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1. WO2020115484 - APPAREIL DE FORAGE ET PROCÉDÉ DE FORAGE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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CLAIMS

1. Apparatus for a bottom hole assembly, for boring in a bore hole, comprising: one or more conveying means;

for the or each conveying means, a plurality of cutting means, wherein the or each conveying means is arranged to move the respective plurality of cutting means in turn to an end of the conveying means at which to impact a cutting face of a bore hole and away from the end, thereby to deepen the hole.

2. The apparatus of claim 1 , wherein the or each conveying mean is arranged to convey each cutting means to and away from the respective end longitudinally with respect to the length of the bore hole.

3. The apparatus of claim 1 or claim 2, further comprising means for rotating the or each conveying means about an axis extending longitudinally with a length of the bore hole, so that the or each cutting means at the end of the conveying means bores the cutting face.

4. The apparatus of claim 3, wherein a first of the conveying means is arranged to convey a first portion of the cutting means in one direction longitudinally with respect to the length of the hole being bored, and a second of the conveying means is arranged to convey a second portion of the cutting means in the opposite direction.

5. The apparatus of any one of the preceding claims, wherein the or each conveying means comprises:

a frame extending in an elongate loop, wherein each cutting means is slidably mounted on the frame;

means for moving the cutting means around the frame.

6. The apparatus of claim 5, wherein each cutter means is arranged to face outwardly with respect to a middle of the respective frame.

7. The apparatus of claim 6, wherein the or each frame comprises two spaced rails, wherein each cutting means comprises a mount slidably mounted on the two rails, including between the two rails.

8. The apparatus of claim 7, wherein thrust bearings are located between each mount and the or each frame to facilitate sliding, wherein the thrust bearings (e.g. polycrystalline diamond tablets) are fixed to the frame and/or each mount.

9. The apparatus of any one of claims 6 to 8, wherein the or each means for moving the cutting means comprises:

for each cutting means, a blade fixedly coupled to the cutting means and extending on a side of the frame remote from the blade and extending at least partially transversely with respect to a length of the frame;

at least one fluid chamber arranged to receive fluid;

means for directing pressurised fluid from the at least one fluid chamber against the blades, thereby to cause the blades and the cutting means to slide around the frame.

10. The apparatus of any one of claims 1 to 5, wherein the or each conveying means comprises a frame and means (e.g. a track, belt or a chain) moveable about the frame in a loop, wherein respective cutting means are mounted on the means moveable about the frame.

11. The apparatus of any one of the preceding claims, comprising a plurality of the conveying means, wherein planes of each conveying means are parallel.

12. The apparatus of any one of claims 1 to 10, consisting of a single conveying means.

13. The apparatus of any one of the preceding claims, further comprising:

a steerable arm, rotatable with respect to a length of the bore hole, wherein the or each conveying means is mounted on the steerable arm.

14. The apparatus of claim 13 when dependent on claim 11 , wherein the speed of movement of the cutting portions is independently controllable on each of the plurality of conveying means, for steering of the steerable arm.

15. The apparatus of claim 13 or claim 14, further comprising a sanding ring mounted on the steerable arm and extending around the steerable arm, wherein the sanding ring is configured to rotate with the steerable arm and to abrade an interior of the bore hole.

16. An assembly for a bottom hole assembly, comprising:

a frame extending in a loop;

a plurality of cutting means each for impacting a cutting face of a bore hole when located at an end of the frame, wherein each cutting means includes a mount portion slidably mounted on the frame to slide around the frame;

a plurality of thrust bearings fixed to the mount portion and/or the frame to facilitate sliding.

17. The assembly of claim 16, wherein the thrust bearings comprise polycrystalline diamond tablets.

18. A method of boring a hole using boring apparatus comprising one or more conveying means and, for the or each conveying means, a plurality of cutting means movable by the respective conveying means, comprising:

causing movement of the cutting means on the or each conveying means longitudinally with respect to a boring direction, to an end of the respective conveying means at which the cutting means are located to impact a cutting face of the hole for deepening the hole, and away from the end.

19. The method of claim 18, further comprising rotating the boring apparatus, using a motor, about an axis extending longitudinally with a length of the bore hole, so that the or each cutting means at the end of the conveying means bores the cutting face.

20. The method of claim 18 or claim 19, wherein the or each conveying means comprises: a frame extending in an elongate loop, wherein each cutting means is

slidably mounted on the frame, wherein the causing movement comprises causing sliding the cutting means around the frame.

21 . The method of any one of claims 18 to 20, wherein the or each frame comprises two spaced rails, wherein each cutting means comprises a mount slidably mounted on the two rails, including between the two rails, wherein the causing the movement comprises causing each cutting means to slide around the respective frame on the mount.

22. The method of one of claims 20 and 21 , wherein the causing movement of the or each conveying means comprises:

directing pressurised fluid at a blade coupled to the cutting means to cause the cutting means to slide around the frame.

23. The method of any one of claims 18 to 22, comprising a plurality of conveying means, wherein planes of each conveying means are parallel.

24. The method of any one of claims 18 to 23, wherein the causing moving comprises operating a first of the conveying means to move a first portion of the cutting means in a loop in one direction, and operating a second of the conveying means to move a second portion of the cutting means in the opposite direction.

25. The method of claim 22, further comprising a plurality of conveying means, wherein planes of each conveying means are parallel, wherein the causing moving comprises operating a first of the conveying means to move a first portion of the cutting means in a loop in one direction, and operating a second of the conveying means to move a second portion of the cutting means in the opposite direction, wherein the pressure of the fluid is selectable with respect to each of the plurality of conveying means, for steering of the plurality of conveying means.