WO2006030386B1 - Solid sandstone dissolver - Google Patents

Solid sandstone dissolver

Info

Publication number
WO2006030386B1
WO2006030386B1 PCT/IB2005/053005 IB2005053005W WO2006030386B1 WO 2006030386 B1 WO2006030386 B1 WO 2006030386B1 IB 2005053005 W IB2005053005 W IB 2005053005W WO 2006030386 B1 WO2006030386 B1 WO 2006030386B1
Authority
WO
WIPO (PCT)
Prior art keywords
acid
composition
solid
precursor
fluoride
Prior art date
Application number
PCT/IB2005/053005
Other languages
French (fr)
Other versions
WO2006030386A3 (en
WO2006030386A2 (en
Inventor
J Ernest Brown
John W Still
Diankui Fu
Zhijun Xiao
Wayne Frenier
Original Assignee
Schlumberger Ca Ltd
Schlumberger Services Petrol
Schlumberger Holdings
Schlumberger Technology Bv
J Ernest Brown
John W Still
Diankui Fu
Zhijun Xiao
Wayne Frenier
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 Schlumberger Ca Ltd, Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology Bv, J Ernest Brown, John W Still, Diankui Fu, Zhijun Xiao, Wayne Frenier filed Critical Schlumberger Ca Ltd
Priority to EA200700643A priority Critical patent/EA010498B1/en
Publication of WO2006030386A2 publication Critical patent/WO2006030386A2/en
Publication of WO2006030386A3 publication Critical patent/WO2006030386A3/en
Publication of WO2006030386B1 publication Critical patent/WO2006030386B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures

Abstract

A dry solid composition is disclosed that, when added to an aqueous liquid, provides a slurry that can be used in sandstone acid fracturing. The slurry generates hydrofluoric acid downhole to etch the sandstone fracture faces created. The chemical and physical properties of the composition result in very uneven etching of the fracture faces, enhancing the fluid conductivity of the final fracture. Optionally, inert masking materials may be included in the dry composition, or added to the slurry, to increase the inhomogeneity of the etching and further increase the fluid conductivity.

Claims

AMENDED CLAIMS[Received by the International Bureau on 27 April 2006 (27.04.06): original claims 1-12 replaced by amended claims 1-12]
1. A water-free composition, for fracturing comprising particles of a solid acid-precursor and particles of a solid that releases hydrogen fluoride in the presence of aqueous acid.
2. The composition of claim 1 wherein said solid acid-precursor is selected from lactide, glycolide, polylactic acid, polyglycolic acid, copolymers of polylactic acid and polyglycolic acid, copolymers of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, copolymers of lactic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and mixtures thereof.
3. The composition of claim 1 or claim 2 wherein said solid acid-precursor is coated with an effective amount of a material that slows hydrolysis of said solid acid- precursor when said solid acid-precursor is contacted with an aqueous fluid.
4. The composition of any of the preceding claims wherein said solid that releases hydrogen fluoride in the presence of aqueous acid is selected from ammonium fluoride, ammonium bifluoride, polyvinylammoniura fluoride, polyvinylpyridiniurn fluoride, pyridinium fluoride, imidazolium fluoride, sodium tetrafluorobαrate, ammonium tetrafluoroborate, salts of hexafluoroantimony, TEFLON™ synthetic resinous fluorine-containing polymer, and mixtures thereof, and any of the above coated to slow the release of hydrogen fluoride.
5. The composition of any of the preceding claims wherein said particles of said solid acid-precursor and said particles of said solid that releases hydrogen fluoride in the presence of aqueous acid differ in one or more than one of properties selected from size, shape, surface area, and hydrolysis rate.
6. The composition of any of the preceding claims further comprising particles of an inert solid.
7. The composition of claim 6 wherein said inert solid particles are selected from plastic, glass, polyacrylamide, phenol formaldehyde polymer, nylon, wax, natural rubber, synthetic rubber, vermiculite, organic seeds, organic shells, mica, cellophane flakes, starch, rock salt, benzoic acid, metals, naphthalene, and mixtures thereof.
8. The composition of any of the preceding claims further comprising a chelating agent for one or more than one of the ions selected from calcium, aluminum and magnesium.
9. An aqueous fluid forfracturing, made by mixing the composition of any of the preceding claims with water.
10. The composition of claim 9 buffered to a pH of 6.0 or greater.
11. The composition of claim 9 or claim 10 further wherein either the solid acid precursor or the solid that releases hydrogen fluoride or both are coated with hydrocarbon.
12. A method of creating a fracture in a subterranean formation penetrated by a wellbore comprising:
a. preparing a fluid comprising the composition of any of the preceding claims,
b. injecting said fluid into said formation above fracture pressure, and
c. allowing at least a portion of said solid acid-precursor to hydrolyze.
PCT/IB2005/053005 2004-09-15 2005-09-13 Solid sandstone dissolver WO2006030386A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EA200700643A EA010498B1 (en) 2004-09-15 2005-09-13 Water-free composition for hydraulic fracturing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/941,355 US20060054325A1 (en) 2004-09-15 2004-09-15 Solid sandstone dissolver
US10/941,355 2004-09-15

Publications (3)

Publication Number Publication Date
WO2006030386A2 WO2006030386A2 (en) 2006-03-23
WO2006030386A3 WO2006030386A3 (en) 2006-05-11
WO2006030386B1 true WO2006030386B1 (en) 2006-12-14

Family

ID=35851114

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/053005 WO2006030386A2 (en) 2004-09-15 2005-09-13 Solid sandstone dissolver

Country Status (4)

Country Link
US (2) US20060054325A1 (en)
AR (1) AR051570A1 (en)
EA (1) EA010498B1 (en)
WO (1) WO2006030386A2 (en)

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Also Published As

Publication number Publication date
US7540328B2 (en) 2009-06-02
EA010498B1 (en) 2008-10-30
EA200700643A1 (en) 2007-08-31
US20060054325A1 (en) 2006-03-16
WO2006030386A3 (en) 2006-05-11
US20080006409A1 (en) 2008-01-10
AR051570A1 (en) 2007-01-24
WO2006030386A2 (en) 2006-03-23

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