a cricital evaluation of the mechanical properties log (mpl) on a basal quartz well in the caroline...

8/7/2019 A CRICITAL EVALUATION OF THE MECHANICAL PROPERTIES LOG (MPL) ON A BASAL QUARTZ WELL IN THE CAROLINE A

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A CRICITAL EVALUATION OF THE MECHANICAL

PROPERTIES LOG (MPL) ON A BASAL QUARTZ WELL IN THE

CAROLINE AREA

J.D. MCLENNAN J. ELBEL E. MATTHEIS L. LINDSTROM

this article begins on the next page FF

PETROLEUM SOCIETY OF CIM PAPER NO. 82-33-45 THIS IS A PREPRINT - SUBJECT TO CORRECTION A CRITICAL EVALUATION OF THE MECHANICAL PROPERTIES LOG (MPL) ON A BASAL QUARTZ WELL IN THE CAROLINE AREA by J.D. McLennan J. Elbel Dowell Division of Dow Chemical U.S.A. E. Mattheis Consultant L. Lindstrom Dome Petroleum Ltd. TION RIG HTS RESER VED abstRACT INTRODUCTION There is an ever increasing need to quantify the Definition of mechanical prop erties of reservoir in situ properties of barriers and pay zones in

rocks is of major importance for simulation of order to assess the potential for fracture containment reservoir performance and for designing hydraulic tainment and to optimize stimulation treatment fracturing treatments. Ideally, identification design. A major testing program has been conducted of mechanical properties should be possible by ducted jointly by Dome Petroleum Ltd., Dowell and well logging techniques. To date, however, ade' - Schlumberger to comparelaboratory-measured quate correlation between logging predictions and mechanical properties with those determined by material properties, measured in the laboratory well logging. under simulated reservoir conditions (temperature and pressure), is not always achieved. This The testing program was confined to the Basal

paper is directed toward determining where Quartz Formation at a depth of approximately crepancies exist and outlining procedures for 3,000 m, as it occurs in a Dome well in the modifying logging measurement interpretation. Caroline area of Alberta. Laboratory testing The ultimate goal is to have an adequate body of included the determination of Young's modulus and local information, based on controlled laboratory

Poisson's ratio at in situ temperature and stress measurements and field experience, in order to conditions. allow for ready use of logging predictions, avoiding the necessity of performing expensive The MPL was derived from the open-hole sonic log and time-consuming laboratory testing on every and the in situ stresses were measured in the

well. field. An attempt has been made to explain the a basis of other known well Extensive laboratory measurements outlined subse- quently in this paper are compared to predictions


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PETROLEUM SOCIETYOF CIM PAPER NO. 823345

,

THIS IS A PREPRINT - SUBJECT TO CORRECTION

A CRITICAL EVALUATION OF THEMECHANICAL PROPERTIES lOG (MPL)ON A BASAL QUARTZ WELLIN THE CAROLINE AREA

byJ.D. McLennanJ. ElbelDowell Division of Dow Chemical U.S.A.E. MattheisConsullantL. LindslromDome Petroleum Ltd.

PUBLICATION RIGHTS RESERVEDTHIS PAPER IS TO BE PRESENTED AT THE 33RD ANNUAL TECHNICAL MEETING OF THE PETROLEUMSOCIETY OF CIM HELD JOINTLY WITH THE 6TH SYMPOSIUM ON ENGINEERING APPLICATIONS OFMECHANICS IN CALGARY JUNE 6 - 9, 1982. DISCUSSION OF THIS PAPER IS INVITED. SUCH DISCUSSIONMAY BE PRESENTED AT THE TECHNICAL MEETING AND WILL BE CONSIDERED FOR PUBLICATION IN CIMJOURNALS IF FILED IN WRITING WITH THE TECHNICAL PROGRAM CHAIRMAN PRIOR TO THECONCLUSIONOF THE MEETING.

., ,

ABSTRACTThere 1s an ever increasing need to quantify th ein s i tu propert les of barriers and pay ZOnes inorder to assess th e potential fo r fracture contalnment and to optimize stimulation treatmentdesign. A major testing program has been conducted jointly by Dome Petroleum l t d . , Dowell andSchlumberger to compare laboratory-measuredmechanical properties with those determined bywell logging.The test ing program was conf1ned to th e BasalQua rtz F orma tio n at a depth of approximately3,000 m, as I t occurs in a Dome lie 11 in th eCarollrte area of Alberta. Laboratory tes t ingi nc luded t he det ermina t' ion of Young's modul us andPoisson's rat io at in sltu temperature and stresscondi t ions .The NPL was derived from th e ope n- ho le sonlC logand th e in sHu stresses were measured in th ef ie ld . An attempt has been made to explain th ediscrepancies on th e basis of other knowil welldata .

I NTRODUCTI ONDefinit ion of mechanical propert ies of reservoirrocks is of major impor tance fo r s'imulation ofreservo l r performance and fo r designing hydraul icf ractur i ng t reatments . Idea l ly , ' ident i fi cationof mechanical propert ies should be possible bywell logging techniques. To date, halo/ever, adequate correlat ion between 10gg'ing predict ions andmaterial propert ies, measured in the laboratoryunder simulated reservoir cOilditions (temperatureand p ressu re ), is no t always achieved. Thispaper 'is d'irected toward determining where d1screpancies ex is t and out l ining procedures fo rmodifY1ng logging measurement in te rp re ta t ion .The ult'imate goal is to have an adequate body ofloc al i n fo rma tion, based on control led laboratorymeasurements and f ield experience, 1n order toallow for ready use of logging predict ions ,avoid ing the necessity of perform1ng expensiveand time-consumlng laboratory test ing on everylie 11 .Extens1ve laboratory measurements outl ined subsequent ly in this paper ar e compared to predict ions


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Schlumberger's t"1ecllanical P r u p ~ r - t i e s LogMPl). This lo g presents predictions of l i t h o l o -, shear modulus, Poisson's r a t i o , bulk modulusf rac ture gradient .

to Coates and Dena a (l980). "Lab studes show a d1st inc t t i e between l i thology typed th e shear/compressional veloci ty . Adaptingto lo g data, i t is p oss ib le by ut111zing ad synerge t ic methods of d ata p ro ce ss in g to

th e l i thology type. \'/hich with compresvelocity can be used to determlne the'1eloc1ty.

The weak 1 ink of the pro cedu re ll1ay be thquired intermediate "synthetic" log relatln{compressional wave velocity to th e shearveloci ty . logging measurement of th e shearveloci ty IS current ly a d l f f i c l J l t ilm..l uncprocedure. Consequently. a "synthet ic"allowing for an i n t e r r e l a t i o n s h i p betweencompressional \'Iave ' J e l o d t y and thE' shearveloc ity , is cu rrently a necessity_ Hot h i s correlat ion may be s e n s i t i v e to litholo(well as local condit1ons ( s t r e s s , pore prestempera ture, grada tiona l l i t h o l o g y ) .

the compressionc:Ll and shear "'Iave velocith e fo llowin g forrrulas are invoked_

o reproduce laboratory r e s u l t s with in s i t u1t is necessary to consider theof clay volume, d i s t r i b u t i o n and type,type and s a t u r a t i o n , the degree of

f i l t r a t e invas10n, and th e fracture locat iond orientdt ion \..,ithin th e rock matrix. Advancedprinciples u::.;ng computer analysisre used to s t r i p th e compressional t ravel timef i t s hydrocarbon and borehole e f f e c t s and

i t into matrix and clay responses. Thiswith th e exact l i thology type andh e lamin ate d clay model, is then used to obtainshear/compresslonal velocity anc! s u b s e q u ~ n t l ye des1red shear t r a v ~ l time."

Shear tlodulus

POIsson's RatioThe geologic environment at th e depth of comay s i m p l i s t i c a l l y be represented as i n t e r b l sandstones and shales \'lith some areas enrichcalci te_The study included extensive well loglJ1nq tphysical proper t ies t e s t i n g , geologic descrlof cored samples, poros1ty and perrlleabil i tys ur ement s, f orma ti on dalliage evaluation, SCJelectron microscope a n a l y s i s , 1n si l l l smeasurements d.nd fracture gradi en t detl'r'llIi nd

L obtain and c o r r e l a t e field and ldtory data;

Al l e:a,perimental "'lO rk \'/aS perforrned on rIlocd.ted about 150 km north of C


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a cricital evaluation of the mechanical properties log (mpl) on a basal quartz well in the caroline...

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