PETE 324Lecture 21Rosalind Archer21.2Analysis of Drawdown TestsInfiniteactin! radial flow in a ho"o!enous reser#oir is !o#erned $y%This is of the for"%1]1

+ s 8686 . 0 22 . 3r cktlogkhqB6 . 162 p p2w ti wf) t log( m p phr 1 wf21.3Analysis of Drawdown TestsThis i"&lies the &ressure data should for" a strai!ht line on a se"ilo! &lot.1]1

+ s 8686 . 0 22 . 3r cklog m p pkhqB6 . 162 m: where2w ti hr 121.4Analysis of Drawdown TestsAnalysis &rocedure'Plot all data(')it a strai!ht line to the data* re"e"$erin! this solution does not account for radial flow which "ay distort the early ti"e data.If the &ressure deri#ati#e is also &lotted it should $e at a constant le#el durin! infiniteactin! radial flow +",2.3-3&./'0se the slo&e of the se"ilo! strai!ht line +"/ to deter"ine &er"ea$ility +1/'0se the #alue of &+1hr/ 2read fro" the se"ilo! strai!ht line3 to deter"ine s1in +s/.21.4Analysis of Drawdown TestsIf the data de&arts fro" the se"ilo! strai!ht line in late ti"e in indicates the &resence of $oundaries%21.5Analysis of Drawdown TestsTi"e can $e related to radial distance in a well test #ia the conce&t of the radius of in#esti!ation%This can $e used to esti"ate the distance to the reser#oir $oundary $ased on the ti"e at which the &ressure data de&arts fro" the se"ilo! strai!ht line.t2invckt10 434 . 2 r 21.6Analysis of 7uildu& TestsPressure $uildu& tests in#ol#e recordin! &ressure data while a well is shut in after a &eriod of flow.21.8Analysis of 7uildu& TestsThe &ressure res&onse for a $uildu& can $e constructed $y usin! su&er&osition and the drawdown solution.'An fa1e in9ection well +located at the sa"e location as the &roduction well/ is turned on att , t&.It.s rate is :.1]1+

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+ s 8686 . 0 22 . 3r cklogt tlog ) t log(khqB6 . 162 ) 0 t ( p p2w tpp wf wst21.;Analysis of 7uildu& Tests This i"&lies a &lot of &ws #ersus +t&orner &lot/21.1-Analysis of 7uildu& TestsAnalysis &rocedure'Plot all data +& #ersus +t&orner.