Horizontal Directional Reaming

Abstract

The disclosure relates to embodiments of horizontal directional drilling equipment and methods for horizontal directional drilling techniques including a reamer head comprising a frustoconical body, wherein the frustoconical body defines a cavity configured to receive at least one bearing; and a plurality of teeth mounted to the frustoconical body. An imaginary apex of the frustoconical body is superimposed on the centerline of a reamer or reaming apparatus for reaming of an underground arcuate path. In another embodiment the reamer head is a progressive independently segmented reaming head. A plurality reaming heads are mounted to a reaming apparatus for reaming of an underground arcuate path.

Claims

1. An apparatus for reaming an underground arcuate path comprising: a reamer line defining a centerline axis; a centralizing ring connected to the reamer line; a plurality of arms mounted to the centralizing ring; a plurality of reamer heads, one each of the reamer heads respectively mounted and corresponding to one each of the plurality of arms; and a plurality of teeth mounted to each reamer head, wherein each of the plurality of teeth is configured to rotate and ream the underground arcuate path.

2. The apparatus for reaming the underground arcuate path according to claim 1, further comprising a means for rotationally reducing friction external to each of the reamer heads.

3. The apparatus for reaming the underground arcuate path according to claim 1, wherein each of the reamer heads comprises a frustoconical body; wherein the frustoconical body defines a cavity configured to receive at least one bearing; and wherein the plurality of teeth are mounted to the frustoconical body.

4. The apparatus for reaming the underground arcuate path according to claim 3, wherein the frustoconical body is truncated across one end.

5. The apparatus for reaming the underground arcuate path according to claim 4, wherein the frustoconical body defines an imaginary apex projecting beyond the truncated end that coincides with the centerline axis.

6. The apparatus for reaming the underground arcuate path according to claim 5, wherein the frustoconical body is less than or equal to about seventy-five percent of the size relative to a conical body defined by the imaginary apex.

7. The apparatus for reaming the underground arcuate path according to claim 1, wherein each of the reamer heads comprises a conical body; wherein the conical body defines a cavity configured to receive at least one bearing; wherein the plurality of teeth are mounted to the conical body; and wherein the conical body comprises a plurality of independently rotational and stacked annular truncated conical segments.

8. The apparatus for reaming the underground arcuate path according to claim 7, wherein each of said independently rotational and stacked annular truncated conical segments has more than one of the plurality of teeth mounted thereon.

9. The reamer apparatus for reaming an underground arcuate path of claim 1, wherein each of the plurality of reamer heads defines a cavity; and further comprising: a plurality of cylindrical bearings respectively mounted between each of the respective arms and each of the respective reamer heads within the cavity, wherein the cavity has a truncated cone profile, wherein the truncated cone profile accepts at least two levels of the plurality of cylindrical bearings, wherein the level of cylindrical bearings proximate a truncated end is substantially the same size as the other level due to an imaginary apex as determined by the truncated end.

10. A reamer head apparatus, comprising: a frustoconical body, wherein the frustoconical body defines a cavity configured to receive at least one bearing; and a plurality of teeth mounted to the frustoconical body.

11. The reamer head apparatus of claim 10, wherein the frustoconical body is truncated across one end.

12. The reamer head apparatus of claim 11, wherein the frustoconical body defines an imaginary apex projecting beyond the truncated end that coincides with a centerline axis of an assembled reamer.

13. A reamer head apparatus, comprising: a conical body, wherein the conical body defines a cavity configured to receive at least one bearing; and a plurality of teeth mounted to the conical body, wherein the conical body comprises a plurality of independently rotational and stacked annular truncated conical segments.

14. The reamer head apparatus according to claim 13, wherein each of said independently rotational and stacked annular truncated conical segments has more than one of the plurality of teeth mounted thereon.

15. A method for reaming an underground arcuate path, comprising the steps of: rotating a plurality of reamer heads; and reaming the underground arcuate path whilst reducing friction external of the reaming heads between the reaming heads and a surrounding wall of the underground arcuate path.

16. The method for reaming an underground arcuate path of claim 15, wherein said step of rotating the plurality of reamer heads comprises independently rotating a plurality of stacked annular truncated conical segments.

17. The method for reaming an underground arcuate path of claim 15, wherein said step of rotating the plurality of reamer heads comprises rotating a plurality of frustoconical bodies comprising the reamer heads about a centerline coinciding with an imaginary apex of each of the plurality of frustoconical bodies.

18. The method for reaming an underground arcuate path of claim 15, wherein said step of rotating the plurality of reamer heads comprises rotating a plurality of truncated conical bodies defining an imaginary apex about a central axis having the imaginary apex superimposed and coinciding with a centerline axis defined by a reamer line.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0016] The embodiments may be better understood, and numerous objects, features, and advantages made apparent to those skilled in the art by referencing the accompanying drawings. These drawings are used to illustrate only typical embodiments of this invention, and are not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness.

[0017] FIG. 1 shows an exploded view of a Prior Art drill bit and arm.

[0018] FIG. 2 shows a schematic view along the axis of rotation of a Prior Art reaming apparatus or reamer having drill bit cones as reaming heads.

[0019] FIG. 3 shows a partial sectional view of a Prior Art bearing mechanism in combination with a drill bit cone as a reaming head.

[0020] FIG. 4 depicts a schematic elevation view of an exemplary embodiment of a reamed hole crossing along an underground arcuate path after a prior drilled and/or reamed hole crossing.

[0021] FIG. 5 shows an exploded view of an exemplary embodiment of an improved reaming head and arm.

[0022] FIG. 6 shows a perspective view of an exemplary embodiment of a split-bit reamer or reaming apparatus featuring mounted improved reaming heads.

[0023] FIG. 7 shows a schematic view along the axis of rotation of an exemplary embodiment of a split-bit reamer featuring mounted improved reaming heads.

[0024] FIG. 8 shows a side view of an exemplary embodiment of a progressive independently segmented reaming head mounted to an arm of a split-bit reamer.

[0025] FIG. 9 shows a partial sectional view of an exemplary embodiment of an improved bearing mechanism 90 between an arm 34 of a split-bit reamer (not shown) and an improved reaming head (not shown).

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0026] The description that follows includes exemplary apparatus, methods, techniques, and instruction sequences that embody techniques of the inventive subject matter. However, it is understood that the described embodiments may be practiced without these specific details.

[0027] Referring to FIG. 4, the hole 52 is reamed by the reamer 50 to make a larger hole 54. A pilot hole (not shown or potentially 52) is drilled to begin a crossing. The pilot hole may be reamed after drilling to make an intermediate or relatively larger hole 52. The intermediate hole 52 is reamed against walls 53 by reamer 50 to make a larger hole 54. The reamer 50 was dispatched from the rig 61 opposite drilling rig 60 and drills the arcuate path or crossing 54 through the earth 10 and may cross beneath an obstacle 12 such as, for example, a body of water, a transportation way, etc.

[0028] FIG. 5 shows an exploded view of an exemplary embodiment of an improved reamer head 30 and split-bit reamer arm 34. The improved reamer head 30 has a frustoconical, truncated cone (via truncated end 33), or conical frustum shape or substantially frustoconical, truncated cone, conical frustum shape, or frustoconical body 32. The improved reamer head 30 has teeth 38. The improved reamer head 30 rotates about its center axis 36 and has center of rotation, located at its imaginary apex 40, which can/will align with the center of rotation or centerline 56 of a split-bit reamer (not shown in FIG. 5, but represented in FIG. 6 or 7) for reducing friction/drag externally as the reamer 50 moves into/through the hole 52 and circumferentially reams surrounding walls 53 (causing friction/drag) to create a larger hole 54. The imaginary apex 40 is the apex of imaginary conical surfaces 39a, 39b of improved reamer head 30. The imaginary conical surfaces 39a, 38b may be an imaginary projection or extrapolation based upon the shape (e.g. frustoconical, truncated cone, or conical frustum shape or substantially frustoconical, truncated cone, or conical frustum shape) of improved reamer head 30 (or more specifically of frustoconical body 32) and defines an imaginary conical shape 41. As the radius of the frustoconical or truncated conical body 32 varies along its height, the imaginary apex 40 (omitted from the frustoconical body 32) can be matched to or mounted to be coincidental with (or superimposed upon) the center of rotation 40 (along centerline 56) of the fully assembled reaming apparatus. Each reamer head 30 defines a center cavity or bore (not shown in FIG. 5) for mounting on arm 34 that may accommodate bearings 92, 94, 96 (see FIG. 9) or have a bearing surface (not shown) for mounting on and rotation about the arm 34.

[0029] In FIG. 5, in one embodiment, the frustoconical body 32 may be about sixty-five to seventy-five percent relative to the size or volume of a full cone (i.e. as defined by the imaginary conical shape 41).

[0030] FIG. 6 shows a perspective view of an exemplary embodiment of a split-bit reamer or reaming apparatus 50 featuring mounted improved reaming heads 30. The split-bit reamer 50 may be attached to a reamer line 59 through which muds or drilling fluids (not shown) travel. The exemplary embodiment of the split bit reamer 50 shown usually has a centralizing ring or shroud 58 connected to the body 51 of the split-bit reamer 50, with a plurality of arms 34 extending from the body 51, wherein an improved reaming head 30 is mounted to each of the plurality of arms 34. The split-bit reamer 50 rotates about its centerline or central axis 56 (defined by the split-bit reamer 50 and/or the reamer line 59).

[0031] FIG. 7 shows a schematic view along the axis of rotation of an exemplary embodiment of a split-bit reamer 50 featuring mounted improved reaming heads 30 and centralizing ring 58. The center of rotation 40 (along axis 36) for each of the improved reaming heads 30 aligns or coincides (i.e. at a distance L represented in FIG. 5) with the center of rotation of the reamer 80 along the reamer centerline axis 56 (shown in FIG. 6). In other words, the center axis 36 of each respective reaming head 50 intersects the reamer centerline axis 56 coinciding with the imaginary apex 40 at center of rotation of the reamer 80.

[0032] FIG. 8 shows a side view of an exemplary embodiment of a progressive independently segmented reamer head 130 mounted to an arm 134 of a split-bit reamer (not shown but mounted similar as represented in FIG. 2). This exemplary embodiment of a progressive independently segmented reaming head 130 comprises stacked, annular segments or pieces 132 which are collectively mounted to form a cone or conical shape or substantially cone shape 131. Each of the respective stacked, annular segments or pieces 132a-e may each be truncated cones or frusto-conical shaped or conical frustums all varying sequentially in radius along the height of the progressive independently segmented reamer head 130. The segment 132e at the apex of the cone shape 131 or the tip of the reamer head may be conical or substantially conical (or may alternatively annular similar to other segments, yet having the smallest radius that varies along its height). The stacked pieces 132 have a consecutively larger diameter along the height or length of the reamer head 130 (starting from the apex) and independently rotate on a center shaft (not shown) in forming the cone-shaped 131 progressive independently segmented reaming head 130. Each of the independently rotational and stacked annular truncated conical segments 132a-e respectively has a plurality of teeth 138 mounted thereon. Each of the respective stacked, annular segments or pieces 132a-e has a center bore (not shown) for mounting on arm 134 that may accommodate bearings (not represented in FIG. 8) or have a bearing surface (not shown) for mounting on and rotation about the arm 134. It is to be appreciated that each of the respective stacked, annular segments or pieces 132a-e may independently rotate (subject to any frictional forces) for reducing friction/drag externally as the reamer 50 moves into/through the hole 52 and circumferentially reams walls 53 (causing friction/drag) to create a larger hole 54.

[0033] FIG. 9 shows a partial sectional view of an exemplary embodiment of an improved bearing mechanism 90 between an arm 34 of a split-bit reamer 50 (shown in FIG. 7) for mounting of an improved reaming head 30 (shown in FIG. 5). The improved bearing mechanism 90 in this sectional view includes an upper cylindrical bearing 94 and a lower cylindrical bearing 92, and in one embodiment, each of the cylindrical bearings 92, 94 being the same size or substantially the same size (this is to be contrasted with FIG. 3 and its related discussion above; note in FIG. 9 bearing 92 is relatively longer as compared/contrasted to FIG. 3 bearings proximate the apex due to the reduction of angularity in the embodiments of FIGS. 5, 6, 7 & 9, e.g. by way of example only, 5-25 reduction of angularity). The angularity and design of the bearings is matched to fit the embodiments represented in FIGS. 5-7. The length of the upper cylindrical bearing 94 relative to the lower cylindrical bearing 92 is not necessarily drawn to scale in FIG. 9 but shown schematically and it is to be appreciated they may be of substantially the same length and/or width.

[0034] It is understood that the present disclosure is not limited to the particular applications and embodiments described and illustrated herein, but covers all such variations thereof as come within the scope of the claims. While the embodiments are described with reference to various implementations and exploitations, it will be understood that these embodiments are illustrative and that the scope of the inventive subject matter is not limited to them. Many variations, modifications, additions and improvements are possible.

[0035] Plural instances may be provided for components, operations or structures described herein as a single instance. In general, structures and functionality presented as separate components in the exemplary configurations may be implemented as a combined structure or component. Similarly, structures and functionality presented as a single component may be implemented as separate components. These and other variations, modifications, additions, and improvements may fall within the scope of the inventive subject matter.

[0036] The reference numbers in the claims are not intended to be limiting in any way nor to any specific embodiment represented in the drawings, but are included to assist the reader in reviewing the disclosure for purposes of a provisional filing.