?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F350%2F&rft.title=Filtercake+forming+mechanisms+at+fracture+and+cavity+openings&rft.creator=Griffiths%2C+I.&rft.creator=Gallimore%2C+L.&rft.subject=Energy+and+utilities&rft.subject=Materials&rft.description=Oil+wells+can+be+stimulated+to+increase+productivity+by+creating+fractures+and+cavities+in+the+sides+of+the+bore+hole+which+extend+into+the+%5Clinebreak+surrounding+rock.+These+high-permeability+channels+are+created+by+pumping+%5Cemph%7Bfracturing+fluid%7D+into+the+bore+hole+at+high+pressure%2C+which+can+crack+the+rock.%0D%0AOnce+established+most+of+the+subsequent+fluid+flows+out+of+the+fractures+as+a+result+of+their+high+permeability%2C+thus+inhibiting+further+cracking.+This+problem+is+resolved+by+injecting+a+%5Cemph%7Bdiverter+fluid%7D+containing+particles+and+fibres%2C+to+plug+the+fractures+temporarily+and+allow+another+cycle+of+fracturing+fluid+to+stimulate+a+different+region+of+the+oil+well.+Finally+the+plugs%2C+termed+%5Cemph%7Bfiltercakes%7D+are+removed+and+oil+production+in+the+well+commences.%0D%0A%0D%0AIn+this+report+we+investigate+how+the+size+and+shape+distributions%2C+concentration%2C+and+material+properties+of+particles+and+fibres+in+the+diverter+fluid+affect+the+formation+of+the+filtercakes.+We+consider+how+these+properties+may+be+engineered+to+maximize+clogging+in+fractures+and+cavities%2C+as+near+to+the+bore+hole+as+possible%2C+whilst+minimizing+the+amount+of+material+wasted.%0D%0A%0D%0AThe+problem+is+approached+by+considering+the+two+distinct+aspects+of+the+behaviour%2C+namely+the+flow+of+particulates+from+the+bore+into+the+fracture%2C+and+the+fracture+clogging.+A+series+of+mathematical+models+are+employed+that+elucidate+the+system+behaviour%2C+allowing+us+to+offer+guidance+on+the+appropriate+choice+for+the+design+parameters+to+optimize+clogging.&rft.date=2011&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F350%2F1%2FSLB-filtercake.pdf&rft.identifier=++Griffiths%2C+I.+and+Gallimore%2C+L.++(2011)+Filtercake+forming+mechanisms+at+fracture+and+cavity+openings.++%5BStudy+Group+Report%5D+++++