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1. WO2013126955 - AMÉLIORATIONS APPORTÉES À LA PROSPECTION DE FOND DE TROU ET SYSTÈMES, DISPOSITIFS ET PROCÉDÉS D'ORIENTATION POUR DES ÉCHANTILLONS DE CAROTTES

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

[ EN ]

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A method of determining orientation of a core obtained by drilling the core from a subsurface body of material, the method including:

a) determining that vibration from drilling is at or below a nominated level of vibration,

b) recording data relating to orientation of the core to be retrieved, the data recorded using a downhole core orientation data recording device,

c) separating the core from the subsurface body, and

d) obtaining from the core orientation data recording device an indication of the orientation of the core based on the recorded data obtained when the vibration from drilling was below the nominated level of vibration and before the core was separated from the subsurface body.

2. A method according to claim 1 , wherein the nominated level of vibration is when drilling has ceased for that drill.

3. A method according to claim 2, wherein when drilling having ceased is at the end of a drilling activity immediately prior to separating the core.

4. A method according to any one of claims 1 to 3, wherein no further data relating to core orientation is needed to be obtained for use after separating the core from the subsurface body.

5. A method according to any one of the preceding claims, wherein, once drilling has ceased, a predetermined time interval elapses before the core is separated from the subsurface body.

6. A method according to any one of the preceding claims, wherein the first time period is a predetermined time determined to be between drilling having ceased and the core is subsequently separated from the subsurface body of material.

7. A method according to claim 6, wherein the predetermined first time period does not exceed 90 seconds.

8. A method according to claim 7, wherein the predetermined first time period is between 10 seconds and 60 seconds.

9. A method according to any one of the preceding claims, including determining a dip value for use in determining the core orientation.

10. A method according to claim 9, wherein the dip value is obtained during the period of drilling vibration below the threshold.

11. A method according to claim 10, wherein the dip value is obtained when drilling has ceased but prior to separating the core from the body.

12. A method according to any one of the preceding claims, wherein the core is separated from the subsurface body by breaking.

13. A method according to any one of the preceding claims, wherein separating the core from the subsurface body takes less than 1 minute.

14. A method according to any one of the preceding claims, including criteria of identifying that there is no drilling vibration, subsequently separating the core from the subsurface body and then subsequently determining that there is a period of no drilling vibration.

15. A method according to claim 14, wherein, in one or more of the criteria therein is not met, the data sample or the core orientation data obtained is disregarded for the purpose of determining core orientation.

16. A method according to any one of the preceding claims, wherein separation of the core from the subsurface body of material is determined by detecting acceleration, change of acceleration, tension or strain or change in tension or strain resulting from a force applied to the core and the core separating from the subsurface body.

17. A method according to claim 16, wherein the acceleration or change in acceleration is detected by at least one accelerometer provided within the core orientation data recording device.

18. A method according to claim 17, wherein the acceleration or change in acceleration detected is in a Z direction in line with an advancing drilling activity.

19. A method according to claim 16, wherein the tension or strain or change in tension or strain is detected by at least one strain gauge within or on a portion of the downhole equipment associated with obtaining the core.

20. A method according to claim 19, wherein the at least one strain gauge is within or on the core orientation data recording device or within or on a section of drill tube.

21. A method according to any one of the preceding claims, wherein once the core orientation is obtained, the core orientation data recording device is

shutdown or turned to low power standby mode in preparation to be put into an orientation recording mode again.

22. A method according to any one of the preceding claims, including retrieving the core to the surface, and setting the core orientation data recording device to an orientate mode.

23. A method according to claim 22, including setting the orientate mode using a remote communication device communicating with the core orientation data recording device.

24. A method according to claim 22 or 23, the core orientation data recording device including one or more lights or other visual indicators to give an indication of required orientation and/or direction to rotate the core for marking the core.

25. A method according to claim 24, whereby, once in orientate mode, visual indications indicate to an operator which direction to rotate the core to find the correct 'down side' of the core for marking the orientation thereof.

26. A method according to any one of claims 22 to 25, whereby,

communication to the core orientation data recording device is effected via the remote communication device and the remote communication device will then verify that the correct orientation was achieved based on the orientation data recorded.

27. A method according to any one of the preceding claims, including detecting pressure, a pressure differential or change in pressure to indicate that drilling should cease in order to then determine orientation of the core.

28. A method according to claim 27, including detecting increase in the pressure or detecting the pressure being above a threshold pressure in an inner core tube receiving the core.

29. A method according to claim 27, including detecting a difference in pressure between the interior of the inner core tube and exterior of the inner core tube.

30. A'method according to any one of claims 27 to 29, wherein pressure or change in pressure, or pressure differential of a drilling fluid is detected.

31. A method according to claim 30, wherein the drilling fluid is drilling mud, water or a combination thereof.

32. A method according to any one of the preceding claims, wherein the core orientation data recording device records an indication of core orientation after a predetermined period of time for the vibration being at or below the nominated level.

33. A system for determining orientation of a core using a method according to any one of the preceding claims, the system including at least a core orientation data recording device and a core drilling assembly.

34. A system according to claim 33, including a remote communication device configured to communicate with the core orientation data recording device to identify a required orientation of the core.

35. A system according to claim 33 or 34, the core orientation data recording device including at least one visual indicator to show one or more of a direction to rotate the core to obtain the required orientation or a visual indication to show the required orientation.

36. A system according to any one of claims 32 to 35, including at least one pressure sensor to detect pressure or change in pressure or a pressure differential.

37. A system according to claim 36, wherein the at least one pressure sensor is provided on or within a core orientation data recording device and/or on or within a portion of a drilling tube.

38'. A system according to claim 36, wherein the at least one sensor is operatively connected to the core orientation data recording device.

39. A method of determining orientation of a core sample obtained by drilling from aboveground into a subsurface body, the method including:

a) operating a downhole data gathering device to detect when vibration from drilling is below a threshold;

b) recording data relating to a core sample being obtained by the drilling when vibration from drilling is below a threshold;

c) providing an input to a user operated communication device;

d) the communication device identifying a time of the user input to the communication device;

e) retrieving the data gathering device and core sample;

f) communicating between the communication device and the retrieved data gathering device;

g) determining from indications provided by the retrieved data gathering device an orientation of the core sample.

40. A method according to claim 39, the input to the communication device including one or more of an indication of a most recent occurrence when drilling ceased, an indication immediately prior to separating the core sample from the subsurface body, an indication after separating the core sample from the subsurface body.

41. A method according to claim 39 or 40, the communication device controlling the data gathering device to cease gathering data.

42. A method according to any one of claims 39 to 41 , the retrieved data gathering device providing survey data to the communication device or another receiver, the survey data being or derived from recorded data obtained when the no vibration had been detected.

43. A method according to claim 42, the data gathering device providing to the communication device survey data relating to recorded data obtained prior to a defined period of time.

44. A method according to claim 43, wherein the defined period of time is provided to the retrieved data gathering device from the communication device.

45. A method according to claim 43 or 44, wherein the defined period of time is used by the data gathering device to identify recorded data obtained during surveying at a time prior to the amount of the defined time.

46. A method according to claim 45, wherein the identified recorded data provided as survey data to the communication device or other receiver is or derives from recorded data recorded by the data gathering device at a period in time closest to the time prior to the amount of defined time than any other recorded data event.

47. A method according to any one of claims 39 to 46 wherein, the data gathering device detects that vibration is occurring and waits until a subsequent no vibration event occurs before recording data.

48. A method according to any one of the preceding claims 39 to 47 wherein, the data gathering device detects multiple consecutive survey values during a period of no vibration.

49. A method according to claim 48, wherein acceptable recorded data is identified with a timestamp relating to real time.

50. A method of obtaining downhole survey data in a borehole created by drilling, the method including advancing a data gathering device into the borehole, the data gathering device determining that vibration is below a predetermined threshold, bringing the data gathering device out of a standby mode during a period when. vibration is determined to be below the threshold, recording data during the period, returning the data gathering device to a standby mode when vibration is determined to be above the threshold or sufficient said data has recorded.

51. A method according to any one of claims 39 to 50 wherein, the threshold is no vibration from drilling.

52. A method according to any one of claims 39 to 51 , whereby, when drilling is stopped; the data gathering device records core orientation data; the core is subsequently separated from its connection with the ground; the communication device signals to the data gathering device to identify the recorded core

orientation data that was immediately prior to separating the core sample from the ground; and using that recorded core orientation data to identify orientation of the core sample.

53. A system for use in determining orientation of a core sample obtained by drilling from aboveground into a subsurface body, the system including a data gathering device arranged and configured with control means to detect when vibration from drilling is below a threshold, and activation means to cause the data gathering device to record data during the period of vibration below the threshold.

54. A system according to claim 53, wherein the threshold is no vibration from drilling.

55. A system according to claim 53 or 54, the data gathering device including a timer providing a timestamp for recorded data events.

56. A system according to claim 53, 54 or 55, including a communication device including communication means arranged and configured to communicate a time value to the data gathering device, the data gathering device including processing means which determines from the received time value the closest recorded data obtained immediately prior to a time determined by subtracting the received time value from a current time value.

57. A system according to claim 56, wherein the current time value is provided by the communication device to the data gathering device.

58. A core orientation marking system to provide an identification mark on a core indicating a desired orientation of the core extracted from a below ground body of material, the system including a core orientation identification device and a marker device, the core orientation identification device including an alignment means and a mounting means to mount the device relative to an end of a tube exposing an end of the core to be marked, the mounting means permitting the device to rotate about the end of the tube, the alignment means arranged to provide an indication of correct alignment of the device relative to a known alignment of the core, and the marker device providing an identifiable mark on the end of the core corresponding to the known alignment of the core.

59. A system according to claim 58, wherein the core orientation identification device is manually rotated about the tube end or rotated by force of gravity.

60. A system according to claim 58 wherein the core orientation is marked manually.

61. A system according to claim 58 or 59, wherein the core orientation identification device includes at least one light arranged to indicate when the device is correctly orientated relative to the core to identify the required core orientation.

62. A system according to claim 61 , wherein the at least one light is controlled to flash to indicate orientation is not yet correct.

63. A system according to claim 61 or 62, wherein the at least one light is controlled to flash slower the nearer to correct orientation is achieved by rotating the device about the tube and shows steady when correct orientation is identified.

64. A system according to any one of claims 58 to 63, wherein correct orientation is upright or substantially vertical relative to a corresponding upright or substantially vertical alignment of the orientation of the core.

65. A system according to any one of claims 58 to 64, wherein the device include two or more biased opposed members permitting width adjustment for mounting the device to respective tubes of a variety of diameters.

66. A system according to claim 65, wherein the biased opposed members include at least two opposed jaws.

67. A system according to claim 66, wherein the biased opposed members include rollers that are brought into contact with the tube when the device adjusts to the diameter of the tube and wherein the device is arranged to, rotate by force of gravity about the tube.

68. A system according to any one of claims 58 to 67, including electronics and a power source for the electronics, the electronics including one or more accelerometers to detect correct orientation of the device and to send a signal or cease send a signal to indicate the correct orientation of the device relative to the known orientation of the core.

69. A system according to any one of claims 58 to 68, wherein the marker device is actuated automatically to mark the core by remote operation from a remote controller.

70. A system according to claim 69, wherein the device includes a settable latch mechanism that is released upon receipt of a release signal to effect marking the core.

71. A system according to claim 70, wherein the latch mechanism including a solenoid operated release.

72. A system according to any one of claims 58 to 71 wherein a remote controller is arranged to send a signal to the device to effect core marking, and the device includes electronics to detect whether the device is correctly orientated relative to the core, and to effect marking if orientation of the core and device correspond, and to prevent marking if the orientation of the core and device do not correspond.

73. A system according to claim 72, wherein successful marking is logged in a memory of the remote controller or transmitted to another device.