WO2003029604A1 - Prevention of bit balling by metallic coasting - Google Patents
Prevention of bit balling by metallic coasting Download PDFInfo
- Publication number
- WO2003029604A1 WO2003029604A1 PCT/NO2002/000358 NO0200358W WO03029604A1 WO 2003029604 A1 WO2003029604 A1 WO 2003029604A1 NO 0200358 W NO0200358 W NO 0200358W WO 03029604 A1 WO03029604 A1 WO 03029604A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drilling
- drilling tool
- coating
- steel
- bit
- Prior art date
Links
- 230000002265 prevention Effects 0.000 title description 3
- 238000005553 drilling Methods 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000000470 constituent Substances 0.000 claims abstract 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000004927 clay Substances 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000009713 electroplating Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
Definitions
- the invention relates to an improvement on drilling tools as stated in the introduction of claim 1 , for drilling in masses containing clay and similar substances.
- clay layers carry an overall negative charge arising from isomorphous substitution of Mg and Fe for Al in the octahedral sheet and. to a lesser extent, substitution of Si in the tetrahedral sheet by Al.
- the negative charges on the layers are balanced by hydrated cations in the interlamellar space (usually Na + and Ca 2+ in the natural form). These cations can readily be exchanged.
- bit balling is initiated when there is no mudflow. This happens whenever there is a need to add or remove a drill string during drilling.
- the negatively charged clay tends to release their electron through the metal-made drill bit that is electro-conductor.
- electrostatic adhering force between clays and drill bit. Under normal drilling process, mudflow tends to remove clays from bit surface. It is a matter of which of these two contracting forces is stronger. When mudflow stops running, the electrostatic force will introduce clays to stick on the bit surface. Once initiated, it is easier for clays to quickly build up thick layer on bit surface and ball up drill bit.
- Rough bit surface especially an a matrix drill bit, increases the surface area, and thus increase the adhering forces. This results in easier balling of matrix bits than steel bits, which is a well-known fact in oil drilling industry.
- the wetability of water based mud and water-wetted 'sticky clays' on bit surface is also an important fact that promotes balling.
- the Baroid-patentet does not show any measurement of electropotential differences among the steel, nitrided steel and galvanized steel. It is therefore questionable that is there any lasting significant potential difference compared to untreated steel. The known process are thus deemed unsuitable for practical use, particluarly in offshore drilling.
- the main object of the invention is to provide a drilling tool and a method of preparing such a tool, which can be prepared respectively practiced more easily and give a more durable and effective drilling tool that prior art.
- a particular object is to provide a process enabling a selective treatment of the different parts of the drilling tool, to optimize the repelling of the clay and mud. It is also an object to provide a method which can be used for drilling heads of other material than steel.
- the main solution to reduce the tendency of bit balling are thus to establish a negative metal layer or coating on the drilling bit surface.
- This layer has a negative electrochemical potential when compared with the underneath bit body, either a steel bit or a tungsten carbide matrix bit. This negatively charged layer would not adhere but expel the negatively charged clays.
- Nickel-based alloy is a simple, quick and economic coating that achieves excellent results in terms of prevention of bit balling.
- Chromium-base alloy has more negative electro-chemical potential and higher wear resistance.
- Abrasive particles such as silicon carbide, tungsten carbide and diamond powder can be incorporated into the above-mentioned alloy by the well-known composite platting method to further improve the wear resistance of the coating.
- Bimetallic layers built an electro-potential field with negative layer on bit surface to expel the negatively charged sticky clays, and positive portion inside bit
- the coated layer has mirror-like surface finishing This tremendously reduces the surface area and the flow resistance This means improvement of drilling performance Allow incorporation of abrasive particles in the coated layer to increase working life of
- the present invention provides following advantages 1
- Present invention can be used for every type of steel and matrix drill bits and other downhole tools
- the US patent can only apply to steel bit and steel-made tools 2
- Low temperature and short process time compared to US patent Nickel and chromium coating are normally undertaking at temperatures below 60°C
- One millimetre thick layer can be easily built up within 5 hours
- the gas mt ⁇ ding process used in US patent require temperatures over 500°C and processing times of 50 to 200 hours to reach 0 5 to 1 0 mm case depth on steel 3
- Low temperature process of present invention does not damage any other elements on the drill bits and other drilling tools
- the parts which is undesirable to be coated e g the PDC
- the coated layer of present invention has higher wear resistance than the nit ⁇ ding layer used in US patent
- the wear resistance of bit surface is important for successful drilling Once the negative layer wearied out, the drill bit loses the resistance to
- the coated layer of present invention can be easily built up to 10 mm thick, if desired, with perfect surface finishing 6
- Present invention allows incorporation of abrasive particles in the coated layer This further improves the wear resistance of the negative layer on bit surface, and thus increases the working life of 'anti-balling' bit 7.
- the potential difference between the coated layers, steel and matrix bit bodies can be measured.
- Nickel-based alloy coating and tungsten carbide matrix bit shows 0.35 V in potential difference, with coating more negative, when they were dipping into a water- wetted sticky clay from North Sea.
- the steel bit shows 0.52 V more positive than the nickel coating.
- Fig. 1 is showing a part of a drilling head with drilling bits in perspective view, while
- Fig. 2 is showing schematically the surface of a drilling bit, to illustrate the mechanism of the invention.
- a drilling head 1 1 of known design with a sperical end 12 is provided with eigth radially protruding and helically extending ribs 13 distributed around the end 12.
- Each rib 13 is carrying a row of drilling bits 14.
- the drilling bits 14 may be of steel or matrix (e.g. tungsten carbide), with a coating of polycrystalinic diamond (PCD) (not shown).
- PCD polycrystalinic diamond
- the interspaces 15 between the ribs 13 makes flow areas for drilling mud supplied to the drilling head 1 1. Drilling tools of this kind are described in several sources.
- a section of a drilling bit 14 is shown with an enlarged layer or coating 16 of a nickel alloy.
- Nickel-based alloys can be deposited by electroplating in a rapid and easy process and provide excellent results.
- the negatively charged coating 16 will expell negatively charged clay 17 or similar material.
- chromnium alloy may be used for the coating 19.
- Chromnium alloy has a more negative tension and a higher abrasive resistance, but is mor difficult to coat.
- Abrasive particles such as silicium carbide, tungsten carbide and diamond powder, may be included in the coating during electroplating.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A matrix or steel based drilling tool, particularly a drilling head for drilling in constituents disposed to stick to the tool, with a surface which for at least a subtantial part being transformed to increase the (negative) electrochemical potential of the surface compared to the adjoining parts of the drilling tool. A coating (16) is provided, comprising a material being at a more negative electrochemical potential than steel and/or than the bounding alloys used in matrix bits (14)(e.g. tungsten carbide).
Description
Prevention of Bit Balling by Metallic Coasting.
The invention relates to an improvement on drilling tools as stated in the introduction of claim 1 , for drilling in masses containing clay and similar substances.
Background
On drilling in masses containing clay, the drilling tools are frequently subject to clogging or balling. When the drilling head penetrates water reactive clay formations using water based drilling mud, sticky clay will adhere to the drilling bit. This reduces the drilling performance, reduces or stops the mud circulation, creates logging difficulties and in general, tremendously increased drilling costs.
It is known that clay layers carry an overall negative charge arising from isomorphous substitution of Mg and Fe for Al in the octahedral sheet and. to a lesser extent, substitution of Si in the tetrahedral sheet by Al. The negative charges on the layers are balanced by hydrated cations in the interlamellar space (usually Na+ and Ca2+ in the natural form). These cations can readily be exchanged.
There are two major mechanisms, mechanical and chemical, that contribute the sticky clay to ball up drill bit. It is not known which factor is more important, and which initiates the balling.
Based on experiences in manufacturing drill bits and studying their drilling performance in water-based mud, it is strongly believeed that bit balling is initiated when there is no mudflow. This happens whenever there is a need to add or remove a drill string during drilling. The negatively charged clay tends to release their electron through the metal-made drill bit that is electro-conductor. There exist an electrostatic adhering force between clays and drill bit. Under normal drilling process, mudflow tends to remove clays from bit surface. It is a matter of which of these two contracting forces is stronger. When mudflow stops running, the electrostatic force will introduce clays to stick on the bit surface. Once initiated, it is easier for clays to quickly build up thick layer on bit surface and ball up drill bit.
Rough bit surface, especially an a matrix drill bit, increases the surface area, and thus increase the adhering forces. This results in easier balling of matrix bits than steel bits, which is a well-known fact in oil drilling industry. The wetability of water based mud and water-wetted 'sticky clays' on bit surface is also an important fact that promotes balling.
The problem is treated in US-patent specification 5,330,016 (Baroid). This publication describes a proposal to avoid the problem. It proposes to provide a electronegative surface by a gas nitriting prosess.This process is demanding and time consuming. It is conducted at a temperature of over 500°C. To provide a nitriting depth of 0,5 til 1 mm, a processing time of
50 to 200 hours is necessary. For practical reasons, the depth will be in the order of lOmy. This makes the nitrite steel layer subject to damage by abrasion by drilling fluid and totally lose the ability to prevent balling.
The known process is described to be applied on steel bits only. It is well known that the matrix bits (tungsten carbide powder bounded by metal alloys) have much higher possibility to be balled-up by clays than the steel bits.
The Baroid-patentet does not show any measurement of electropotential differences among the steel, nitrided steel and galvanized steel. It is therefore questionable that is there any lasting significant potential difference compared to untreated steel. The known process are thus deemed unsuitable for practical use, particluarly in offshore drilling.
Object
The main object of the invention is to provide a drilling tool and a method of preparing such a tool, which can be prepared respectively practiced more easily and give a more durable and effective drilling tool that prior art.
Most crucial are the non-balling, the durability, and the effectiveness of the drilling tool. A particular object is to provide a process enabling a selective treatment of the different parts of the drilling tool, to optimize the repelling of the clay and mud. It is also an object to provide a method which can be used for drilling heads of other material than steel.
The Invention
The invetion is primarily described in claim 1.
The main solution to reduce the tendency of bit balling are thus to establish a negative metal layer or coating on the drilling bit surface. This layer has a negative electrochemical potential when compared with the underneath bit body, either a steel bit or a tungsten carbide matrix bit. This negatively charged layer would not adhere but expel the negatively charged clays.
There are two metal candidates which have been selected and practised for this purpose. Nickel-based alloy is a simple, quick and economic coating that achieves excellent results in terms of prevention of bit balling. Chromium-base alloy has more negative electro-chemical potential and higher wear resistance.
Abrasive particles, such as silicon carbide, tungsten carbide and diamond powder can be incorporated into the above-mentioned alloy by the well-known composite platting method to further improve the wear resistance of the coating.
Bimetallic layers built an electro-potential field with negative layer on bit surface to expel the negatively charged sticky clays, and positive portion inside bit
Theoretically, whole drill string, from the pipe on earth surface and down to the bottom drill bit can be coated with a negative layer, and reduce the tendency of mud balling on whole drill string There is no need to provide 'sacrificial anode' on tool surfaces toward sediments to encouraging mud balling on this area as implemented in US patent
No matter how rough the surface of matrix bit or steel bit before coating, the coated layer has mirror-like surface finishing This tremendously reduces the surface area and the flow resistance This means improvement of drilling performance Allow incorporation of abrasive particles in the coated layer to increase working life of
'anti-balling' drill bits and other downhole tools
Compared to the proposal of US-patentskπft 5,330,016, the present invention provides following advantages 1 Present invention can be used for every type of steel and matrix drill bits and other downhole tools The US patent can only apply to steel bit and steel-made tools 2 Low temperature and short process time compared to US patent Nickel and chromium coating are normally undertaking at temperatures below 60°C One millimetre thick layer can be easily built up within 5 hours The gas mtπding process used in US patent require temperatures over 500°C and processing times of 50 to 200 hours to reach 0 5 to 1 0 mm case depth on steel 3 Low temperature process of present invention does not damage any other elements on the drill bits and other drilling tools The parts which is undesirable to be coated (e g the PDC) can be easily mask off by tape or paint, thus allows easy processing of a tool after their normal manufacturing 4 The coated layer of present invention has higher wear resistance than the nitπding layer used in US patent The wear resistance of bit surface is important for successful drilling Once the negative layer wearied out, the drill bit loses the resistance to mud balling
5 The coated layer of present invention can be easily built up to 10 mm thick, if desired, with perfect surface finishing 6 Present invention allows incorporation of abrasive particles in the coated layer This further improves the wear resistance of the negative layer on bit surface, and thus increases the working life of 'anti-balling' bit
7. The potential difference between the coated layers, steel and matrix bit bodies can be measured. Nickel-based alloy coating and tungsten carbide matrix bit shows 0.35 V in potential difference, with coating more negative, when they were dipping into a water- wetted sticky clay from North Sea. The steel bit shows 0.52 V more positive than the nickel coating.
Example
The invention is illustrated in the drawing in which
Fig. 1 is showing a part of a drilling head with drilling bits in perspective view, while
Fig. 2 is showing schematically the surface of a drilling bit, to illustrate the mechanism of the invention.
In Fig. 1 , a drilling head 1 1 of known design with a sperical end 12 is provided with eigth radially protruding and helically extending ribs 13 distributed around the end 12. Each rib 13 is carrying a row of drilling bits 14. The drilling bits 14 may be of steel or matrix (e.g. tungsten carbide), with a coating of polycrystalinic diamond (PCD) (not shown). The interspaces 15 between the ribs 13 makes flow areas for drilling mud supplied to the drilling head 1 1. Drilling tools of this kind are described in several sources.
In Fig. 2 a section of a drilling bit 14 is shown with an enlarged layer or coating 16 of a nickel alloy. Nickel-based alloys can be deposited by electroplating in a rapid and easy process and provide excellent results. The negatively charged coating 16 will expell negatively charged clay 17 or similar material.
As an alternative, chromnium alloy may be used for the coating 19. Chromnium alloy has a more negative tension and a higher abrasive resistance, but is mor difficult to coat.
Abrasive particles, such as silicium carbide, tungsten carbide and diamond powder, may be included in the coating during electroplating.
Claims
Claims:
1 A matrix or steel based drilling tool, particularly a drilling head for drilling in constituents disposed to stick to the tool, with a surface which for at least a substantial part being transformed to increase the negative electrochemical potential of the surface compared to the adjoining parts of the drilling tool, the drilling tool being prared of a WC-matπx, characterized by a coating (16) on at least the parts of the drilling tool comprising a material being at a more negative electrochemical potential than steel and/or than the alloys used in matrix bits ( 14)
2 Drilling tool according to claim 1 , characterized in that said parts of the surface of the drilling tool is provided with a coating of nickel and/or chromnium alloy
3 Drilling tool according to claim 1 or 2, characterized in that the thickness of the coating is in the magnitude of 0,1 to 3 mm
4 Drilling tool according to one of the claims 1-3, characterized in that the coating is provided by electroplating
5 Drilling tool according to one of the claims 1 -4, characterized in that grinding material preferably diamond powder or tungsten carbide, is included in the coating
6 Drilling tool according to one of the claims 1-5, characterized in that the coating of the drilling tool is made selectively over parts of the tool, preferably covering the drilling bits
7 Use of a material with a higher electrochemical tension than steel, e g a nickel and/or chromnium alloy, as a coating material, for at least a part of the drilling head of a drilling tool for drilling in substances being disposed for sticking to the drilling tool, particularly clay substances
8 Method for preparing drilling tools for use in clay substances, to avoid bit balling, characterized in that at least a part of the drilling head of the drilling tool is electroplated with at metal or alloy having a higher negative electrochemical potential than the supporting steel or metal matrix
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20014799A NO20014799D0 (en) | 2001-10-03 | 2001-10-03 | Drill bit |
| NO20014799 | 2001-10-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003029604A1 true WO2003029604A1 (en) | 2003-04-10 |
Family
ID=19912888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO2002/000358 WO2003029604A1 (en) | 2001-10-03 | 2002-10-03 | Prevention of bit balling by metallic coasting |
Country Status (2)
| Country | Link |
|---|---|
| NO (1) | NO20014799D0 (en) |
| WO (1) | WO2003029604A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004205100B2 (en) * | 2003-08-13 | 2007-07-05 | Sandvik Intellectual Property Ab | Apparatus and method for selective laser-applied cladding |
| US20120205162A1 (en) * | 2010-01-18 | 2012-08-16 | Baker Hughes Incorporated | Downhole tools having features for reducing balling, methods of forming such tools, and methods of repairing such tools |
| WO2014100608A1 (en) * | 2012-12-21 | 2014-06-26 | Exxonmobil Research And Engineering Company | Methods of making a drilling tool with low friction coatings to reduce balling and friction |
| CN110469270A (en) * | 2018-05-11 | 2019-11-19 | 成都百施特金刚石钻头有限公司 | A kind of PDC drill bit with anti-mud drum function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2372575A (en) * | 1938-10-10 | 1945-03-27 | John T Hayward | Method of freeing pipe jammed in a well |
| US3818996A (en) * | 1972-10-10 | 1974-06-25 | Sun Oil Co | Repulsing clays on drill bits |
| GB2038214A (en) * | 1978-12-21 | 1980-07-23 | Dianite Coatings Ltd | Abrasive tool |
| US5330016A (en) * | 1993-05-07 | 1994-07-19 | Barold Technology, Inc. | Drill bit and other downhole tools having electro-negative surfaces and sacrificial anodes to reduce mud balling |
| US5332050A (en) * | 1991-09-16 | 1994-07-26 | Tri City Services, Inc. | Well drilling tool |
-
2001
- 2001-10-03 NO NO20014799A patent/NO20014799D0/en unknown
-
2002
- 2002-10-03 WO PCT/NO2002/000358 patent/WO2003029604A1/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2372575A (en) * | 1938-10-10 | 1945-03-27 | John T Hayward | Method of freeing pipe jammed in a well |
| US3818996A (en) * | 1972-10-10 | 1974-06-25 | Sun Oil Co | Repulsing clays on drill bits |
| GB2038214A (en) * | 1978-12-21 | 1980-07-23 | Dianite Coatings Ltd | Abrasive tool |
| US5332050A (en) * | 1991-09-16 | 1994-07-26 | Tri City Services, Inc. | Well drilling tool |
| US5330016A (en) * | 1993-05-07 | 1994-07-19 | Barold Technology, Inc. | Drill bit and other downhole tools having electro-negative surfaces and sacrificial anodes to reduce mud balling |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004205100B2 (en) * | 2003-08-13 | 2007-07-05 | Sandvik Intellectual Property Ab | Apparatus and method for selective laser-applied cladding |
| US20120205162A1 (en) * | 2010-01-18 | 2012-08-16 | Baker Hughes Incorporated | Downhole tools having features for reducing balling, methods of forming such tools, and methods of repairing such tools |
| EP2354436A3 (en) * | 2010-01-18 | 2014-07-16 | Baker Hughes Incorporated | Downhole tools having features for reducing balling, methods of forming such tools, and methods of repairing such tools |
| US8985244B2 (en) | 2010-01-18 | 2015-03-24 | Baker Hughes Incorporated | Downhole tools having features for reducing balling and methods of forming such tools |
| US9157283B2 (en) * | 2010-01-18 | 2015-10-13 | Baker Hughes Incorporated | Downhole tools having features for reducing balling, and methods of forming such tools |
| US9551191B2 (en) | 2010-01-18 | 2017-01-24 | Baker Hughes Incorporated | Methods of forming downhole tools having features for reducing balling |
| US9593539B2 (en) | 2010-01-18 | 2017-03-14 | Baker Hughes Incorporated | Methods of forming downhole tools having features for reducing balling |
| US10024111B2 (en) | 2010-01-18 | 2018-07-17 | Baker Hughes Incorporated | Methods of forming downhole tools having features for reducing balling |
| WO2014100608A1 (en) * | 2012-12-21 | 2014-06-26 | Exxonmobil Research And Engineering Company | Methods of making a drilling tool with low friction coatings to reduce balling and friction |
| CN110469270A (en) * | 2018-05-11 | 2019-11-19 | 成都百施特金刚石钻头有限公司 | A kind of PDC drill bit with anti-mud drum function |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20014799D0 (en) | 2001-10-03 |
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