Downhole core sampling and testing apparatus

Abstract

A coring apparatus permitting the taking of a non-rotating core sample and testing of same, as by NMR, prior to breakage and ejection from the apparatus. A core barrel is suspended from a rotating outer sleeve by one or more bearing assemblies which permit the core barrel to remain stationary during rotation of the sleeve with attached core bit for cutting the core. A core test device is fixed with respect to the core barrel on the outside thereof to test the core as it proceeds through the barrel. The apparatus optionally includes a directional detecting device such as an inclinometer and a compact set of circumferentially-spaced steering arms for changing the direction of the apparatus during coring.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The field of this invention relates to sampling and downhole testing techniques for subterranean formation cores, particularly applications using continuous nuclear magnetic resonance analyses of formation cores in a measurement-while-drilling mode.

2. State of the Art

It is desirable for the well operator to test the properties of the formation adjacent the wellbore. Frequently, properties such as permeability and porosity are measured using techniques, including, but not limited to, nuclear magnetic resonance (NMR), X-ray, or ultrasonic imaging.

One way of using techniques for measurement of formation properties is to drill the hole to a predetermined depth, remove the drillstring, and insert the source and receivers in a separate trip in the hole and use NMR to obtain the requisite information regarding the formation. This technique involves sending out signals and capturing echoes as the signals are reflected from the formation. This technique involved a great deal of uncertainty as to the accuracy of the readings obtained in that it was dependent on a variety of variables, not all of which could be controlled with precision downhole.

Coring has also been another technique used to determine formation properties. In one prior technique, a core is obtained in the wellbore and brought to the surface where it is subjected to a variety of tests. This technique also created concerns regarding alteration of the properties of the core involved in the handling of the core to take it and bring it to the surface prior to taking measurements. Of paramount concern was how the physical shocks delivered to the core would affect its ability to mimic true downhole conditions and, therefore, lead to erroneous results when tested at the surface.

Other techniques have attempted to take a core while drilling a hole and take measurements of the core as it is being captured. These techniques which have involved NMR are illustrated in U.S. Pat. Nos. 2,973,471 and 2,912,641. In both of these patents, an old-style bit has a core barrel in the middle, which rotates with the bit. As the core advances in the core barrel as a net result of forward progress of the bit, the core passes through the alternating current and direct current fields and is ultimately ejected into the annulus.

The techniques shown in the two described patents have not been commercially employed in the field. One of the problems with the techniques illustrated in these two patents is that the core integrity is destroyed due to the employment of a rotating core barrel. The rotating core barrel, which moves in tandem with the bit, breaks the core as it enters the core barrel and before it crosses the direct current and radio frequency fields used in NMR. The result was that unreliable data is gathered about the core, particularly as to the properties of permeability and porosity which are greatly affected by cracking of the core. Additionally, the physical cracking of the core also affected readings for bound water, that is water which is not separable from the core mass.

SUMMARY OF THE INVENTION

An apparatus is disclosed that allows the taking of cores during drilling into a nonrotating core barrel. NMR measurements and tests are conducted on the core in the nonrotating barrel and thereafter, the core is broken and ejected from the barrel into the wellbore annulus around the tool. In conjunction with a nonrotating core barrel, a sub is included in the bottomhole assembly, preferably adjacent to the bit, which, in conjunction with an inclinometer of known design, allows for real-time ability to control the movement of the bit to maintain a requisite orientation in a given drilling program. The preferred embodiment involves the use of a segmented permanent magnet to create direct current field lines, which configuration facilitates the flow of drilling fluid within the tool around the outside of the core barrel down to the drill bit so that effective drilling can take place.

The apparatus of the present invention overcomes the sampling drawbacks of prior techniques by allowing a sample to be captured using the nonrotating core barrel and run past the NMR equipment. Various techniques are then disclosed to break the core after the readings have been taken so that it can be easily and efficiently ejected into the annular space. A steering mechanism is also provided as close as practicable to the drill bit to allow for orientation changes during the drilling process in order to facilitate corrections to the direction of drilling and to provide such corrections as closely as possible on a real-time basis while the bit advances. The specific technique illustrated is usable in combination with the disclosed nonrotating core barrel, which, due to the space occupied by the core barrel, does not leave much space on the outside of the core barrel to provide the necessary mechanisms conventionally used for steering or centralizing.

Another advantage of the present invention is the provision of components of the NMR measurement system in such a configuration as to minimize any substantial impediment to the circulating mud which flows externally to the core barrel and through the drill bit to facilitate the drilling operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a sectional elevational view showing the nonrotating core barrel and one of the techniques to break the core after various measurements have taken place.

FIG. 2 is a sectional elevational view of the steering sub, with the arms in a retracted position.

FIG. 2a is the view in section through FIG. 2, showing the disposition of the arms about the steering sub.

FIG. 3 is a schematic illustration showing the use of a segmented permanent magnet as the source of the DC field lines in the preferred embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 shows the general layout of the components, illustrating, at the bottom end of the bottomhole assembly, a core bit 10, which has a plurality of inserts 12, usually polycrystalline diamond compact (PDC) cutting elements, which cut into the formation upon rotation and application of weight on bit (WOB) to the bottomhole assembly to create the wellbore W. The bit 10 is attached at its upper end to tubular sleeve or housing 14 which rotates with the bit 10. Ultimately, the sleeve 14 is connected to the lower end of a pipe or tubing string (not shown) extending from the surface to the bottom hole assembly. Internal to the sleeve 14 is a core barrel 16 which is nonrotating with respect to the sleeve 14.

The core barrel 16 is supported by lower bearing assembly 18, which includes a seal assembly 20 to prevent the circulating mud which is in the annulus 22, formed between the core barrel 16 and the sleeve 14, from getting into the lower bearing assembly 18 and precluding rotation of the bit 10 and sleeve 14 with respect to the core barrel 16. Lower bearing assembly 18 also includes longitudinal passages therethrough to allow the circulating mud to pass to core bit 10 on the exterior of core barrel 16 in annulus 22.

The nonrotating core barrel 16 also has an upper bearing assembly 24, which has a seal assembly 26, again to keep out the circulating mud in the annulus 22 from entering the upper bearing assembly 24. It should be noted that the seals 20 and 26 can be employed in upper and lower pairs as required to isolate the circulating mud in the annulus 22 from the contacting bearing surfaces of the stationary core barrel 16 and the rotating assembly of the sleeve 14. Those skilled in the art will appreciate that a hub 28, which is affixed to the rotating sleeve 14 and supports a part of the upper bearing assembly 24, as well as seal 26, has longitudinal passages therethrough to allow the circulating mud to pass.

Outside of the stationary core barrel 16, a permanent magnet 30 is disposed and can be seen better by looking at FIG. 3. The transmitting coil 32 and receiving coil 34 are disposed as shown in FIG. 3 so that the direct current field lines 36 are transverse to the RF field lines 38. The preferred embodiment illustrates the use of a permanent magnet 30; however, electromagnets can also be used without departing from the spirit of the invention. In the preferred embodiment, the magnet 30 has a C-shape, with an inwardly oriented DC field. This shape provides additional clearance in the annulus 22 to permit mud flow to the bit 10. Thus, one of the advantages of the apparatus of the present invention is the ability to provide a nonrotating core barrel 16, while at the same time providing the necessary features for NMR measurement without materially restricting the mud flow in the annulus 22 to the core bit 10. Alternative shapes which have an inwardly oriented DC field are within the scope of the invention.

Continuing to refer to FIG. 3, the balance of the components is shown in schematic representation. A surface-mounted power source, generally referred to as 40, supplies power for the transmitter and receiver electronics, the power being communicated to a location below electronics 44 within sleeve 14 comprising a rotating joint such as a slip-ring connection or preferably an inductive coupling 42. Thus, the transition between the downhole electronics 44 (see FIG. 1) which rotates with sleeve 14 and coils 32 and 34, which are rotationally fixed with regard to core barrel 16, occurs through the inductive coupling 42. The inductive coupling 42 is the transition point between the end of the nonrotating core barrel 16 and the rotating ejection tube 45. In essence, the inductive coupling 42 incorporates a ferrite band on the core barrel 16 and a pick-up wire involving one or more turns on the rotating ejection tube 45. The rotating sleeve 14 supports the inductive coupling 42 with the transition between fixed and rotating components located within the inductive coupling 42.

Also illustrated in FIG. 1 is a kink or jog 46 which acts to break the core after it passes through the measurement assembly shown in FIG. 3. The breaking of the core can be accomplished by a variety of techniques not limited to putting a kink or jog 46 in the tube. Various other stationary objects located in the path of the advancing core within the nonrotating barrel 16 can accomplish the breaking of the core. Accordingly, blades, grooves or knives can be used in lieu of the kink or jog 46. The breaking of the core facilitates the ultimate ejection of the core from the exit port 48 of the ejection tube 45.

With this layout as illustrated, the driller can alter the weight on bit to meet the necessary conditions without affecting the integrity of the core.

One of the concerns in drilling is to maintain the appropriate orientation of the bit as the drilling progresses. The desirable coring technique, which is illustrated by use of the apparatus as previously described, can be further enhanced by providing steering capability as the core is being taken. An additional sub can be placed in the assembly shown in FIG. 1, preferably as close to the bit 10 as possible. This assembly can be made a part of the rotating sleeve 14 and is illustrated in FIGS. 2 and 2a. It has a rotating inner body 49 on which an outer body 50 is mounted using bearings 52 and 54. Seals 56 and 58 keep well fluids out of the bearings 52 and 54. As a result, the outer body 50 does not rotate with respect to rotating inner body 49.

The outer body 50 supports an inclinometer 60, which is a device known in the art. Power and output signals from the inclinometer pass through a slip ring 62 for ultimate transmission between the nonrotating outer body 50 and the rotating inner body 49. In the preferred embodiment, a plurality of arms 64 is oriented at 120 degrees, as shown in FIG. 2a. Each of the arms 64 is pivoted around a pin 66. Electrical power is provided which passes through the slip ring 62 into the outer body 50 and to a thrust pad 68 associated with each arm 64. Upon application of electrical power through wires such as wines 70 (see FIG. 2a), the thrust pad 68 expands, forcing out a particular arm 64. The arms 64 can be operated in tandem as a centralizer or individually for steering, with real-time feedback obtained through the inclinometer 60. The closer the arms 64 are placed to the bit 10, the more impact they will have on altering the direction of the bit 10 while the core is being taken. In the preferred embodiment, the thrust pad 68 can be made of a hydro-gel, which is a component whose expansion and contraction can be altered by electrical, heat, light, solvent concentration, ion composition, pH, or other input. Such gels are described in U.S. Pat. Nos. 5,274,018; 5,403,893; 5,242,491; 5,100,933; and 4,732,930. Alternatively, a metal compound, such as mercury, which responds to electrical impulse with a volume change may be employed. Accordingly, with the feedback being provided from the inclinometer 60, electrical current or other triggering input can be controllably transmitted to the thrust pads 68 to obtain the desired change in orientation of the bit 10 on the run while the core is being taken due to selective volume changes.

Those skilled in the art will appreciate with the disclosure of this invention that reliable coring while drilling techniques have been disclosed that give the ability, using NMR or other techniques, to obtain reliable readings of the core being taken as the drilling of the wellbore progresses. The apparatus reveals an ability to provide a nonrotating core barrel 16 without significantly impeding mud flow to the bit 10 through an annulus 22. Additionally, with the core barrel 16 taking up much of the room within the rotating sleeve 14, the apparatus addresses another important feature of being able to steer the bit 10, using real-time feedback from an inclinometer 60, all in an environment which does not lend itself to space for using more traditional actuation techniques for the arms 64. In other words, because the stationary core barrel 16 takes up much of the space within the rotating sleeve 14, traditional piston or camming devices for actuation of the arms 64 become impractical without dramatically increasing the outer diameter of the tool assembly.

The design using the bearing assemblies 18 and 24, along with seals 20 and 26, provides a mechanism for reliably taking a core and measuring its properties using known NMR techniques and other techniques without significant disturbance to the core after it is taken. Prior to ejecting the core and after testing the core, it is sufficiently disturbed and broken up to facilitate the smooth flow through the nonrotating core barrel 16 and ultimate ejection.

As an additional feature of the invention, effective steering is accomplished during the coring and measurement operation.

The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape and materials, as well as in the details of the illustrated construction, may be made without departing from the spirit of the invention.

Claims

1. An apparatus for extracting and testing a core of subterranean rock while maintaining physical integrity of the core, comprising:

a rotatable tubular sleeve;

a core bit secured to a lower end of said rotatable tubular sleeve, said core bit defining a bit face aperture;

a non-rotatable core barrel rotatably suspended within said rotatable tubular sleeve and aligned with said bit face aperture; and

a core testing device fixedly mounted adjacent said non-rotatable core barrel within said rotatable tubular sleeve, said core testing device configured to permit drilling mud flow therepast within said rotatable tubular sleeve to said core bit from above said core testing device.

2. The apparatus of claim 1, wherein said core testing device is selected from the group comprising an NMR device, an X-ray device, and an ultrasonic device.

3. The apparatus of claim 1, wherein said core testing device comprises an NMR device including a magnet and associated input and output coils for directing an input field signal across said non-rotatable core barrel and receiving an output RF field signal, characteristics of which are responsive to a presence and characteristics of a rock core within said non-rotatable core barrel.

4. The apparatus of claim 3, wherein said input coil and said output coil are electrically connected to a power source and electronics disposed thereabove through an inductive coupling, a first portion thereof being associated with said non-rotatable core barrel and a second, cooperating portion thereof being associated with said rotatable tubular sleeve.

5. The apparatus of claim 4, wherein said power source is located at the surface of the earth.

6. The apparatus of claim 4, wherein at least a portion of said electronics is located within said rotatable tubular sleeve above said non-rotatable core barrel.

7. The apparatus of claim 1, wherein said core testing device requires an electrical input, generates an electrical output signal, and is electrically connected to a power source and electronics disposed thereabove through an inductive coupling, a first portion thereof being associated with said non-rotatable core barrel and a second, cooperating portion thereof being associated with said rotatable tubular sleeve.

8. The apparatus of claim 7, wherein said power source is located at the surface of the earth.

9. The apparatus of claim 7, wherein at least a portion of said electronics is located within said rotatable tubular sleeve above said non-rotatable core barrel.

10. The apparatus of claim 1, further comprising a core ejector tube having a first inlet end aligned with an outlet of said non-rotatable core barrel and a second exit end opening through said rotatable tubular sleeve to the exterior thereof.

11. The apparatus of claim 10, wherein said core ejector tube is secured at its inlet end to said non-rotatable core barrel outlet through a coupling permitting rotation of said core ejector tube with respect to said non-rotatable core barrel, and said second exit end of said core ejector tube is affixed to said rotatable tubular sleeve.

12. The apparatus of claim 11, wherein said core testing device requires an electrical input and generates an electrical output and is electrically connected to locations above said first inlet end of said core ejector tube through an inductive coupling proximate a connection of the core ejector tube to the non-rotatable core barrel, a first portion of said coupling being fixed with respect to said non-rotatable core barrel and a second, cooperating portion of said coupling being fixed with respect to said rotatable tubular sleeve.

13. The apparatus of claim 12, further including transmitter and receiver electronics disposed within said rotatable tubular sleeve above said core ejector tube first inlet end and rotationally fixed with respect to said rotatable tubular sleeve.

14. The apparatus of claim 1, wherein said non-rotatable core barrel further includes a core breakage structure above said core testing device.

15. The apparatus of claim 14, wherein said core breakage structure comprises a core comminution structure.

16. The apparatus of claim 14, wherein said core breakage structure includes at least one structure from the group comprising a kink in said non-rotatable core barrel, at least one blade, at least one groove, and at least one knife.

17. The apparatus of claim 1, further including at least one directional detection device and a device for controlling bit orientation.

18. The apparatus of claim 17, wherein said at least one directional detection device comprises an inclinometer.

19. The apparatus of claim 17, wherein said bit orientation control device comprises a plurality of circumferentially-spaced, selectively extendable and retractable arms.

20. The apparatus of claim 17, wherein said at least one directional detection device and said bit orientation control device are carried on an outer body rotatably mounted to a body portion rotationally fixed with respect to said rotatable tubular sleeve.

21. The apparatus of claim 20, wherein said at least one directional detection device and said bit orientation control device are electrically powered through a slip ring connection between said outer body and said rotationally fixed body portion.

22. The apparatus of claim 21, wherein said at least one directional detection device comprises an inclinometer.

23. The apparatus of claim 22, wherein said bit orientation control device comprises a plurality of circumferentially-spaced, selectively extendable and retractable arms.

24. The apparatus of claim 23, wherein each of said plurality of arms is selectively extendable and retractable responsive to activation and deactivation of a thrust pad associated with that arm.

25. The apparatus of claim 24, wherein said plurality of arms is hinged to said rotatably mounted outer body at a longitudinally remote location from said thrust pads.

26. The apparatus of claim 1, further comprising a bit orientation control device associated with said rotatable tubular sleeve and located immediately above said core bit.

27. The apparatus of claim 26, wherein said bit orientation control device comprises a plurality of circumferentially-spaced, selectively extendable and retractable arms.

28. The apparatus of claim 27, wherein said bit orientation control device is carried on a body rotatably mounted with respect to said rotatable tubular sleeve.

29. The apparatus of claim 28, wherein said bit orientation control device is electrically powered through a slip ring connection between said rotatably mounted body and said rotatable tubular sleeve.

30. The apparatus of claim 28, wherein said bit orientation control device comprises a plurality of circumferentially-spaced, selectively extendable and retractable arms.

31. The apparatus of claim 30, wherein each of said plurality of arms is selectively extendable and retractable responsive to activation and deactivation of a thrust pad associated with that arm.

32. The apparatus of claim 31, wherein said plurality of arms is hinged to said rotatable mounted body at a longitudinally remote location from said thrust pads.

33. An apparatus for extracting a core of subterranean rock while maintaining physical integrity of the core and subsequently ejecting said core from said apparatus, comprising:

a rotatable tubular sleeve;

a core bit secured to a lower end of said rotatable tubular sleeve, said core bit defining a bit face aperture;

a non-rotatable core barrel rotatably suspended within said rotatable tubular sleeve and aligned with said bit face aperture; and

a core ejector tube having a first inlet end aligned with an outlet of said non-rotatable core barrel and a second exit end opening through said rotatable tubular sleeve to an exterior thereof.

34. The apparatus of claim 33, wherein said core ejector tube is secured at its inlet end to said non-rotatable core barrel outlet through a coupling permitting rotation of said core ejector tube with respect to said non-rotatable core barrel, and said second exit end of said core ejector tube is affixed to said rotatable tubular sleeve.

35. An apparatus for extracting a core of subterranean rock while maintaining physical integrity of said core and subsequently breaking said core, comprising:

a rotatable tubular sleeve;

a core bit secured to a lower end of said rotatable tubular sleeve, said core bit defining a bit face aperture;

a non-rotatable core barrel rotatably suspended within said rotatable tubular sleeve and having a lower end aligned with said bit face aperture to receive a core passing therethrough; and

core breakage structure located within said rotatable tubular sleeve remote from said lower end of said non-rotatable core barrel and operable to break said core at a leading end of said core after said core has traversed a selected length of entry into said non-rotatable core barrel.

36. The apparatus of claim 35, wherein said core breakage structure comprises core comminution structure.

37. The apparatus of claim 35, wherein said core breakage structure includes at least one structure from the group comprising a kink in said non-rotatable core barrel, at least one blade, at least one groove, and at least one knife.