US1646735A - Electrochemical method for preventing corrosion - Google Patents
Electrochemical method for preventing corrosion Download PDFInfo
- Publication number
- US1646735A US1646735A US727395A US72739524A US1646735A US 1646735 A US1646735 A US 1646735A US 727395 A US727395 A US 727395A US 72739524 A US72739524 A US 72739524A US 1646735 A US1646735 A US 1646735A
- Authority
- US
- United States
- Prior art keywords
- tubing
- zinc
- casing
- collar
- corrosion
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S138/00—Pipes and tubular conduits
- Y10S138/06—Corrosion
Definitions
- the invention relates broadly to an electro-chemical method ot' preventing lcorrosion, and more particularly for preventing corrosion of well casing, tubing, and like apparatus, especially oil well apparatus,
- vzinc extends the full length of the tubing, but it is sufficient to provide such protectinfr material at intervals along the length of the tubing or casing.
- lars are composed partly of metal, such as zinc, which is electro-posithn with respectl to the tubing or casing, the zinc being in close proximity to the inet-al surface to he protected but preferably spaced therefrom :to av id short circuiting.
- Th casing orl tubing collar serves to protect the entii'e ⁇ eqi1ipmeiit to a large extent, and 1s especially effective in preventing corrosion o t the exposed threads ot' the joint.
- the inventor recognizes the well-known art of galvanizing.v metal to prevent corrosion.
- Galvanizing possesses certain disadvantages which are eliminated by the present invention. These disadvantages are :-(1)- The thinness of the protectiiw coat of zinc. The protection lastsl only sld long as the zinc remains intact. Under the action of corrosive brines the zinc'quickly corrodes away and is dissolved and removed from the iron leaving the latter unprotected. (2) T he thin coating of zinc on galvanized iron is easily scratched or otherwise removed, thus exposing the iron. This permits the formation of a galvanic couple between the iron and zinc andstimulates the rapid consumption of the zinc.
- Elie present invention eliminates these disadvantages by providing a zinc ring of sub-- stantial thickness which will withstand coi'- rosive action for a considerable period, and which is spaced away from the tubing or casing to avoid short circuiting. Furthermore, the collar which carries the protective ring may bereadil replaced at asmall cost when the vzinc has 'nally corroded away.
- Fig. 1 is a view partly in longitudinal section and partly in elevation showingthe protective collar applied to a tubing or'casing joint.
- Fig. A 2 is a sectional view of the same taken on line 2*-2 of Fig..1.
- Fig. 3 is a view similar to Fig. 1 showing a modification.
- Two lengths or separate units of well tubing or casing are shown at ⁇ 10--11, each being externally threaded as at 12 and adapted to be screwed i' ternally threaded at responding threaded 1li-to receive the corportions 12 of the tubing or casin
- the zinc which is electro-positive with respect to the iron, surrounds the unengagcd threads l5 and by its electro-positive property with' respect to iron and its close proiilnity to the tubing or casing and the exposed threads thereof, protects theni against corrosion.
- Fig. 3 a modified collar which may be applied to either tubing or casings.
- the Zincextends for some distance beyond the steel shell as at 18 and serves to protect the body of the tubing as well as the threads of the joint. If preferred, the zinc may 'terminate at, 19
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Description
ct. 25 i927.
R. VAN A; MILLS ELECTRGCHEMICAL METHOD FOR PREVENTING CORROSIN Original Filed July 21, 1924 4 v o 3/5 0//0/24/2 f /2 if/4H W# Patented Get. 25, 1927.
rf/ff ,RONALD VAN AUKEN MILLS,
NYCE, OF WASHINGTON,
oFsANDY SPRING, MARYLAND, AssiGNon 'ro- PETER Q.
DISTRICT 0F COLUMBIA.
ELECTROCHEMICAL METHOD FOR. PREVENTING CORROSION.
Application led July 21, 1924, Serial No.
The invention relates broadly to an electro-chemical method ot' preventing lcorrosion, and more particularly for preventing corrosion of well casing, tubing, and like apparatus, especially oil well apparatus,
which is very subject to coriosion due to thepresence of saline or otherfcorrosive liquids which come in contact with the tubing, casing or other apparatus, and set up electrolytic or galvanic action, which is especially marked at the tubing or casing joints.
It'is well known that corrosion is essentially ,an electrochemical .process dependent upon galvanic action, and that corrosion occurs on electro-positive surfaces,jthat is to say, the surfaces from which an electric current leaves a metal and passes into an electrolyte like salt water.
By providing an electio-pos'tive material that will corrode in preference to the iron or other 'metal in the equipment, corrosion of the equipment itself is prevented.
According to the present invention Iprovide zinc or other metal which is electropositive to iron in close proximity. to the tubing, casing or other equipment whereby the apparatus to be protected isl rendered electro-negative, and corrosion takes place from surface of the zinc or other protecting substance.
It is not necessary that the vzinc extend the full length of the tubing, but it is sufficient to provide such protectinfr material at intervals along the length of the tubing or casing.
It is further trical contact between and the zinc or other protecting material except for a limited distance. The disadvantages of the direct Contact are two-told. First, protection is localized, only the surface immediately in the vicinity of the zinc being protected, whereas whenl the zinc is spaced apart from the equipment it has been found that a much larger portion of the tubing is electrically affected, and corrosion consequently prevented. Secondly, short circuiting or contact' action takes place between the iron and zinc where the-two are desirable to avoid direct elecplaced indirect contact, which gives rise tov rapid consumption of the zinc.
According tothe present invention, I have accordingly provided special casing or tubing collars, located at the joints of successive lengths of the casing or tubing. These colthe tubing or casing 727,395. Renewed September 3, 1926.
lars are composed partly of metal, such as zinc, which is electro-posithn with respectl to the tubing or casing, the zinc being in close proximity to the inet-al surface to he protected but preferably spaced therefrom :to av id short circuiting. i
Th casing orl tubing collar serves to protect the entii'e`eqi1ipmeiit to a large extent, and 1s especially effective in preventing corrosion o t the exposed threads ot' the joint.
The inventor recognizes the well-known art of galvanizing.v metal to prevent corrosion. Galvanizing, however, possesses certain disadvantages which are eliminated by the present invention. These disadvantages are :-(1)- The thinness of the protectiiw coat of zinc. The protection lastsl only sld long as the zinc remains intact. Under the action of corrosive brines the zinc'quickly corrodes away and is dissolved and removed from the iron leaving the latter unprotected. (2) T he thin coating of zinc on galvanized iron is easily scratched or otherwise removed, thus exposing the iron. This permits the formation of a galvanic couple between the iron and zinc andstimulates the rapid consumption of the zinc.
Elie present invention eliminates these disadvantages by providing a zinc ring of sub-- stantial thickness which will withstand coi'- rosive action for a considerable period, and which is spaced away from the tubing or casing to avoid short circuiting. Furthermore, the collar which carries the protective ring may bereadil replaced at asmall cost when the vzinc has 'nally corroded away.
The invention will be more clearly understood by reference to thel accompanying drawings Fig. 1 is a view partly in longitudinal section and partly in elevation showingthe protective collar applied to a tubing or'casing joint.
Fig. A 2 is a sectional view of the same taken on line 2*-2 of Fig..1.
Fig. 3 is a view similar to Fig. 1 showing a modification. j Two lengths or separate units of well tubing or casing are shown at `10--11, each being externally threaded as at 12 and adapted to be screwed i' ternally threaded at responding threaded 1li-to receive the corportions 12 of the tubing or casin At'each jolnt there are a number of threads into a collar 13 which is inengaged in the collar and are consequently exposed to corrosive action Where the ordinary forni of collar is employed. According to the present invention corrosion of the' tub- `ing or casing andparticularly df the .exposed threads is prevented by providing zinc cast` ings 1G inside the collar and extending beyond the threaded portion of the collar. The ends 17 oi. the' outer steel or iron shell of the collar muy be beveled andturned into securely hold the zinc in place.
The zinc which is electro-positive with respect to the iron, surrounds the unengagcd threads l5 and by its electro-positive property with' respect to iron and its close proiilnity to the tubing or casing and the exposed threads thereof, protects theni against corrosion.
In Fig. 3 is shown a modified collar which may be applied to either tubing or casings. In this modification, the Zincextends for some distance beyond the steel shell as at 18 and serves to protect the body of the tubing as well as the threads of the joint. If preferred, the zinc may 'terminate at, 19
vNo. 750,807.
Having t-hus described my invention, what I claim as new and desire to secure by Letters Patent is v l. The nietho-d of protecting Well tubing against corrosion,
which consists in providing a. collar upon said tubing, said collar having a zinc ring in close proximity to the tubing but spaced therefrom.
2. The method of protecting tubing against corrosion which consists in applying collars at the joints bet-Ween of tubing, each collar being provided With an internal ring of metal which is electropositive with respect to the tubing.
In testimony whereof I allix iny'signature.
RONALD VAN AUKEN MILLS.
two, as in Fig. 1. Ob-
adjacent lengths
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US727395A US1646735A (en) | 1924-07-21 | 1924-07-21 | Electrochemical method for preventing corrosion |
US750807A US1646736A (en) | 1924-07-21 | 1924-11-19 | Electrochemical means for preventing corrosion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US727395A US1646735A (en) | 1924-07-21 | 1924-07-21 | Electrochemical method for preventing corrosion |
Publications (1)
Publication Number | Publication Date |
---|---|
US1646735A true US1646735A (en) | 1927-10-25 |
Family
ID=24922471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US727395A Expired - Lifetime US1646735A (en) | 1924-07-21 | 1924-07-21 | Electrochemical method for preventing corrosion |
Country Status (1)
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US (1) | US1646735A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3029195A (en) * | 1959-05-29 | 1962-04-10 | Pure Oil Co | Method of cathodically protecting well casing |
US3251427A (en) * | 1963-10-02 | 1966-05-17 | Exxon Production Research Co | Protection of drill pipe |
US3277966A (en) * | 1963-11-01 | 1966-10-11 | Warren F Ward | Guide with sacrificial inserts |
US4156529A (en) * | 1977-02-16 | 1979-05-29 | Hafele Carl H | Stuffing box seal for fittings |
FR2511748A1 (en) * | 1981-08-20 | 1983-02-25 | Sumitomo Metal Ind | OIL WELL PRODUCTION PIPE AND COLUMN JOINT, AND METHOD FOR MANUFACTURING THE SAME |
US4688828A (en) * | 1986-04-02 | 1987-08-25 | Shaffer Donald U | Tubing joint for corrosion protection |
EP0955447A2 (en) * | 1998-05-04 | 1999-11-10 | Halliburton Energy Services, Inc. | Sand control screen with cathodic protection |
US20070181296A1 (en) * | 2006-02-08 | 2007-08-09 | David Hall | Self-expandable Cylinder in a Downhole Tool |
CN105276336A (en) * | 2014-12-08 | 2016-01-27 | 中国石油天然气股份有限公司 | Method for preventing corrosion in welded pipe and pipe used for method |
US20170321839A1 (en) * | 2016-05-05 | 2017-11-09 | GM Global Technology Operations LLC | Fluid connector with sacrificial anode |
-
1924
- 1924-07-21 US US727395A patent/US1646735A/en not_active Expired - Lifetime
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3029195A (en) * | 1959-05-29 | 1962-04-10 | Pure Oil Co | Method of cathodically protecting well casing |
US3251427A (en) * | 1963-10-02 | 1966-05-17 | Exxon Production Research Co | Protection of drill pipe |
US3277966A (en) * | 1963-11-01 | 1966-10-11 | Warren F Ward | Guide with sacrificial inserts |
US4156529A (en) * | 1977-02-16 | 1979-05-29 | Hafele Carl H | Stuffing box seal for fittings |
FR2511748A1 (en) * | 1981-08-20 | 1983-02-25 | Sumitomo Metal Ind | OIL WELL PRODUCTION PIPE AND COLUMN JOINT, AND METHOD FOR MANUFACTURING THE SAME |
US4688828A (en) * | 1986-04-02 | 1987-08-25 | Shaffer Donald U | Tubing joint for corrosion protection |
EP0955447A2 (en) * | 1998-05-04 | 1999-11-10 | Halliburton Energy Services, Inc. | Sand control screen with cathodic protection |
EP0955447A3 (en) * | 1998-05-04 | 2000-09-13 | Halliburton Energy Services, Inc. | Sand control screen with cathodic protection |
US20070181296A1 (en) * | 2006-02-08 | 2007-08-09 | David Hall | Self-expandable Cylinder in a Downhole Tool |
US7350565B2 (en) * | 2006-02-08 | 2008-04-01 | Hall David R | Self-expandable cylinder in a downhole tool |
CN105276336A (en) * | 2014-12-08 | 2016-01-27 | 中国石油天然气股份有限公司 | Method for preventing corrosion in welded pipe and pipe used for method |
US20170321839A1 (en) * | 2016-05-05 | 2017-11-09 | GM Global Technology Operations LLC | Fluid connector with sacrificial anode |
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