WO2002058927A1

WO2002058927A1 - Methods for applying wear-reducing material to tool joints

Info

Publication number: WO2002058927A1
Application number: PCT/US2002/001914
Authority: WO
Inventors: Jimmie Brooks Bolton; Billi Marie Rogers
Original assignee: Jimmie Brooks Bolton; Billi Marie Rogers
Priority date: 2001-01-25
Filing date: 2002-01-23
Publication date: 2002-08-01
Also published as: WO2002058927A8

Abstract

A method for applying wear-reducing material (78) to a tool joint (76) useful in a wellbore in drilling operations, the method, in at least certain aspects, including positioning the tool joint (76) adjacent laser beam apparatus (79), delivering wear-reducing material (78) to a location on the tool joint (76) to which the wear-reducing material (78) is to be applied, heating the wear-reducing material (78) with the laser beam apparatus (79) to a temperature not exceeding its melting temperature so that the wear-reducing material (78) is welded to the tool joint (76) . In one particular aspect, a defocused laser beam (80) is used to achieve desired heating temperatures; and in one aspect, defocusing the laser so no plasma is formed.

Description

METHODS FOR APPLYING WEAR-REDUCING MATERIAL

TO TOOL JOINTS

BACKGROUND OF THE INVENTION Field Of The Invention

The present invention is directed to improved tool joints used in wellbore operations; such tool joints that have wear-reducing material applied thereto, including, but not limited to hardfacings and carbides; and methods for applying such materials to tool joints .

Description of Related Art

"Thermal spraying" refers to a variety of processes for depositing both metallic and non-metallic materials on a substrate to form a coating. Metals, cermets, ceramics, plastics and mixtures thereof in the form of powders, rods or wires may be used as coating material. Heat for melting the material is supplied by electric arc, plasma arc, or combustible fuel gases and compressed air or process gases form an accelerated stream of molten coating material. The material builds up on the substrate and cools to form the coating.

Electric arc spray processes use electrically charged wire which is fed by a wire feeder to an arc spray gun in which the wires converge, arc, and melt in a high temperature zone (e.g. 15,000 degrees F. or higher) created by the arc.

In certain known drilling operations in drilling for oil and gas, a drill string of pipe is used that is secured together by tool joints on which are rings of hardfacing applied for abrasion resistance. Drill collars and a drill bit are connected to the insertion end of the string. A "cased wellbore" is one in which a casing having an inside diameter adequate for passage of the drill string with tool joints, collars and bit is put in place. The rotating action of drilling causes severe wear on the tool joints. As drilling proceeds, the tool joints rub against the drilled hole

BOLT CIP and/or against the drilled hole lining ("casing").

One current prior art practice is to weld a cladding on the exterior diameter of the tool joint. The cladding is a material that will resist abrasion caused by the rubbing action against the earthen wall of the hole or the steel casing.

SUMMARY OF THE PRESENT INVENTION

In certain embodiments the present invention discloses methods for the laser application of wear-reducing material (e.g., but not limited to, extremely fine carbides) to all or part of a tool joint. In certain methods according to the present invention, wear-reducing materials are applied to a tool joint with heating apparatus so that the melting temperature of the material is not exceeded, thus reducing problems associated with melted materials that go into solution with matrix material that contains the wear- reducing material and/or with the material of the tool joint itself. In certain aspects of the present invention, a laser beam of a heating apparatus is defocused to reduce the temperature of the heat applied by the laser. In certain preferred aspects, a defocused laser beam, even though operating in a gas envelope, forms no plasma and application temperature achieved are well below that of current prior art welding technologies, as described above. The temperature is, preferably, such that fine particles, e.g., fine carbides (e.g., with a largest dimension of up to about 120 microns) are not melted and remain intact through the laser process. This allows the use of fine particles that are much less aggressive to steel and other metals than the large particles. By achieving close spacing of the fine particles in a resulting cladding (e.g., within 40 microns apart), an extremely wear resistant cladding is produced. In certain methods according to the present invention, dilution of applied material is 5% or less and in certain preferred embodiments this dilution is 2% maximum. Also the chemistry of alloys used in a matrix to hold the wear- reducing material is maintained to a greater extent than with certain prior art processes. In certain methods according to the present invention, the material applied to a tool joint is in a matrix of materials that has a low coefficient of friction. A laser of a laser application apparatus is, preferably, controlled in a manner so as not to melt the material and to place it into a solid-state solution to form an alloy with the matrix and/or with the material of the tool joint. In certain aspects placing the material in solution with the suspension matrix changes the cladding's coefficient of thermal expansion and causes cracking to occur in the clad deposit. In one aspect according to the present invention the cracking is desirable to provide a stress-relief structure and the amount of cracking in the cladding is controlled by not putting carbides used in the cladding in solution in a random and uncontrolled manner and by engineering a matrix to crack in a pre-determined way to a predetermined extent with cracks having predetermined dimensions [well known in the art (see, e.g., U.S. Patents 5,224,559 and 5,350,560 incorporated fully herein for all purposes - which patents neither teach nor suggest laser application of materials as disclosed herein)].

In certain embodiments, an alloy or composite wear-reducing material of predetermined properties and elements is applied to a drill pipe tool joint, utilizing a high-density heat source, such as a laser beam of a laser system. The laser beam provides controlled and concentrated energy, embedding carbides of fine particle size in a metal matrix with minimal degradation of the carbides. Various laser systems are commercially available, including, but not limited to, those that use lasers from the Rofin-Sinar Co. of Hamburg, Germany and from LaserLine GmbH of Koblenz, Germany; and controls from the Siemens Co. or the GE - Finuc Co. Such a laser system can place an amount of wear-reducing material accurately and control the deposit depth, allowing reproducible wear-reducing materials or hardfacings with minimal base metal dilution. The minimal admixture of the base material permits an extremely accurate pre-engineering of the matrix chemistry, allowing customization of the material and tailoring the tool joint to address drilling needs, such as severe abrasion, erosion, and corrosion, as seen, e.g., in open hole drilling conditions. It also permits modification of the deposit to adjust to coefficient of friction needs in metal-to-metal friction, e.g. as encountered in rotation of the drill string within the casing. In certain aspects the deposited material is modified by replacing galling material, e.g., iron and nickel, with non-galling elements, such as e.g., but not limited to, molybdenum, cobalt and chromium and combinations thereof.

In certain preferred embodiments, the admixture of the applied material to the base material is minimized and the resulting bond is a true metallurgical bond. Any suitable wear-reducing material may be applied by methods according to the present invention, including, but not limited to those disclosed in and referred to in U.S. Patents 5,051,112; 4,243,727; 5,224,559; and 5,350,560 and those referred to in prior art cited in these patents - all of which are incorporated herein fully for all purposes.

The present invention, in certain aspects, discloses a wire for thermal spraying that includes: 1. copper and/or copper alloy and 2. aluminum and/or aluminum alloy and/or zinc and/or zinc alloy. In one aspect such a wire has an outer sheath of pure aluminum (e.g. 1100 type aluminum) or of aluminum alloy. The outer sheath may, e.g., be made of materials as in Table I. In certain aspects the aluminum alloy contains at least 95% aluminum by weight. The wire, in certain aspects, has a core of pure copper or of copper alloy including, but not limited to copper alloyed with tin, zinc, nickel, manganese, iron and/or silicon. In certain aspects the copper alloy contains at least 80% copper by weight. The core may be made, e.g., of the materials in Table II.

The sheath, in certain aspects, has a thickness ranging between 0.010 inches and 0.020 inches for a wire, e.g., of 1/16 inches in diameter. The sheath for a wire of about 3/16 inches in diameter ranges between 0.010 inches and 0.150 inches thick. By weight the total material of the core, in certain embodiments, ranges between 1% and 60% of the wire's total weight. By weight the sheath, in certain embodiments, ranges between 40% and 99% of the total wire weight. The core may include both copper and copper alloy with copper present in a range of 1% to 60% by weight and copper alloy present in a range of 1% to 60% by weight of the total core weight. The sheath may include both aluminum and/or zinc and aluminum alloy and/or zinc alloy in a range of 40% to 99% by weight of the total sheath weight.

The core may be in powder form or it may itself be a solid wire. In certain embodiments the sheath as described above is made of zinc, zinc alloy, aluminum or aluminum alloy. In other aspects the sheath is made of a combination of any two or more of these materials. The sheath may be made, e.g. of any of the materials in Table III or of a combination of any two or more of them.

In certain embodiments, the wire is made by enclosing the core in the sheath. This can be done by any of the well-known cored wire making processes. Typical sheathed wire or core wire forming processes are disclosed in U.S. Patents 3,777,361; 3,648,356; 3,631,586; 3,600,790; 3,436,248; 4,013,211; and the prior art cited in these patents — all of which are incorporated fully here for all purposes.

In other embodiments a wire according to the present invention is made by melting and combining the core material and sheath material to produce a solid combination of the two, in one aspect in the form of rods, and then extruding a wire of suitable diameter from the rods.

In other embodiments, a wire (or strand, filament) or wires of core material is twisted together with a wire or wires of sheath material to form a multi-component wire which has no outer sheath. Alternatively, such a multi-component wire may have an outer sheath of sheath material. DESCRIPTION OF THE DRAWINGS

A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments.

Fig. 1A shows schematically a process for forming a wire according to the present invention as shown in cross-section in Fig. 1B.

Fig. 2A shows schematically a process for forming a wire according to the present invention as shown in cross-section in Fig. 2B.

Fig. 3 is a cross-section view of a wire according to the present invention.

Fig. 4 shows schematically a process for applying a coating to a marine vessel with wire according to the present invention.

Fig. 5A is a side view and Fig. 5B is an end view of a tool joint according to the present invention.

Fig. 6A is a side view and Fig. 6B is an end view of a tool joint according to the present invention.

Fig. 7 presents Table I. Figs. 8A - 8E present Table II. Fig. 9 presents Table III.

Fig. 10 shows a variety of patterns, designs and shapes for wear-reducing material applied on tool joints according to the present invention.

Fig. 11 shows schematically apparatus useful in methods according to the present invention.

Fig. 12 shows a tool joint pin end being treated according to the present invention.

Fig. 13 shows partially a tool joint box end being treated according to the present invention. DESCRIPTION OF EMBODIMENTS PREFERRED AT THE TIME OF FILING FOR THIS PATENT

As shown in Fig. 1 , a solid wire 12 of copper, of copper alloy, or of a combination of copper and copper alloy is to be enclosed in an outer cladding or sheath 14 of aluminum, aluminum alloy, or a combination of the two. Any suitable known process for forming the resultant wire 10, Fig. 1B, may be used. In one aspect a known tube mill process is used to form a flat strip into a tube around a core, either powdered or solid.

In another aspect as shown in Figs. 2A and 2B, an amount of powder 22 of copper, copper alloy, or both is used to form the core of a wire 20 that has an outer cladding or sheath 24 of aluminum, aluminum alloy, zinc, and/or zinc alloy. It is within the scope of this invention to feed core material powder and sheath material powder to a spray apparatus instead of feeding wire.

Fig. 3 shows a wire 28 according to the present invention which is formed by melting aluminum (and/or aluminum alloy), adding and melting copper (and/or copper alloy) to the aluminum melt, and forming rods which are then used to extrude the wire 28. Any suitable known wire forming or extrusion system may be used.

Fig. 4 shows schematically a method for applying a coating to an object using a wire according to the present invention. A thermal spray system 30 employing one, two, or more wires according to the present invention sprays a coating onto the hull 31 of a vessel 32. Preferably such a coating according to the present invention will range between 0.005 inches and 0.125 inches thick, although it is within the scope of this invention to employ coatings that are thinner or thicker. In one aspect a known twin wire arc spray system is used. Any object or item, including, but not limited to, boats, hulls, piers, docks, structures, buoys, cables, anchors, and any object or item subject to damage by marine growth may be coated according to the present invention.

When used as a coating for items or objects in a marine environment according to the present invention, the aluminum and/or aluminum alloy and/or zinc and/or zinc alloy in the coating acts as a cathode to produce a cathodic effect that inhibits corrosion. The copper or copper alloy acts as a biocide for marine growth such as barnacles, algae, and coral.

Figs. 5A and 5B show a tool joint 50 with a coating 51 (which may be any coating according to the present invention) according to the present invention. It is within the scope of the present invention to coat the entire exterior surface of the tool joint 50 (or any tool joint shown or described herein) or only a portion thereof. The entire outer surface of the tool joint may be coated. In one particular aspect only the area "R" or "S" is coated according to the present invention. Alternatively, although not a legal equivalent of the spraying described herein, the tool joint 50 may have wear-reducing material applied to it or be "hardfaced" with the patterns or designs disclosed herein employing any suitable known hardfacing process or by using methods according to the present invention. A drill pipe tool joint is the mechanism used to join the drill string together. One end is a male fitting called in the trade a "pin." The other is a female fitting called the "box" into which the pin screws. The joint is larger in diameter than the tube itself. When the two parts join together by threads, they form an assembly that must have greater tensile and fatigue strength than the tube body. In use the tool joint rubs against the drilled wall of a hole or against steel casing in the hole.

According to certain aspects of the present invention extremely fine carbides in a matrix of materials that has a low coefficient of friction are applied by a laser system whose laser apparatus is controlled in a manner so as not to melt the carbides and place them into a solid-state solution so as not to form an alloy with the matrix. Placing the carbides in solution with the suspension matrix changes the cladding's coefficient of thermal expansion and causes cracking to occur in the clad deposit. In one aspect according to the present invention the amount of cracking in the cladding is limited to keep foreign substances from penetrating the base metal.

In one aspect the carbides used are of any of the refractory carbide groups and combinations of the carbides, which become complex carbides, including but not limited to, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten and the combinations of any or all of these. In one aspect the general geometric shape of the particles is spherical, but potato-shaped and angular-shaped can be used. The carbides may be held together with a binder such as cobalt, nickel, iron, or chromium, or can be used without a binder. The matrix that holds the carbides in place is, in one aspect, a good wear resistant material itself. It may be a cobalt-based material, such as Stellite, or a nickel based material, such as Colmonoy, or may be an iron based material, such as a high chromium iron. In one aspect the bands of the cladding extend for 4-6 inches along the axis of the pipe on the box and 3-5 inches along the pin.

Figs. 6A and 6B show a tool joint 60 with a coating 61 according to the present invention. It is within the scope of the present invention to coat the entire exterior surface of the tool joint 60 or only a portion thereof.

Laser methods of application according to certain embodiments of the present invention apply wear-reducing material (e.g., carbides and hardfacing) without undesirable levels of alloying with matrix material and/or with metal from a tool joint and, preferably, yield a deposit with less than 5% of such alloying (dilution) and, in certain preferred embodiments, 2% or less of such alloying (dilution). Such methods permit the control of repetitive applications within ± 0.020 inch thickness and ± 0.030 inch placement and produce a metallurgical bond between the base metal of the tool joint and the wear-reducing material. Also, such methods allow base material to retain its integrity, as a result of which the material applied with the laser more accurately retains its engineered properties. Thus coatings according to certain embodiments of the present invention are engineered to fit a specific need, e.g., but not limited to, maximum abrasive wear resistance, maximum erosive wear resistance, and modified coefficient of friction as needed to achieve desired end results for tool joint service.

The laser application apparatus used in methods according to certain embodiments of the present invention permits the use of alloys and elements previously difficult-to-impossible to apply - including the iron-dominant, nickel-dominant, and cobalt-dominant families of materials. In certain aspects, the alloying elements for the three dominant elements (iron, nickel, and cobalt) in a range of 5-35% are chromium, manganese, molybdenum, vanadium, and tungsten. The alloying elements in a dominant element range of 0- 5% are boron, carbon, aluminum, titanium, zirconium, tantalum, sulfur, silicon, phosphorus, bismuth, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. Methods according to the present invention using laser application apparatus also permit application of composite coatings comprised of the carbides, borides, suicides, and nitrides as hard particles and held in place by the aforementioned alloys. These refractory materials include, but are not limited to, the following: carbides: titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, chromium carbide, molybdenum carbide, and tungsten carbide. nitrides: titanium nitride, zirconium nitride, hafnium nitride, vanadium nitride, niobium nitride, tantalum nitride, chromium nitride, molybdenum nitride, and tungsten nitride. borides: titanium boride, zirconium boride, hafnium boride, vanadium boride, niobium boride, tantalum boride, chromium boride, molybdenum boride, and tungsten boride. suicides: titanium suicide, zirconium suicide, vanadium suicide, niobium suicides, tantalum suicide, chromium suicide molybdenum, and tungsten suicide. Using a laser apparatus in certain methods according to the present invention with a laser as heat source, wear-reducing material is applied to the outer diameter of the box and pin and, due to the precision afforded by the laser uniform coating thickness is achieved on both box and pin, and thus the tool joint wears uniformly down hole.

In certain prior art hardfacing methods material has traditionally been welded on tool joints in rings around their circumference. Laser-applied materials according to the present invention may be applied insuch rings, but it is also within the scope of the present invention to apply material in any shapes, lines, designs and/or patterns, for example, a series of lines, shapes, spots, "X's," or diagonal strips or lines to enhance control of down hole hydraulics. Fig. 7 shows a variety of such patterns, etc. with locations of wear-reducing material indicated by "WR." By providing wear-reducing material in separate, defined spaced-apart areas, fluid flow in a wellbore annulus past a tool joint is enhanced, i.e., flow between deposit areas is facilitated.

In certain aspects, in a method according to the present invention a tool joint's exterior surface may or may not have a groove to receive the wear-reducing material. In one aspect such a tool joint is made of material that is of low alloy composition e.g. but not limited to commercially available A1S1 4137, and heating prior to welding is preferable to reduce the need for a rapid quench (in such steel a rapid quench can elevate hardness above a desired level) and reduce the hardness of the heat affected zone. Preheating modifies the quench level and yields a more nearly normal hardness. The material quenches, in certain aspects, rapidly enough so that it transitions to martensite. In certain aspects a tool joint is, according to the present invention, quenched and tempered to a Brinell hardness between 284 and 342. Application of material on a non-preheated joint can result in a Brinell hardness that is too high, e.g., in excess of 400, which can cause crack propagation into a tool joint's base material. Using a preheat can reduce or eliminate such unwanted crack propagation.

Preferably an engineering schedule is organized which for such a method ("hard banding") includes rate of powder delivery, laser intensity, speed of travel of tool joint under a laser, number of passes and number of layers, and application layout. With certain laser systems, following such pre-engineering, actual application is automatically controlled when the raw tool joint is placed in position. The process is completed with controlled cooling to reduce stresses.

In one particular method according to the present invention an engineering schedule is prepared for a tool joint to be treated. For a typical tool joint made of A1S1 4137, 20 inches long, with a wall thickness of 1 - 5 inches, the "powder" delivery rate is 110 grams per minute; the "powder" or cladding material is 65% by weight spherical cast tungsten carbide with a size between 80 and 250 mesh and 35% by weight matrix material which is nickel-chrome -boron silicon with a hardness of 40RC; the laser intensity is set at 6 kilowatts; the speed of travel is 45" per minute with an overlap between passes of 0.110", yielding a deposit of approximately 0.070" thick and a deposit on the tool joint that is 3.75" long. With this pre-engineering, actual application is automatically controlled when the raw tool joint is placed in position. The resulting applied material is of low alloy composition, and in this particular embodiment the tool joint is preheated (e.g. to 850 degrees F.) in order to reduce the rapid quench and reduce the hardness of the heat affected zone. The clean (preferably) preheated tool joint (which may or may not have a groove to receive the cladding material) is placed into a fixture manipulator that rotates the tool joint about its axis under the laser beam. The fixture may also, as desired, translate the tool joint parallel with its axis. The powder (the cladding material and/or hardfacing alloy) may be delivered either by coaxial feed or side delivery (both well known in the prior art). Coaxial feed is a feed that the powder flows into a laser light stream above the work piece. The powder is heated to slightly above its molten temperature (e.g. to 2150 degrees F.) as it is carried downward by gravity. The laser, in addition, heats the tool joint base material to a near molten state in preparation to receive the powder, now heated to a molten state and application occurs. In a the side delivery method, the powder is injected into the laser light beam in close proximity to the surface of the tool joint. The light melts the powder and also brings the tool joint surface to application temperature. Preferably, in both cases an inert gas is used to shield the heated materials to inhibit or prevent oxidation. In one aspect, helium is used.

One laser machine used in a method according to the present invention is a Rofin-Sinar model 860, C02 laser. In one particular aspect, the machine is de-focused so that no plasma is formed, e.g., in one aspect to an oval spot of approximately 6 millimeters X 8 millimeters. By contrast, a focused spot would be 0.05 mm by 0.05 mm which would cause a plasma to form with its corresponding undesirable high temperature. Using 6500 watts of power output and 60 - 70 grams of powder per minute, the machine deposits material 1.5 millimeters thick in an oval shape (e.g. as in Fig. 7) at 1500-2000 millimeters per minute. Continuous passes overlap the previous pass by approximately two-thirds the width of the pass.

One present industry accepted standard for width of hard facing is 3 3/4" around the circumference of a box tool joint with 3/4" of the material deposited in a groove (about 0.080 inches deep) so that it becomes flush with a rig's elevator's shoulder, so that the tool joint does not hang up when the pipe is handled with the elevator. A width of 3" of material is applied on the outer diameter, either in a groove so that it is flush, or "proud", i.e. projecting above the surface of the tool joint up to 0.250 inches. The pin end of the tool joint may or may not be clad or hardfaced; but if desired, and/or when requirements dictate, a band of material is applied to the outer diameter which, in one particular aspect, is about 2" wide. Patterns designed with spaced-apart areas of deposited wear-reducing material to enhance hydraulic properties are easily achieved with a computer-programmed laser. The tool joint may be cooled to ambient temperature by letting it sit until cooled or, according to the present invention, cooling is controlled to reduce stresses. Two particular methods for cooling are burying the tool joint in vermiculite, and conveying the tool joint through a cooling apparatus such as a cooling oven.

Fig. 11 shows schematically a tool joint 70 being treated with wear-reducing material 71 by a method according to the present invention (including, but not limited to, by any method described above for applying wear-reducing material to a tool joint) using a laser apparatus 72 with optics apparatus 73 producing a defocused laser beam 74. A typical workpiece manipulator 75 holds, manipulates, and rotates the tool joint 70 beneath the laser apparatus 72.

As shown in Fig. 12, a tool joint 76 has a pin end 77 to which wear-reducing material 78 is applied by a laser apparatus 79 with a defocused beam 80. As shown in Fig. 13, a tool joint 81 has a box end 82 (shown partially) to which wear-reducing material 83 is applied by a laser apparatus 84 with a defocused beam 85. Any method and/or apparatus according to the present invention can be used for the applications of Figs. 12 and 13.

What is claimed is:

Claims

CLAIMS : 1. A method for applying wear reducing material to a tool joint useful in a wellbore in drilling operations, the method comprising positioning the tool joint adjacent laser beam apparatus, delivering wear-reducing material to a location on the tool joint to which the wear-reducing material is to be applied, the wear-reducing material having a melting temperature, and heating the wear-reducing material with the laser beam apparatus to a temperature not exceeding the melting temperature of the wear-reducing material thereby welding the wear-reducing material to the tool joint.

2. The method of claim 1 wherein the wear—reducing material is heated with a laser beam that is defocused so that the melting temperature of the wear-reducing material is not exceeded.

3. The method of claim 1 wherein the tool joint is made of tool joint material and the wear-reducing material is heated with a laser beam that is defocused so that the tool joint material is not melted.

4. The method of claim 1 wherein the wear-reducing material is applied in a pattern of intermittent spaced-apart areas of wear- reducing material.

5. The method of claim 4 wherein the intermittent spaced- apart areas of wear reducing material provide fluid flow paths therebetween for enhancing fluid flow past the tool joint when it is within a wellbore.

6. The method of claim 1 further comprising applying the wear-reducing material to the tool joint so that cracks are formed in the wear-reducing material for reducing stress in the applied wear-reducing material.

7. The method of claim 1 wherein the laser beam apparatus is defocused so that no plasma is formed adjacent the tool joint.

8. The method of claim 1 wherein the wear-reducing material is applied with a substantially uniform thickness to the tool joint.

9. The method of claim 9 wherein the thickness varies between ± 0.020 inches.

10. The method of claim 1 wherein a metallurgical bond is formed between the wear-reducing material and the tool joint.

11. The method of claim 1 wherein the wear-reducing material includes carbides.

12. The method of claim 2 wherein the carbides are in a matrix of wear resistant material

13. The method of claim 1 wherein the tool joint is made of base metal and there is less than 5% dilution of the base metal by the applied wear-reducing material.

14. The method of claim 1 wherein the tool joint is made of base metal and there is less than 2% dilution of the base metal by the applied wear-reducing material.

15. The method of claim 1 wherein the wear-reducing material is combined with friction reducing material.

16. The method of claim 1 wherein the wear-reducing material is from the group consisting of carbides, borides, silicides, and nitrides.

17. The method of claim 1 wherein the wear-reducing material is alloyed with an alloying element from the group consisting of chromium, manganese, molybdenum, vanadium, boron, carbon, aluminum, titanium, zirconium, tantalum, sulfur, silicon, phosphorus, bismuth, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

18. A method for applying wear reducing material to a tool joint useful in a wellbore in drilling operations, the method comprising positioning the tool joint adjacent laser beam apparatus, 6 delivering wear-reducing material to a location on

7 the tool joint to which the wear-reducing material is to be

8 applied, the wear-reducing material having a melting

9 temperature,

Lo heating the wear-reducing material with the laser

Li beam apparatus to a temperature not exceeding the melting

L2 temperature of the wear-reducing material thereby welding the

L3 wear-reducing material to the tool joint,

L4 wherein the laser beam apparatus is defocused so

L5 that no plasma is formed adjacent the tool joint,

.6 wherein the wear-reducing material is applied with

.7 a substantially uniform thickness to the tool joint,

.8 wherein a metallurgical bond is formed between the

.9 wear-reducing material and the tool joint,

0 wherein the wear—reducing material includes i carbides,

2 wherein the carbides are in a matrix of wear

3 resistant material, and

4 wherein the tool joint is made of base metal and

5 there is less than 5% dilution of the base metal by the

6 applied wear-reducing material.

1 19. A tool joint to which wear-reducing material has been

2 applied by a method for applying wear-reducing material, the method

3 comprising positioning the tool joint adjacent laser beam

4 apparatus, delivering wear-reducing material to a location on the

5 tool joint to which the wear-reducing material is to be applied,

6 the wear-reducing material having a melting temperature, and

7 heating the wear-reducing material with the laser beam apparatus to

8 a temperature not exceeding the melting temperature of the wear-

9 reducing material thereby welding the wear-reducing material to the

0 tool joint.

1 20. A method for applying wear reducing material to a tool

2 joint useful in a wellbore in drilling operations, the method

3 comprising positioning the tool joint adjacent laser beam apparatus, delivering wear-reducing material to a location on the tool joint to which the wear-reducing material is to be applied, and heating the wear-reducing material with a defocused laser beam of the laser beam apparatus thereby welding the wear-reducing material to the tool joint.

21. A method for thermal spraying, the method comprising spraying a coating onto an object with a thermal spray system, the thermal spray system using wire to produce the coating, the wire comprising sheath material and core material, the core material acting as a biocide for marine growth and the sheath material acting as a cathode.

22. A wire for use in thermal spraying, the wire comprising aluminum material, and copper material.

23. An object coated with a thermally sprayed-on coating, the spraying done by spraying a coating onto an object with a thermal spray system, the thermal spray system using source material to produce the coating, the source material comprising material acting as a cathode and material acting as a biocide.

24. A method for thermal spraying, the method comprising spraying a coating onto an object with a thermal spray system, the thermal spray system using powder to produce the coating, the powder comprising first material and second material, the second material acting as a biocide for marine growth and the first material acting as a cathode.

25. Any patentable invention disclosed herein.