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1. WO2001077491 - PROCEDE DE POLISSAGE ELECTROLYTIQUE POUR PRODUITS TUBULAIRES ET TIGE DE FORAGE DESTINES A DES CHAMPS DE PETROLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims
What is claimed is:

1. A down-hole tubular with reduced corrosion, clogging, and fluid flow friction while producing fluids from a fluid producing formation, the down-hole tubular comprising:
a tubular body having a sidewall made of a corrosion resistant alloy, the sidewall having a chromium content of at least 9% by weight throughout;
wherein the sidewall up the tubular body defines an inside diameter surface interior to the sidewall, the inside diameter surface having been subjected to an electropolishing process, the resulting electropolished inside diameter surface having an arithmetic roughness value of less than 100 micro inches.

2. The down-hole tubular according to claim 1, wherein the chromium content is less than 75% by weight.

3. The down-hole tubular according to claim 1 , wherein the chromium content is about 60% by weight.

4. The down-hole tubular according to claim 1 , wherein the arithmetic roughness value is less than 50 micro inches.

5. The down-hole tubular according to claim 1, wherein the arithmetic roughness value is about 30 micro inches or less.

6. The down-hole tubular according to claim 1, wherein the length of the tubular body is at least twenty-five feet, and the tubular body has an outside diameter up to about eleven inches.

7. The down-hole tubular according to claim 1, wherein the length of the tubular body is at least twenty-five feet, and the inside diameter is at least one inch.

8. The down-hole tubular according to claim 1, wherein the length of the tubular body is between about two feet and about 10 feet, and the inside diameter is at least one inch.

9. The down-hole tubular according to claim 1, wherein the tubular body has an outside diameter in the range from about 2-1/16 inches to about 10-3/4 inches.

10. A tubular member having improved flow characteristics for the transport of fluids, the tubular member comprising:
a tubular body having a sidewall made of a corrosion resistant alloy, the sidewall having a chromium content of at least 9% by weight throughout;
the sidewall of the tubular body defining an inside diameter surface to the side wall, the inside diameter surface having been subjected to an electropolishing process, the resulting electropolished inside diameter surface having an arithmetic roughness value of less than 100 micro inches; and
the tubular body having an outside diameter in the range from about 2-1/16 inches to about 10-3/4 inches.

11. The tubular member according to claim 10, wherein the tubular body ranges in length from about 28 to 45 feet.

12. The tubular member according to claim 10, wherein the yield strength of the tubular body is in the range of about 50,000 pounds per square inch to about 150,000 pounds per square inch.

13. A method of producing fluids through a well bore extending from a fluid-producing formation to the earth's surface, the method comprising the steps of:
providing a plurality of down-hole tubulars, each down-hole tubular being made of a corrosion resistant alloy, each down-hole tubular having an inside diameter and an inside diameter surface;
subjecting each inside diameter surface to a chemical pickling treatment to remove contaminants from each inside diameter surface;
subjecting each inside diameter surface to a mechanical finishing treatment;
subjecting each inside diameter surface to an electropolishing treatment to produce a smooth surface having an arithmetic roughness value of less than 100 micro inches;
subjecting each inside diameter surface to a post-electropolishing treatment to remove byproducts of the electropolishing treatment and assist drying;
connecting the plurality of down-hole tubulars together to form a production pipe;
locating the production pipe within the well bore adjacent the fluid-producing formation; and
producing the fluids to the earth's surface through the inside diameter of the down-hole tubulars.

14. The method according to claim 13, wherein the corrosion resistant alloy has at least 9% by weight of chromium.

15. The method according to claim 13, wherein the corrosion resistant alloy has less than 75% by weight of chromium.

16. The method according to claim 13, wherein the corrosion resistant alloy has about 60% by weight of chromium.

17. The method according to claim 13 , wherein the smooth surface has an arithmetic roughness value of less than 70 micro inches.

18. The method according to claim 13 , wherein the smooth surface has an arithmetic roughness value of about 30 micro inches.

19. The method according to claim 13, wherein the step of subjecting each inside diameter surface to a cleansing treatment comprises the steps of: subjecting each inside diameter surface to a dilute nitric/hydrofluoric acid solution which is pumped into the inside diameter of the tubulars.

20. The method according to claim 13, wherein the step of subjecting each inside diameter surface to an electropolishing treatment comprises the steps of:
conductively coupling each inside diameter surface to a cathode of a direct current power source;
contacting each inside diameter surface with a preselected electrolyte solution;
conductively coupling a conductor to an anode of the direct current power source;
submerging the conductor in the electrolyte solution;
electropolishing each inside diameter surface by supplying a current from the direct current power source;
removing the electrolyte solution from each inside diameter surface after each inside diameter surface has been electropolished; and
counter-flow rinsing each inside diameter surface to remove and recover the electropolishing solution.

21. The method according to claim 13, wherein the step of subjecting each inside diameter surface to a post-electropolishing treatment comprises the steps of:
soaking each inside diameter surface in dilute nitric acid to remove chemical residues and byproducts of the electropolishing treatment;
rinsing each inside diameter surface with water to remove remaining traces of chemical byproducts and residue.

22. The method according to claim 13, wherein the step of subjecting each inside diameter surface to a mechanical finishing step includes honing the inside diameter surface of each tubular with a brush consisting of hardened carbide beads formed on the ends of polyester brush bristles.

23. A down-hole tubular with reduced corrosion, clogging, and fluid flow friction while producing fluids from a fluid producing formation, the down-hole tubular comprising:
a tubular body having a sidewall formed of a carbon steel alloy which defines an inside diameter surface interior to the sidewall, the inside diameter surface having been subjected to an electropolishing process, the resulting electropolished inside diameter surface having an arithmetic roughness value of less than 100 micro inches.

24. The down-hole tubular according to claim 23, wherein the arithmetic roughness value is less than 50 micro inches.

25. The down-hole tubular according to claim 23, wherein the arithmetic roughness value is about 30 micro inches or less.

26. The down-hole tubular according to claim 23, wherein the length of the tubular body is at least twenty-five feet, and the tubular body has an outside diameter up to about eleven inches.

27. The down-hole tubular according to claim 23, wherein the length of the tubular body is at least twenty-five feet, and the inside diameter is at least one inch.

28. The down-hole tubular according to claim 23, wherein the length of the tubular body is between about two feet and about 10 feet, and the inside diameter is at least one inch.

29. The down-hole tubular according to claim 23 , wherein the electropolished inside diameter surface has an arithmetic roughness value of less than 70 micro inches.

30. The down-hole tubular according to claim 23, wherein the electropolished inside diameter surface has an arithmetic roughness value of about 30 micro inches.

31. The down-hole tubular according to claim 23, wherein the tubular body has an outside diameter in the range from about 2-1/16 inches to about 10-3/4 inches.

32. A tubular member having improved flow characteristics for the transport of fluids, the tubular member comprising:
a tubular body having a sidewall formed of a carbon steel alloy, the sidewall of the tubular body defining an inside diameter surface to the side wall, the inside diameter surface having been subjected to an electropolishing process, the resulting electropolished inside diameter surface having an arithmetic roughness value of less than 100 micro inches; and
the tubular body having an outside diameter in the range from about 2-1/16 inches to about 10-3/4 inches.

33. The tubular member according to claim 23, wherein the tubular body ranges in length from about 28 to 45 feet.

34. The tubular member according to claim 23, wherein the yield strength of the tubular body is in the range of about 50,000 pounds per square inch to about 150,000 pounds per square inch.

35. A method of producing fluids through a well bore extending from a fluid-producing formation to the earth's surface, the method comprising the steps of:
providing a plurality of down-hole tubulars, each down-hole tubular being formed of a carbon steel alloy, each down-hole tubular having an inside diameter and an inside diameter surface;
subjecting each inside diameter surface to a chemical pickling treatment to remove contaminants from each inside diameter surface;
subjecting each inside diameter surface to a mechanical finishing treatment;
subjecting each inside diameter surface to an electropolishing treatment to produce a smooth surface having an arithmetic roughness value of less than 100 micro inches;
subjecting each inside diameter surface to a post-electropolishing treatment to remove byproducts of the electropolishing treatment and assist drying;
connecting the plurality of down-hole tubulars together to form a production pipe;
locating the production pipe within the well bore adjacent the fluid-producing formation;

and
producing the fluids to the earth's surface through the inside diameter of the down-hole tubulars.

36. The method according to claim 35, wherein the smooth surface has an arithmetic roughness value of less than 70 micro inches.

37. The method according to claim 35, wherein the smooth surface has an arithmetic roughness value of about 30 micro inches.

38. The method according to claim 35, wherein the step of subjecting each inside diameter surface to a cleansing treatment comprises the steps of:
subjecting each inside diameter surface to a dilute hydrochloric acid solution which is pumped into the inside diameter of the tubulars.

39. The method according to claim 35, wherein the step of subjecting each inside diameter surface to an electropolishing treatment comprises the steps of:
conductively coupling each inside diameter surface to a cathode of a direct current power source;
contacting each inside diameter surface with a preselected electrolyte solution;
conductively coupling a conductor to an anode of the direct current power source;
submerging the conductor in the electrolyte solution;
electropolishing each inside diameter surface by supplying a current from the direct current power source;
removing the electrolyte solution from each inside diameter surface after each inside diameter surface has been electropolished; and
counter-flow rinsing each inside diameter surface to remove and recover the electropolishing solution.

40. The method according to claim 35, wherein the step of subjecting each inside diameter surface to a post-electropolishing treatment comprises the steps of:

rinsing each inside diameter surface with water to remove remaining traces of chemical byproducts and residue;
drying each inside diameter surface to remove all moisture; and
applying a rust inhibitor treatment to each inside diameter surface.

41. The method according to claim 35, wherein the step of subjecting each inside diameter surface to a mechanical finishing step includes honing the inside diameter surface of each tubular with a brush consisting of hardened carbide beads formed on the ends of polyester brush bristles.

42. A drill pipe having reduced corrosion, clogging, and fluid flow friction while circulating fluids to complete a well bore, the drill pipe comprising:
a tubular body having a sidewall formed of carbon steel, the sidewall up the tubular body defining an inside diameter surface interior to the sidewall, the inside diameter surface having been subjected to an electropolishing process, the resulting electropolished inside diameter surface having an arithmetic roughness value of less than 100 micro inches; and
wherein the tubular body terminates in a pair of oppositely arranged upset ends, each of which presents an internal area of reduced flow, and wherein the internal areas of reduced flow are similarly subjected to an electropolishing process.

43. The drill pipe of claim 42, wherein the arithmetic roughness value is less than 50 micro inches.

44. The drill pipe of claim 42, wherein the arithmetic roughness value is about 30 micro inches or less.

45. The drill pipe of claim 42, wherein the length of the tubular body is at least twenty-five feet, and the tubular body has an outside diameter up to about seven inches.

46. The drill pipe of claim 42, wherein the length of the tubular body is at least twenty-five feet, and the inside diameter is at least one inch.

47. The drill pipe of claim 42, wherein the length of the tubular body is between about two feet and about 10 feet, and the inside diameter is at least one inch.

48. The drill pipe of claim 42, wherein the electropolished inside diameter surface has an arithmetic roughness value of less than 70 micro inches.

49. The drill pipe of claim 42, wherein the electropolished inside diameter surface has an arithmetic roughness value of about 30 micro inches.

50. The drill pipe of claim 42, wherein the tubular body has an outside diameter in the range from about 2-3/8 inches to about 6-5/8 inches.

51. The drill pipe of claim 42, wherein the tubular body ranges in length from about 28 to 45 feet.

52. The drill pipe of claim 42, wherein the yield strength of the tubular body is in the range of about 50,000 pounds per square inch to about 150,000 pounds per square inch.

53. A method of completing a well bore using a string of carbon steel drill pipe having a drill bit afixed thereto for disintegrating earthen formations, the method comprising the steps of:
providing a string of drill pipe made up of a plurality of pipe sections formed of carbon steel, each pipe section having an inside diameter and an inside diameter surface;
subjecting each inside diameter surface to a chemical pickling treatment to remove contaminants from each inside diameter surface;
subjecting each inside diameter surface to a mechanical finishing treatment;
subjecting each inside diameter surface to an electropolishing treatment to produce a smooth surface having an arithmetic roughness value of less than 100 micro inches;
subjecting each inside diameter surface to a post-electropolishing treatment to remove byproducts of the electropolishing treatment and assist drying;
connecting the plurality of pipe sections together to form the string of drill pipe;
afixing a drill bit to the drill pipe and running the string of drill pipe into the well bore; circulating drilling fluid down the inside diameter of the pipe string while drilling in order to cool the drill bit and circulate drill cuttings to the well surface.

54. The method according to claim 53, wherein the smooth surface has an arithmetic roughness value of less than 70 micro inches.

55. The method according to claim 53, wherein the step of subjecting each inside diameter surface to a cleansing treatment comprises the steps of:
subjecting each inside diameter surface to a dilute hydrochloric acid solution which is pumped into the inside diameter of the tubulars.

56. The method according to claim 53, wherein the step of subjecting each inside diameter surface to an electropolishing treatment comprises the steps of:
conductively coupling each inside diameter surface to a cathode of a direct current power source;
contacting each inside diameter surface with a preselected electrolyte solution;
conductively coupling a conductor to an anode of the direct current power source;
submerging the conductor in the electrolyte solution;
electropolishing each inside diameter surface by supplying a current from the direct current power source;
removing the electrolyte solution from each inside diameter surface after each inside diameter surface has been electropolished; and
counter-flow rinsing each inside diameter surface to remove and recover the electropolishing solution.

57. The method according to claim 53, wherein the step of subjecting each inside diameter surface to a post-electropolishing treatment comprises the steps of:

rinsing each inside diameter surface with water to remove remaining traces of chemical byproducts and residue;
drying each inside diameter surface to remove all moisture; and
applying a rust inhibitor treatment to each inside diameter surface.

58. The method according to claim 53, wherein the step of subjecting each inside diameter surface to a mechanical finishing step includes honing the inside diameter surface of each tubular with a brush consisting of hardened* carbide beads formed on the ends of polyester brush bristles.