WO2004061046B1 - Aerogels effective to reduce drilling fluid density - Google Patents

Aerogels effective to reduce drilling fluid density

Info

Publication number
WO2004061046B1
WO2004061046B1 PCT/US2003/041734 US0341734W WO2004061046B1 WO 2004061046 B1 WO2004061046 B1 WO 2004061046B1 US 0341734 W US0341734 W US 0341734W WO 2004061046 B1 WO2004061046 B1 WO 2004061046B1
Authority
WO
WIPO (PCT)
Prior art keywords
system fluid
aerogels
fluids
fluid
density
Prior art date
Application number
PCT/US2003/041734
Other languages
French (fr)
Other versions
WO2004061046A1 (en
Inventor
Charles W Alsobrook
Thomas A Jones
Original Assignee
Baker Hughes Inc
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 Baker Hughes Inc filed Critical Baker Hughes Inc
Priority to AU2003300150A priority Critical patent/AU2003300150A1/en
Publication of WO2004061046A1 publication Critical patent/WO2004061046A1/en
Publication of WO2004061046B1 publication Critical patent/WO2004061046B1/en

Links

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
    • C09K8/50Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/502Oil-based compositions
    • 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
    • C09K8/02Well-drilling compositions
    • C09K8/03Specific additives for general use in well-drilling compositions
    • C09K8/032Inorganic additives
    • 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
    • C09K8/02Well-drilling compositions
    • C09K8/03Specific additives for general use in well-drilling compositions
    • C09K8/035Organic additives
    • 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
    • C09K8/02Well-drilling compositions
    • C09K8/32Non-aqueous well-drilling compositions, e.g. oil-based
    • C09K8/34Organic liquids
    • 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
    • C09K8/50Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504Compositions based on water or polar solvents
    • 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
    • C09K2208/00Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/18Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts

Abstract

Use of aerogels reduce the density of system fluids useful during drilling operations and system fluids comprising aerogels.

Claims

AMENDED CLAIMS [Received by the International Bureau on 03 August 2004 (03.08.2004); original claims 1-60 replaced by amended claims 1-62
1. A system fluid having effective rheology comprising an amount of one or more aerogels comprismg particles comprising a bubble matrix comprising retained gas, said aerogels being effective to reduce density of said system fluid compared to the same system fluid absent said amount of said one or more aerogels.
2. The system fluid of claim 1 selected from the group consisting of drilling fluids, drill-in fluids, completion fluids, workover fluids, spotting fluids, and cementing fluids.
3. The system fluid of claim 1 comprising a drilling system fluid selected from the group consisting of drilling fluids, drill-in fluids, completion fluids, workover fluids, and spotting fluids.
4. The system fluid of claims 1-2 and 3 wherein said one or more aerogels comprise one or more inorganic aerogels.
5. The system fluid of claims 1-2 and 3 wherein said one or more aerogels comprise one or more organic aerogels,
6. The system fluid of claims 1-4 and 5 wherein said one or more aerogels are hydrophilic,
7. The system fluid of claim 1-5 and 6 wherein said one or more aerogels comprise an element selected from the group consisting of silicon, aluminum, titanium, zirconium, tin, lithium, cerium, vanadium, and mixtures thereof.
8. The system fluid of claims 1-6 and 7 wherein said one or more aerogels comprise silicon.
26
9. The system fluid of claims 1-7 and 8 wherein said one or more aerogels comprise silicon oj de.
10. The system fluid of claims 1-S and 9 wherein said one or more aerogels comprise particles having an average diameter of about 200 μm or less.
11. The system fluid of claims 1-9 and 10 wherein said one or more aerogels comprising particles having an average diameter of about 1 μm or more.
12. The system fluid of claims 1-8 and 9 wherein said one or more aerogels comprises particles having an average diameter of from about 1 μm to about 44 μm.
13. The system fluid of claims 1-11 and 12 wherein said one or more aerogels comprise particles having a particle size distribution effective to bridge pores in a subterranean formation.
14. The system fluid of claims 1-12 and 13 wherein said one or more aerogels comprise particles having a particle size distribution which produces an effective filter cake during drilling operations.
15. The system fluid of claims 1-13 and 14 wherein said one or more aerogels comprise particles having a density of about 0.2 g/cm3 or less.
16. The system fluid of claims 1-14 and 15 wherein said one or more aerogels comprise particles having a density of about 0.35 g/cm3 or less.
17. The system fluid of claims 1-13 and 14 wherein said one or more aerogels comprise particles having a density of from about 0.1 to about 0.35 g/cm .
IS. The system fluid of claims 1-16 and 17 wherein said one or more aerogels ι comprise particles comprising about 90% gas or more.
1 . The system fluid of claims 1-16 and 17 wherein said one or more aerogels comprises particles comprising about 95% gas or more.
20. The system, fluid of claims 1-18 and 19 wherein said one or more aerogels comprise particles having a total surface area of about 200 m2/g or more.
21. The system fluid of claims 1-1S and 19 wherein said one or more aerogels comprise particles having a total surface area of about 600 m2/g or more.
22. The system fluid of claims 1-18 and 19 wherein said one or more aerogels comprise particles having a total surface area of about 700 m2/g or more.
23. The system fluid of claims 1-21 and 22 wherein said retained gas is selected from the group consisting of air, oxygen, helium, nitrogen, carbon dioxide, and inert or low activity gases.
24. The system fluid of claims 1-21 and 22 wherein said retained gas comprises air.
25. The system fluid of claims 1-21 and 22 wherein said retained gas comprises helium.
26. The system fluid of claims 1 -24 and 25 wherein said one or more aerogels are stable at temperatures of about 150 °C or more.
27. The system fluid of claims 1-24 and 25 wherein said one or more aerogels are stable at temperatures of about 250 °C or more.
28. The system fluid of claims 1 -24 and 25 wherein said one or more aerogels are stable at temperatures of about 350 °C or more.
29. The system fluid of claims 1-24 and 25 wherein said one or more aerogels are stable al temperatures of about 450 °C. or more.
28
30. The system fluid of claims 1-24 and 25 wherein said one or more aerogels are stable at temperatures ©f about 600 °C or more.
31. The system fluid of claims 1-29 and 30 wherein said one or more aerogels comprise NANOGEL®.
32. Th© system fluid of claims 1-30 and 31 wherein said amount of said one or more aerogels produces a system fluid density of from about 1 lb/gal to about 8 lb/gal.
33. The system fluid of claims 1-30 and 31 wherein said amount of said one or more aerogels produces a system fluid density of from about 3 lb/gal to about 6 lb/gal.
34. The system fluid of claims 1-32 and 33 wherein said system fluid is hydrophilic and said one or more aerogels are hydrophilic.
35. The system fluid of claims 1-32 and 33 wherein said system fluid is hydrophobic and said one or more aerogels are hydrophobic.
36. The system fluid of claims 1-34 and 35 wherein a filter cake comprising said one or more aerogels is converted to a gel upon exposure to one or more component selected from the group consisting of heat, a pH of from about 8 to about 13, and contact with water.
37. The system fluid of claims 1-35 and 36 wherein a borehole comprismg a filter cake comprising said one or more aerogels is cleaned in the absence of acid.
38. The system fluid of claims 1-36 and 37 wherein said system fluid is selected from the group consisting of water-based and oil-based fluid.
39. The system fluid of claims 1-37 and 38 wherein said system fluid comprises an oil selected from the group consisting of olefins, paraffins, water insoluble polyglycols,
29 water insoluble esters, diesel, water insoluble Fischer-Tropsch reaction products, other organic materials tlrøt are aon-toide at the concentrations used9 and combinations thereof.
40. The system fluid of claims 1-37 and 38 wherein said system fluid comprises one or more non-tosde synthetic olefins.
41. The system fluid of claims 1-37 and 38 wherein said system fluid comprises one or more non-toxic olefins selected from the group consisting of polyalphaolefms, linear alpha olefins, and internal olefins.
42. The system fluid of claims 1-37 and 38 wherein said system fluid is selected from the group consisting of PERFFLOW® and SCIFLOW™.
43. The system fluid of claims 1-41 and 42 wherein the amount of said one or more aerogels produces a system fluid density of from about 1 lb/gal to about 8 lb/gal.
44. The system fluid of claims 1-41 and 42 wherein the amount of said one or more aerogels produces a system fluid density of from about 3 lb/gal to about 6 lb/gal.
45. The system fluid of claims 1-43 and 44 wherein said amount of said one or more aerogels is from about 55 to about 62% of said system fluid.
46. A method comprising using the system fluid of any of claims 1-44 and 45 during drilling operations.
47. The method of claim 46 further comprising effectively bridging pores in a formation during said drilling operations with a bridging agent comprising said one or more aerogels.
48. The method of claims 46 and 47 further comprising producing an effective filter cake comprising said one or more aerogels during said drilling operations.
30
49. The method of claim 48 further comprising converting said filter cake to a gel upon exposure to one or more component selected from the group consisting of heat, a pH of from about § to about 13S and contact with water.
50. The method of claim 4 further comprising effectively cleaning a borehole comprising said filter cake in the absence of acid.
51. A method for reducing density of fluids useful during drilling operations comprising providing a quantity of a system fluid comprising an amount of one or more aerogels comprising particles comprising a bubble matrix comprising retained gas, the system fluid having effective rheology and lubricity properties and having a reduced density compared to the same system fluid absent said amount of said one or more aerogels.
52. The method of claim 51 wherein said system fluid is selected from the group consisting of drilling fluids, drill-in fluids, completion fluids, workover fluids, spotting fluids, and cementing fluids.
53. The method of claim 51 wherein said system fluid is a drilling system fluid selected from the group consisting of drilling fluids, drill-in fluids, completion fluids, workover fluids, and spotting fluids.
54. The method of claims 51 -52 and 53 further comprising effectively bridging pores in a formation during said drilling operations using a bridging agent comprising said one or more aerogels.
55. The method of claims 51 -53 and 54 further comprising producing an effective filter cake comprising said one or more aerogels during said drilling operations.
31
56. The method of claims 51-54 and 55 wherein said amount of said one or more aerogels is effective to produce a system fluid density of from about 1 lb/gal to shout 8 lb/gal.
57. The method of claims 51 -54 and 55 wherein said amount of said one or more aerogels is effective to produce a system fluid density of from about 3 lb/gal to about 6 lb/gal.
58. The method of claims 55-56 and 57 further comprising converting said filter cake to a gel upon exposure to one or more component selected from the group consisting of heat, a pH of from about 8 to about 13, and contact with water.
59. The method of claims 55-56 and 57 further comprising cleaning a borehole comprising said filter cake in the absence of acid.
60. The system fluid of claims 51-58 and 59 wherein said amount of said one or more aerogels is from about 55 to about 62% of said system fluid.
61. The system fluid of claims 51-59 and 60 wherein said amount of said one or more aerogels comprise particles having a density of about 0.35 g/cm3 or less.
62. The system fluid of claims 51 -60 and 1 wherein said amount of said one or more aerogels comprise particles comprising about 90% gas or more.
32
PCT/US2003/041734 2002-12-31 2003-12-31 Aerogels effective to reduce drilling fluid density WO2004061046A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003300150A AU2003300150A1 (en) 2002-12-31 2003-12-31 Aerogels effective to reduce drilling fluid density

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43730502P 2002-12-31 2002-12-31
US60/437,305 2002-12-31

Publications (2)

Publication Number Publication Date
WO2004061046A1 WO2004061046A1 (en) 2004-07-22
WO2004061046B1 true WO2004061046B1 (en) 2004-09-23

Family

ID=32713165

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/041734 WO2004061046A1 (en) 2002-12-31 2003-12-31 Aerogels effective to reduce drilling fluid density

Country Status (3)

Country Link
US (2) US8034749B2 (en)
AU (1) AU2003300150A1 (en)
WO (1) WO2004061046A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8034749B2 (en) 2002-12-31 2011-10-11 Baker Hughes Incorporated Aerogels effective to reduce drilling fluid density
MY144810A (en) 2005-10-20 2011-11-15 Transocean Sedco Forex Ventures Ltd Apparatus and method for managed pressure drilling
US20090140444A1 (en) * 2007-11-29 2009-06-04 Total Separation Solutions, Llc Compressed gas system useful for producing light weight drilling fluids
US20090188721A1 (en) * 2008-01-30 2009-07-30 Smith Kevin W Membrane method of making drilling fluids containing microbubbles
US20120186877A1 (en) * 2010-08-13 2012-07-26 Ezell Ryan G Modified Cellulosic Polymer for Improved Well Bore Fluids
US20130149549A1 (en) * 2011-12-12 2013-06-13 Nicholas Francis Borrelli Metallic structures by metallothermal reduction
AU2013280867A1 (en) * 2012-06-29 2015-01-22 Baker Hughes Incorporated Low-density downhole fluids and uses therof
US10858570B2 (en) * 2012-07-17 2020-12-08 Dow Global Technologies Llc Aqueous cement compositions incorporating particles that are activated to control rheology when water soluble portions of the particles are released in the presence of water
US9506317B2 (en) * 2014-01-21 2016-11-29 Baker Hughes Incorporated Method of improving cleanout of a wellbore
US20180346793A1 (en) * 2017-06-02 2018-12-06 Saudi Arabian Oil Company Low-density gels and composites for protecting underground electric components from chemical damage
CA3125298A1 (en) 2019-07-01 2021-01-07 Highland Fluid Technology, Inc. Managed pressure drilling with noncompressible light weight fluid
CA3153304A1 (en) 2019-09-05 2021-03-11 Saudi Arabian Oil Company Propping open hydraulic fractures
US20230265333A1 (en) * 2020-06-29 2023-08-24 Saudi Arabian Oil Company Low-density treatment fluid and methods for treating their zones located above pay zones
US11326092B2 (en) 2020-08-24 2022-05-10 Saudi Arabian Oil Company High temperature cross-linked fracturing fluids with reduced friction
US11891564B2 (en) 2022-03-31 2024-02-06 Saudi Arabian Oil Company Systems and methods in which colloidal silica gel is used to resist corrosion of a wellhead component in a well cellar
US11680201B1 (en) 2022-03-31 2023-06-20 Saudi Arabian Oil Company Systems and methods in which colloidal silica gel is used to seal a leak in or near a packer disposed in a tubing-casing annulus

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093454A (en) * 1934-10-01 1937-09-21 Samuel S Kistler Method of producing aerogels
US2109337A (en) * 1935-09-09 1938-02-22 Corona Products Inc Amorphous silica drilling fluid
US2455188A (en) * 1946-02-25 1948-11-30 Sun Oil Co Drilling fluid
US2584085A (en) * 1948-07-20 1952-01-29 Shell Dev Lubricant
US3122520A (en) * 1959-10-05 1964-02-25 Dow Corning Method of making silicone rubber fillers
GB1171409A (en) 1966-06-15 1969-11-19 Cabot Corp Siliceous Rheological Agents
US3951824A (en) * 1973-02-12 1976-04-20 Continental Oil Company Dry drilling fluid composition
US5350395A (en) * 1986-04-15 1994-09-27 Yock Paul G Angioplasty apparatus facilitating rapid exchanges
NO912006D0 (en) 1991-05-24 1991-05-24 Sinvent As PROCEDURE FOR THE MANUFACTURE OF A SILICA-AEROGEL-LIKE MATERIAL.
US5565142A (en) 1992-04-01 1996-10-15 Deshpande; Ravindra Preparation of high porosity xerogels by chemical surface modification.
US5527753A (en) * 1994-12-13 1996-06-18 Fmc Corporation Functionalized amine initiators for anionic polymerization
US5728652A (en) 1995-02-10 1998-03-17 Texas United Chemical Company, Llc. Brine fluids having improved rheological charactersitics
US5501277A (en) * 1995-03-06 1996-03-26 Halliburton Company Combating lost circulation during the drilling of wells
US5605879A (en) * 1995-04-17 1997-02-25 Baker Hughes Incorporated Olefin isomers as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids
US5728654A (en) * 1995-08-25 1998-03-17 Texas United Chemical Company, Llc. Stabilized fluids containing soluble zinc
DE19548128A1 (en) * 1995-12-21 1997-06-26 Hoechst Ag Nonwoven airgel composite material containing at least one thermoplastic fiber material, process for its production and its use
US5837655A (en) * 1996-05-01 1998-11-17 Halliday; William S. Purified paraffins as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids
DE19718740A1 (en) * 1997-05-02 1998-11-05 Hoechst Ag Process for the granulation of aerogels
DE19752456A1 (en) * 1997-11-26 1999-05-27 Hoechst Ag Production of organically modified silica aerogel
US6131661A (en) * 1998-08-03 2000-10-17 Tetra Technologies Inc. Method for removing filtercake
JP3414652B2 (en) * 1998-10-12 2003-06-09 敷島製パン株式会社 Wheat flour baked product, its production method and quality improving agent
DE60334451D1 (en) * 2002-04-16 2010-11-18 Texas United Chemical Corp VISCOUS OIL FLUIDS AND THEIR USE AS DRILLING RINSING
US8034749B2 (en) 2002-12-31 2011-10-11 Baker Hughes Incorporated Aerogels effective to reduce drilling fluid density

Also Published As

Publication number Publication date
US20070056731A1 (en) 2007-03-15
WO2004061046A1 (en) 2004-07-22
US20040147405A1 (en) 2004-07-29
US8034749B2 (en) 2011-10-11
AU2003300150A1 (en) 2004-07-29
US7303013B2 (en) 2007-12-04

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