CA2074132A1 - Method of producing a corrosion-protective layer on pipe threads - Google Patents
Method of producing a corrosion-protective layer on pipe threadsInfo
- Publication number
- CA2074132A1 CA2074132A1 CA002074132A CA2074132A CA2074132A1 CA 2074132 A1 CA2074132 A1 CA 2074132A1 CA 002074132 A CA002074132 A CA 002074132A CA 2074132 A CA2074132 A CA 2074132A CA 2074132 A1 CA2074132 A1 CA 2074132A1
- Authority
- CA
- Canada
- Prior art keywords
- oil
- threaded portions
- pipes
- corrosion
- pipe end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011241 protective layer Substances 0.000 title claims abstract description 6
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 230000000007 visual effect Effects 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 abstract description 4
- 239000004519 grease Substances 0.000 description 5
- 241000150100 Margo Species 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012459 cleaning agent Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/006—Accessories for drilling pipes, e.g. cleaners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/008—Corrosion preventing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/182—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for screw-threaded joints
Abstract
ABSTRACT OF THE DISCLOSURE
A method of producing a protective layer which is effective against corrosion on threads of screw connections of pipes which are used for conveying oil or gas. Before a thread protection device is screwed onto the threaded portions of the pipes, a corrosion-resistant lubricant is applied on the previously cleaned threaded portions. The lubricant used is a highly viscous but transparent oil, so that a visual check of the threaded portions is possible when the pipes are to be screwed together. The oil is selected to be of a type which is mixable with screw greases which are used when the pipes are screwed together.
A method of producing a protective layer which is effective against corrosion on threads of screw connections of pipes which are used for conveying oil or gas. Before a thread protection device is screwed onto the threaded portions of the pipes, a corrosion-resistant lubricant is applied on the previously cleaned threaded portions. The lubricant used is a highly viscous but transparent oil, so that a visual check of the threaded portions is possible when the pipes are to be screwed together. The oil is selected to be of a type which is mixable with screw greases which are used when the pipes are screwed together.
Description
2~7 BACKGROUND OF THE INVENTION
1. Field of the ~nven~iQn The present invention relates to a method of producing a protective layer which is effective against corrosion on threads of screw connections of pipes used for conveying oil or gas. The method includes applying by the manufacturer of the pipe a corrosion-resistant lubricant on the previously cleaned threaded pottions of the pipe connection before a thread protection device is screwed onto the connection.
G:\MARGo\324s1~2.APP --2--2. Descn~tion of the Related Art For transporting and storing pipes used in oil fields, it is necessary to protect the sensitive threa~ed portions of sleeve and pipe journal against impacts and the resulting corrosion attack. For this purpose, a corrosion-resistant lubricant, for example, API grease or a comparable highly viscous paste-like medium is applied onto the previously cleaned threaded portions and a protection device is subsequently screwed onto the pipe end. In this regard, it is of no significance whether it is a sleeve connection or an integral connection.
Before the pipe is used in the field, the pipe end protection device, which usually is of plastics material or steel-reinforced plastics material, is again screwed off. In order to make it possible before screwing the pipes together to perform a visual check for mechanical damage and corrosion of the individual p;pes lo be screwed together, it is necessary in a complicated manner to remove the corrosion-resistant medium which was applied by the manufacturer. Solvent-containing cleaning agents and appropriate brush systems are used for removing the corrosion-resistant medium. For reasons of environmental protection, it is not possible simply to discharge the removed medium as well as the cleaning agent used for removing the medium. Rather, it is necessary to dispose of them in a difflcult and expensive manner.
G~ ARGo\3245162.App --3--2~? ~ .3~
MARY OF T~IE IN~NTIQN
Therefore, it is the object of the present invention to provide a method of producing a protective layer effective against corrosion on the threads of screw connections of pipes used in oil fields, wherein before the pipes are screwed together in the field, the removal of the medium of the protective layer and the disposal thereof are no longer necessary.
In accordance with the present invention, a highly viscous but transparent oil is applied onto the threaded portions, wherein the oil permits a visual check of the threaded portions and wherein the oil is of a type which can be mixed with the screw greases which are used during screwing together of the pipes on the derrick.
The method according to the present invention provides the advantage that without losing the production of a temporary corrosion protection, the expensive cleaning procedure and the subsequent complicated disposal of the agents used in the procedure are unnecessary. The thickness of the applied oil film is so small that, after the pipe end protection device has been screwed off, the transparenc~ of the oil film permits a visual check of the threaded portions without having to remove the oil film by means of a cleaning agent. Moreover, the removal of the oil film is not necessary when the pipes are screwed together later in the field because the oil is mixable with conventionally used screw greases and the efficiency of the screw grease is in no way impaired.
Particularly effective in the method according to the present invention is conventional sliding track oil. Utilizing a sliding track oil having a kinematic viscosity of 460 mm2/s at 40C provides the additional advantage that the screwed-on pipe end protection device of plastics material can adhere better and cannot be separated during transport movements.
G:~M~RGOU245162.MP --4--2~
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.
G:\M~RGo\3z4s162.~Pp --5--2~7 BRIEF DESCRIPI7ON OF THE I)~AWING
In the drawing:
Fig. 1a is an elevational view of 8 pipe end with a journal element;
Fig. Ib is a sectional view of a pipe end protection device for the journal element of Fig. Ia;
Fig. 2a is a partially sectional view of a pipe end with a sleeve screwed onto the pipe end;
Fig. 2b is an elevational view of a pipe end protection device for the sleeve element of Fig. 2a;
Fig. 3 is a partially sectional view of a pipe end with a pipe end protection device screwed onto the pipe end; and Fig. 4 is a partially sectional view of a pipe end with a sleeve screwed onto the pipe end and a pipe end protection device screwed into the sleeve.
G: \MARGO\3245 1 ~S2 . App --6--2~ t '~3 DESCRIPIION OF THE PREFERl~ED EMBODIMENT
Fig. la of the drawing shows a pipe end 1 with a threaded portion constructed as a journal 2 ~hose thread-free end portion, in the illustrated embodiment, has an abutment shoulder 3.
Fig. Ib of the tlrawing is a longitudinal sectional view of a pipe end protection device 4 which fits onto the journal element of the pipe end. This pipe end protection device 4 is usually made of a plastics material which is reinforced by sheet steel.
Fig. 2a of the drawing shows a pipe end 1 similar to Fig. la, however, the difference being that a sleeve 5 is screwed onto the pipe end as a connection element. Sleeve 5 has two internal thread portions 7, 8 which are constructed complementary to the respective journal element 2. In the alternative, it would also be possible to have an integral connection, i.e., the pipe end itself is constructed as a sleeve element.
Fig. 2b of the drawing is a longitudinal sectional view of an end protection device 6 which can be screwed into the sleeve 5.
~ n accordance with the method of the present invention, the unprotected threaded portions 2, 8 are first cleaned, and a highly viscous but transparent oil is then brushed onto the threaded portions 2, 8. Finally, the pipe end protection 4 or 6 is screwed on or into the threaded portion 2, 8.
Figs. 3 and 4 show a state in which the pipe end protection devices 4, 6 secure the unprotected threaded portions 2, 8 during transport. The threaded pipes 1 which have been delivered to the location where they are to be used are either subjected to interrnediate storage or are immediately transported to the construction site. During the intermediate storage, the oil G:~MARGO\3245162.APP --7--2~ 3 applied to the threaded portions 2, 8 acts as a temporary corrosion protestdon.
The method proposed in accordance with the present invention provides the advantage that; after the respective pipe end protecdon device 4, 6 has been screwed off, the threaded portions 2, 8 can be visually checked for damage and corrosion attack without having to remove and dispose of the oil film in a complicated manner.
Before the threaded pipes 1 are screwed together, a standard screw grease is applied onto the threaded portions 2, 8 with the remaining oil film, since the oil has been selected in such a way that it can be mixed with the screw grease and does not impair the effectiveness of the screw grease by being mixed therewith. Screwing together of the threaded pipes I and sinking of the strand of pipes is then carried out in the known manner.
It should be understood that the preferred embodiments and examples described are for illustrative purposes only and are not to be construed as limiting the scope of the present invention which is properly delineated only in the appended claims.
G: \MARGo\3245 1~52 . ~PP --8--
1. Field of the ~nven~iQn The present invention relates to a method of producing a protective layer which is effective against corrosion on threads of screw connections of pipes used for conveying oil or gas. The method includes applying by the manufacturer of the pipe a corrosion-resistant lubricant on the previously cleaned threaded pottions of the pipe connection before a thread protection device is screwed onto the connection.
G:\MARGo\324s1~2.APP --2--2. Descn~tion of the Related Art For transporting and storing pipes used in oil fields, it is necessary to protect the sensitive threa~ed portions of sleeve and pipe journal against impacts and the resulting corrosion attack. For this purpose, a corrosion-resistant lubricant, for example, API grease or a comparable highly viscous paste-like medium is applied onto the previously cleaned threaded portions and a protection device is subsequently screwed onto the pipe end. In this regard, it is of no significance whether it is a sleeve connection or an integral connection.
Before the pipe is used in the field, the pipe end protection device, which usually is of plastics material or steel-reinforced plastics material, is again screwed off. In order to make it possible before screwing the pipes together to perform a visual check for mechanical damage and corrosion of the individual p;pes lo be screwed together, it is necessary in a complicated manner to remove the corrosion-resistant medium which was applied by the manufacturer. Solvent-containing cleaning agents and appropriate brush systems are used for removing the corrosion-resistant medium. For reasons of environmental protection, it is not possible simply to discharge the removed medium as well as the cleaning agent used for removing the medium. Rather, it is necessary to dispose of them in a difflcult and expensive manner.
G~ ARGo\3245162.App --3--2~? ~ .3~
MARY OF T~IE IN~NTIQN
Therefore, it is the object of the present invention to provide a method of producing a protective layer effective against corrosion on the threads of screw connections of pipes used in oil fields, wherein before the pipes are screwed together in the field, the removal of the medium of the protective layer and the disposal thereof are no longer necessary.
In accordance with the present invention, a highly viscous but transparent oil is applied onto the threaded portions, wherein the oil permits a visual check of the threaded portions and wherein the oil is of a type which can be mixed with the screw greases which are used during screwing together of the pipes on the derrick.
The method according to the present invention provides the advantage that without losing the production of a temporary corrosion protection, the expensive cleaning procedure and the subsequent complicated disposal of the agents used in the procedure are unnecessary. The thickness of the applied oil film is so small that, after the pipe end protection device has been screwed off, the transparenc~ of the oil film permits a visual check of the threaded portions without having to remove the oil film by means of a cleaning agent. Moreover, the removal of the oil film is not necessary when the pipes are screwed together later in the field because the oil is mixable with conventionally used screw greases and the efficiency of the screw grease is in no way impaired.
Particularly effective in the method according to the present invention is conventional sliding track oil. Utilizing a sliding track oil having a kinematic viscosity of 460 mm2/s at 40C provides the additional advantage that the screwed-on pipe end protection device of plastics material can adhere better and cannot be separated during transport movements.
G:~M~RGOU245162.MP --4--2~
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.
G:\M~RGo\3z4s162.~Pp --5--2~7 BRIEF DESCRIPI7ON OF THE I)~AWING
In the drawing:
Fig. 1a is an elevational view of 8 pipe end with a journal element;
Fig. Ib is a sectional view of a pipe end protection device for the journal element of Fig. Ia;
Fig. 2a is a partially sectional view of a pipe end with a sleeve screwed onto the pipe end;
Fig. 2b is an elevational view of a pipe end protection device for the sleeve element of Fig. 2a;
Fig. 3 is a partially sectional view of a pipe end with a pipe end protection device screwed onto the pipe end; and Fig. 4 is a partially sectional view of a pipe end with a sleeve screwed onto the pipe end and a pipe end protection device screwed into the sleeve.
G: \MARGO\3245 1 ~S2 . App --6--2~ t '~3 DESCRIPIION OF THE PREFERl~ED EMBODIMENT
Fig. la of the drawing shows a pipe end 1 with a threaded portion constructed as a journal 2 ~hose thread-free end portion, in the illustrated embodiment, has an abutment shoulder 3.
Fig. Ib of the tlrawing is a longitudinal sectional view of a pipe end protection device 4 which fits onto the journal element of the pipe end. This pipe end protection device 4 is usually made of a plastics material which is reinforced by sheet steel.
Fig. 2a of the drawing shows a pipe end 1 similar to Fig. la, however, the difference being that a sleeve 5 is screwed onto the pipe end as a connection element. Sleeve 5 has two internal thread portions 7, 8 which are constructed complementary to the respective journal element 2. In the alternative, it would also be possible to have an integral connection, i.e., the pipe end itself is constructed as a sleeve element.
Fig. 2b of the drawing is a longitudinal sectional view of an end protection device 6 which can be screwed into the sleeve 5.
~ n accordance with the method of the present invention, the unprotected threaded portions 2, 8 are first cleaned, and a highly viscous but transparent oil is then brushed onto the threaded portions 2, 8. Finally, the pipe end protection 4 or 6 is screwed on or into the threaded portion 2, 8.
Figs. 3 and 4 show a state in which the pipe end protection devices 4, 6 secure the unprotected threaded portions 2, 8 during transport. The threaded pipes 1 which have been delivered to the location where they are to be used are either subjected to interrnediate storage or are immediately transported to the construction site. During the intermediate storage, the oil G:~MARGO\3245162.APP --7--2~ 3 applied to the threaded portions 2, 8 acts as a temporary corrosion protestdon.
The method proposed in accordance with the present invention provides the advantage that; after the respective pipe end protecdon device 4, 6 has been screwed off, the threaded portions 2, 8 can be visually checked for damage and corrosion attack without having to remove and dispose of the oil film in a complicated manner.
Before the threaded pipes 1 are screwed together, a standard screw grease is applied onto the threaded portions 2, 8 with the remaining oil film, since the oil has been selected in such a way that it can be mixed with the screw grease and does not impair the effectiveness of the screw grease by being mixed therewith. Screwing together of the threaded pipes I and sinking of the strand of pipes is then carried out in the known manner.
It should be understood that the preferred embodiments and examples described are for illustrative purposes only and are not to be construed as limiting the scope of the present invention which is properly delineated only in the appended claims.
G: \MARGo\3245 1~52 . ~PP --8--
Claims (4)
1. A method of producing a protective layer effective against corrosion on threaded portions of screw connections of pipes which are used for conveying oil or gas, the method comprising cleaning the threaded portions, applying a highly viscous, transparent, corrosion-resistant oil on the threaded portions for facilitating a visual check of the threaded portions, wherein the oil is mixable with screw greases utilized in screwing pipes together, and screwing thread protection devices onto the threaded portions.
2. The method according to claim 1, wherein the oil is a sliding track oil.
3. The method according to claim 2, wherein the sliding track oil has a kinematic viscosity of at least 200 mm2/s at 40°C.
4. The method according to claim 3, wherein the sliding track oil has a kinematic viscosity of 460mm2/s at 40°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4124102A DE4124102C1 (en) | 1991-07-18 | 1991-07-18 | |
| DEP4124102.9 | 1991-07-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2074132A1 true CA2074132A1 (en) | 1993-01-19 |
Family
ID=6436626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002074132A Abandoned CA2074132A1 (en) | 1991-07-18 | 1992-07-17 | Method of producing a corrosion-protective layer on pipe threads |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0523823A1 (en) |
| JP (1) | JPH05202491A (en) |
| CA (1) | CA2074132A1 (en) |
| DE (1) | DE4124102C1 (en) |
| NO (1) | NO922776L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3633135A1 (en) * | 2018-10-02 | 2020-04-08 | Vallourec Oil And Gas France | Protective device for a male end portion of a steel tube intented for use in a tubular hydrocarbon working string |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030219328A1 (en) | 2002-05-23 | 2003-11-27 | Dennis Schultz | Light weight fastener for use on interference fits in automation |
| CN103388460A (en) * | 2012-05-10 | 2013-11-13 | 江阴德玛斯特钻具有限公司 | Tool joint provided with all-steel protecting cap |
| CN107060659A (en) * | 2017-05-08 | 2017-08-18 | 天津中新安德科技有限公司 | A kind of New well drilling swivel joint |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3747700A (en) * | 1971-10-26 | 1973-07-24 | Midway Fishing Tool Co | Oil well mandrel and stabilizing sleeve assembly |
| IE46133B1 (en) * | 1977-01-07 | 1983-03-09 | Quraisha A | Protectors for the ends of tubular elements |
| DE2951354C2 (en) * | 1979-12-20 | 1983-02-24 | Karl Bauer Spezialtiefbau GmbH & Co KG, 8898 Schrobenhausen | Detachable connection for drill pipes |
| JPH0631661B2 (en) * | 1987-02-23 | 1994-04-27 | 新日本製鐵株式会社 | Low stress / highly airtight screw joint for oil country tubular goods |
-
1991
- 1991-07-18 DE DE4124102A patent/DE4124102C1/de not_active Expired - Fee Related
-
1992
- 1992-07-14 NO NO92922776A patent/NO922776L/en unknown
- 1992-07-16 EP EP92250189A patent/EP0523823A1/en not_active Withdrawn
- 1992-07-17 JP JP4213633A patent/JPH05202491A/en active Pending
- 1992-07-17 CA CA002074132A patent/CA2074132A1/en not_active Abandoned
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3633135A1 (en) * | 2018-10-02 | 2020-04-08 | Vallourec Oil And Gas France | Protective device for a male end portion of a steel tube intented for use in a tubular hydrocarbon working string |
| WO2020070165A1 (en) * | 2018-10-02 | 2020-04-09 | Vallourec Oil And Gas France | Protective device for a male end portion of a steel tube intended for use in a tubular hydrocarbon working string |
| CN113272515A (en) * | 2018-10-02 | 2021-08-17 | 瓦卢瑞克石油天然气法国有限公司 | Protection device for male buckle end of steel pipe used in tubular oil-gas operation pipe column |
| RU2769162C1 (en) * | 2018-10-02 | 2022-03-28 | Валлурек Ойл Энд Гес Франс | Protective device for male end part of steel pipe intended for use in working pipe string for hydrocarbons |
| US11293234B2 (en) | 2018-10-02 | 2022-04-05 | Vallourec Oil And Gas France | Protective device for a male end portion of a steel tube intended for use in a tubular hydrocarbon working string |
| CN113272515B (en) * | 2018-10-02 | 2022-05-27 | 瓦卢瑞克石油天然气法国有限公司 | Protection device for male buckle end of steel pipe used in tubular oil-gas operation pipe column |
Also Published As
| Publication number | Publication date |
|---|---|
| NO922776D0 (en) | 1992-07-14 |
| EP0523823A1 (en) | 1993-01-20 |
| NO922776L (en) | 1993-01-19 |
| JPH05202491A (en) | 1993-08-10 |
| DE4124102C1 (en) | 1993-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2003293611B2 (en) | Threaded pipe with surface treatment | |
| CA1287079C (en) | Pipe screwed connection | |
| CA2383894A1 (en) | Threaded joint for oil well pipe | |
| NO20033493D0 (en) | Pipe fitting for stainless steel pipe | |
| RU97118U1 (en) | DRILL PIPE FUSE | |
| US20100089484A1 (en) | Device for protecting a male end of a threaded tubular connection component, having open and closed positions, and associated methods and mounting machines | |
| US2924876A (en) | Thread lubricant package and method | |
| CA2074132A1 (en) | Method of producing a corrosion-protective layer on pipe threads | |
| US20100038904A1 (en) | Protector for tubular threaded joint | |
| US6273657B1 (en) | Anchoring device for securing a threaded member to a substrate | |
| SE9402517L (en) | Threaded joints | |
| JPH11100842A (en) | Rustproof agent holder for anchor bolt and rustproof method using the same | |
| JPS62174493A (en) | Pipe joint | |
| JP6062280B2 (en) | Anti-rust cap for lock bolt and anti-rust method for lock bolt head using anti-rust cap | |
| JPH0110546Y2 (en) | ||
| JPH0881956A (en) | Threaded rustproof permanent anchor | |
| CN211369269U (en) | Rust-proof device for reserved steel bars | |
| CN212107274U (en) | Composite resin fuel rubber pipe | |
| CN212839890U (en) | Composite steel pipe capable of effectively preventing fracture and liquid leakage | |
| GB2179990A (en) | Improvements in cavity walls having corroded wall ties | |
| JPH07310862A (en) | Corrosion-preventive and rust-preventive material for underground buried pipe, and corrosion-preventive and rust-preventive method for underground buried pipe using the material | |
| KR200197796Y1 (en) | Grease-stored cap nut | |
| JP2012102867A (en) | Pipe joint with torque control function | |
| DE59806342D1 (en) | Connection set with non-positive length compensation | |
| JPH067272Y2 (en) | Electrically insulated pipe fittings for gas pipes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |