-
7/25/2019 Wellbore Integrity 12-9-12
1/13
ConservationCommission
DOWN-HOLE AQUIFER PROTECTION &
-
7/25/2019 Wellbore Integrity 12-9-12
2/13
Rule 207b: Bradenhead monitoring
Rule 317: Well casing and cementing; Cement bond logs,
Pressure
Controls
Rule 341: Monitor pressures during stimulation
Rule 603: Drilling and well servicing operations and high
density
area rules
Rule 608e: Bradenhead testing
2
-
7/25/2019 Wellbore Integrity 12-9-12
3/13
CURRENT COGCCPOLICIES:
.
Area,datedMay29,2012
2.
PracticesandProcedures,UICMechanicalIntegrityTests,datedMarch17,2011
3.
NoticetoOperatorsDrillingWilliamsForkFormationWellsinGarfieldCounty,SurfaceCasingDepthand
o ca ono ea o es equ remen s,rev se June23,2006
4. Noticeto
Operators
Drilling
Mesaverde
Group
or
Deeper
Wells
in
the
Mamm
Creek
Field
Area
in
Garfield
County,WellCementingProcedureandReportingRequirements,revisedFebruary9,2007
5.
NoticetoOperatorsDrillingWellsintheBuzzard,MammCreek,andRulisonFields,GarfieldCountyandMesa
County,ProceduresandSubmittalRequirementsforCompliancewithCOGCCOrderNos.1107,13956,19122,
and3692,datedJuly10,2010
6.
NoticetoAllOilandGasOperatorsActiveintheDenverBasin,ColoradoOilandGasConservationCommission
ApprovedWattenberg
Bradenhead
Testing
and
Staff
Policy,
datedDecember16,2009
7.
DrillingCompletionReportCementDocumentationPolicy,February17,2009
8.
ClarificationonProceduresforFilingChangestoApplicationsforPermittoDrill,revisedJanuary18,2011
9. ConductorPipeSettingPolicy,April6,2006
.
11.
NorthwestColoradoNotificationPolicy,EffectiveforNoticesReceivedOnorAfterJanuary1,2010,RevisionNo.
3,May10,2012
-
7/25/2019 Wellbore Integrity 12-9-12
4/13
317: GENERALDRILLINGRULES
a.Blowoutpreventionequipment(BOPE).
b.Bottomholelocation.
c.Requirementtopostpermitattherigandprovidespudnotice.
. .
e.Surface
casing
where
subsurface
conditions
are
unknown.
f.Surfacecasingwheresubsurfaceconditionsareknown.
g.Alternateaquiferprotectionbystagecementing.
h.Surfaceandintermediatecasingcementing.
i.Productioncasingcementing.
j.Production
casing
pressure
testing.
k.Protectionofaquifersandproductionstratumandsuspensionofdrilling
operationsbeforerunningproductioncasing.
l.Flaringofgasduringdrillingandnoticetolocalemergencydispatch.
m.Protectionofproductivestrataduringdeepeningoperations.
n.Requirementtoevaluatedisposalzonesforhydrocarbonpotential.
o.Requirementtologwell.
p.Remedialcementingduringrecompletion.
-
7/25/2019 Wellbore Integrity 12-9-12
5/13
COGCC
POLICIES
TO
PREVENT
GAS/OIL
MIGRATION(FORNEWWELLS)
1. ENSURESURFACE
CASING
IN
ALL
WELLS
IS
SET
AT
LEAST 50 FEET BELOW THE DEPTH OF THE DEEPEST
WATERWELLORAQUIFERS
2. ENSUREPRODUCTIONCASINGISCEMENTED
ABOVEALLPRODUCTIONZONES
-
7/25/2019 Wellbore Integrity 12-9-12
6/13
DRILLINGPROCESS
-
7/25/2019 Wellbore Integrity 12-9-12
7/13
WELL BORE DIAGRAM
DRILL OUT FOR SURFACE CASING
With fresh water to protect the aquifers
Surface Casing Hole
GROUND SURFACE
CEMENTED CONDUCTORCEMENTED CONDUCTOR
AQUIFER SAQUIFER S
SURFACE CASING HOLE
DRILLING FLUID (FRESH WATER)
HYDROCARBON FORMATIONS
Figure 1
-
7/25/2019 Wellbore Integrity 12-9-12
8/13
WELL BORE DIAGRAM
PLACE & CEMENT SURFACE CASING
To Protect Aquifers
Surface Casing
Per COGCC Rules 317.e, f, g, & h
GROUND SURFACE
CEMENTED CONDUCTOR
AQUIFER SAQUIFER S
cemented steel casing
below the aquifer
CEMENT
SURFACE CASING
HYDROCARBON FORMATIONS
Figure 2
-
7/25/2019 Wellbore Integrity 12-9-12
9/13
WELL BORE DIAGRAM
PLACE & CEMENT PRODUCTION
CASINGFluid inflow prevented by cement
WELLHEAD
Production Casing:
Hole with cemented steel
Per COGCC Rules 317.i, j, & k andverified per Rule 308A
GROUND SURFACE
CEMENTED CONDUCTOR
AQUIFER SAQUIFER S
CEMENT
SURFACE CASING
CEMENT
PRODUCTION CASING
HYDROCARBON FORMATIONS
Figure 4
-
7/25/2019 Wellbore Integrity 12-9-12
10/13
317.o. Re uirement to lo well. For all new drillin o erations,
the o erator shall berequired to run a minimum of a resistivity log
with gamma-ray or other petrophysical
log(s) approved by the Director that adequately describe the
stratigraphy of the
wellbore.A cement bond log shall be run on all
production casing or, in the case of a production
liner, the intermediate casing, when these casings r ngs are
run. These logs and all other logs run shall be submitted withthe
Well Completion or Recompletion Report and Log, Form 5. Open hole
logs shall
be run at depths that adequately verify the setting depth of
surface casing and any
.
completion intervals, or to wells in which no open hole logs are
run.
-
7/25/2019 Wellbore Integrity 12-9-12
11/13
Cement Bond Logs toverify placement ofcement
Per COGCC Rule 317.o requirescement bond logs for all wells.
Top of Cement
Figure 5
-
7/25/2019 Wellbore Integrity 12-9-12
12/13
341.BRADENHEADMONITORINGDURINGWELL
Theplacementofallstimulationfluidsshallbeconfinedtotheobjectiveformations
duringtreatmenttotheextentpracticable.
Duringstimulationoperations,bradenhead
annulus
pressure
shall
be
continuously
monitoredandrecordedonallwellsbeingstimulated.
than200psigtheoperatorshallverballynotifytheDirectorassoonaspracticable,butnolaterthantwentyfour(24)hoursfollowingtheincident.Withinfifteen(15)daysaftertheoccurrence,theoperatorshallsubmitaSundryNotice,Form4,givingalldetails,includingcorrectiveactionstaken.
Ifintermediatecasinghasbeensetonthewellbeingstimulated,thepressureintheannulusbetweentheintermediatecasingandtheproductioncasingshallalsobemonitoredandrecorded.
Theoperatorshallkeepallwellstimulationrecordsandpressurechartsonfileandavailable
forinspection
by
the
Commission
for
aperiod
of
at
least
five
(5)
years.
Under
Rule
502.b.(1),
an
operatormayseekavariancefromthesebradenheadmonitoring,recording,andreportingrequirementsunderappropriatecircumstances.
-
7/25/2019 Wellbore Integrity 12-9-12
13/13
WELL BORE DIAGRAM
STIMULATION Hydraulic Fracture
WELLHEAD
Bradenhead valve monitoring
during stimulation treatment
Per COGCC Rule 341
GROUND SURFACE
CEMENTED CONDUCTOR
AQUIFER SAQUIFER S
per Rule 341
CEMENT
SURFACE CASING
CEMENT
PRODUCTION CASING
PERFORATIONS
HYDROCARBON FORMATIONS
Figure 7
