0069] The mandrel assembly 70 includes a second bearing pack 50 functionally coupled to a bottom end 52 of the auger 28. The second bearing pack 50 is not only of sacrificial materials. The second baring pack 50 includes an internal profile 54 sized substantially similar to an inner profile 56 of a casing tube such that a drill may pass through without having to drill therethrough.

[0070] The mandrel assembly 70 includes a connection sub 60 functionally coupled to a bottom end of the auger 28 that transfers rotational motion from the auger 28 to an attached tool 38. The connection sub 60 includes a lock assembly 62 that locks the attached tool 38 to the connection sub 60.

[0071] There are apertures 33 through the illustrated rotation transmission structure 32 such that fluid may pass from the auger-region of the tubular housing interior to through a hollow interior of the second bearing pack and into the shoe. The illustrated shoe 38 includes a nozzle 57 out through which fluid may exit the system into the hole.

[0072] FIG. 6 is a partial cross-sectional perspective view of a bottom portion of a mandrel assembly with an elongated tubular housing illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, a second bearing pack, an auger 28, a connection sub, and a reaming tool 38.

[0073] The illustrated mandrel assembly 70 is for drilling or reaming down a drill hole. The mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts disposed therein. The elongated tubular housing 12 includes a second end 18, opposite a first end (not shown). The mandrel assembly 70 includes an auger 28 disposed within the housing 12 and functionally coupled to a first bearing pack (not shown) such that the auger 28 rotates with respect to an attached casing tube. The auger 28 includes a rotation transmission structure 32 that transfers rotation motion. The illustrated auger 28 rotates within the housing 12. The auger 28 includes a spiral blade (not illustrated) wrapped about a central axle.

[0074] The mandrel assembly 70 includes a second bearing pack 50 functionally coupled to a bottom end 52 of the auger 28. The second bearing pack 50 is not only of sacrificial materials. The second baring pack 50 includes an internal profile 54 sized substantially similar to an inner profile 56 of a casing tube such that a drill may pass through without having to drill therethrough.

[0075] The mandrel assembly 70 includes a connection sub 60 functionally coupled to a bottom end of the auger 28 that transfers rotational motion from the auger 28 to an attached tool 38. The connection sub 60 includes a lock assembly 62 that locks the attached tool 38 to the connection sub 60 at a radius substantially similar to that of the second bearing pack 50 so that the shoe 38 stays connected thereto when being drilled through.

[0076] FIG. 7 is a side cross-sectional view of a middle portion of a mandrel assembly, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing having a first end and a second end.

[0077] The illustrated mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts of the mandrel assembly 70. The elongated tubular housing 12 includes a first end 14 having a fluid inlet aperture. The elongated tubular housing 12 includes a second end 18, opposite the first end 14, and having a fluid outlet aperture; wherein fluid entering from the fluid inlet aperture exits out the fluid outlet aperture.

[0078] The illustrated mandrel assembly 70 includes a first bearing pack 26 disposed circumferentially about the first end 14 of the housing 12. The first bearing pack 26 is only made of sacrificial materials which may be drilled through. The mandrel assembly 70 includes an auger 28 disposed within the housing 12 and functionally coupled to the first bearing pack 26 such that the auger 28 rotates with respect to an attached casing tube. The illustrated auger 28 rotates within the housing 12. The auger 28 includes a spiral blade 34 wrapped about a central axle 36.

[0079] The mandrel assembly 70 includes a second bearing pack 50 functionally coupled to a bottom end 52 of the auger 28. The second bearing pack 50 is not only of sacrificial materials. The mandrel assembly 70 includes a connection sub 60 functionally coupled to a bottom end of the auger 28 that transfers rotational motion from the auger 28 to an attached tool. The connection sub 60 includes a lock assembly 62 that locks the attached tool to the connection sub 60.

[0080] FIG. 8 is a top perspective view of an elongated tubular housing and a first bearing pack, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12 and a first bearing pack 26.

[0081] The illustrated mandrel assembly 70 is for drilling or reaming down a drill hole. The mandrel assembly 70 includes an elongated tubular housing 12 configured to support and protect the components and parts disposed therein. The elongated tubular housing 12 includes a first end 14 having a fluid inlet aperture 16.

[0082] The illustrated mandrel assembly 70 includes a first bearing pack 26 disposed circumferentially about the first end 14 of the housing 12. The first bearing pack 26 is only made of sacrificial materials which may be drilled through. The mandrel assembly 70 includes an auger 28 disposed within the housing 12 and functionally coupled to the first bearing pack 26 such that the auger 28 rotates with respect to an attached casing tube 24. The auger 28 includes a spiral blade 34 wrapped about a central axle 36.

[0083] FIG. 9 is a side elevational view of a second bearing pack with an elongated tubular housing illustrated transparently, according to one embodiment of the invention. There is shown a mandrel assembly 70 including an elongated tubular housing 12, an auger 28, a second bearing pack 50, and a connection sub 60.

[0084] The illustrated mandrel assembly 70 is for drilling or reaming down a drill hole. The elongated tubular housing 12 includes a second end 18, opposite a first end (not shown). The mandrel assembly 70 includes an auger 28 disposed within the housing 12 and functionally coupled to a first bearing pack (not shown) such that the auger 28 rotates with respect to an attached casing tube. The auger 28 includes a rotation transmission structure that transfers rotation motion. The illustrated auger 28 rotates within the housing 12. The auger 28 includes a spiral blade 34 wrapped about a central axle 36.

[0085] The mandrel assembly 70 includes a second bearing pack 50 functionally coupled to a bottom end 52 of the auger 28. The second bearing pack 50 is not only of sacrificial materials. The mandrel assembly 70 includes a connection sub 60 functionally coupled to a bottom end of the auger 28 that transfers rotational motion from the auger 28 to an attached tool. The connection sub 60 includes a lock assembly 62 that locks the attached tool to the connection sub 60.

[0086] FIG. 10 is a plurality of perspective views of shoes, according to one embodiment of the invention. Shoes may be of a variety of shapes and/or may have various connectors that may be coupled to a mandrel assembly as described herein. Such shoes are generally hollow capped cylindrical bodies with textures exterior surfaces for abrading hole walls when spun and may include nozzles near a front thereof out through which fluid may be expelled by pressure.

[0087] It is understood that the above-described embodiments are only illustrative of the application of the principles of the present invention. The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiment is to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

[0088] For example, although the illustrated auger includes a central axle at an interior region of the spiral blades of the auger, an auger may have a central axle that is a cylinder disposed on an exterior of the blades, such that the blades are contained therein. There may be an internal mandrel/auger with an external spiral profile.

[0089] Further, while fixed (i.e. non-rotating) connections between parts will generally be threaded connections threaded in a direction such that any typical rotation of the same will tend to tighten the connection, such connections may be of any type of connection that creates a non-rotating fluid tight connection between such parts, including but not limited to tight snap-fit connectors, bolts, industrial adhesives, and the like and combinations thereof suitable for the environment and stresses under which such parts will be operated.

[0090] Additionally, although the figures illustrate two bearing packs, a top pack and a bottom pack, there may be additional bearing packs. Also, the auger spiral may be clockwise or counter clockwise as needed for the desired spin of the shoe.

[0091] It is also envisioned that in one embodiment of the invention, there is no bottom bearing pack and the entire device below the first bearing pack spins, thereby spinning the attached shoe. A shoe may be fixedly coupled to a bottom of a mandrel assembly instead of being rotatable with respect to the mandrel assembly housing.

[0092] It is expected that there could be numerous variations of the design of this invention. An example is that the mandrel assembly may be adorned, branded, or otherwise decorated with decorative layers, engravings, bass relief structures and the like and combinations thereof.

[0093] Finally, it is envisioned that the components of the device may be constructed of a variety of materials, unless otherwise indicated herein, including but not limited to metals, plastics, ceramics, stone, wood, resins, woven fibers, alloys, composites and/or combinations thereof.

[0094] Thus, while the present invention has been fully described above with particularity and detail in connection with what is presently deemed to be the most practical and preferred embodiment of the invention, it will be apparent to those of ordinary skill in the art that numerous modifications, including, but not limited to, variations in size, materials, shape, form, function and manner of operation, assembly and use may be made, without departing from the principles and concepts of the invention as set forth in the claims. Further, it is contemplated that an embodiment may be limited to consist of or to consist essentially of one or more of the features, functions, structures, methods described herein.