CA2378073A1 - Method for treatment of underground reservoirs - Google Patents

Method for treatment of underground reservoirs Download PDF

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Publication number
CA2378073A1
CA2378073A1 CA002378073A CA2378073A CA2378073A1 CA 2378073 A1 CA2378073 A1 CA 2378073A1 CA 002378073 A CA002378073 A CA 002378073A CA 2378073 A CA2378073 A CA 2378073A CA 2378073 A1 CA2378073 A1 CA 2378073A1
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CA
Canada
Prior art keywords
reservoir
catalyst
ester
treatment fluid
treatment
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.)
Granted
Application number
CA002378073A
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French (fr)
Other versions
CA2378073C (en
Inventor
Ralph Edmund Harris
Ian Donald Mckay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cleansorb Ltd
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Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2378073A1 publication Critical patent/CA2378073A1/en
Application granted granted Critical
Publication of CA2378073C publication Critical patent/CA2378073C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/84Compositions based on water or polar solvents
    • C09K8/86Compositions based on water or polar solvents containing organic compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/62Compositions for forming crevices or fractures
    • C09K8/72Eroding chemicals, e.g. acids

Abstract

A method for treating an underground reservoir, which method comprises introducing into the reservoir a treatment fluid comprising, dissolved or dispersed in water, an ester and a non-enzyme catalyst capable of increasing the rate of hydrolysis of the ester, such that the ester hydrolyses to produ ce an organic acid to dissolve acid soluble material present within the reservo ir.

Claims (45)

1. A method for treating an underground reservoir, which method comprises introducing into the reservoir a treatment fluid comprising, dissolved or dispersed in water, an ester and a non-enzyme catalyst capable of increasing the rate of hydrolysis of the ester, such that the ester hydrolyses to produce an organic acid in situ to dissolve acid soluble material present within the reservoir.
2. A method according to claim 1 wherein the fluid further includes a polymer breaker to degrade polymers.
3. A method according to claim 1 or 2 wherein the underground reservoir is a hydrocarbon reservoir.
4. A method according to claim 3 which further comprises recovering a hydrocarbon from the treated reservoir.
5. A method according to claim 3 or 4 wherein the hydrocarbon is oil.
6. A method according to claim 3 or 4 wherein the hydrocarbon is a gas.
7. A method according to claim 1 wherein the underground reservoir is a water reservoir.
8. A method according to claim 7 which further comprises recovering water from the treated reservoir.
9. A method according to any one of the preceding claims wherein the ester is a carboxylic acid ester.
10. A method according to any one of the preceding claims wherein the ester is an ester of an aliphatic carboxylic acid of formula RCO2H wherein R is hydrogen, an alkyl group having from 1 to 6 carbon atoms or -R'-CO2H
where R' is a bond or an alkylene group having from 1 to 6 carbon atoms, the said alkyl or alkylene group being unsubstituted or substituted by halogen or hydroxy.
11. A method according to any one of the preceding claims wherein the ester is 1,2,3-propanetriol triacetate, 1,2,3-propanetriol diacetate, ethylene glycol diacetate, diethylene glycol diacetate or triethylene glycol diacetate.
12. A method according to any one of the preceding claims wherein the catalyst is a metal ion.
13. A method according to any one of the preceding claims wherein the catalyst is a transition metal ion.
14. A method according to any one of claims 1 to 11 wherein the catalyst comprises a metal ion.
15. A method according to any one of claims 1 to 11 or 14 wherein the catalyst comprises a transition metal ion.
16. A method according to any one of claims 1 to 11 wherein the catalyst is an organic molecule.
17. A method according to any one of claims 1 to 11, 14 and 15 wherein the catalyst comprises an organic molecule.
18. A method according to any one of claims 1 to 11, 14, 15 and 17 wherein the catalyst is formed from a combination of a metal ion and an organic molecule.
19. A method according to any one of claims 1 to 11, 15 and 17 wherein the catalyst is formed from a combination of a transition metal ion and an organic molecule.
20. A method according to any one of claims 13, 15 and 19 wherein the transition metal is zinc, copper, nickel, cobalt, iron, manganese, chromium, vanadium, titanium, scandium or molybdenum.
21. A method according to any one of claims 16 to 19 wherein the organic molecule is an amino acid, peptide, monosaccharide, oligosaccharide, nucleic acid or peptide nucleic acid or a modified or cyclic amino acid, peptide, monosaccharide, oligosaccharide, nucleic acid or peptide nucleic acid.
22. A method according to claim 2 wherein the polymer breaker is a hydrolase enzyme.
23. A method according to claim 22 wherein the polymer breaker is a polysaccharide hydrolysing enzyme.
24. A method according to claim 23 wherein the polymer breaker is an enzyme which can hydrolyse starch, xanthan, cellulose, guar, scleroglucan or succinoglycan or derivatives of these polymers.
25. A method according to claim 2 wherein the polymer breaker is an oxidant.
26. A method according to claim 25 wherein the polymer breaker is a persulphate, hypochlorite, peroxide, perborate, percarbonate, perphosphate, persilicate, a metal cation or a hydrogen peroxide adduct.
27. A method according to claim 26 wherein the hydrogen peroxide adduct is urea hydrogen peroxide or magnesium peroxide.
28. A method according to claim 2 wherein the polymer breaker is a non-enzyme catalyst capable of increasing the rate of hydrolysis of the polymer.
29. A method according to any one of the preceding claims wherein the treatment fluid further comprises a peroxide to generate a peracid polymer breaker in situ.
30. A method according to any one of the preceding claims wherein the treatment fluid is introduced into the reservoir via a wellbore which extends to the reservoir.
31. A method according to claim 30 wherein the wellbore is vertical, deviated, inclined or horizontal .
32. A method according to any one of claims 1 to 29 wherein the treatment fluid is introduced into the reservoir via the drillstring.
33. A method according to any one of claims 1 to 29 wherein the treatment fluid is introduced into the reservoir via coiled tubing.
34. A method according to any one of claims 1 to 29 wherein the treatment fluid is introduced into the reservoir via bullheading of the fluid.
35. A method according to any one of the preceding claims wherein one or more components of the treatment fluid is in the form of a delayed release preparation.
36. A method according to any one of the preceding claims which comprises introducing the treatment fluid into the reservoir by injecting it at a rate below the reservoir fracture pressure.
37. A method according to any one of claims 1 to 35 which comprises introducing the treatment fluid into the reservoir by injecting it at a rate above the reservoir fracture pressure.
38. A method according to any one of the preceding claims wherein the reservoir is or includes a carbonate rock structure.
39. A method according to any one of the preceding claims wherein the object of the treatment is to increase the rate of production of wells drilled into the formation.
40. A method according to any one of claims 1 to 38 wherein the object of the treatment is to increase the permeability of the formation.
41. A method according to any one of claims 1 to 38 wherein the object of the treatment is the removal of a filter cake.
42. A method according to any one of claims 1 to 38 wherein the object of the treatment is the removal of a filter cake following a gravel packing operation.
43. A method according any one of claims 1 to 38 wherein the object of the treatment is the removal of a biofilm.
44. A method according to any one of the preceding claims wherein the treatment fluid further includes an esterase, lipase or protease enzyme.
45. A method according to any one of the preceding claims wherein the catalyst is present in whole or in part in the brine used for drilling or workovers of the underground formation.
CA002378073A 1999-07-02 2000-07-03 Method for treatment of underground reservoirs Expired - Lifetime CA2378073C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9915354.6A GB9915354D0 (en) 1999-07-02 1999-07-02 Method for treatment of underground reservoirs
GB9915354.6 1999-07-02
PCT/GB2000/002558 WO2001002698A1 (en) 1999-07-02 2000-07-03 Method for treatment of underground reservoirs

Publications (2)

Publication Number Publication Date
CA2378073A1 true CA2378073A1 (en) 2001-01-11
CA2378073C CA2378073C (en) 2009-11-10

Family

ID=10856394

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002378073A Expired - Lifetime CA2378073C (en) 1999-07-02 2000-07-03 Method for treatment of underground reservoirs

Country Status (5)

Country Link
US (1) US6702023B1 (en)
AU (1) AU5696200A (en)
CA (1) CA2378073C (en)
GB (1) GB9915354D0 (en)
WO (1) WO2001002698A1 (en)

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CA2378073C (en) 2009-11-10

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