Modular Fixed Cutter Earth-Boring Bits, Modular Fixed Cutter Earth-Boring Bit Bodies, and Related Methods

Abstract

A modular fixed cutter earth-boring bit body includes a blade support piece and at least one blade piece fastened to the blade support piece. A modular fixed cutter earth-boring bit and methods of making modular fixed cutter earth-boring bit bodies and bits also are disclosed.

Description

BRIEF DESCRIPTION OF THE FIGURES

The features and advantages of the present invention may be better understood by reference to the accompanying figures in which:

FIG. 1 is a photograph of a conventional solid, one-piece, cemented carbide bit body for earth boring bits;

FIG. 2 is photograph of an embodiment of an assembled modular fixed cutter earth-boring bit body comprising six cemented carbide blade pieces fastened to a cemented carbide blade support piece, wherein each blade piece has nine cutting insert pockets;

FIG. 3 is a photograph of a top view of the assembled modular fixed cutter earth-boring bit body of FIG. 2;

FIG. 4 is a photograph of the blade support piece of the embodiment of the assembled modular fixed cutter earth-boring bit body of FIG. 2 showing the blade slots and the mud holes of the blade support piece;

FIG. 5 is a photograph of an individual blade piece of the embodiment of the assembled modular fixed cutter earth-boring bit body of FIG. 2 showing the cutter insert cutter pockets; and

FIG. 6 is a photograph of another embodiment of a blade piece comprising multiple blade pieces that may be fastened in a single blade slot in the blade support piece of FIG. 4.

BRIEF SUMMARY

Certain non-limiting embodiments of the present invention are directed to a modular fixed cutter earth-boring bit body comprising a blade support piece and at least one blade piece fastened to the blade support piece. The modular fixed cutter earth-boring bit body may further comprise at least one insert pocket in the at least one blade piece. The blade support piece, the at least one blade piece, and any other piece or portion of the modular bit body may independently comprise at least one material selected from cemented hard particles, cemented carbides, ceramics, metallic alloys, and plastics.

Further non-limiting embodiments are directed to a method of producing a modular fixed cutter earth-boring bit body comprising fastening at least one blade piece to a blade support piece of a modular fixed cutter earth boring bit body. The method of producing a modular fixed cutter earth-boring bit body may include any mechanical fastening technique including inserting the blade piece in a slot in the blade support piece, welding, brazing, or soldering the blade piece to the blade support piece, force fitting the blade piece to the blade support piece, shrink fitting the blade piece to the blade support piece, adhesive bonding the blade piece to the blade support piece, attaching the blade piece to the blade support piece with a threaded mechanical fastener, or mechanically affixing the blade piece to the blade support piece.

DESCRIPTION OF CERTAIN NON-LIMITING EMBODIMENTS OF THE INVENTION

One aspect of the present invention relates to a modular fixed cutter earth-boring bit body. Conventional earth boring bits include a one-piece bit body with cutting inserts brazed into insert pockets. The conventional bit bodies for earth boring bits are produced in a one piece design to maximize the strength of the bit body. Sufficient strength is required in a bit body to withstand the extreme stresses involved in drilling oil and natural gas wells. Embodiments of the modular fixed cutter earth boring bit bodies of the present invention may comprise a blade support piece and at least one blade piece fastened to the blade support piece. The one or more blade pieces may further include pockets for holding cutting inserts, such as PDC cutting inserts or cemented carbide cutting inserts. The modular earth-boring bit bodies may comprise any number of blade pieces that may physically be designed into the fixed cutter earth boring bit. The maximum number of blade pieces in a particular bit or bit body will depend on the size of the earth boring bit body, the size and width of an individual blade piece, and the application of the earth-boring bit, as well as other factors known to one skilled in the art. Embodiments of the modular earth-boring bit bodies may comprise from 1 to 12 blade pieces, for example, or for certain applications 4 to 8 blade pieces may be desired.

Embodiments of the modular earth-boring bit bodies are based on a modular or multiple piece design, rather than a solid, one-piece, construction. The use of a modular design overcomes several of the limitations of solid one-piece bit bodies.

The bit bodies of the present invention include two or more individual components that are assembled and fastened together to form a bit body suitable for earth-boring bits. For example, the individual components may include a blade support piece, blade pieces, nozzles, gauge rings, attachment portions, shanks, as well as other components of earth-boring bit bodies.

Embodiments of the blade support piece may include, for example, holes and/or a gauge ring. The holes may be used to permit the flow of water, mud, lubricants, or other liquids. The liquids or slurries cool the earth-boring bit and assist in the removal of dirt, rock, and debris from the drill holes.

Embodiments of the blade pieces may comprise, for example, cutter pockets for the PDC cutters, and/or individual pieces of blade pieces comprising insert pockets.

An embodiment of the modular earth-boring bit body 20 of a fixed cutter earth-boring bit is shown in FIG. 2. The modular earth boring bit body 20 comprises attachment means 21 on a shank 22 of the blade support piece 23. Blades pieces 24 are fastened to the blade support piece 23. It should be noted that although the embodiment of the modular earth boring bit body of FIG. 2 includes the attachment portion 21 and shank 22 as formed in the blade support piece, the attachment portion 21 and shank 22 may also be made as individual pieces to be fastened together to form the part of the modular earth boring bit body 20. Further, the embodiment of the modular earth boring bit body 20 comprises identical blade pieces 24. Additional embodiments of the modular earth boring bit bodies may comprise blade pieces that are not identical. For example, the blade pieces may independently comprise materials of construction including but not limited to cemented hard particles, metallic alloys (including, but limited to, iron based alloys, nickel based alloys, copper, aluminum, and/or titanium based alloys), ceramics, plastics, or combinations thereof. The blade pieces may also include different designs including different locations of the cutting insert pockets and mud holes or other features as desired. In addition, the modular earth boring bit body includes blade pieces that are parallel to the axis of rotation of the bit body. Other embodiments may include blade pieces pitched at an angle, such as 5° to 45° from the axis of rotation.

Further, the attachment portion 21, the shank 22, blade support piece 23, and blade pieces 24 may each independently be made of any desired material of construction that may be fastened together. The individual pieces of an embodiment of the modular fixed cutter earth-boring bit body may be attached together by any method such as, but not limited to, brazing, threaded connections, pins, keyways, shrink fits, adhesives, diffusion bonding, interference fits, or any other mechanical connection. As such, the bit body 20 may be constructed having various regions or pieces, and each region or piece may comprise a different concentration, composition, and crystal size of hard particles or binder, for example. This allows for tailoring the properties in specific regions and pieces of the bit body as desired for a particular application. As such, the bit body may be designed so the properties or composition of the pieces or regions in a piece change abruptly or more gradually between different regions of the article. The example, modular bit body 20 of FIG. 2, comprises two distinct zones defined by the six blade pieces 24 and blade support piece 23. In one embodiment, the blade support piece 23 may comprise a discontinuous hard phase of tungsten and/or tungsten carbide and the blade pieces 24 may comprise a discontinuous hard phase of fine cast carbide, tungsten carbide, and/or sintered cemented carbide particles. The blade pieces 24 also include cutter pockets 25 along the edge of the blade pieces 24 into which cutting inserts may be disposed; there are nine cutter pockets 25 in the embodiment of FIG. 2. The cutter pockets 25 may, for example, be incorporated directly in the bit body by the mold, such as by machining the green or brown billet, or as pieces fastened to a blade piece by brazing or another attachment method. As seen in FIG. 3, embodiments of the modular bit body 24 may also include internal fluid courses 31, ridges, lands, nozzles, junk slots 32, and any other conventional topographical features of an earth-boring bit body. Optionally, these topographical features may be defined by additional pieces that are fastened at suitable positions on the modular bit body.

FIG. 4 is a photograph of the embodiment of the blade support piece 23 of FIGS. 2 and 3. The blade support piece 23 in this embodiment is made of cemented carbides and comprises internal fluid courses 31 and blade slots 41. FIG. 5 is a photograph of an embodiment of a blade piece 24 that may be inserted in the blade slot 41 of blade support piece 23 of FIG. 4. The blade piece 24 includes nine cutter insert pockets 51. As shown in FIG. 6, a further embodiment of a blade piece includes a blade piece 61 comprising several individual pieces 62, 63, 64 and 65. This multi-piece embodiment of the blade piece allows further customization of the blade for each blade slot and allows replacement of individual pieces of the blade piece 61 if a bit body is to be refurbished or modified, for example.

The use of the modular construction for earth boring bit bodies overcomes several of the limitations of one-piece bit bodies, for example: 1) The individual components of a modular bit body are smaller and less complex in shape as compared to a solid, one-piece, cemented carbide bit body. Therefore, the components will suffer less distortion during the sintering process and the modular bit bodies and the individual pieces can be made within closer tolerances. Additionally, key mating surfaces and other features, can be easily and inexpensively ground or machined after sintering to ensure an accurate and precision fit between the components, thus ensuring that cutter pockets and the cutting inserts may be located precisely at the predetermined positions. In turn, this would ensure optimum operation of the earth boring bit during service. 2) The less complex shapes of the individual components of a modular bit body allows for the use of much simpler (less sophisticated) machine tools and machining operations for the fabrication of the components. Also, since the modular bit body is made from individual components, there is far less concern regarding the interference of any bit body feature with the path of the cutting tool or other part of the machine during the shaping process. This allows for the fabrication of far more complex shaped pieces for assembly into bit bodies compared with solid, one-piece, bit bodies. The fabrication of similar pieces may be produced in more complex shapes allowing the designer to take full advantage of the superior properties of cemented carbides and other materials. For example, a larger number of blades may be incorporated into a modular bit body than in a one-piece bit body. 3) The modular design consists of an assembly of individual components and, therefore, there would be very little waste of expensive cemented carbide material during the shaping process. 4) A modular bit body allows for the use of a wide range of materials (cemented carbides, steels and other metallic alloys, ceramics, plastics, etc.) that can be assembled together to provide a bit body having the optimum properties at any location on the bit body. 5) Finally, individual blade pieces may be replaced, if necessary or desired, and the earth boring bit could be put back into service. In the case of a blade piece comprising multiple pieces, the individual pieces could be replaced. It is thus not necessary to discard the entire bit body due to failure of just a portion of the bit body, resulting in a dramatic decrease in operational costs.

The cemented carbide materials that may be used in the blade pieces and the blade support piece may include carbides of one or more elements belonging to groups IVB through VIB of the periodic table. Preferably, the cemented carbides comprise at least one transition metal carbide selected from titanium carbide, chromium carbide, vanadium carbide, zirconium carbide, hafnium carbide, tantalum carbide, molybdenum carbide, niobium carbide, and tungsten carbide. The carbide particles preferably comprise about 60 to about 98 weight percent of the total weight of the cemented carbide material in each region. The carbide particles are embedded within a matrix of a binder that preferably constitutes about 2 to about 40 weight percent of the total weight of the cemented carbide.

In one non-limiting embodiment, a modular fixed cutter earth-boring bit body according to the present disclosure includes a blade support piece comprising a first cemented carbide material and at least one blade piece comprised of a second cemented carbide material, wherein the at least one blade piece is fastened to the blade support piece, and wherein at least one of the first and second cemented carbide materials includes tungsten carbide particles having an average grain size of 0.3 to 10 μm. According to an alternate non-limiting embodiment, one of the first and second cemented carbide materials includes tungsten carbide particles having an average grain size of 0.5 to 10 μm, and the other of the first and second cemented carbide materials includes tungsten carbide particles having an average grain size of 0.3 to 1.5 μm. In yet another alternate non-limiting embodiment, one of the first and second cemented carbide materials includes 1 to 10 weight percent more binder (based on the total weight of the cemented carbide material) than the other of the first and second cemented carbide materials. In still another non-limiting alternate embodiment, a hardness of the first cemented carbide material is 85 to 90 HRA and a hardness of the second cemented carbide material is 90 to 94 HRA. In still a further non-limiting alternate embodiment, the first cemented carbide material comprises 10 to 15 weight percent cobalt alloy and the second cemented carbide material comprises 6 to 15 weight percent cobalt alloy. According to yet another non-limiting alternate embodiment, the binder of the first cemented carbide and the binder of the second cemented carbide differ in chemical composition. In yet a further non-limiting alternate embodiment, a weight percentage of binder of the first cemented carbide differs from a weight percentage of binder in the second cemented carbide. In another non-limiting alternate embodiment, a transition metal carbide of the first cemented carbide differs from a transition metal carbide of the second cemented carbide in at least one of chemical composition and average grain size. According to an additional non-limiting alternate embodiment, the first and second cemented carbide materials differ in at least one property. The at least one property may be selected from, for example, modulus of elasticity, hardness, wear resistance, fracture toughness, tensile strength, corrosion resistance, coefficient of thermal expansion, and coefficient of thermal conductivity.

The binder of the cemented hard particles or cemented carbides may comprise, for example, at least one of cobalt, nickel, iron, or alloys of these elements. The binder also may comprise, for example, elements such as tungsten, chromium, titanium, tantalum, vanadium, molybdenum, niobium, zirconium, hafnium, and carbon up to the solubility limits of these elements in the binder. Further, the binder may include one or more of boron, silicon, and rhenium. Additionally, the binder may contain up to 5 weight percent of elements such as copper, manganese, silver, aluminum, and ruthenium. One skilled in the art will recognize that any or all of the constituents of the cemented hard particle material may be introduced in elemental form, as compounds, and/or as master alloys. The blade support piece and the blade pieces, or other pieces if desired, independently may comprise different cemented carbides comprising tungsten carbide in a cobalt binder. In one embodiment, the blade support piece and the blade piece include at least two different cemented hard particles that differ with respect to at least one property.

Embodiments of the pieces of the modular earth boring bit may also include hybrid cemented carbides, such as, but not limited to, any of the hybrid cemented carbides described in co-pending U.S. patent application Ser. No. 10/735,379, which is hereby incorporated by reference in its entirety.

A method of producing a modular fixed cutter earth-boring bit according to the present invention comprises fastening at least one blade piece to a blade support piece. The method may include fastening additional pieces together to produce the modular earth boring bit body including internal fluid courses, ridges, lands, nozzles, junk slots and any other conventional topographical features of an earth-boring bit body. Fastening an individual blade piece may be accomplished by any means including, for example, inserting the blade piece in a slot in the blade support piece, brazing, welding, or soldering the blade piece to the blade support piece, force fitting the blade piece to the blade support piece, shrink fitting the blade piece to the blade support piece, adhesive bonding the blade piece to the blade support piece (such as with an epoxy or other adhesive), or mechanically affixing the blade piece to the blade support piece. In certain embodiments, either the blade support piece or the blade pieces has a dovetail structure or other feature to strengthen the connection.

The manufacturing process for cemented hard particle pieces would typically involve consolidating metallurgical powder (typically a particulate ceramic and powdered binder metal) to form a green billet. Powder consolidation processes using conventional techniques may be used, such as mechanical or hydraulic pressing in rigid dies, and wet-bag or dry-bag isostatic pressing. The green billet may then be presintered or fully sintered to further consolidate and densify the powder. Presintering results in only a partial consolidation and densification of the part. A green billet may be presintered at a lower temperature than the temperature to be reached in the final sintering operation to produce a presintered billet (“brown billet”). A brown billet has relatively low hardness and strength as compared to the final fully sintered article, but significantly higher than the green billet. During manufacturing, the article may be machined as a green billet, brown billet, or as a fully sintered article. Typically, the machinability of a green or brown billet is substantially greater than the machinability of the fully sintered article. Machining a green billet or a brown billet may be advantageous if the fully sintered part is difficult to machine or would require grinding rather than machining to meet the required final dimensional tolerances. Other means to improve machinability of the part may also be employed such as addition of machining agents to close the porosity of the billet. A typical machining agent is a polymer. Finally, sintering at liquid phase temperature in conventional vacuum furnaces or at high pressures in a SinterHip furnace may be carried out. The billet may be over pressure sintered at a pressure of 300-2000 psi and at a temperature of 1350-1500° C. Pre-sintering and sintering of the billet causes removal of lubricants, oxide reduction, densification, and microstructure development. As stated above, subsequent to sintering, the pieces of the modular bit body may be further appropriately machined or ground to form the final configuration.

One skilled in the art would understand the process parameters required for consolidation and sintering to form cemented hard particle articles, such as cemented carbide cutting inserts. Such parameters may be used in the methods of the present invention.

Additionally, for the purposes of this invention, metallic alloys include alloys of all structural metals such as iron, nickel, titanium, copper, aluminum, cobalt, etc. Ceramics include carbides, borides, oxides, nitrides, etc. of all common elements.

It is to be understood that the present description illustrates those aspects of the invention relevant to a clear understanding of the invention. Certain aspects of the invention that would be apparent to those of ordinary skill in the art and that, therefore, would not facilitate a better understanding of the invention have not been presented in order to simplify the present description. Although embodiments of the present invention have been described, one of ordinary skill in the art will, upon considering the foregoing description, recognize that many modifications and variations of the invention may be employed. All such variations and modifications of the invention are intended to be covered by the foregoing description and the following claims.

Claims

1. A modular fixed cutter earth-boring bit body, comprising: a blade support piece; andat least one blade piece fastened to the blade support piece.

2. The modular fixed cutter earth-boring bit body of claim 1, wherein the at least one blade piece includes at least one insert pocket.

3. The modular fixed cutter earth-boring bit body of claim 1, wherein the blade support piece comprises at least one material selected from the group consisting of cemented hard particles, cemented carbides, ceramics, metallic alloys, and plastics.

4. The modular fixed cutter earth-boring bit body of claim 1, wherein the at least one blade piece comprises at least one material selected from the group consisting of cemented hard particles, cemented carbides, ceramics, a metallic alloys, and plastics.

5. The modular fixed cutter earth-boring bit body of claim 3, wherein the at least one blade piece consists essentially of cemented carbide.

6. The modular fixed cutter earth-boring bit body of claim 4, wherein the blade support piece consists essentially of cemented carbide.

7. The modular fixed cutter earth-boring bit body of claim 1, wherein the blade support piece comprises at least one blade slot and each blade piece is fastened in one blade slot.

8. The modular fixed cutter earth-boring bit body of claim 1, wherein the blade support piece comprises a first cemented carbide and the at least one blade piece comprises a second cemented carbide, and wherein the first cemented carbide and the second cemented carbide differ in at least one property.

9. The modular fixed cutter earth-boring bit body of claim 8, wherein the first cemented carbide and the second cemented carbide individually comprise particles of at least one transition metal carbide in a binder.

10. The modular fixed cutter earth-boring bit of claim 9, wherein in the first cemented carbide and the second cemented carbide, the at least one carbide is independently selected from a carbide of a transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and the binder independently comprises at least one metal selected from cobalt, nickel, iron, cobalt alloy, nickel alloy, and iron alloy.

11. The modular fixed cutter earth-boring bit body of claim 10, wherein the binder further comprises at least one alloying agent selected from tungsten, titanium, tantalum, niobium, chromium, molybdenum, boron, carbon, silicon, ruthenium, rhenium, manganese, aluminum, and copper.

12. The modular fixed cutter earth-boring bit body of claim 10, wherein the carbide of the first cemented carbide and carbide of the second cemented carbide comprise tungsten carbide.

13. The modular fixed cutter earth-boring bit body of claim 12, wherein the binder of the first cemented carbide and the binder of the second cemented carbide comprise cobalt.

14. The modular fixed cutter earth-boring bit body of claim 8, wherein the at least one property is selected from the group consisting of modulus of elasticity, hardness, wear resistance, fracture toughness, tensile strength, corrosion resistance, coefficient of thermal expansion, and coefficient of thermal conductivity.

15. The modular fixed cutter earth-boring bit body of claim 9, wherein the binder of the first cemented carbide and the binder of the second cemented carbide differ in chemical composition.

16. The modular fixed cutter earth-boring bit body of claim 9, wherein a weight percentage of the binder of the first cemented carbide differs from a weight percentage of the binder of the second cemented carbide.

17. The modular fixed cutter earth-boring bit body of claim 9, wherein the transition metal carbide of the first cemented carbide differs from the transition metal carbide of the second cemented carbide in at least one of chemical composition and average grain size.

18. The modular fixed cutter earth-boring bit body of claim 9, wherein the first cemented carbide and the second cemented carbide each comprise 2 to 40 weight percent of binder and 60 to 98 weight percent of transition metal carbide.

19. The modular fixed cutter earth-boring bit body of claim 9, wherein at least one of the first cemented carbide and the second cemented carbide comprise tungsten carbide particles having an average grain size of 0.3 to 10 μm.

20. The modular fixed cutter earth-boring bit body of claim 9, wherein one of the first cemented carbide and the second cemented carbide comprise tungsten carbide particles having an average grain size of 0.5 to 10 μm, and the other of the first cemented carbide and the second cemented carbide comprises tungsten carbide particles having an average particle size of 0.3 to 1.5 μm.

21. The modular fixed cutter earth-boring bit body of claim 9, wherein one of the first cemented carbide and the second cemented carbide includes 1 to 10 weight percent more of binder than the other of the first cemented carbide and the second cemented carbide.

22. The modular fixed cutter earth-boring bit body of claim 9, wherein the hardness of the second cemented carbide is from 90 to 94 HRA and the hardness of the first cemented carbide is from 85 to 90 HRA.

23. The modular fixed cutter earth-boring bit body of claim 9, wherein the second cemented carbide comprises 6 to 15 weight percent cobalt alloy and the second cemented carbide comprises 10 to 15 weight percent cobalt alloy.

24. The modular fixed cutter earth-boring bit body of claim 1, wherein the at least one blade piece comprises at least two pieces.

25. A modular fixed cutter earth-boring bit comprising a modular fixed cutter earth-boring bit body as recited in claim 1.

26. A modular fixed cutter earth-boring bit comprising: a blade support piece;at least one blade piece fastened to the blade support piece; andat least one cuffing insert attached to the at least one blade piece.

27. The modular fixed cutter earth-boring bit of claim 26, wherein the at least one cutting insert is selected from the group consisting of a cemented carbide insert and a polycrystalline diamond compact.

28. The modular fixed cutter earth-boring bit of claim 26, wherein the at least one blade piece comprises at least one insert pocket and the at least one cutting insert is attached within the at least one insert pocket.

29. The modular fixed cutter earth-boring bit of claim 28, wherein the at least one cutting insert is selected from the group consisting of a cemented carbide insert and a polycrystalline diamond compact.

30. A method of producing a modular fixed cutter earth-boring bit body, comprising: providing a blade support piece;providing at least one blade piece; andfastening the at least one blade piece to the blade support piece.

31. The method of producing a modular fixed cutter earth-boring bit body of claim 30, wherein fastening the at least one blade piece comprises at least one of inserting the blade piece in a slot in the blade support piece, welding the blade piece to the blade support piece, brazing the blade piece to the blade support piece, soldering the blade piece to the blade support piece, force fitting the blade piece to the blade support piece, shrink fitting the blade piece to the blade support piece, adhesive bonding the blade piece to the blade support piece, attaching the blade piece to the blade support piece with a threaded mechanical fastener, and mechanically affixing the blade piece to the blade support piece.

32. The method of producing a modular fixed cutter earth-boring bit body of claim 30, wherein the at least one blade piece comprises cemented hard particles.

33. The method of producing a modular fixed cutter earth-boring bit body of claim 32, wherein the cemented hard particles are cemented carbide.

34. The method of producing a modular fixed cutter earth-boring bit body of claim 30, wherein the blade support piece comprises at least one of cemented hard particles and a steel alloy.

35. The method of producing a modular fixed cutter earth-boring bit body of claim 34, wherein the blade support piece comprises cemented carbide.

36. The method of producing a modular fixed cutter earth-boring bit body of claim 35, wherein the blade support piece consists essentially of cemented carbide.

37. The method of producing a modular fixed cutter earth-boring bit body of claim 30, wherein the blade support piece and the at least one blade piece each independently comprise a cemented carbide including particles of at least one carbide in a binder, wherein the at least one carbide is a carbide of a transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and wherein the binder comprises at least one metal selected from cobalt, nickel, iron, cobalt alloy, nickel alloy, and iron alloy.

38. The method of producing a modular fixed cutter earth-boring bit body of claim 37, wherein the binder of the cemented carbide of the blade support piece and the binder of the cemented carbide of the at least one blade piece each independently further comprise an alloying agent selected from tungsten, titanium, tantalum, niobium, chromium, molybdenum, boron, carbon, silicon, ruthenium, rhenium, manganese, aluminum, copper, vanadium, zirconium, and hafnium.

39. The method of producing a modular fixed cutter earth-boring bit body of claim 37, wherein the carbide is tungsten carbide and the binder comprises cobalt.

40. The method of producing a modular fixed cutter earth-boring bit body of claim 37, wherein providing the at least one blade piece comprises compacting a powdered metal into a green compact, machining the green compact, and sintering the machined green compact.

41. The method of producing a modular fixed cutter earth-boring bit body of claim 40, wherein providing the blade support piece comprises compacting a powdered metal into a green compact, machining the green compact, and sintering the machined green compact.

42. The method of producing a modular fixed cutter earth-boring bit of any of claims 40 and 41, wherein the powdered metal comprises a metal carbide powder and a binder powder.

43. The method of producing a modular fixed cutter earth-boring bit body of claim 30, wherein the at least one blade piece comprises multiple pieces, and wherein the method comprises fastening the multiple pieces to the blade support piece.

44. The method of producing a modular fixed cutter earth-boring bit body of claim 30, further comprising machining at least one insert pocket into the at least one blade piece.

45. A method of producing a modular fixed cutter earth-boring bit comprising: providing the modular fixed cutter earth-boring bit body recited in claim 1; andfastening at least one cutting insert to the at least one blade piece.