MWDDD service requirements well # 8.docx
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MWDDD service requirements well # 8.docx
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MWDDDservicerequirementswell#8
TherequestfortechnicalandcommercialofferforMWD-DDservicefortheWellYK-8
RussianFederation,SakhalinIsland,SeaofOkhotsk.
Filesattachedtothedocument:
1)Attachment1.MWD-DDservicequestionnaireforYK-7andUK-8
2)Attachment2.CommercialrequirementMWD-DDwell#8
3)Attachment3.SongaVenusSubsinventory
1GeneralInformationonWell#8
1.1.Field,placeofwelldrilling
RussianFederation,Sakhalinisland,SeaofOkhotsk
1.2.Purposeofdrilling
Explorationofoil&gasreservoir
1.3.Productionhorizon
Daginskyhorizon
1.4.Thenumberoftheprojectwell
8
1.5.Welltype
Vertical
1.6.MD/TVD,m
3020
1.7.Airgap,m
1.8.Seadepth,m
26
202
1.9.Casingdesign:
Seebelowinformation
1.10SSDR
SongaVenus
2Welldesign:
Casingdesign,depthsareshownfromRT
Casingstring
Casingdesign
coefficientofcavity,
Кк
OD,mm(in)
Casingdepth,m
Topofcementbehindcasing,m
Conductor
762,0(30``)
380
228-330
228-330м-1,50
330-510м-1,30
510-1010м-1,20
1010-2160м-1,10
2160-2822м-1,38
2822-3020м-1,30
Surfacecasing
508,0(20``)
750
228-750
1-stIntermediate
339,7(133/8``)
1510
350-1510
2-ndIntermediate
244,5(95/8``)
2735
1000-2735
Productioncasing
177,8(7``)
3010
2235-3010
Note:
∙Casingsetdepthwillbecorrected/adjustedbyCustomer’sgeologistdepartmentdecisionbasedonlogsresults.
∙Ratholeforeachcasingstringtobeconsiderednomorethan10m.
Considerthepossibilitytodrillconductorsectionwithholeopener42”andrunningcasing36”inalldocumentations.
Basisofdesign:
1.1Drillinga215,9mmpilotholetoadepthofsettingsurfacecasingshoe+10mrathole(760mBRT).Thepurposesaretodetectshallowgasandtodetect10mshalelayerforsettingconductorandsurfacecasingshoes.
1.230``Conductoristoberunto330mtoisolatesurfaceunstableformations.Tobecementedtoseabed(296m)withcementslurrydensity1800kg/m³.Thesectionwillbedrilledandunderreamedwith26``bitx36``holeopener(rotarydrilling).
Considerthepossibilityofreplacingthecasing762,0mmtocasing914,4mm.Inthiscase,rotarydrilling(extension)forthedirectionwithbitsize660,4mmwithsimultaneousexpansionto1066,8mm.
1.320``Surfacecasingistoberuntoadepthof750mtoisolatesurfaceunstableformations.Tobecementedasfollows:
750-700mtailcementslurrydensity1800kg/m³,700-228mlightweightleadslurrydensity1450kg/m³.AftersubseaBOPwillbeinstalledonwellhead.Thesectionwillbedrilled660mmbit(rotarydrilling).
1.4133/8``Intermediate1casingstringistoberunto1510mforisolatingunstableformations,forpreventionstuckpipe.Tobecementedasfollows:
1510-1410mtailcementslurrydensity1,850kg/m³,1410-350mlightweightleadslurrydensity1450kg/m³.Thesectionwillbedrilledwith444,5mmbit(rotarydrilling).
1.595/8``Intermediate2casingstringistoberunto2780mtoisolateupperformationsandtoallowtodrillfurtherpayzoneintervalwithlessmudweight.Tobecementedasfollows:
2780-2630mtailcementslurrydensity1890kg/m³,2630-1000mlightweightleadslurrydensity1450kg/m³.Thesectionwillbedrilledwith311,1mmbit(rotarydrilling).
1.67``Productioncasingistoberuntofromwellhead3010mtoisolatepayzonesandprovidegoodqualitycementduringperforationandtesting.Tobecementedasfollows:
3010-2280mtailcementslurrydensity1920kg/m³.Thesectionwillbedrilledwith215,9mmbit(rotarydrilling).
Considerthepossibilityofreplacingthecasing177,8mmtoliner177,8mm.RIHIntervalfortheliner2280-3010m.
1.7DrillstringonSSDRspecifications:
a)Drillpipes
b)HWDP
c)Drillcollars
d)Subsinventoryin“Attachment3.SongaVenusSubsinventory”file.
1.8Casingspecification
Casingspecification
OD,mm(in)
Connectiontype
SteelGrade
Wallthickness
762,0
LYNXHDHT
Х-52/56
25,40-38,1
508,0
LYNXSA2
Х-52/56
15,90
339,7
TMKUPCWB
L-80
10,92
244.5
TMKUPPF
P-110(M)
10,03
177,8
TMKUPPFсоспециальноймуфтойSC80группойпрочностиP-110
R-95
10,36
Note:
Considerthepossibilityofreplacingthecasing762,0mmtocasing914,4mm.
Casingspecification
OD,mm(in)
-
Connectiontype
SteelGrade
Wallthickness,mm
914,4
-
LYNXHDHT
Х-52/56
25,40-38,1
3Typeofthedrillingmud
228-760м–seawaterwithpumpingviscousmudpackstocapacity;
750-3020м–KClPolymerdrillingfluid.
TypeandparametersofthedrillingmudspecifiedintableTypeofmud
Interval
Mudparameters
Densitykg/m3
HC-hydrocarbonaccordingtoMarsh,sec
Filtrationcharacteristics
gelstrengthdPaafter
Claycake,mm
Containsofhighgravitysolids%
рН
mineralizationСа2+,mg/l
plasticviscosity,mPa*sec
yieldpoint,dPa
ContainsofК+,mg/l
Densitybeforeweighting,kg/m3
from
top
to
bot
10sec
10min
Colloidactivepart
Sand
Total
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Seawater/slugpill(pilot)
228
760
1030/1300
100-120
-
-
-
-
-
-
-
-
-
-
-
-
-
Seawater/slugpill(conductor)
228
335
1030/1300
100-120
-
-
-
-
-
-
-
-
-
-
-
-
-
Seawater/sligpill(conductor)
330
755
1030/1300
100-120
-
-
-
-
-
-
-
-
-
-
-
-
-
KCLpolymer
750
900
1160-1180
40-55
<5
28-58
48-96
1
<6
<1
<10
8,5-9
<400
15-30
72-144
48000
1050
900
1100
1180-1200
1100
1300
1200-1230
1300
1520
1230-1250
KCLpolymer
1510
2790
1250-1280
40-55
<4
28-58
48-96
1
<5
<1
<8
8,5-9
<400
15-30
72-144
48000
1060
KCLpolymer
2780
3020
1130-1150
40-50
<4
24-48
38-72
1
<2
<1
<6
8,5-10
<400
12-20
72-120
48000
1060
1.Intervalsunderapilothole,thedirectionandtheconductorwillbedrilledontheseawaterwiththeremoval(washingout)thecuttingsontheseabed.Foreffectivecleaningofthewellboretobuild-upthedrillstringtoprovideviscouspumpingpacksofpre-hydratedbentonitedensity1300kg/m3involumeequivalentofnotlessthan40-50mbarrelintervalforapilotshaft(2.3m3),andnotlessthan15-20mbarrelforintervalsunderthedirection(19.7m3)andtheconductor(8.5m3).BeforeanySTRseawaterintothewellboremustbesubstitutedbymuddensityof1200kg/m3andwitharelativeviscosityof100-120.Fortheintervalunderthepilotholeisprovidedemergencysolutionjammingdensity1400kg/m3intheamountof3volumesofthewell,incaseofdetectionofnear-surfacegas
2.Whendrillingintervalsunderthefirstintermediate,secondintermediateandproductioncasingprovidesforpumpingviscouspacksintheequivalentofatleast50mofthebarrel,beforewipertripboreholeevery200mofpenetration,beforethedescentofWirelineloggingandOK.
3.Heavymudtoproduceuniformly,increasingthedensityof20kg/m3forthewashcyclefrom50mtothebeginningoftheintervalofvariationofdensity.
4.Intervalsspecifiedbytherotarytablewiththerathole.Intervalrotarytable-thebottomofthesea-228m.
*ProjectTDchangedaccordingtoadditiontotheprojectdocumentation–finalis3020m.
Productioncasingsettingdepth3010m.
4Geological-Technicalinformation
Lithological–Stratigraphiccharacteristicofcross-cutting
Stratigraphical
unit
Depth,m
Thickness,m
Angle
ofbedding
Description
Period
Index
Top
Bottom
1
2
3
4
5
6
7
QuaternaryPeriod
Q
228
345
94
0
Theupperpartofthecomplex(approx.2.5m)isrepresentedbygreenish-graysand,silt,looseandmediumdensity,saturatedwithwaterandgreenish-graysiltloamandclay.Sandyloamsandsandswithanadmixtureofcoarse
material,gravelandpebbles.Clay,darkgray,gray,sticky,softtomoderatelyhardened,plastic,withafewgrainsofcoarsesand.
Sandtransparentandtranslucent,colored,coarsetofine,fromsubroundedtoangular,poorlysorted,withnumerousfragmentsofconglomerates.Darkgraysiltstone.
NeogeneSystem
Pleiocen.
Pomurskyhorizon
N2pm
345
960
615
0
Miocene-pleiocen.Nutovskyhorizon
(N1-2nt)
N2nt2
960
1560
600
2
Claygray,lightgray,softtoacompacted,adhesive,plastic,sometimesblock,siltyeluted.Sandstonetransparentandtranslucent,fine-grained,hemispherical,mediumorwell-sorted,poorlycemented,friable,fragiletomoderatelyfragile,withsiliceouscement.Siltstonegray,lightgray,hardnesslooseorcrumbly,sometimeshard,brittle.Tracesofpyrite,coal,mica.Asingleseamoflimestone(approx.4m)atthebottomoftheinterval:
whiteandtranslucent,fine-grained,saccharoidal.
N1nt1
1560
2160
600
2
Claygray,lightgray,compacted,adhesive,toblockshale,silty,sometimessoft,washedaway.
Siltstonelightgray,lightbrownandbrown,moderatelyhard.Sandstonetransparent,brittle,medium-andfine-grained,poorlycemented,poorlysorted,poluokatany,poluuglovaty,sometimeswithtracesofsiliceousdifferences.Raretracesofpyrite
Miocene.Okobikaysyhorizon
N1ok
2160
2822
662
2
Brownsiltstone,lightbrowntogray,sometimesspotted,moderatelyhard,brittle,clay.
Sandstonetransparentandtranslucent,whitish,brittle,fine-grained,poorlysorted,weaklycalcareouscement;inthelowerpartofthesection-greenish,,fine-grainedquartzandglauconite,,firmlycemented.Lightgrayclay,dispersion,washedaway,softblock,siltytosandy,sometimesturningintodarkgrayclayandrust-colored,platy.
Miocene.Daginskyhorizon
N1dg
2822
3020
128
2-5
Quartzsandstone,gray,transparent,solid,strong,assorted,irregularlylayered,moderatelycemented
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