Derrick Slides

8/12/2019 Derrick Slides

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arine & Offshore Technology

Drilling Derrick Design, Erection andDrilling Derrick Design, Erection andMaintenanceMaintenance


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Derrick " mast or a errick is the steel,open #ir er like structure thatmakes an! rillin# ri# soistincti$e. It is tall, sometimes%&& feet '(& meters) or more, anser$es as a structural tower.

It supports the crown an thetra$ellin# blocks an the wei#ht ofthe rill stem. The errick must be

tall enou#h to allow crewmembers to manipulate stan s ofrill pipe an rill collars, whichare about *& feet '%+ meters)lon#, insi e of it.


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Types of derrick tan ar Derrick

The stan ar t!pe is a boltestructure that must beassemble part b! part. It iscurrentl! use on offshoreplatforms, where the errick iskept static urin# the rillin# ofthe specifie number of wells.

Portable Derrick 'Mast)

The portable t!pe is pi$ote atits base an is lowere the

hori-ontal b! use of the rawworks after completion of thehole.This t!pe is normall! usein lan rillin# where thecomplete ri# must be mo$e to

a ifferent location aftercompletion of each well.


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CharacteristicsThe rotar! supports consist ofbeams, post an braces tosupport the rotar! table anpipe setback loa 'wei#ht ofstrin# stan in# in the errick).The substructure hei#ht abo$ethe #roun le$el $ariesaccor in# to the si-e of thesubstructure base.


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Characteristics " stan ar errick can be

esi#nate b! the followin#:

The hei#ht is the $erticalistance alon# the neutrala/is of the errick le# fromthe top of the errick floor

0oists to the bottom of thewater table beams.

The base square is theistance from heel to heel ofa 0acent le#s at the top ofthe base plate.


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Characteristics The win ow openin#

istance is measureparallel to the centreline of the errickfrom the top of thebase plate.

The water tableopenin# is anopenin# in the top of

the errick in whichthe crown block fits.


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Characteristics

The #in pole is use to hoistthe crown block to its place atthe water table openin#. The#in pole clearance, 1, ismeasure as the istancebetween the hea er of the #inpole an the top of the crownsupport beam.


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DE$I% CO $IDE'!TIO $

2n table ri$e esi#ns, si-e of mast is etermine b! : Ma/imum len#t an iameter of casin# to be set3 4en#t of tra$ellin# equipment inclu in# block, links, swi$el,

subs, an 5ell!3 4en#t of rill pipe use an racke in sin#les or oubles3 6ross sectional space is etermine b! casin# an casin#

an lin# equipment si-e3 7o$ernment i# wa! re#ulations. ome states a$e

re#ulations t at cannot be co$ere b! a permit3 4iftin# capacit! 'pullback) as a static loa capacit!.


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DE$I%& CO&$IDE'!TIO&$

T!pe of strin# han lin# willaffect the si-e as well :

uckback of kell!esi#n, whichrequires two blocks,two rums, etc3

8at hole t!pe of

connection3 Mouse hole t!pe of

connection.


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DE$I%& CO&$IDE'!TIO&$

"u/iliar! items that must be consi ere in the si-e of the mast toallow for mountin# operatin# space are :

8ackin# boar s, monke! boar s, or platforms3 6rown boar 3 Ton# counterbalances, pulle!s, or ton#s3 Mu flow lines, hoses, stan pipes3 Break o$er plumbin#3

7u!lines from crown or platforms3 win#in# booms with h! raulic winches an wire lines3


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DE$I%& CO&$IDE'!TIO&$ Internal tracks an si-e of swi$el !okes an blocks3 6at line pulle!s3 Pull own mechanisms, chain fee , c!lin er fee , or

cable fee 3 ;! raulic hoist c!lin ers in lieu of a raw works3 ;! raulic kell! or pipe spinners3 1lectrical equipment, li#hts, horn, antennas3 "irflow lines in con0unction with lar#e ( inch or < inch

flow lines for re$erse circulation rillin#3


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DE$I%& CO&$IDE'!TIO&$ 4ar#e an hea$!

casin# hammers3


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(O!D C!"!CIT)

T e contractor must calculate t e e/act r! wei# t of t e rillstrin# e plans to use from crown to ma/imum T.D. Inclu epublis e r! wei# ts of block, swi$el, kell!, an subs 'or topri$e), all rill pipe, rill collars stabili-ers, an bit. T is totalcombine wei# t s oul be +=> of t e static ookloa of t emast. Take t is total wei# t, i$i e it b! t ree t en multipl! it b!four. T e answer is t e minimum static ookloa require fort is 0ob. 9ow calculate t e total casin# strin#, inclu in# t e blockan clamps. "#ain i$i e b! t ree, t en multipl! b! four. If t is islar#er t an t e minimum static ookloa , a contractor ma!eci e as follows :


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(O!D C!"!CIT) 4ook for a mast with a

#reater hook loa . se a floatin# shoe to

float the easin# own

'not recommen eb! author). "fter rillin#, la! the

mast own an setcasin# with a crane.


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C'O* B(OC+ DE$I%&

It is e/tremel! important that all forces imposeonto this crown are balance as closel! as

possible. 2nce the $ertical an hori-ontal loa sare known for each le#, the hi#hest loa for the

front an rear are use to esi#n the two i enticalsi es of the mast.


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M!TE'I!( $E(ECTIO& O'DE''IC+

T!pical material forcompression an tension aretubular #oo s. T!pical materialfor ben in# are I beams orchannel iron.The main le#s willbe in compression an must becalculate with a columnesi#n formula.


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O $-O'E "(!T O'M

ince offshore rillin# ri#s areso e/pensi$e to install, the! areoften esi#ne for the use ofmultiple well erricks. "multiple well errick consists ofa stan ar errick that hasbeen wi ene to pro$i e spaceto rill two, four, si/, or e$enmore than twent! wells withoutthe necessit! of mo$in# theerrick.


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O $-O'E "(!T O'M

ome metho must be pro$i e to pre$ent the tra$elin# blockfrom strikin# the si e of the errick urin# rillin# un er rou#hsea con itions. 2ne means is a tra$elin# block #ui e, whichma! be either a wireline strun# from the crown to the errickfloor or a ri#i track an roller arran#ement.


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E'ECTIO&

4an ri#s break into packa#esthat are mo$e b! truck. Toreassemble the ri# on locationrequires care an precision.1ach ma0or part must beaccuratel! positione relati$eto the ri# substructure, so thatcables, walkwa!s, pipes, another equipment line up ancan be easil! connecte .

The ri# substructure isconstructe from steel beamswel e to#ether. Thesubstructure is a lar#e framethat supports the rill floor,#enerall! about A= ft to %& ft' .( m to ( m) abo$e #rounle$el, an the errick 'lesscommonl! calle the mast).


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E'ECTIO&

2nce the substructure isplace in the correct location,the errick is lai out ontocra les an assemble 'fi#. CA&). The cra les position themast so that it can be attacheto the substructure abo$e therill floor. "t the substructureen , the errick to pi$ot to theupri#ht position.


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M!I&TE&!&CE

Before repairin# an! e/istin#mast in the fiel , !ou mustcontact the ori#inalmanufacturin# en#ineerin#

epartment for proper materialan wel in# proce ures. Thesemembers will snap in half ifloa e or wel e incorrectl!.Most water well rill masts canbe wel e an repaire in thefiel , pro$i e that the propersteel is use .

Inspect the mast frequentl!.8epair imme iatel! anreplace an! bent, broken, orrippe out members. If a mast

shows a ifferent beha$iourwhile raisin#, lowerin#, orrillin#, it must be inspectefrom top to bottom.


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Derrick Slides