?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2164%2F&rft.title=Cotton+Valley+Fracture+Imaging+Project+Phase+III.&rft.creator=.%2C+.&rft.subject=Other-additional+study&rft.subject=Cotton+Valley&rft.subject=Unconventional+hydrocarbon+extraction&rft.description=This+report+contains+the+results+of+Pinnacle+Technologies%E2%80%99+fracture+engineering%2C+well+testing+anddownhole++tiltmeter++fracture++mapping++analysis++of++four++hydraulic++%E2%80%9Cwaterfrac%E2%80%9D++treatments++in++theCGU+22-9+(Cotton+Valley+formation)%2C+located+in+Carthage%2C+East+Texas.+The+main+purpose+of+thisJIP++Phase++III++(Joint++Industry+Project)+was+to+characterize+the+geometry+and+growth+of+waterfracs(gel-less+++and+++low+++proppant+++concentration+++treatments)+++in+++the+++Cotton+++Valley+++formation.Microseismic++fracture++mapping++of++fractures++in++an++offset++well++(CGU++21-10++JIP++Phase++I)++initiallyindicated+the+possibility+of+asymmetric+fracture+growth%2C+although+more+extensive+processing+laterrevealed++a++more++symmetric++shape.++For++this++reason++we++performed++downhole++tiltmeter++fracturemapping++on++the++two++upper++treatment++stages++of++the++CGU++22-9++to++determine++if++fractures++growasymmetrically++or++not.++In++order++to++accurately++measure++fracture++length++in++both++wings++and++thusaddress++the++question++of++lateral++growth++asymmetry%2C++two++tiltmeter++arrays%2C++consisting++of++ninetiltmeters++each%2C++were++deployed++in++two++offset++producer++wells++(CGU++22-4++located++1378++ft.++to++theWest++and++CGU++20-6++located++1341++ft.++to++the++East++of++the++treatment++well).++The++location++of++theseobservation+wells+(Figure+1)+are+roughly+in+line+with+the+anticipated+fracture+azimuth+of+N+70q+E%2Cpreviously++obtained++from++microseismic++imaging.++Ideal++placement++of++downhole++tiltmeter++arraysrequire+they+be+lowered+to+a+position+where+the+tiltmeter+in+the+middle+of+the+array+is+at+the+samedepth++as++the++anticipated++center++of++the++fracture++(often++taken++to++be++the++middle++of++the++perforatedinterval).++++This++position++maximizes++the++tiltmeter++response++to++fracture-induced++tilt++changes++thusincreasing++the++accuracy++in++the++measurement++of++fracture++dimensions.++Unfortunately%2C++due++topermanent++packers++at++about++8%2C300++ft++depth++in++both++observation++wells%2C++we++had++to++position++thetiltmeter++arrays++significantly++above++the++treatment++intervals++ranging++from++8%2C645%E2%80%99++to++9%2C614%E2%80%99.++Thisprohibited+mapping+of+Stages+1+and+2%2C+but+also+rendered+Stage+3+unmappable.Stress+testing+(to+determine+shale+and+limestone+stresses)+was+performed+in+four+zones+and+welltesting++in++two++zones.++The++results++of++these++tests++were++used++to++fine++tune++fracture++modeling++resultsand++compare++them++with++the++microseismic++imaging++results++in++the++CGU++21-10++and++tiltmetermapping+results+in+the+CGU+22-9.&rft.publisher=Gas+Research+Institute&rft.date=1999-07&rft.type=Reports&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2164%2F1%2F7.pdf&rft.identifier=++.%2C+.++(1999)+Cotton+Valley+Fracture+Imaging+Project+Phase+III.++Technical+Report.+Gas+Research+Institute.+++++