US2795278A - Method for protecting oil well casings - Google Patents
Method for protecting oil well casings Download PDFInfo
- Publication number
- US2795278A US2795278A US373041A US37304153A US2795278A US 2795278 A US2795278 A US 2795278A US 373041 A US373041 A US 373041A US 37304153 A US37304153 A US 37304153A US 2795278 A US2795278 A US 2795278A
- Authority
- US
- United States
- Prior art keywords
- casing
- gel
- annular space
- well
- range
- 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
Links
- 238000000034 method Methods 0.000 title claims description 12
- 239000003129 oil well Substances 0.000 title description 2
- 239000000243 solution Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims description 7
- YLGXILFCIXHCMC-JHGZEJCSSA-N methyl cellulose Chemical compound COC1C(OC)C(OC)C(COC)O[C@H]1O[C@H]1C(OC)C(OC)C(OC)OC1COC YLGXILFCIXHCMC-JHGZEJCSSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims 1
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 claims 1
- 239000000499 gel Substances 0.000 description 16
- 229920003086 cellulose ether Polymers 0.000 description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- 150000002170 ethers Chemical class 0.000 description 4
- 239000001856 Ethyl cellulose Substances 0.000 description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 229920001249 ethyl cellulose Polymers 0.000 description 2
- 235000019325 ethyl cellulose Nutrition 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000005086 pumping Methods 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
- 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
-
- 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
-
- 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
- Y10S166/00—Wells
- Y10S166/902—Wells for inhibiting corrosion or coating
-
- 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
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/939—Corrosion inhibitor
Definitions
- the annulus between the exterior of the casing and the Wall of the borehole may contain solutions which are highly corrosive to the steel casing.
- This fluid may be corrosive because it is a native formation water of high corrosivity or because it is in contact with corrosive salt beds or because the drilling fluid used in drilling the well conducts stray currents.
- the fluid in the annulus may be highly corrosive to the external surface of the steel casing, thereby causing early failure of the member and necessitating casing repair.
- the present invention is directed to a method for suppressing or preventing such corrosion of the casing.
- well casing is protected from corrosion by displacing fluid originally in the annular space between the casing and the wall of the borehole with a noncorrosive aqueous solution of water soluble alkylated cellulose ether.
- the solution used is sufficiently mobile to be pumped into position in the annulus and is capable of forming a gel within said annulus upon being retained quiescent therein. After the solution has been placed, it is maintained quiescent in said annulus until it forms a noncorrosive gel around the casing in the space between the casing and the wall of the borehole.
- the gel forms an impervious coating on the well casing, whereby contact with corrosive salt beds, corrosive native formation water and media of high conductivity is eliminated.
- the electrical conductivity of the coating is substantially negligible so that stray currents conducted down the casing from surface equipment are prevented from leaving the casing to conductive formations. This eliminates concentrated corrosion of the easing which results upon passage of current from the casing to highly conductive formations.
- a non-conductive aqueous solution of water soluble alkylated cellulose ether is formed.
- the solution is sufliciently mobile to be pumped into place and once placed will form a gel under the temperature conditions present in the well. It is preferred that the solution used have an absolute viscosity within the range of 100 to 4000 centipoises.
- the viscosity of the aqueous solutions of such ethers is in general a function of the molecular weight of the ethers, of the concentration of the solution and of the temperature of the solution.
- the viscosity of the solution may vary over 0 2,795,278 Patented June 11, 1957 a wide range and satisfactory results will be obtained.
- the use of the solution it is essential that it be non-conductive, that it be sufficiently mobile to permit placement, as by pumping downwardly into the well and then upwardly from the bottom of the easing into the annular space between the casing and the wall of the borehole, and that it be capable of forming a gel within the well upon being retained quiescent in said annular space in the well.
- water solutions of alkylated cellulose ethers in the concentration range of .5 to 4%, said solution being capable of forming a :gel when retained in a quiescent state at a temperature range of 126 to 150 F. It is preferred to use such alkylated cellulose ethers whose 5% aqueous solutions have a viscosity range of to 4000 centipoises at 68 F.
- a 2% by weight water solution of what is known as a medium viscosity type of methyl cellulose ether has a viscosity of 400 centipoises at 68 F. This solution is perfectly fluid at lower temperatures but gels at a temperature of approximately 122 F. to a very viscous or plastic mass.
- a method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble alkylated cellulose ether sufliciently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises at 68 F. and capable of forming a gel within the well upon being retained quiescent therein and maintaining said aqueous solution quiescent in said annular space between the casing and the wall of the borehole at a temperature in the range of 126 to F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
- a method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble methyl cellulose ether sufficiently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises for a 2% solution at 68 F. and capable of forming a gel upon being retained quiescent within the well and maintaining said aqueous solution quiescent in the annular space between the casing and the wall of the borehole at a temperature in the range of 126 to 150 F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
- a method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble ethyl cellulose ether sufliciently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises for at 2% solution at 68 F. and capable of forming a gel within the well upon being retained quiescent therein and maintaining said aqueous solution quiescent in said annular space between the casing and the wall of the borehole at a temperature in the range of 126 to 150 F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
aired. drama METHOD FOR PROTECTING OIL WELL CASINGS No Drawing. Appiication August 7, 1953, Serial No. 373,041
5 Claims. (Cl. 166-1) This application is directed to a method for protecting casing in a well against corrosion.
In cased wells such as those for producing oil, gas or water, the annulus between the exterior of the casing and the Wall of the borehole may contain solutions which are highly corrosive to the steel casing. This fluid may be corrosive because it is a native formation water of high corrosivity or because it is in contact with corrosive salt beds or because the drilling fluid used in drilling the well conducts stray currents. In any event, the fluid in the annulus may be highly corrosive to the external surface of the steel casing, thereby causing early failure of the member and necessitating casing repair.
The present invention is directed to a method for suppressing or preventing such corrosion of the casing.
In accordance with the present invention, well casing is protected from corrosion by displacing fluid originally in the annular space between the casing and the wall of the borehole with a noncorrosive aqueous solution of water soluble alkylated cellulose ether. The solution used is sufficiently mobile to be pumped into position in the annulus and is capable of forming a gel within said annulus upon being retained quiescent therein. After the solution has been placed, it is maintained quiescent in said annulus until it forms a noncorrosive gel around the casing in the space between the casing and the wall of the borehole. The gel forms an impervious coating on the well casing, whereby contact with corrosive salt beds, corrosive native formation water and media of high conductivity is eliminated. The electrical conductivity of the coating is substantially negligible so that stray currents conducted down the casing from surface equipment are prevented from leaving the casing to conductive formations. This eliminates concentrated corrosion of the easing which results upon passage of current from the casing to highly conductive formations.
In carrying out the method of the present invention, a non-conductive aqueous solution of water soluble alkylated cellulose ether is formed. The solution is sufliciently mobile to be pumped into place and once placed will form a gel under the temperature conditions present in the well. It is preferred that the solution used have an absolute viscosity within the range of 100 to 4000 centipoises.
The preparation and use of aqueous solutions of water soluble alkylated cellulose ether is known. The most common water soluble alkylated cellulose ethers are termed methyl cellulose ether and ethyl cellulose ether, although each of these materials as used in commerce, is considered to be a mixture of ethers rather than a single ether. In addition, other alkylated ethers or mixtures thereof may be employed, such as propyl cellulose ethers and butyl cellulose ethers.
The viscosity of the aqueous solutions of such ethers is in general a function of the molecular weight of the ethers, of the concentration of the solution and of the temperature of the solution. In the practice of the present invention the viscosity of the solution may vary over 0 2,795,278 Patented June 11, 1957 a wide range and satisfactory results will be obtained. In
' the use of the solution it is essential that it be non-conductive, that it be sufficiently mobile to permit placement, as by pumping downwardly into the well and then upwardly from the bottom of the easing into the annular space between the casing and the wall of the borehole, and that it be capable of forming a gel within the well upon being retained quiescent in said annular space in the well.
Generally, it will be found preferable to use water solutions of alkylated cellulose ethers in the concentration range of .5 to 4%, said solution being capable of forming a :gel when retained in a quiescent state at a temperature range of 126 to 150 F. It is preferred to use such alkylated cellulose ethers whose 5% aqueous solutions have a viscosity range of to 4000 centipoises at 68 F. By way of specific example, a 2% by weight water solution of what is known as a medium viscosity type of methyl cellulose ether has a viscosity of 400 centipoises at 68 F. This solution is perfectly fluid at lower temperatures but gels at a temperature of approximately 122 F. to a very viscous or plastic mass.
Having fully described the method of the present invention, what is desired to be claimed is:
1. A method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble alkylated cellulose ether sufliciently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises at 68 F. and capable of forming a gel within the well upon being retained quiescent therein and maintaining said aqueous solution quiescent in said annular space between the casing and the wall of the borehole at a temperature in the range of 126 to F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
2. A method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble methyl cellulose ether sufficiently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises for a 2% solution at 68 F. and capable of forming a gel upon being retained quiescent within the well and maintaining said aqueous solution quiescent in the annular space between the casing and the wall of the borehole at a temperature in the range of 126 to 150 F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
3. A method in accordance with claim 2 in which said solution has a concentration within the range of .5 to 4%.
4. A method for protecting a casing in a well from corrosion including the steps of displacing corrosive fluid in the annular space between the casing and the wall of the borehole with a non-conductive aqueous solution consisting of water and water soluble ethyl cellulose ether sufliciently mobile to be pumped into place having an absolute viscosity within the range of 100 to 4000 centipoises for at 2% solution at 68 F. and capable of forming a gel within the well upon being retained quiescent therein and maintaining said aqueous solution quiescent in said annular space between the casing and the wall of the borehole at a temperature in the range of 126 to 150 F. to form a non-conductive gel, and then producing a fluid through said casing while maintaining said gel in said annular space.
5. A method in accordance with claim 4 in which said solution has a concentration within the range of .5 to 4%.
References Cited in the file of this patent UNITED STATES PATENTS 2,543,868 Prokap Mar. 6, 1951 2,582,909 Laurence Jan. 15, 1952 2,593,057 Savoy Apr. 15, 1952 2,742,090 Garrison Apr. 17, 1956 FOREIGN PATENTS Canada Nov. 29, 1949 OTHER REFERENCES Mills, R. Van A.: Protection of Oil and Gas Field Equipment Against Corrosion, Bulletin 233, Dept. of the Interior, Bureau of Mines, 1925, pp. 73-79.
Claims (1)
- 2. A METHOD FOR PROTECTING A CASING IN A WELL FROM CORROSION INCLUDING THE STEPS OF DISPLACING CORROSIVE FLUID IN THE ANNULAR SPACE BETWEEN THE CASING AND THE WALL OF THE BOREHOLE WITH A NON-CONDUCTIVE AQUEOUS SOLUTION CONSISTING OF WATER AND WATER SOLUBLE METHYL CELLULOSE ETHER SUFFICIENTLY MOBILE TO BE PUMPED INTO PLACE HAVING AN ABSOLUTE VISCOSITY WITHIN THE RANGE OF 100 TO 4000 CENTIPOISES FOR A 2% SOLUTION AT 68%F. AND CAPABLE OF FORMING A GEL UPON BEING RETAINED QUIESCENT WITHIN THE WELL AND MAINTAINING SAID AQUEOUS SOLUTION QUIESCENT IN THE ANNULAR SPACE BETWEEN THE CASINGAND THE WALL OF THE BOREHOLE AT A TEMPERATURE IN THE RANGE OF 126* TO 150*F. TO FORM A NON-CONDUCTIVE GEL, AND THEN PRODUCING A FLUID THROUGH SAID CASTING WHILE MAINTAINING SAID GEL IN SAID ANNULAR SPACE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US373041A US2795278A (en) | 1953-08-07 | 1953-08-07 | Method for protecting oil well casings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US373041A US2795278A (en) | 1953-08-07 | 1953-08-07 | Method for protecting oil well casings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2795278A true US2795278A (en) | 1957-06-11 |
Family
ID=23470666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US373041A Expired - Lifetime US2795278A (en) | 1953-08-07 | 1953-08-07 | Method for protecting oil well casings |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2795278A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3025965A (en) * | 1957-10-10 | 1962-03-20 | Phillips Petroleum Co | Hydraulic cyclone unit |
| US3298438A (en) * | 1961-02-20 | 1967-01-17 | Atlantic Refining Co | Method for preventing corrosion |
| US4266607A (en) * | 1980-04-07 | 1981-05-12 | Mobil Oil Corporation | Method for protecting a carbon dioxide production well from corrosion |
| US5135053A (en) * | 1991-05-09 | 1992-08-04 | Atlantic Richfield Company | Treatment of well tubulars with gelatin |
| US5186972A (en) * | 1991-06-06 | 1993-02-16 | Becton, Dickinson And Company | Method for lubricating articles |
| US5254366A (en) * | 1992-04-06 | 1993-10-19 | Atlantic Richfield Company | Method of treating tubulars with ungelled gelatin |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA461475A (en) * | 1949-11-29 | R. Wagner Cary | Drilling fluid and method of use | |
| US2543868A (en) * | 1948-01-30 | 1951-03-06 | Standard Oil Dev Co | Sealing of porous formations |
| US2582909A (en) * | 1947-09-06 | 1952-01-15 | Standard Oil Dev Co | Preparation and use of fluid plugs in oil well cementing |
| US2593057A (en) * | 1949-12-29 | 1952-04-15 | Pure Oil Co | Inhibitors against hydrogen sulfide and brine corrosion |
| US2742090A (en) * | 1952-07-25 | 1956-04-17 | Texaco Development Corp | Setting well casings |
-
1953
- 1953-08-07 US US373041A patent/US2795278A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA461475A (en) * | 1949-11-29 | R. Wagner Cary | Drilling fluid and method of use | |
| US2582909A (en) * | 1947-09-06 | 1952-01-15 | Standard Oil Dev Co | Preparation and use of fluid plugs in oil well cementing |
| US2543868A (en) * | 1948-01-30 | 1951-03-06 | Standard Oil Dev Co | Sealing of porous formations |
| US2593057A (en) * | 1949-12-29 | 1952-04-15 | Pure Oil Co | Inhibitors against hydrogen sulfide and brine corrosion |
| US2742090A (en) * | 1952-07-25 | 1956-04-17 | Texaco Development Corp | Setting well casings |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3025965A (en) * | 1957-10-10 | 1962-03-20 | Phillips Petroleum Co | Hydraulic cyclone unit |
| US3298438A (en) * | 1961-02-20 | 1967-01-17 | Atlantic Refining Co | Method for preventing corrosion |
| US4266607A (en) * | 1980-04-07 | 1981-05-12 | Mobil Oil Corporation | Method for protecting a carbon dioxide production well from corrosion |
| US5135053A (en) * | 1991-05-09 | 1992-08-04 | Atlantic Richfield Company | Treatment of well tubulars with gelatin |
| US5186972A (en) * | 1991-06-06 | 1993-02-16 | Becton, Dickinson And Company | Method for lubricating articles |
| US5254366A (en) * | 1992-04-06 | 1993-10-19 | Atlantic Richfield Company | Method of treating tubulars with ungelled gelatin |
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