Mathistad#1and#2CaseHistoryEvaluatingDrainage,Fracturing,WellPerformanceandOptimumSpacingintheBakkenandThreeForks

MathistadSpacingUnit

Sec35&26,T150N,R96W

McKenzieCounty,NorthDakota

Overview

Questionsweneedanswered Whatisthedrainageorcrossflowbetweenzones/layers? Whatistheeffectivehorizontaldrainage? Doesthefracturegrowthroughanddrainbothzones? Isthewellproducingatoptimumconditions?

MethodsusedforevaluationofBkknTFSwells SummaryandConclusions

AnalysisMethods

Flowsimulation Hydraulicfracturemodeling Pressuretransientanalysis Productiondataanalysis Other??

LocationofMathistadWells

PlatofMathistadWells

Mathistad135HTFS

FPDate7408

Mathistad235HMB

CompletedJune2009

North

MB

UBsh

LBshTFSLBsh

ModelwithWells

FlowSimulation

HistorymatchedmodelusedforWhatifs Basepermof.001mdincreasedaroundwellbore Mathistad 1historymatchverticalperm.01d #2frac pressuresneeddarcy verticalpermtotheTFSformatchto#1pressures

Mathistad#1Pressuresof#2Frac

Mathistad#1ProppantConcentration

WinParse Version 2007.0.12 Generated 7/24/2009 6:21:38 PM

With pressure depletion up into the lower shale

Frac grows down into TFS

Middle Bakken interval

Lower Bakken shale

Three Forks

Mathistad1 PressureMatchNoFractureCommunication

November 08 FBHP Match Kz - .01 D

Mathistad#2BHPMatch

Calculated BHPsOtherwise gauge pressure until end

PressureTransientAnalysis

Mathistad #1AWSBuilduppost#2frac Diagnosticplots

Loglog plotshowedneedforcleanout LinearFlow

Models

DiagnosticPlot

Mathistad#2InverseRatevsSqrt(days)

Mathistad#1InverseRatevsSqrt(days)

Mathistad #2DeclineCurve

2009 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 301

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lfa.Q ( bbl/d ) 33053030110000

MATHISTAD_2-35h AREA 33053030110000

Working Forecast ParametersPhase : OilCase Name : Case1b : 2.07495Di : 0.0360542 M.n.qi : 96.0097 bbl/dti : 07/29/2010te : 07/31/2030Final Rate : 16.8664 bbl/dCum. Prod. : 11.622 Cum. Date : 07/29/2010Reserves : 413.566 Reserves Date : 07/31/2050EUR : 425.188 Forecast Ended By : TimeDB Forecast Date : 05/12/2010Reserve Type : None

MATHISTAD_2-35h AREA 33053030110000

Conclusions

Flowsimulation ValuableforWhatIfs Fracturemodelingwithpressuredepletionhelpsexplainlaterfrac communication

Historymatchpriorto#2frac shows510%ofrecoveryduetocrossflow fromover/underlyingzones

Pressurebuildupandproductionanalysisbothhaveusesindiagnosingwellboreproblems

Other

Othermethodsdependingonquestionstobeanswered

ProductionLogging DTS Microseismicmonitoring

Acknowledgements

ThankstoStateofNorthDakotaforfundingtoallowustodoalotmoredatagathering.

ThankstoContinentalResourcesMgmt forpatienceinleaving100BOPDshutinformonthsofdatagathering

Mathistad #1 and #2 Case History - Evaluating Drainage, Fracturing, Well Performance and Optimum Spacing in the Bakken and Three Forks OverviewAnalysis MethodsLocation of Mathistad WellsPlat of Mathistad WellsSlide Number 6Model with Wells Flow SimulationMathistad #1 Pressures of #2 Frac Mathistad #1 Proppant ConcentrationMathistad 1- Pressure Match No Fracture CommunicationMathistad #2 BHP MatchPressure Transient AnalysisDiagnostic PlotMathistad #2 Inverse Rate vs Sqrt (days)Mathistad #1 Inverse Rate vs Sqrt (days)Mathistad #2 Decline CurveConclusionsOther Acknowledgements