SPE

SPE 15867

A Driller’s HAZOP Methodby P,J. Comer and J.S. Fitt, Techrrlca Ltd., and R. Oatebd, Technics as

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ABSTRACTdrilling operations. It has bean developedby aJoint Venturo of Teohniaa as, Consultins

A method has been developed for performing Saiantiate and Engineaw, and the Drilling and

Hazard and Operability~tudlesof drllllngsystems Hell TechnologyDepartmentof Rogslandaforskning,

and procedures. The need for such a teohniqueisThe Rogslsnd Reuesroh Inetitute based inStavanger.

explainedand its developmentand ●pplioation areThe projsot la sponsoredby Statoll,

desorlbsd. Althoughthe Drillers$ HAZOP uses the No?sk Xydro, saga Petroleum, NTNP (The Royal

asme basio mathod as the traditional‘prooesemNorwegian Counoil of Soientifio and Industrial

HAZOP,novel featureahsva bean introducedfor theResearoh),NoroamDrillingand Wilh.Wllhelmsen.

analysis of those drilling operationswhiah areessentially sequenaes ef meohsnioal and manual

This paper discussasthe developmentof the

handlingoperationsby teams of psopla. For theseD~illers@ HAZOp, as a meth~ for reviewing ~th

cases, a new type of masterdocument,the Nultiple aquipmentand operationalpromdures and presents

ActivityChart,has been developedand ratined to some examples0? its application.

be the basis for aritiml study by deviationanalysis. It has baen found that the set of guideword-variablecombinationsused in the olassloal UUAT IS NAZOP?

HAZOP study is not suitable for analysis ofMultipleActivityCharts; an elternativaset has “HAZOPN is an aoronym for ‘Hazard and

been developedand Is described. The expertenoeOperabilityStudym. It is a methodwhioh has been

gained in developmentof the new method througha used for many yeare, and uith great suacess,In

progrsmzteof ease studies,and by virtue of its the oil and Chemioalindustries,for reviewingthe

first practicalapplication,is reviewed. Thisdesign of prooess plant in order to help produoe

experiencehas demonstratedthat use of Me method safer,more effioientand more reliablaplant. It

can result in improved safety and effioienoyin is a standardstage in moat topsidedesigns.

drillingoperations. Finally,the auth~rsdisousstheir plans for the futureuse and developmentof The main featuresof the method are that it

the teahnique. is conductedby a tasm of peopleworkingtogetherunder the guidsnaeof a ahairmsn;that eaoh pertor the design or faoility is studied

IBTRODUOTION syatemstioally;●nd that to? $ech element in thedesign, all possible deviationsfrom the design

The Drillers~HAZOP is a developmentof the intentionare examinedby applicationof a set of

well established Hazard and Operability Study guide words in order to identify possible

technique for application to offshore drilling hazardoussituations. The output from the etudy

systems and operation. The method provides a is a set of questionsfor furtherinformationand

system tor oarrying out Wltical reviews of reoommendationsfor ohsngea or for further study

equipmentand proceduresin order to improvethe of speulfiedaspeots.

safetyand effioienoyof presentand future

Tablesand Figureeat end of paper,

2 A DRIIUR S‘ SAZOP METHOD C!9=15f367-r ----- .

I(USDFOR A DRILLERS$ RAZOP As in the traditionalHAZOP, the discussionis based on the identificationand assessmentc!’

The Drillers~ HAZOP project arose From a deviatioma from the deeired state of’ affairs.conviction that there is a pressing need to Potentialdeviatlonaare generatedby applyingaimprove the safety of drilling operations. This set of guide words to eaoh section of the studyis supported not only by the opinions of documant. The guide words themaalveaexperienced people but

arealso by accident discussed more fully below. The discussion is

statistics. For example,the annual reports of oonducted so as to identifythe pogeible causeathe Nornegian Petroleum Directorate give the and consequences of eaeh deviation. Nhen afollowingin~uryrates (per thousandman years)on deviationhaa a crediblecause and the design isfixed production installationson the Norwegian not considered acceptable,a racoamandatlonforcontinentalshelf,from 1979 to 1984: ohange or for further ~tudy will be made. If the

team requirefurtherinformationor guidanceaboutDrilling 106.6 companypolicy,a queetionwill be asked.Administration/production 58.2 In either case, aotion by projeotmanagementwillBuilding/Maintenance 19.4 ba required,in order to resolvetha problem.

It wae felt that a systematichazard study would The output from the study coneiatsof a setbe very likely to lead to Improvements in of the resulting reoomendatlons and questions.equipmentdesignand in operatingprocedureswhioh It is convenientto reoordthe resultsof the teamwould significantlyimprovesafety. Sesaionain tabular form to enable the origin of

any reoo~endationa to be traced. An exampleSuch aonsiderationaled to the Inltlatlonaf format for a record sheet la shown as Figure 1.

a projectto developthe conventionalHAZOP study Non-significantiteme (trivial consequences ormethod so that it aould be applied to drilling discuasiona not leading to requirements forsyetema and their operation. The resulting ●ction)are usuallynot reeorded.Drillers’ HAZOP method IS an ●daptation of theconventionalHAZOP,based on the same conaeptebut Aa with ●ll eafety etudiea,a meohanismmustincorporatingnovel featureato maka it suitable exlat for ensuringthat the teamtarecommendationfor the study of drilling ayeteme whioh may and questions ●re acted upon promptly andsometimes be very differentin nature from those ●ffectively. It la deeirablethat ●t leaat one O?‘proceea-typemones for which the originalmethod the team membershave the authorityto ensurethatuas developed. It la believed that aueh ●n euah aotion 18 in feat taken.●pproach aould be aa effeotive in identifyingsafety and operability probleme for drilling The development of the multiple activitysyatema aa it proved to be for topaideaproaeaa ohart enables the method to be readily●pplied toequipment and for achemieal-typen plants. ●lmoet all drillingoperations. A typioalaet ofHowever,it waa clear that the alaaaiaalteohnique operation and ayetema whiah may be reviewed bybaaed eaeentially on analyeia of Prooess and the DrillersHAZOPmethod are listed in Table 1.InstrumentationDiagrama (EngineeringFlowaheeta)could not be applied to moat drillingactivities The NAZOP techniquemay apply either to thewithoutmodification. This waa primarilybecause improvement of existing operations or to theof tha continualhuman interventioninvolved in developmentof better designsfor new or modifiedmost drilling operations and because of the inatallationa. In the first of thesespecialisadnature of the equipmentused in them. ciraumstanoesthe study will ba timed entirelyAt the sama time, it was reaogniaedthat the HAZOP according to the availabilityof key personnel.methodhad a capacityto analysesuoh aequenaesof However,if the study IS to form part of a projeothuman activity and that this juatifled the for the design,supply and installationof new ordevelopmentof a Drillers?HAZOP tachnique. modifiedfacilitiaathe full benefitsof the study

will not be obtainedunlessit la initiatedbeforethe key da~igndeoiaionahave been taken,so that

DRILLSRSIBAZOPMSTROD these may be Influenced by the reoomendationsfrom the study. But, at this stage many details

As In the classical HAZOP, the projeot of the deeignmay not be known and thismeans thatdocumentsare studied Ky’a taam of people with it is often dasirable to repeat the HAZOP laterexpert knowledge of the subjeot matter, in this when a finalaeeeaamentis poaaible,case drilling,under the guidanoe of a Chairmanexperiencedin HAZOP study teahniquea. The team1s usually complatad by a Seoretary reaponaible DSVELOFHENTOP A 14ULTIPLSACTIVZI’Y~RTfor producing the reaord of the team~sdeliberation. In practioe, one document la In a conventionalHAZOP study the data baseusually chosen to be the oentreof attention; in is ueuallya well definedset of design documentsthe DrillerstHAZOP this key dooumentwill usuallybe the Multiple Activity Chart (sac below)

oompriaing P & I DIS and back-up informationooveringdaaign apeoifioationa,codes of praotice

althoughP 6 I Dta will be used for aorneayaterne eto. In non-proaeeetype drilling systemethereand some aeesionawill be devoted to analysisof IS uautlly no well-defineddeeign dooument onequipmentspecification,Cauae and Effeot Charta whioh to baae the study. This la particularlyeto. true when a number o? diffarent ●ctivitiesare to

be carried out by different operatora aoting in ●

more or leae oonoertedway (the situationfor manydrillingoperation),

SPE IS1367 P.J. Comer, J.S. Fitt .9R. (htebd 3

. I-.-..T—

Beforethe study oan begin, therefore,the In the MAC table, eaoh line desoribes anteam must define a naater docunent,incorporating activity which takes place in a given period ofan agreed sequence of activities for each time. Often, individualoperatoraor groups willoperation,on which to baae the study. It has be engaged in concurrent,separatesub-aotivltiesbeen found that the MultipleActivityChart (MAC) in preparationfor a later,oombinedactivity.serves this purpose very well. MAC@s are thebaais for moat Drillers’HAZOP study seaaiona. An operator Columma (eaoh headed by theexampleMAC for a trippingout operat%onis shown correspondingcode letter): The ent~iesas Figure 2. The multiple aotivity chart ia a are in the form of Rwetioo Numberswhichmeans of documentingthe rolee of teama of people show the natureof the involvementof theworking together or in parallel to aohieve a operator concerned,

The suggeetedformat for a MACby uae of the

oommon purpose. followingcode:haa bean evolvedover a numberof oaae studiesandfound to be effloient. Some ehangee may be found 1, In oharg$o? the operationdesirable,however,to suit the ciroumstanoeaof a 2. Carryingout the work,particularoaae or to fit in with a particular under supervisionteam’smethodof working. 3* Observingor waitingto act

Blank Not involvedin this activityA set of some 15 generalisedMACS have been

producedaa part of the Driller’sHAZOP projeot, Each operatoror group is referredto byand are Inoluded in the method manual. These highest category: if the driller isinclude all the operationa oovered in the ease oarrying out an operationunder his ownatudiea (see below),and meet of those activities aontrolhe will be anteredaa ‘It but iflisted in Table 1. These ganemliaed MACS would he is being direotly supervised by thenormallybe the startingpoint for the development toolpusherwhilstdoing it, he will be inof a MAC for a apeeifio operation In a study ●a ‘2~,aeaaion. Whilst the developmentef the MAC willbe the firetmain ●ativity of the HAZOPteam, the Serrieo Co8paayColuma are filledIn inMAC will oftenoontinueto be revlaedae the study the same way aa the operator columns.progresses. They are headed by the code lettar ~S~

with ● aubaariptwhich ia the oode numberfor the servieeeempany in question.

WlSe8tadnAcPomtNotaa Cohmu Self-explanatory.

The reoommendadformatfor a MAC providesfordisplay of oertain reference informationon the Appro&ta Tim Col-: Used to give afirstat.eetof the aequenoe: rough indicationof hew long It takea to

perform the activity, aa a guide toOperatimgsequenoe: Numberand title for management for plannlng, Also, it haathe drilling operation or ayatam under been found that the diaolpline ofstudy. attemptingto aaaign a time to eac!hatop

leads to ● more preaiae definition ofUAC vemion number and date: Aa they aotivitiea.tend to be modified during the HAZOPstudy,it la adviaableto numberand dateeach version. SKLECTIOIIOF DEVIATIONSAND USE OP OUIDEWRDS

Startimgoonditiooa: The startingpoint In a olaaaioal HAZOP study a aet offor the aotlvitiesdescribed is defined deviations whioh appliea to almoat all atudieaby indicating the end-point of the oenteredupon P & I D’a ia generatedby combiningprevioussequence(ifany) or the aasumed the guide words [NO,MORE, LESS, REVERSE]with thestate of equipmentand aystema. The rig namea of the one-dimensional variablea FLOW,or platformshould be identifiedand any PRESSUREand TRMP13RATURE.In the olaaaioalstudy,aaaumptions about the uae of apeoial this baaio deviation aet ia supplemented aaequipmentshouldbe stated. required by using other variablea [LEVEL,

COMPOSITION, PHASEI and the non-speaifioguideFimal eooditione: The end-of-sequenoe word CHANGE, and alao by the uae of one-wordcounterpartof the startingconditions. deaoriptiona of deviationa [CORROSICI~I,

MAINTENANCE] for oertain inherently hazardousList of opemtom with oede lettere: oiroumataneea, It la also often found neoaaaaryEaah operator, or operating group la to introduoeepeoialvariableaor guide worda forlieted and aaaigned a oode latter by particularayatema.whioh it will be referredto in the MACTable, Many drillint aetivitiea are oonaerned

largelyor solely with manual or mechanicalhand-Liat of ae~iee emoanies with oode Ung problems to whioh the traditionalaet ofnumbers: The counterpart of the laat deviation haa littlerelevano~,so ●n ●lternativeitaa, for aervioe oompany aet haa boon developed. In this, the baaiorepresentatives. varitbleia MOVEMENT;ainoe we ●re oonoernedwith

movementin threedimensions,it ❑ust be split

A A DRILLERS~ HAZOP MZTHOD SPE 15867.

into three working variables: MOVZMENT UP,MOVEMENTDOWN and MOVEMENTACROSS. Each of theseis combined uith the classical Suide vords NO,MORE, LESS and REVERSE to generate the basio aetof deviationawhich is supplementedby othere asrequired. The guide word sets foP Driller”samdClaaaiaalUAZOP are compared in Table 2 in uhiohsome possible causes of the deviationsare alsolisted.

In conventionalHAZOP it is found that thedisouasions aan be initiated moat easily bystartingvith the NO FLOWdeviation(beoausethisla usually an extreme departure from thedesigner’s intention). When NAC’S are beingstudied in the Drillers’ HAZOP, the obviouestarting point is usually NO MOVZMZNT (UP orLXXiN),

As in conventionalHAZOP, it may not benecessaryto apply the guideword-variableroutinerigidly at every step. ?iithan experiencedteamqueetionasuoh ae What can go wrong?wmay be moreproductive. The Chairman mat judge when thedisciplineof the olaaaioalformatla requiredandwhen it may be oounter-productive.

In many oaaea there is ● ahoioe betweentreatinga particularevent as ● do~iatiom or aa aoauae (or even sometimesa 00M0OQUOMO*). In auohcaaes, the Chairmanmust be oareful to struoturethe diaouaaion so as to avoid unproductiverepetition. This has been found to beparticularlyneoessaryin DrilleralHAZOP.

Some or all of the deaoriptive phraaea usedfor deviationsin traditionalHAZOP studleemay befound useful in the Drillers’ veraion but,Rartiaularlywhen the MAC 18 the mater dooumentbeing analysed,additionalonce will be needed.

As in all HAZOP studiesa team needs not onlyan experiencedohairmanand a seoretarybut also acore of permanentmembere,with other team membersbeing availablewhen theirparticularcontributionis needed.

A typical Drillers!HAZOP team may inoludethe Operating Companyea Drilling Engineer, theContraotor~sDrillingSuperintendentand a SafetyDepartment Representative, Othere who nouldparticipatein the team as needed could inolude;Toolpusher, Driller, Subsea Engineer, ServioeCotipany Engineer (mud logging, wireline,oementing, eto.), Stability Seotion Leader andothere.

APPLICATIONOF TH2 HZTMOD

Over the courseof the projeotto developtheDrillers$HAZOP ❑ethod a number of oaae studieshave been oarried out to test and prove themethod. Caae etudiee were seleoted to oover ●

rangeof aotivitiea●nd typesof operation. A set

.

!

.

of ease studieshas been conduotedoffshoreon thearotic drillingrig Polar Pioneeron locationoffNorthernNoruay.

The oaae atudlea have studied thefollowingoperations:

1.2.3.

5.6,

7*

8.

9.

10011.12.13.

TrippingXnTrippingOutPidcingup Single8duringDrilling.Disconnectionof riser due tobad weather.Displacementof mud from riser.Liftingriser and divertertoolear wellhead during dis-connection.Emergenoydisaonneotionofriserdue to shallowgas.Disconnectionof LMRP due tobad veather.Installationof risar anddiverterassembly,Drill 171/2inoh hole.Run 20 inch oaaing.Cement 20 inoh oaaing,Installand teat eubaeaBOP.

Drilling ●xpertiee for the ease atudiea wasprovided by personnel from Wilh.WilhalmaenandNoroem Drilling aa well as staff fromRogalandaforakning. Pereonnel from the othersponsoring oompaniee●lao partiolpatedin the aaaeetudiea, and in one study provded the studyohairman and aeoretary. These individualshavehad ● aignitioantinfluenoeon the developmentofthe method, and their contributionto the projaot18 gratefullyaohnolwedged.

Oaae Study -TriPpims Out

The studyof a TrippingOut operationwaa oneof the early ctaae atudieaand is ● fairlytypicalexample. Tha studywan based on the faoilitieaatthe Rogalandaforskningfull scale teat rig inStavanger, The multiple aotivitychart for thisope?ation la shown as Figure 2, and an extraatfrom the sessionreoordsheet in Figure3.

During the study 37 reooumendationawere madeand 2h questions raiaed, The recommendationsoovereda varietyof topioa,forexample:

- Imatruwmtationamd Control(eg.drillershouldhave devicea to signalthat the elevator is closed (loekintzpinin position)or open, and that it is atthe oorreotheightwhen eonneoting),

- Prooedureoand ?reimimg.

- hObMiOd Sandlimg(es. desirability of a drawworks thatoould be driven in and out; automationofpipe-lifting from pipe rack to drillfloor).

- HanualSandlimg.

SPE 15867 P.J. Comer.J.S. Fitt & R. Ostebd 5-.—I

- Devolop9entof Prooedurea (especially forunusualor emergenoyoperation).

- Reliabilityand Maimtenacme.

- Adverse Conditions.

- Layout.

In addition to the ease studies oarriedoutaa part of tha pro~eot,one of the participatingorganiaationahave applied the method to a realprojeot,albeit in a Mmitad study (of shallowgasproblems). This first practical uee of theDrillers! HAZOP method vaa suceeasful andencouraging.

Other application of the method to realproJects are baing planned.

m FUTURE

The programmeof ease studiesundertakenforthe developmentof the Drillers’HAZOP haa beencompletedand the methodis ooneideredto be readyfor uee on live projeota. A manual haa beenprepared for the guidance of thoee wishing toapply the teahnique and there is a nuoleue ofChairman and Seoretariea●xperlenoadin ita uze.Studiesean be undertakenon a oontraotbaals anda training progrwe is being developedao thatDrillers! HAZOP aktlls may baooea more widelyavailable. The pertioipantaare oonfldent thatthis extensionof the SAZOP teohnique will ooae tobe aooepted M a valuableadditionto the ermouryof the hazardanalyatand an eseentlalpart of thesyetemetioee?ety studiee of oil explorationendproductionfaoilitiea.

BENEFITSOP TX DRILLERS’SAZOPMETSOD

The DrilleravHAZOPmethod providesa new wayto carry out a oritical review of drillingequipment and operations. Whilst the teamapproaohrequiraaa afgnifioant commitmentof

resources, it alao oonatituteaone of the mainatrengthaof the method. It Is well known that agroup of expertacan genaratemore Ldeaa than thesame people working on their own; aa one wouldexpect,this applies to problemidentificationbyHAZOPand ia of particularvalue when problemsarise at diaolplinery or organisationalboundarlea.

Tha same baaio method nay be applied toalmoat every aspeot of drilling, Thus, thaconventionalHAZOP la well suitedto reviewof themud systemand the modifiedteohniquedescribedinthis paper ia ● powerful tool for analysis ofaotual drilling or of pipe-handlingoperations,whetheron fixed or floatinginstallations.

A bonue from the applicationof the Drillers~HAZOP is that sequenoesof aotionscarriedout byteama of people ●oting in ooncert hava to beolearlyand preoiselydocumented, so that they maybe analyeed rigorously. Tha Drillers’ HAZOPpresentsauoh aequenoeain a olaar and conciseform in MultipleAativityCharts. At the end ofthe study, eaoh of theee will have been meti-CU1OUZ1Yreviewedend substantiated;this will beof benefit outside the study itself and shouldaaaiat planning and the allocation of resourees,for @xemple for the deeign of new or modifiedequipment.

The ●uthor$a gratefully acknowledge thesupport and ●aaiatanoe providedby the sponsoringoompeniea,both in terms of finanotal support andthe Invaluableoontributionafrom the personnelinvolved. Zlteprojeothas been sponsoredby NTNF,Statoil,Norsk Rydro and Saga Petroleumand by thedrilling aontraotorsWillh.Wilhelmsenand NorcemDrilling, through provision of drilling expertisefor the ease atudiea,

Runar Oatebd, one of the oo-authors,wasinvolved with the projaat prior to joiningTeohnicawhen he worked at Rogalandsforskning.

TABLE 2: lMIILLERS’IIAZOPGUIDE UORDS AND MVIATIOIIS

1. CONVENTIONALHAZOP

DEVIATIONS

Basic met :

No } ( FLOWLEss lcombined with { PRESSURENORE ) { TEMPERATUREREVERSE ) (

Supplememterymats:

( CU4POSITIONCHANOE W combined with{ PHASE

( STATE

CoftnosrokiMAINTENANCE

2. DRILLERS’ HAZOP

DEVIATIONS

Bamia -t:

m 1 ( MOVEMENTUPLEss )combined with ( UOVENENTDOWNMRE ) [ MOVEMENTACROSSREVERSE ) [

Supplementary mats

WIONO combined uith { TIME( POSITION

No 1LATE ]combined with DECISIONWRONG )

CAUSSS

Management ErrorDealEn Error

Equipment FailureControl Failure

Operator ErrorUtility Failure

FireDeviation Cauaingenother Deviation

(e.g. HDREFLOUcauaea LESS LEVEL)

CAIBES

Bad ComunioatlonsExoeaaive Streaa

More SpeedMiscalculation

Lack of DataWrong Measurement

Bad Weatherwow, Squipmant

TABLS1: ~IBLB APPLICATIONSFM THEINtILLPSk3CHAZOPMBTHOD

Aotlvlty or Systemto be studied

Pipe handlingDrillingMud ayatemeCement ayatemaCementingDrill stem testingInstallation and testingof SOPShallow gas proceduresWell killingEmergency systems andproceduresManagement systemsPlugging and abandonmentWell completionRe-entryTie-backFishingUorkoverlwirelineHeating k ventilationays t9ms

Master Doctmemta

MACUACP&IDP&IDHAG14AC+P&IDMAC

MACllAC+P&IDFIAC+P&ID

To be definedHACUACnilcMACUACMACP&ID

r-1

m

I-

PWDIEl:EAzO?Loc8==m9K 15P67

ISECTION OF PLANT:

DEVIATION CAUSES CONSEQUENCES

I

RECO_ATIONS QUESTIONS :

SA20P LOG SHSET NO. I JOB NO. I

Pxcosx2: MOLTIPSXMTZVITT - (M&)Pm-EAmLIHG XQmPMmT Is mmm ~OB8

OPERATINGSEQUENCE:TRIPPINGOUT

STARTING Comxmom:

Drilling is being stopped.

Mud is circulating.

Trip tank is full.

Heave compensatoris not used,

Top drive equipment is not used.

Lifting subs are not used.

MACDXVXLO=: PRE-PROJECT CASE STUDY

PmAL Commxolm :

Drill string stands stored ●nd lockedin set-back ●rea.

Iron roughneck retraeted in restposition.

Kellyset ●side.

Mud pumps stopped.

Standlift and upper racking arm re-tracted.

saEsT 1 0? 3

0~ IIWOL~:

*a) Companyrepresentative.b) Captain.

●c) Toolpusher.*d) Driller.*e) Assistant driller.●f) Derrick man.*s) Drill crew.

h) Stability section leader.i) Crane operator.j) Roustabouts.k) Subsea ●nsineer,1) Narine department operators,m) Standby boat captain,

SmV3CS COWAWIXSIIWOL~:

*SA)S2)S3)

*S4 )S5)S6)S7)S8)S9 )Slo)Sll)S12)S13)S14)

Mud losgints,Electric lossins,NWDlogging.Nud ●ngineer.Cemantinc.Casing.Wireline,Survey.Perforation.DST services.Diving.Wellhead manufacturer.Directional drilling.Equipmnt servicesi

SPE 15867 ●

OP~TING SEQUENCE: TRIPPING OUT SEEET 2 OF 3

‘lix- DCSCEIPTION

Stop drilling.(Continue to slowly rotatadrilling string. )

Circulate md to clean outhole. (Continue to slowlyrotate drilling string, )

Stop mud circulation,(Continue to slowly rotatedrill string. )

Review condition of well,Line up trip tank.

Lift and set aside Kelly.Ensure hook is free torotate.

Lowar elevator, extendblock ●nd ●ttach to stringLift string to releaseslips, release slips.

Lowar ●levator , changeelevator. Changa r<ta-head. Extend block ●nd●ttach to string. Prepar4new slips.

T-

Ien

z-—

1

1

-,,rt<

1-

G

—

—

—m’—

3

—

TI~—

3

2

2

2

—

&

2

3

4

5

6

7

r

2 mine

~ariable

2 min.

5 min.

15 min.

2 min.

If necessary15 min.

) Activity No. 7 only ●m] iGmt*r clI Activity No, 6 to _14 @atad ●s necessary,) Trip tank continuously monitored by driller.

WLT13U ACTWITT CaAaT 30.

OPERATINGSEQUENCE: TRIPPING otJT SEEET 3 OF 3

ii-

—

m—,8

9

10

11

1:

13

14

DESCRIPTION i-

2

3

2

3

2

2

—

q-!

2

3

2

3

3

2

i-—

—

r

1

1

1

1

1

1

—

r

3

2

2

3

2

3

—

1—

——..

ii NOTE

Review condition of wall.Start trip tank pump.

Continue to lift stand,Move stand lift to readyposition, Move upper armto ready position.

Set slips and lowr standto lock in position,

Act, 6+8 - 14ca, 3 rein, ●lltogether.

Move stand lift arm andgrip arotind pipe,’ MoveuPPer ●rm and 8rip aroundpipe. Break out connect,

op~n elevator ●nd retractblock, Start loweringblock.

Continue to lower blockand stop, Lift stand,Retract iron roushneck torest position.

Final lowering of block,Retract stand, set back,●nd lock into finger board

.

... .. ___

ruDYEF. NO.

5,1

5,2

CASESTUDY:PIPESANDLINGEQUIPMENTIN TRIPPINGOP=TIONSOPERATINGSEQUENCE:TRIPPING OUT

DEVIATION INDICATION CAUSES CONSEQUENCES ACTIONNOTES/ FOLLOWUP fQUESTIONS Comm’rsRSCOM4ENDATIONS

I I I I I5A/ 5D. Lift ●nd set aside kellv. Ensur~ hook is free to rotate.

No mvement ~

Reverse movement,

Ks1lY valve notcloeed.

?orgot to ownhook to ●nsurefree rotation.

Lifting kelly toohigh.

Failure of liftini●quipment, ●s.drill line breaksjsnaps or operatorerror.

Mud on the drill-floor.

With stabiliser ithe hole, th~drill string wirotate when pulout which maycause damase tothe hook.

Dmeged hoses,piping ●tc.Injuries tooperators.

Falling objectscausing dmegedequipnmt andinjuries tooperators.

in

1●d

A new (red-saver)valve wesdiscussed. (Apre-set pressurevalve which pre-vmtt flow forpressure below200 psi, ie. ●

md colum ●qualto tha length ofthe kelly●ssembl]

Q,7 Should senaoz●larme be providedon guid~ dolly?Q.8 Eowdowe●nsurethatkellyis not lifted toohigh?R.2 Consider aaf~location ofdriller’s cabin i!designing new ris!

,’