DRILLING FINAL EXAM QUESTIONS
AND ANSWERS
Thexpurposexofxusingxaxpre-flushxinxcementingxoperationsxisx___________________
a.xAcceleratexthexsettingxtime.
b.xRemovexsomexofxthexwallxcake.
c.xProvidexaxspacerxbetweenxthexdrillingxmudxandxthexslurry.
d.xIncreasexthexdensityxofxthexslurry.x-xans-✔✔Bx&xC
Thexbestxtemperaturexrangexforxslurryxisx_____________
a.xBelowx60oFxtoxpreventxwaterxlossxfromxevaporation.
b.xBetweenx60oFxandx90oFxasxitxgoesxintoxthexwell.
c.xBetweenx90oFxandx100oFxasxitxgoesxintoxthexwell.
d.xHigherxthanx100oFxtoxensurexproperxviscosity.x-xans-✔✔B
Benefitsxderivedxfromxusingxaxbottomxplugxinxthexcementingxoperationxincludex_______
_____
a.xWipingxmudxfilmxfromxinsidexthexcasing.
b.xReducingxslurryxcontamination.
c.xPreventingxentryxofxairxintoxslurry.
d.xAllxofxthexabovex-xans-✔✔Ax&xB
Pressurexshouldxbexbledxoffxthexcasingxbeforex______________
a.xThextopxplugxruptures.
b.xThexcementxsets,xsoxthexpipexwillxnotxbulge.
c.xThexvalvexinxthexfloatxcollarxcloses.
d.xNonexofxthexabove.x-xans-✔✔B
Whichxofxthexfollowingxsubstancesxcanxbexusedxasxdisplacementxfluid?
a.xSeawater
b.xFreshxwater
c.xDrillingxfluid
d.xAllxofxthexabovex-xans-✔✔d.xallxofxthexabove
, Inxdeterminingxthexvolumexofxanxopenxholexwithxthexdiameter-
squaredxmethod,xaxslightlyxlargerxfigurexfor
diameterxshouldxbexusedxtoxallowxforx_______________
a.xLargerxcasingxID.
b.xHolexenlargement
c.xErrorsxinxcalculation
d.xAnxextraxamountxofxcementxslurryxasxaxsafetyxfactor.x-xans-✔✔B
Anxoperatorxdesiringxtoxlowerxthexdensityxofxcementxslurryxmayxdoxsoxbyxaddingxallxofxt
hexfollowingxexcept
__________________
a.xPerlite
b.xBentonite
c.xBarite
d.xSaltx-xans-✔✔Cx&xD
Squeezexcementingxisxconsideredxaxmethodxofx____________________
a.xPrimaryxcementing
b.xPlug-backxcementing
c.xSecondaryxcementing
d.xNonexofxthexabove.x-xans-✔✔C
Listxfourxdifferentxpossiblexpurposesx(importantxreasons)xforxusingxcementxinxaxwell.x-
xans-✔✔a)xIsolationxofxcasingxshoe
b)xIsolationxofxproductionxzonesx-xpreventxcross-
flowxbetweenxintervalsxatxdifferentxpressures
c)xProtectionxofxwaterxzonesx-xpreventxdrillingxfluidxcontaminationxofxaquifers
d)xIsolationxofxproblemxintervalx-xextremexlosses,xwellxcontrol,xside-track
e)xProtectionxofxcasingx-xfromxcorrosivexformationxfluid
f)xCasingxsupportx-xsupportxforxsurfacexcasing,xforxexample.
Listxfourxtypesxofxcementxjobsx(applications)xthatxwerexdiscussedxinxclass.x-xans-
✔✔a)xCementingxcasing
b)xSettingxcementxplugs
c)xSqueezingxcementxatxcasingxshoe
d)xRepairxcasingxleaks
e)xSealxoffxperforations
f)xCombatxlossxcirculationxproblems,xetc.
Thexfailurexofxaxfloatxcollarxduringxaxcementxjobxcouldxleadxto:x
A.xFracturexthexformationxatxcasingxshoe
B.xReducexsignificantlyxthexsettingxtimexofxthexslurry
C.xHavextoxcutx(drill)xmorexcementxthanxwhatxwasxinitiallyxpredicted
D.xPrematurexsettingxofxthexcement
E.xHigherxtopxofxcementxinxthexannularx-xans-✔✔C
AND ANSWERS
Thexpurposexofxusingxaxpre-flushxinxcementingxoperationsxisx___________________
a.xAcceleratexthexsettingxtime.
b.xRemovexsomexofxthexwallxcake.
c.xProvidexaxspacerxbetweenxthexdrillingxmudxandxthexslurry.
d.xIncreasexthexdensityxofxthexslurry.x-xans-✔✔Bx&xC
Thexbestxtemperaturexrangexforxslurryxisx_____________
a.xBelowx60oFxtoxpreventxwaterxlossxfromxevaporation.
b.xBetweenx60oFxandx90oFxasxitxgoesxintoxthexwell.
c.xBetweenx90oFxandx100oFxasxitxgoesxintoxthexwell.
d.xHigherxthanx100oFxtoxensurexproperxviscosity.x-xans-✔✔B
Benefitsxderivedxfromxusingxaxbottomxplugxinxthexcementingxoperationxincludex_______
_____
a.xWipingxmudxfilmxfromxinsidexthexcasing.
b.xReducingxslurryxcontamination.
c.xPreventingxentryxofxairxintoxslurry.
d.xAllxofxthexabovex-xans-✔✔Ax&xB
Pressurexshouldxbexbledxoffxthexcasingxbeforex______________
a.xThextopxplugxruptures.
b.xThexcementxsets,xsoxthexpipexwillxnotxbulge.
c.xThexvalvexinxthexfloatxcollarxcloses.
d.xNonexofxthexabove.x-xans-✔✔B
Whichxofxthexfollowingxsubstancesxcanxbexusedxasxdisplacementxfluid?
a.xSeawater
b.xFreshxwater
c.xDrillingxfluid
d.xAllxofxthexabovex-xans-✔✔d.xallxofxthexabove
, Inxdeterminingxthexvolumexofxanxopenxholexwithxthexdiameter-
squaredxmethod,xaxslightlyxlargerxfigurexfor
diameterxshouldxbexusedxtoxallowxforx_______________
a.xLargerxcasingxID.
b.xHolexenlargement
c.xErrorsxinxcalculation
d.xAnxextraxamountxofxcementxslurryxasxaxsafetyxfactor.x-xans-✔✔B
Anxoperatorxdesiringxtoxlowerxthexdensityxofxcementxslurryxmayxdoxsoxbyxaddingxallxofxt
hexfollowingxexcept
__________________
a.xPerlite
b.xBentonite
c.xBarite
d.xSaltx-xans-✔✔Cx&xD
Squeezexcementingxisxconsideredxaxmethodxofx____________________
a.xPrimaryxcementing
b.xPlug-backxcementing
c.xSecondaryxcementing
d.xNonexofxthexabove.x-xans-✔✔C
Listxfourxdifferentxpossiblexpurposesx(importantxreasons)xforxusingxcementxinxaxwell.x-
xans-✔✔a)xIsolationxofxcasingxshoe
b)xIsolationxofxproductionxzonesx-xpreventxcross-
flowxbetweenxintervalsxatxdifferentxpressures
c)xProtectionxofxwaterxzonesx-xpreventxdrillingxfluidxcontaminationxofxaquifers
d)xIsolationxofxproblemxintervalx-xextremexlosses,xwellxcontrol,xside-track
e)xProtectionxofxcasingx-xfromxcorrosivexformationxfluid
f)xCasingxsupportx-xsupportxforxsurfacexcasing,xforxexample.
Listxfourxtypesxofxcementxjobsx(applications)xthatxwerexdiscussedxinxclass.x-xans-
✔✔a)xCementingxcasing
b)xSettingxcementxplugs
c)xSqueezingxcementxatxcasingxshoe
d)xRepairxcasingxleaks
e)xSealxoffxperforations
f)xCombatxlossxcirculationxproblems,xetc.
Thexfailurexofxaxfloatxcollarxduringxaxcementxjobxcouldxleadxto:x
A.xFracturexthexformationxatxcasingxshoe
B.xReducexsignificantlyxthexsettingxtimexofxthexslurry
C.xHavextoxcutx(drill)xmorexcementxthanxwhatxwasxinitiallyxpredicted
D.xPrematurexsettingxofxthexcement
E.xHigherxtopxofxcementxinxthexannularx-xans-✔✔C
