WO2008004172A3 - Rheology controlled heterogeneous particle placement in hydraulic fracturing - Google Patents

Rheology controlled heterogeneous particle placement in hydraulic fracturing Download PDF

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Publication number
WO2008004172A3
WO2008004172A3 PCT/IB2007/052562 IB2007052562W WO2008004172A3 WO 2008004172 A3 WO2008004172 A3 WO 2008004172A3 IB 2007052562 W IB2007052562 W IB 2007052562W WO 2008004172 A3 WO2008004172 A3 WO 2008004172A3
Authority
WO
WIPO (PCT)
Prior art keywords
fracture
subterranean formation
rate
shear stress
treatment fluid
Prior art date
Application number
PCT/IB2007/052562
Other languages
French (fr)
Other versions
WO2008004172A2 (en
Inventor
Haiying Huang
Joseph A Ayoub
Philip F Sullivan
Original Assignee
Schlumberger Ca Ltd
Schlumberger Services Petrol
Schlumberger Holdings
Schlumberger Technology Bv
Pra Res And Dev N V
Haiying Huang
Joseph A Ayoub
Philip F Sullivan
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, Pra Res And Dev N V, Haiying Huang, Joseph A Ayoub, Philip F Sullivan filed Critical Schlumberger Ca Ltd
Priority to CA2656205A priority Critical patent/CA2656205C/en
Priority to EP07789858A priority patent/EP2041237A2/en
Priority to MX2008016219A priority patent/MX2008016219A/en
Priority to EA200970079A priority patent/EA013900B1/en
Publication of WO2008004172A2 publication Critical patent/WO2008004172A2/en
Publication of WO2008004172A3 publication Critical patent/WO2008004172A3/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • 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
    • C09K8/66Compositions based on water or polar solvents
    • C09K8/68Compositions 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
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/62Compositions for forming crevices or fractures
    • C09K8/66Compositions based on water or polar solvents
    • C09K8/68Compositions based on water or polar solvents containing organic compounds
    • C09K8/685Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
    • 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
    • C09K8/70Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
    • 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
    • C09K8/80Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • 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
    • C09K8/88Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/882Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C09K8/88Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/887Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • 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
    • C09K8/88Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/90Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • 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
    • C09K2208/08Fiber-containing well treatment fluids
    • 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
    • C09K2208/26Gel breakers other than bacteria or enzymes
    • 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
    • C09K2208/28Friction or drag reducing 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
    • C09K2208/00Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/30Viscoelastic surfactants [VES]

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

A method of treating a subterranean formation penetrated by a wellbore includes preparing a treatment fluid with shear thinning, non-monotonic rheological properties, injecting the treatment fluid into the subterranean formation, and inducing shear rate softening phase transition in the treatment fluid. The non-monotonic rheology properties can be such that in the relationship between shear stress (σ ) versus strain rate ( / ), where fx < j2 < /3 < /4, the shear stress values are σλ < σ2, (T3 < <T4, and <T3 < <T2. The method can heterogeneous Iy deposit proppant or solid acid in a fracture. A system to fracture a subterranean formation includes the fracturing fluid, a wellbore to inject the fracturing fluid to propagate a fracture in the formation, and a rate controller to inject the fracturing fluid into the subterranean formation at a minimum volumetric rate to provide a shear stress at an inlet to the fracture that exceeds CT2 - The method and system can achieve heterogeneous particle placement with either proppant or solid acid.
PCT/IB2007/052562 2006-07-03 2007-07-02 Rheology controlled heterogeneous particle placement in hydraulic fracturing WO2008004172A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA2656205A CA2656205C (en) 2006-07-03 2007-07-02 Rheology controlled heterogeneous particle placement in hydraulic fracturing
EP07789858A EP2041237A2 (en) 2006-07-03 2007-07-02 Rheology controlled heterogeneous particle placement in hydraulic fracturing
MX2008016219A MX2008016219A (en) 2006-07-03 2007-07-02 Rheology controlled heterogeneous particle placement in hydraulic fracturing.
EA200970079A EA013900B1 (en) 2006-07-03 2007-07-02 Method of treating a subterranean formation

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US81843206P 2006-07-03 2006-07-03
US60/818,432 2006-07-03
US11/769,009 2007-06-27
US11/769,009 US7798224B2 (en) 2006-07-03 2007-06-27 Rheology controlled heterogeneous particle placement in hydraulic fracturing

Publications (2)

Publication Number Publication Date
WO2008004172A2 WO2008004172A2 (en) 2008-01-10
WO2008004172A3 true WO2008004172A3 (en) 2008-04-03

Family

ID=38840109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/052562 WO2008004172A2 (en) 2006-07-03 2007-07-02 Rheology controlled heterogeneous particle placement in hydraulic fracturing

Country Status (6)

Country Link
US (1) US7798224B2 (en)
EP (1) EP2041237A2 (en)
CA (1) CA2656205C (en)
EA (1) EA013900B1 (en)
MX (1) MX2008016219A (en)
WO (1) WO2008004172A2 (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8763699B2 (en) 2006-12-08 2014-07-01 Schlumberger Technology Corporation Heterogeneous proppant placement in a fracture with removable channelant fill
US9085727B2 (en) 2006-12-08 2015-07-21 Schlumberger Technology Corporation Heterogeneous proppant placement in a fracture with removable extrametrical material fill
US7581590B2 (en) 2006-12-08 2009-09-01 Schlumberger Technology Corporation Heterogeneous proppant placement in a fracture with removable channelant fill
US8757259B2 (en) 2006-12-08 2014-06-24 Schlumberger Technology Corporation Heterogeneous proppant placement in a fracture with removable channelant fill
US9040468B2 (en) 2007-07-25 2015-05-26 Schlumberger Technology Corporation Hydrolyzable particle compositions, treatment fluids and methods
US10011763B2 (en) 2007-07-25 2018-07-03 Schlumberger Technology Corporation Methods to deliver fluids on a well site with variable solids concentration from solid slurries
ITVA20080004A1 (en) * 2008-01-16 2009-07-17 Lamberti Spa RHEOLOGY MODIFIER
US20130220619A1 (en) * 2010-05-12 2013-08-29 Schlumberger Technology Corporation Methods For High Solid Content Fluids in Oilfield Applications
US8919442B2 (en) * 2010-08-09 2014-12-30 Halliburton Energy Services, Inc. Method for coating a filter medium of a sand control screen assembly
US10001003B2 (en) 2010-12-22 2018-06-19 Maurice B. Dusseault Multl-stage fracture injection process for enhanced resource production from shales
EP2655795B1 (en) * 2010-12-22 2019-02-20 Maurice B. Dusseault Multi-stage fracture injection process for enhanced resource production from shales
US10526531B2 (en) 2013-03-15 2020-01-07 Schlumberger Technology Corporation Compositions and methods for increasing fracture conductivity
JP2014189989A (en) * 2013-03-26 2014-10-06 Showa Denko Kk Fracturing material
US9896923B2 (en) 2013-05-28 2018-02-20 Schlumberger Technology Corporation Synchronizing pulses in heterogeneous fracturing placement
US9523268B2 (en) 2013-08-23 2016-12-20 Schlumberger Technology Corporation In situ channelization method and system for increasing fracture conductivity
US20150053402A1 (en) * 2013-08-23 2015-02-26 Schlumberger Technology Corporation Fiber paste and methods for treating a subterranean formation with the fiber paste
US9631468B2 (en) 2013-09-03 2017-04-25 Schlumberger Technology Corporation Well treatment
US9587477B2 (en) 2013-09-03 2017-03-07 Schlumberger Technology Corporation Well treatment with untethered and/or autonomous device
JP2015059376A (en) * 2013-09-20 2015-03-30 東レ株式会社 Method for collection of gaseous hydrocarbon and/or liquid hydrocarbon from underground
US9617458B2 (en) 2013-10-31 2017-04-11 Schlumberger Technology Corporation Parylene coated chemical entities for downhole treatment applications
US10557335B2 (en) 2014-01-24 2020-02-11 Schlumberger Technology Corporation Gas fracturing method and system
US9394476B2 (en) 2014-02-24 2016-07-19 Baker Hughes Incorporated Well treatment methods and fluids
US20160102246A1 (en) * 2014-10-09 2016-04-14 Fts International Services, Llc Stabilization of High Molecular Weight Polysaccharide Solutions at High Temperatures
GB2539056A (en) 2015-06-03 2016-12-07 Geomec Eng Ltd Improvements in or relating to injection wells
US10407606B2 (en) 2016-05-12 2019-09-10 Saudi Arabian Oil Company High temperature viscoelastic surfactant (VES) fluids comprising nanoparticle viscosity modifiers
US11365626B2 (en) * 2017-03-01 2022-06-21 Proptester, Inc. Fluid flow testing apparatus and methods
US10563119B2 (en) 2017-07-27 2020-02-18 Saudi Arabian Oil Company Methods for producing seawater based, high temperature viscoelastic surfactant fluids with low scaling tendency
US11746282B2 (en) 2018-06-08 2023-09-05 Sunita Hydrocolloids Inc. Friction reducers, fracturing fluid compositions and uses thereof
US11274243B2 (en) 2018-06-08 2022-03-15 Sunita Hydrocolloids Inc. Friction reducers, fracturing fluid compositions and uses thereof
CN110501266B (en) * 2019-09-27 2020-02-28 西南石油大学 Method for evaluating longitudinal deformation of proppant sand pile
CN113550714B (en) * 2020-04-26 2023-07-25 中国石油天然气股份有限公司 Hydraulic fracturing wax control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5964295A (en) * 1996-10-09 1999-10-12 Schlumberger Technology Corporation, Dowell Division Methods and compositions for testing subterranean formations
US20020004464A1 (en) * 2000-04-05 2002-01-10 Nelson Erik B. Viscosity reduction of viscoelastic surfactant based fluids
US20020169085A1 (en) * 2001-03-01 2002-11-14 Miller Matthew J. Compositions and methods to control fluid loss in surfactant-based wellbore service fluids

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3692676A (en) * 1969-12-22 1972-09-19 Continental Oil Co Method of friction loss reduction in oleaginous fluids flowing through conduits
US3637014A (en) * 1970-03-02 1972-01-25 Mobil Oil Corp Secondary oil recovery process using time-dependent shear-thinning liquid
US4321968A (en) * 1980-05-22 1982-03-30 Phillips Petroleum Company Methods of using aqueous gels
US4957165A (en) * 1988-02-16 1990-09-18 Conoco Inc. Well treatment process
US4848467A (en) * 1988-02-16 1989-07-18 Conoco Inc. Formation fracturing process
US4986355A (en) * 1989-05-18 1991-01-22 Conoco Inc. Process for the preparation of fluid loss additive and gel breaker
US5062969A (en) * 1989-05-22 1991-11-05 Halliburton Company Crosslinkable interpolymers
US5551516A (en) * 1995-02-17 1996-09-03 Dowell, A Division Of Schlumberger Technology Corporation Hydraulic fracturing process and compositions
US6435277B1 (en) * 1996-10-09 2002-08-20 Schlumberger Technology Corporation Compositions containing aqueous viscosifying surfactants and methods for applying such compositions in subterranean formations
US6258859B1 (en) * 1997-06-10 2001-07-10 Rhodia, Inc. Viscoelastic surfactant fluids and related methods of use
US5989336A (en) * 1997-07-08 1999-11-23 Atlantic Richfield Company Cement composition
US6795773B2 (en) * 2001-09-07 2004-09-21 Halliburton Energy Services, Inc. Well completion method, including integrated approach for fracture optimization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5964295A (en) * 1996-10-09 1999-10-12 Schlumberger Technology Corporation, Dowell Division Methods and compositions for testing subterranean formations
US20020004464A1 (en) * 2000-04-05 2002-01-10 Nelson Erik B. Viscosity reduction of viscoelastic surfactant based fluids
US20020169085A1 (en) * 2001-03-01 2002-11-14 Miller Matthew J. Compositions and methods to control fluid loss in surfactant-based wellbore service fluids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J. BERGENHOLTZ, N.J. WAGNER: "Formation of AOT/Brine multilamellar Vesicles", LANGMUIR, vol. 12, 1996, pages 3122 - 3126, XP002463492 *

Also Published As

Publication number Publication date
EA013900B1 (en) 2010-08-30
WO2008004172A2 (en) 2008-01-10
US7798224B2 (en) 2010-09-21
MX2008016219A (en) 2009-01-30
CA2656205A1 (en) 2008-01-10
US20080182762A1 (en) 2008-07-31
CA2656205C (en) 2013-05-14
EP2041237A2 (en) 2009-04-01
EA200970079A1 (en) 2009-06-30

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