《海上风电场工程钻探规程》（NB-T 10106-2018）英文版

ICS27.180

P61

RecordNumber：J2648-2019

ENERGYSECTORSTANDARD

OFTHEPEOPLE’SREPUBLICOFCHINA

中华人民共和国能源行业标准

PNB/T10106-2018

SpecificationforDrillingExploration

ofOffshoreWindPowerProjects

海上风电场工程钻探规程

(征求意见稿)

IssuedonDecember25,2018ImplementedonMay1,2019

IssuedbyNationalEnergyAdministrationofthePeople’sRepublicofChina

Introduction

ThisEnglishversionisoneofChina’senergysectorstandardseriesinEnglish.Itstranslation

wasorganizedbyChinaRenewableEnergyEngineeringInstituteauthorizedbyNational

EnergyAdministrationofthePeople’sRepublicofChinaincompliancewithrelevant

proceduresandstipulations.ThisEnglishversionwasissuedbyNationalEnergy

AdministrationofthePeople’sRepublicofChinaintheAnnouncement[202x]No.xxdated

xxxx,202x.

ThisversionwastranslatedfromtheChineseStandardNB/T10106-2018,Specificationfor

DrillingExplorationofOffshoreWindPowerProjects,publishedbyChinawater&Power

Press.ThecopyrightisreservedbyNationalEnergyAdministrationofthePeople’sRepublic

ofChina.Intheeventofanydiscrepancyintheimplementation,theChineseversionshall

prevail.

Manythanksgotothestafffromrelevantstandarddevelopmentorganizationsandthosewho

haveprovidedgenerousassistanceinthetranslationandreviewprocess.

ForfurtherimprovementoftheEnglishversion,allcommentsandsuggestionsarewelcome

andshouldbeaddressedto:

ChinaRenewableEnergyEngineeringInstitute

No.2Beixiaojie,Liupukang,XichengDistrict,Beijing100120,China

Website:

Translatingorganization:

POWERCHINAHuadongEngineeringCorporationLimited

Translatingstaff:

Reviewpanelmembers:

XXXXXXXXXChinaRenewableEnergyEngineeringInstitute

NationalEnergyAdministrationofthePeople’sRepublicofChina

翻译出版说明

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译的能源行业标准英文版系列译本之一。202X年XX月XX日，国家能源局以202X年

第X号公告予以公布。

本译本是根据中国水利水电出版社出版的《海上风电场工程钻探规程》NB/T

10106-2018翻译的，著作权归国家能源局所有。在使用过程中，如出现异议，以中文版

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XXX

国家能源局

AnnouncementofNationalEnergyAdministration

ofthePeople’sRepublicofChina

[2018]No.16

AccordingtotherequirementsofDocumentGNJKJ[2009]No.52,“Noticeon

ReleasingtheEnergySectorStandardizationAdministrationRegulations(tentative)

anddetailedimplementationrulesissuedbytheNationalEnergyAdministrationof

thePeople’sRepublicofChina”,204sectorstandardssuchasCodeforEngineering

GeologicalInvestigationofPhotovoltaicPowerProjects,including32energysector

(NB)standardsand172electricpowersector(DL)standards,areissuedbyNational

EnergyAdministrationofthePeople’sRepublicofChinaafterduereviewand

approval.

Attachment:DirectoryofSectorStandards

NationalEnergyAdministrationofthePeople’sRepublicofChina

December25,2018

Attachment:

DirectoryofSectorStandards

Adopted

SerialStandardReplacedApprovalImplementation

Titleinternational

numberNo.standardNo.datedate

standardNo.

…

SpecificationforDrilling

NB/T

7ExplorationofOffshore2018-12-252019-05-01

10106-2018

WindPowerProjects

…

Foreword

AccordingtotherequirementsofDocumentGNKJ[2015]No.12issuedbyNationalEnergy

AdministrationofthePeople’sRepublicofChina,“NoticeonReleasingtheDevelopmentand

RevisionPlanoftheSecondBatchofEnergySectorStandardsin2014”,andafterextensive

investigationandresearch,summarizationofpracticalexperience,consultationofrelevantadvanced

standardsinChina,andwidesolicitationofopinions,thedraftinggrouphaspreparedthis

specification.

Themaintechnicalcontentsofthisspecificationinclude:drillingpreparation,drillingtechnologyand

methods,samplingandtesting,drillingacceptanceandqualityevaluation,andproductionsafety.

NationalEnergyAdministrationofthePeople'sRepublicofChinaisinchargeoftheadministrationof

thisspecification.ChinaRenewableEnergyEngineeringInstitutehasproposedthisspecificationand

isresponsibleforitsroutinemanagement.Sub-committeeonPlanningandDesignofWindPower

ProjectofEnergySectorStandardizationTechnicalCommitteeonWindPowerisresponsibleforthe

explanationofspecifictechnicalcontents.Commentsandsuggestionsintheimplementationofthis

specificationshouldbeaddressedto:

ChinaRenewableEnergyEngineeringInstitute

No.2Beixiaojie,Liupukang,XichengDistrict,Beijing100120,China

Chiefdevelopmentorganizations:

POWERCHINAHuadongEngineeringCorporationLimited

ZhejiangHuadongConstructionEngineeringCorporationLimited

Participatingdevelopmentorganizations:

POWERCHINAZhongnanEngineeringCorporationLimited

HUADONGEngineering(Fujian)CorporationLimited

POWERCHINAHebeiElectricPowerEngineeringCorporationLimited

POWERCHINANorthwestEngineeringCorporationLimited

Chiefdraftingstaff:

ZHANGMinglinZHOUGuanghuiSHANZhigangXUQiyun

NIUMeifengWANGJianLUFeiWANGMingyuan

YIShenzhouLIULiangpingLIYongfengLIUZhenyan

ZHONGJianpingMAOHuibin

Reviewpanelmembers:

WANGHuimingZHOUZhifangLIWengangXUJian

CHENAnzhongDOUBinMIAOXuzhangZHAOZhenqing

ZHANGWenhaiSUJingyiXUHaibinXUMo

HUANGJingboDUJinliangHUANGBincaiCHENDongqian

GUChunguangLIShisheng

1GeneralProvisions

1.0.1Thisspecificationispreparedtostandardizedrillingmethodsandtechnicalrequirementsfor

offshorewindpowerprojects,toensuredrillingqualityandsafetyofoffshoredrillingexploration.

1.0.2Thisspecificationisapplicabletothedrillingexplorationofintertidalwindpowerproject,

subtidalwindpowerprojects,andoffshorewindpowerprojects.

1.0.3Inadditiontothisspecification,drillingexplorationofoffshorewindpowerprojectshallalso

complywiththecurrentrelevantstandardsofChina.

1

2Terms

2.0.1offshorewindpowerproject

awindpowerprojectdevelopedandconstructedintheseaareaalongthecoastbelowmean

highwatersprings

2.0.2intertidalwindpowerproject

awindpowerprojectdevelopedandconstructedintheseaareaalongthecoastbetweenmean

highwaterspringsandthelowestnormallowwater

2.0.3subtidalwindpowerproject

awindpowerprojectdevelopedandconstructedintheseaareaalongthecoastbetweenmean

highwaterspringsandwavebaseor5mbelowthelowestnormallowwater

2.0.4offshorewindpowerproject

awindpowerprojectdevelopedandconstructedintheseaareawithawaterdepthof5mto

50mbelowthelowestnormallowwater

2.0.5floatingdrillingplatform

adrillingplatformfordrillingexplorationofoffshorewindpowerprojects,floatingfixedon

theseasurfacebyanchorpositioningorothermethodsduringdrillingoperation

2.0.6fixeddrillingplatform

adrillingplatformfordrillingexplorationofoffshorewindpowerprojects,fixedtoalevel

abovetheseasurfacewithpipestringduringdrillingoperation

2.0.7trussdrillingplatform

adrillingplatformfordrillingexplorationofoffshorewindpowerprojects,fixedtoalevel

abovetheseasurfacebytrusssupportduringdrillingoperation

2.0.8self-elevatingdrillingplatform

adrillingplatformfordrillingexplorationofoffshorewindpowerprojects,fixedtoalevel

abovetheseasurfacebypipestringwithitsownliftingequipmentduringdrillingoperation

2.0.9wavecompensationdevice

adeviceusedtoreducetheimpactofwaveonthefloatingdrillingplatform

2.0.10bottommaterial

materialthatmakesupthesurfacelayeroftheoceanfloor

2

3BasicRequirements

3.0.1Beforedrillingoperationofoffshorewindpowerprojects,basicdatasuchasmeteorologicaldata,

marinehydrology,topography,geology,course,pipelineandobstacledistributionintheengineering

areashallbecollected,andthetechnicalandsafetydisclosuresshallbecarriedoutaccordingtothe

requirementsofsurveyassignment.

3.0.2Beforedrillingoperationofoffshorewindpowerprojects,hazardidentificationandsafetyrisk

assessmentshallbecarriedout,thedrillingconstructionschemeandemergencyresponseplanfor

offshorewindpowerprojectshallbecompiled,andtheconstructionpermitforthewaterand

underwaterconstructionshallbehandled.

3.0.3Drillingoperationofoffshorewindpowerprojectsshallmeetthefollowingrequirements:

1Whenthewaterdepthisgreaterthan30m,aspecialdrillingplanshallbedeveloped.

2Thedrillingoperationofoffshorewindpowerprojectsshouldbecarriedoutinaperiodwith

smallwindforce.Whenthereisdensefogorthewindforceisgreaterthanlevel5,theoffshore

explorationplatformshallnotbeanchored,unmooredordisplaced.

3Forbadweathersuchasstrongwindlargerthanlevel6orwaveheightlargerthan3.0m,drilling

operationshallnotbeallowed.

3.0.4Eachroundtripofdrillingshallberecordedtimely,indetailandinorder.Thedrillingrecordform

ofoffshorewindpowerprojectsshouldcomplywithAppendixA.

3.0.5Duringthedrillingoperationofoffshorewindpowerprojects,thewastesinmanufacturingand

householdwastessuchasdrillingfluidsandoilshallbewellcollectedandtreatedproperly,andshall

notbedumpedorburnedatwill.

3

4DrillingPreparation

4.1OperationPlan

4.1.1Beforethedrillingoperationofoffshorewindpowerprojects,thedrillingoperationplanshallbe

preparedaccordingtotherequirementsofthesurveyassignmentbasedontheanalysisofthecollected

dataandfieldinvestigation.

4.1.2Thedrillingoperationplanshouldincludeprojectoverview,purposeandtask,selectionof

drillingplatform,configurationofdrillingequipmentandauxiliaryequipment,positioningofdrilling

platform,drillingtechnologyandmethod,qualitycontrol,productionorganizationand

schedulearrangement,safetyandenvironmentalprotectionmeasures,etc.

4.2SelectionofDrillingPlatforms

4.2.1Thetypeofdrillingplatformsforoffshorewindpowerprojectsshallbeselectedaccordingtothe

seaconditionsoftheoperationareaanddrillingtechnicalrequirements,andshouldcomplywiththe

requirementsoftable4.2.1.

Table4.2.1Selectionofdrillingplatformforoffshorewindpowerprojects

Typeofdrillingplatform

WaveHeight

typeforoffshorewindFlowVelocity(m/s)WaterDepth(m)SafetyDistance(m)

(m)

powerprojects

50t-100t<0.8<2.01.5-5.0Distance>1.0

between

Floating100t-300t<1.0<3.02.0-20.0waterlineand>1.0

drillingdrilling

platform300t-500t<2.010.0-30.0platform>1.2

surfaceunder

500t-1000t<3.0<4.010.0-50.0fullload>1.5

Trusstype<1.0<3.0Distance>1.0

Fixedbetweenbottom

drillingDeterminedbytheofdrilling

platformself-elevatingtype<3.0<5.0applicablewaterdepthplatformand>3.0

ofplatformsealevel

4.2.2Trussdrillingplatformshouldbeusedfordrillinginintertidalwindpowerprojects,orfloating

drillingplatformcanalsobeusedwithstrandedstate.Theself-elevatingdrillingplatformshallbe

preferredforboreholeswithin-situtestingrequirements.

4.2.3Thedrillingplatformofoffshorewindpowerprojectsshallbesetupfirmlyandarranged

reasonably,anti-collisionfacilitiesshallbesetaroundtheplatform.

4.2.4Theareaofthedrillingfieldonthedrillingplatformofoffshorewindpowerprojectsshouldnot

belessthan50m2andthewidthshallnotbelessthan5m.Thethicknessofwoodenboardforthe

platformshallnotbelessthan40mm.Thesafetyrailaroundthedrillingfieldshallnotbelessthan

1.20mhigh,andsafetyprotectionnetsshallbesetup.

4

4.2.5Thedeadweightsafetyfactorofdrillingplatformforoffshorewindpowerprojectsshallbe

greaterthan5.

4.2.6Afterthedrillingplatformofoffshorewindpowerprojectsissetup,thedrillingplatformshallbe

inspectedforacceptance,andthedrillingsafetysupervisorandthecaptainofthedrillingplatform

shallparticipatetheinspectionandacceptance.

4.3SelectionofDrillingEquipmentandAuxiliaryDevices

4.3.1Thedrillingequipmentforoffshorewindpowerprojectsshallbeselectedaccordingtothesea

conditions,boreholedepth,samplingandtestingrequirements.Whenfloatingdrillingplatformisused

fordrillingoperation,thedrillingrigwithwavecompensationfunctionshouldbeselected.

4.3.2Thewaterpumpshallbeselectedaccordingtothesiterequirementsofpumpinghead,drilling

technologyandmethods,etc.

4.3.3Thethick,externalcoupling,high-strengthandhigh-qualityseamlesssteelpipeshallbeselected

asthedrillingriser.Itsspecificationshallmatchwiththeborediameterofstarting.Thedrillingriser

withwavecompensationdeviceshouldbepreferred.

4.3.4Irontripodorquadripodcanbeusedforderrick,andtheheightofderrickshouldnotbegreater

than9m;derrickclothorsunshadeclothshallnotbeused.

4.3.5Thedrillingpipesshallbeselectedaccordingtothedrillingtechnologyandmethod,andshall

complywiththerelevantprovisionsofthecurrentnationalstandardGB/T16950,CodeofGeological

CoreDrillingTools.

4.3.6Commondoubletubeorsingletubecorebarrelmaybeusedforbedrockcoredrilling;two-stage

swiveltypecorebarrel,otherdoubletubeortripletubeswiveltypecorebarrelwithgoodperformance

shouldbeusedforcoredrillingofoverburdenorsoftandfracturedrock.

4.4AnchorPositioningofDrillingPlatform

4.4.1Forthemovementofnon-self-propelleddrillingplatform,tugboatwhichmeetsthetowing

requirementsofpower,speedandotherparametersshallbeselected.

4.4.2Thetype,quantity,ropelength,specificationandsizeofanchorsusedforanchorpositioningof

drillingplatformshallcomplywiththefollowingrequirements:

1Thetypeofanchorshallbeselectedaccordingtotheseabedsoil.

2Thenumberofwindlassesandanchorsshallnotbelessthan4sets.

3Thelengthofanchorchainshallnotbelessthan5timesofthewaterdepth.

4Thediameteroftheanchorropeshouldbe15mmto25mm;thelengthshouldbe100mto

250m;andthesafetyropeshouldbesetup.Thestrengthsafetyfactorofanchorropeshall

be5to8.

5Theanchorropeandanchorshallbereliablyconnected,andtheanchordriftshallbesetup.

4.4.3Theanchorpositioningoffloatingdrillingplatformshallmeetthefollowingrequirements:

1Anchorpositioningshouldbecarriedoutintheslacktideperiodwithvisibilitygreaterthan

5

100mandwindforcelessthanlevel5,andshouldbeundertheunifiedcommandofa

specialpersonnel.

2Theweightoftheanchorsshallbeequaltoorslightlygreaterthantheweightoftheanchors

oftheequivalentmarinevessel.

3Theanchorropeshallbemadeofcorrosion-resistantnylonropeorsteelwirerope.

4Thepositivesideofthedrillingplatformshouldbeperpendiculartothewavedirection.The

mainanchorshallbedroppedbeforetheauxiliaryanchorinanchorpositioning.Whenthe

flowrateislarge,thecrossanchoringshouldbedropped.

5Afteranchorpositioning,theanglebetweentheanchorropeandthewatersurfaceshouldbe

controlledatabout10°.Thestressoftheanchorropeshallbeuniform,andthebrakeof

thewindlassshallbereliable.

4.4.4Theanchorpositioningmethodsofself-elevatingdrillingplatformandfloatingdrillingplatform

arethesame.Whentheself-elevatingdrillingplatformrisesofftheseasurfaceandreachesthe

expectedheight,theanchorropeshallbeinarelaxedstate.

4.4.5Aftertheplacementofplatform,itshallbemeasuredandpositionedintime.Thedeviationof

boreholepositionshallcomplywiththerequirementsoftable4.4.5.

Table4.4.5Thedeviationofboreholeposition

StageofthePlanningandprefeasibilityBiddingdesignandconstruction

Feasibilitystudystage

investigationstudystagedetaileddesignstage

Deviation(m)≤10.0≤5.0≤2.0

6

5DrillingTechnologyandMethods

5.1GeneralRequirements

5.1.1Theboreholestructure,thedrillingandsamplingmethodsandtheboreholeprotectionmeasures

shallbeselectedordesignatedorselectedaccordingtotherequirementsofthedrillingassignment.

5.1.2Fortheboreholeswithsamplingrequirementsoftheseafloorsediment,thesamplingshallbe

conductedfirstbeforeinstallingthedrillingriser.

5.1.3Intheprocessofdrilling,theaxisofcrownblock,verticalshaftofdrillingequipmentandguiding

casingpipeshallbekeptonthesameaxis.

5.1.4Whentrippingofboreholeandrunninginborehole,thewaterdepthshallbemeasuredand

recordedrespectively.

5.2InstallationofDrillingRiser

5.2.1Thedrillingrisershouldbeconfiguredaccordingtothewaterdepth,tidalrangeandwaveheight.

Whenthedrillingriserequippedwithwavecompensationdeviceisused,itslengthshallcomplywith

therequirementsofmaximaltidalrangeandwaveheight.

5.2.2Accordingtothewaterdepth,flowrate,flowdirectionandotherconditions,thedrillingriser

shallbeinstalledwithsafetyhaulingropesofdifferentanglesanddirections.Reversethreadcoupling

orflangeshouldbeselectedasthecasingjoint.

5.2.3Thedrillingrisershouldbepenetratedbythestaticpressureorhammeringmethod,andshouldbe

insertedintotherelativelydenseorhardstratum.

5.3DrillingTechnologicalParameters

5.3.1Theselectionofdrillingtechniqueandparametersshallconsidertherockdrillability,andthe

drillabilityclassificationofrockshallcomplywiththerequirementsofAppendixBofthis

specification.

5.3.2Thepowerheadandself-weightofdrillingtoolshouldbeusedfordrillingwhenthedrillingrig

withwavecompensationfunctionisused,andtheself-weightofdrillingtoolorcounterweightofdrill

collarshouldbeusedfordrillingwhenthedrillingrigwithoutwavecompensationfunctionisusedon

floatingdrillingplatform.Whentungsten-carbidedrillingisadopted,thebitpressureshallbeselected

accordingtothelithology,boreholediameterandbitstructure.Thebitpressureoftungsten-carbide

drillingshallcomplywiththerequirementsoftable5.3.2-1.Whendiamonddrillingisadopted,thebit

pressureshallbeselectedaccordingtolithology,bitliparea,diamondparticlesize,grade,

concentration,etc.Thebitpressureofdiamonddrillingshouldcomplywiththerequirementsoftable

5.3.2-2.

7

Table5.3.2-1Thebitpressureoftungsten-carbidedrilling

Bitpressure(kNperblock)

Rockdrillability

OrdinaryAlloyNeedlealloy

Level1-Level40.3-0.61.5-2.0

Level5-Level7,Level8(partial)0.5-1.01.5-2.5

Table5.3.2-2Thebitpressureofdiamonddrilling

BitSize(mm)607696

Bitpressureof

4-7.56-108-11

Surface-setdiamondbit(kN)

Bitpressureof

4.5-8.56-118-15

impregnateddiamondbit(kN)

5.3.3Rotarydrillingspeedshallbeselectedaccordingtodrillingtooltype,boreholediameter,stratum,

etc.,andtherotarydrillingspeedshouldbecontrolledat65r/minto200r/mininsoillayer,and300

r/minto600r/mininrockstratum.

5.3.4Thedrillingfluidflowofrotarydrillingshallbeselectedaccordingtothepropertyofdrillingfluid,

boreholediameter,stratum,etc.Thedrillingfluidflowinsoillayershallbecontrolledat30L/minto

80L/min,and50L/minto80L/mininrockstratum.

5.4DrillingFluid

5.4.1Thedrillingfluidshallbepreparedaccordingtothestratumtypesintheseaarea,andthedrilling

fluidwithlowsolidphaseorsolidfreeshouldbeselected.Themainperformanceindexesoflowsolid

phasedrillingfluidshouldcomplywiththerequirementsoftable5.4.1-1.Themainperformance

indexesofsolidfreedrillingfluidshouldcomplywiththerequirementsoftable5.4.1-2.

Table5.4.1-1Mainperformanceindexesoflowsolidphasefluid

Clayorsilt

PerformanceindexesGravel

GeneralstratumStratumeasilycollapses

Funnelviscosity(s)18-2023-30>40

Specificgravity1.10-1.151.05-1.151.05-1.08

Waterloose(mL/30min)<25<15<15

Staticshearforce(10-5N/cm2)10-2525-5030-50

Sandcontent(%)<5.0<0.5<1.0

8

Dynamicplasticratio(τ0/η0)>3

pHvalue8-11

Table5.4.1-2Mainperformanceindexesofsolidfreefluid

Clayorsilt

PerformanceindexGravel

GeneralstratumStratumeasilycollapses

Funnelviscosity(s)20-5030-60>120

Specificgravity1.03-1.05

Waterloose(mL/30min)<12<16<16

Plasticviscosity(mPa·s)10-2510-3510-25

Sandcontent(%)<5.0<0.5<1.0

Dynamicshearforce(mPa)10-2010-2010-25

Dynamicplasticratio(τ0/η0)>2

pHvalue8-11

5.4.2Theperformanceindexesofdrillingfluidcanbeadjustedbydifferentkindsofinorganicagent,

andtheselectionofcommonlyusedfluidinorganicagentshouldcomplywiththerequirementsof

table5.4.2.Theinorganicagentshouldbedissolvedorhydrolyzedbeforemixing.

Table5.4.2Selectionofcommonlyusedfluidinorganicagent

CategoryInorganicagent

FlocculantCement,lime,gypsum,calciumchloride,salt,waterglass,hydrolysisdegree30%polyacrylamide

TackifierHydroxycellulose,hydroxyethylcellulose,biopolymer

WaterlossreducerHydroxycellulose,hydrolyzedpolyacrylamide,vegetablegum,humicacidsalt

pHcontrolagentCausticsoda,sodaash

WeightingmaterialBaritepowder,calcitepowder,magnetitepowderandgalenapowder

5.4.3Sodiumbentoniteshouldbeselectedtopreparelowsolidphasefluid.Whencalciumbentoniteis

used,sodiumtreatmentshallbecarriedoutfirst.

5.4.4Thepreparationofsolidfreevegetablegluefluidshallcomplywiththefollowingrequirements:

1Thedosageofvegetableglueandinorganicagentshallbedeterminedaccordingtothe

characteristicsofsoils.

2Whenthemixerisusedforpulping,therotatespeedshouldnotbelessthan600r/min.

3Themixeddrillingliquidshallbefullysoaked.

4Anti-corrosionmeasuresshouldbetakenwhenthetemperatureishigh.

5.4.5Thecirculatingsystemofdrillingfluidshouldbeequippedwithcirculatingchannel,

sedimentationpond,returnpondandstoragepond.

5.4.6Intheprocessofdrilling,theperformanceindexesoffluidshallbeadjustedintimeaccordingto

9

thechangeofboreholedepth,stratum,etc.

5.5PreventionandTreatmentofAccidentsinBorehole

5.5.1Thetightnessofanchorropesoffloatingdrillingplatformshallbeobservedandadjustedintime.

5.5.2Inthedrillingprocess,thecasingandotherauxiliarytoolswithcracks,wornorrustedthreaded

coupling,bendingdeformation,etc.mustnotbeused.

5.5.3Anti-corrosionmeasuresshallbetakenforsparecasingandsalvagetools.

5.5.4Afteranaccidentoccursintheborehole,thetypeoftheaccidentshallbedetermined,thecause

anddepthoftheaccidentshallbefoundout,andthehandlingdepthoftheaccidentshallbecheckedin

realtimeaccordingtothechangeofwaterdepth.

5.5.5Theaccidentsinboreholeshouldbehandledbypulling,jacking,beating,reversing,expanding,

coningandothermethods,andthedrillrodshallbetightenedintimeduringthetreatment.

5.5.6Incaseofusinginterlocksorscrewtapforsalvagingtreatmentofdroppingorbreaking,thespiral

centeringsalvagehookshouldbeequipped.

5.5.7Whenhandingtheaccidentsofdrillrodburyinganddrillrodsticking,removingbyforcewith

theuseofajackmustnotbepermitted.

5.5.8Whenthereareresiduesintheboreholeortheboreholewallisunstableaftertheaccident

treatmentintheborehole,measuressuchascleaningandwallprotectionshould