Hydraulic fracturing. "Fracking" (°½³».)

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Hydraulic fracturing. "Fracking"

Transcript of Hydraulic fracturing. "Fracking" (°½³».)

  • HydraulicFracturing Fracking

    ProfRichardDavies

  • 19952003oilandgasIndustry

    2003PresentAcademicinUK

    Publishedover70papersonpetroleumgeology

    20072011Lusi

    mudvolcanofromdrilling(13,000

    homeslost).Companyclaimedearthquake we

    determinedwellblowout.

    Workingonhydraulicfracturingrisks

    ProfessorRichardDaviesProfessorofEnergyDirectorDurhamEnergyInstituteDurhamUniversityUKrichard.davies@dur.ac.uk

    DurhamUniversity,ranked3rd

    inUK

  • Hydraulicfracturingoflowpermeabilityrock

    Usedtoincreasethepermeabilityof

    rocksthathavelowpermeability tight

    E.g.lowpermeabilitysandorshale

    SourceBGS

  • Stagesofdevelopment

    Stop

    Poor

    Geology SeismicData ExplorationWell

    Drillingand

    HydraulicFracturing

    Production

    Good

    Stop

    Poor

    Abandonm

    ent

    Good

    Manyyears

  • Wellcasingandcementing

    Aquifersandenvironmentprotected

    bysteelcasingandcement

    Thecasingandcementforwells

    beingfracturedarethesameas normaloilandgaswells

    Tocheckthatcementinghasbeen

    donewellacementbondlog

    is

    taken

    Maturetechnologythatneedstobe

    properlycarriedout

  • Wateruse

    volumes

    Volumeofwaterusedismodest(8,000

    23,000m3)

    Butflowback

    waterneedstobetreatedorreinjected

    Companieswillhavetodevelopplanstoresponsibly

    disposeofwastewater

    Source:SusquehannaRiver

    BasinCommission.

    e.g.Pennsylvania,USA

  • Fracking

    fluids

    99.5%Waterandsand

    0.5%chemicalstohelpthefluidgeneratefractures

  • e.g.Barnettshale(Texas) datafromHalliburton

    1000sofhydraulic fracturingoperations

    completed

    Fracturesmeasured

    Spikesonthegraphare fracturesthatgrew

    upwardsand downwards

    2700m

    reservoirs

    aquifers

  • Canfracking

    causewatercontamination?

    ~1%

    3

    5

    0

    m

    Davies,R.J.,Mathias,S.A.,Moss,J.,Hustoft,S.,andNewport,L.,inpressHydraulic

    Fractures:HowFarCanTheyGo?MarineandPetroleumGeology.

    Nofracturesgreaterthan600m

    InUSAleakduetonaturalprocesses

    andpoorcementingofcasing

    Nofracturestaller

    than600m

  • Earthquakes

    Energyduetofracking

    Energyduetofracking

    cannotbefeltatthesurface

    Oneexceptionis2.3Mevent

    inUK

    UKgovernmentintroducing

    newrulesincasethis

    happensagainwith

    operationsstoppedin0.5M

    felt

  • Readilydetected

    Changeinorientation

    Increasedmagnitude

    AfterMaxwelletal(2008)

  • Readilydetected

  • Lancashire,UK,2011

    Asaresultpotentiallynew

    legislationhydraulic

    fracturing

  • Seismicity:

    thousandsoffracking

    operationsinUSA

    1.5 2.0 2.5

    x30,000

    x1,000

    BarnettShaleUSA

    Lancashire,UK(2011)

    exceptional

    Notfeltfelt

    AfterWarpinski

    etal2012andGreenetal(2012)

  • Summary

    Hydraulicfracturingisnotanewtechnology

    Concernsonwatercontamination,inducedseismicity

    andwastewater

    Theserisksneedtobefullyresearched,quantifiedandplacedincontext withotherenergytechnologies

  • ThankYou

    Hydraulic Fracturing FrackingSlide Number 2Slide Number 3Slide Number 4Slide Number 5Slide Number 6Slide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15Thank You