Practice the Kill Sheets.docx

Practice the Kill Sheets: An ot h ere as ywa yt opa dy o urg r a deont h eI WCFL ev e l 3an dL ev e l4e x am i st oma ma s t e r fi l l i ngoutIWCF Kill Sheets. l l s heet smays eem i nt i mi dat i ngatfi r s tbutt hey ’ r e Sheets .Ki ac t ual l yqui t eeas yt ol ear nus i ngt heI WCFpr ef or mat t edk i l l s heet st haty ou’ r eal l owed t ous edur i ngt het es t .I ’ v ei nc l udedas ampl eI WCFKi l l SheetEx er c i s ebel owt os how y ouhowt ofi l l outat y pi c al Ki l l Sheets i mi l art owhaty ou’ l l fi ndonanI WCFLev el 2, L ev e l 3orL ev e l4e x a m. m.Yo uc a ndo wn l o adabl a nkI WCFKi l l Sh ee tf r o mt h eI WCF webs i t ehere  t ofi l l outandf ol l owal ongov ert henex ts ec t i onoft hi sst udygui de. Example Kill Sheet Problems with Explanations: Hol eSi z e:81/ 2i nc h Hol eDept h:10450( TVD/ MD) Ca s i n gSh oe :9 5 / 8i n c h7 80 0f e et( TVD/ MD) Internal Capacities: Dr i l l Pi pe:5i nc h0. 0172bbl / f t Heav yWei ghtDr i l l Pi pe:5i nc h,l engt h723f eet ,c apac i t y0. 0088bbl / f t Dr i l l Col l ar s :61/ 2x213/ 16i nc h,l engt h912f eet ,c apac i t y0. 0077bbl / f t Chok eLi ne:21/ 2i nc hI D,l engt h415f eet ,c apac i t y0. 0061bbl / f t Mar i neRi s erLengt h:400f eet ,c apac i t y0. 3892bbl / f t Annulus Capacities Between: Dr i l l Col l ar si nOpenHol e:0. 0292bbl / f t Dr i l l pi pe/ HWDPi nOpenHol e:0. 0447bb l / f t Dr i l l pi pe/ HWDPi nCas i ng:0. 0478bbl / f t Dr i l l Pi pei nRi s er :0. 3638bbl / f t Mud Pump Data: Di s pl ac ementat98 %v ol ume t r i ceffic i enc y0. 12bbl / s t r ok e Slow pump rate data: @45SPM t hr ought her i ser780psi @45SPM t hr ought hechokel i ne900psi Other releant in!ormation: Ac t i v es ur f ac ev ol ume4 80bbl s Dr i l l pi pec l os edenddi s pl ac ement0. 0254bbl / f t "ormation stren#th test data: Su r f a c el e ak o ffp r e s s ur ewi t h11pp gmu d1 90 0p s i Kic$ Data: Thewel l k i c kedat10450f tv er t i c al dept h Shuti ndr i l l pi pepr es sur e550ps i Sh uti nc as i n gp r es s ur e8 20p s i

Pi tgai n10bbl Mu dDe ns i t y1 1 . 5pp g

Completed IWCF Subsea Kill Sheet with Detailed Explanations: %he !ollowin# I&C" $ill sheet has been completed with the aboe data: %itle Bar:

Reme memb mbert oputyourname meanddat eonyoursheet !

"ormation Stren#th Data:

Fort hi ss ec t i on,y ouneedt ofi l l i nt hebl oc k sus i ngt hedat af r om t heex ampl ek i l l s heet dat apagesabo v e.For( A)y o uus et hes ur f ac el e ak offpr es s ur ef r om t he“ For mat i on St r engt hT es tDat a”s ec t i on.For( B)y o uus et hemudwei g htus eddur i ngt hes ur f ac e

l eak offpr es sur et es tf r om t hes ames ec t i on.( C)i sc al c ul at edbypl uggi ng( A)and( B) i nt ot hef or mul agi v ent oy oui nt hebox . I fy oudoy ourc al c ul at i onscor r ec t l y ,y ou’ l l c omeupwi t h15. 6844ppg.Si nc e Caution:  mudwei ght sar egener al l yr ec or dedt oonedec i mal pl ac e( t ent hs )y ou’ l l needt or ound 1 5. 6 84 4pp g.Ho we v e r ,y o uCAN’ Tr o un du pb ec a u s ey o uwi l l e x c e edt h ema x i mu m a l l o wa bl emu dwe i g hti fy o ur o undupt o1 5. 7 .Yo umu s tr o un dd ownt o1 5. 6p pgt o r ec or dt hepr opermax i mum al l o wabl emu mu dwei ghtont heki l l s hee t . Mud Pump Data and Slow Pump 'ate Pressures:

Themudpumppr es sur es ec t i onoft hek i l l s heeti sfi l l edoutal mos tent i r el yf r om i nf or mat i onf r om t hedat as heety ou’ r egi v enatt hes t ar toft het es t .Thedi s pl ac ement pers t r ok eoft hepumpi sgi v ent oy o uaswel l ast hes l o w pumpr at edat at hr ou ght he r i s erandt hec hok el i ne.Theonl yt hi ngy ou’ l l needt oc al c ul at ei nt hi ssec t i oni st he c hok el i nef r i c t i onl os swhi c hi ssi mpl yt hedi ff er enc ebet weent hes l owpumpr at ei nt he Ch ok eLi ne( 900)andt hes l o w pumpr at ei nt her i s er( 780)=12 0.

Current &ell Data:

Thei nf or mat i onf ort hi ssec t i oni sal s opul l edf r om t heex ampl ek i l l s heetpr obl em dat a. Mar i neRi s erandChok el i nel engt har egi v ent oy ouont hedat as heeti nt he“ I nt er nal

Capac i t i es ”s ec t i on.Dr i l l i ngmudwei ghti sgi v ent oy oui nt he“ Ki c kDat a”s ec t i on. Cas i ngs i z eandme meas ur eddept h( MD)a ndt o t al v e r t i c al d ept h( TVD)ar egi v ent oy ouat t hev e r yt opoft hek i l l s hee tpr obl em aswel l ast heHol eSi z eandHol eDep t hi nMDa nd TVD. me me mb mb ert h ed i ff er e nc ebe t we enTo t a lVe r t i c a lDe pt h( TVD)a ndMe Me as u r e d Caution:Re De pt h( MD) .Me as ur e dd ep t hi su s edwh enc al c u l a t i n gv o l u me meso ffl u i ds .TVDi su s ed wh enc a l c u l a t i n gh y dr o s t a t i cpr e s s ur e s .Fo re x ampl e ,y o uwo ul du s eMDwh en c al c ul at i ngt hev ol umeoffl ui di nt hedr i l l pi pebuty ouwoul dus eTVDwhenc al c ul at i ng t hehy dr os t at i cpr es s ur eoft hefl ui di nt hedr i l l pi pe. Drill Strin# (olume:

Cal c ul at i ngt hedr i l l s t r i ngv ol umei sass i mpl easpl uggi ngt hel engt hofy ourdr i l l pi pe, heav ywei ghtdr i l l pi pe( hev iwal l orHWDP)anddr i l l c ol l ari nt ot hedr i l l s t r i ngv ol ume s ec t i on.Thec apac i t i esf oral l t hr eear egi v ent oy oui nt hepr obl em i nt he“ I nt er nal Capac i t i es ”s ec t i on.Theonl yt r i c kyt hi ngi sfi gur i ngoutt hedr i l l pi pel engt h.Si nc et he l engt hofHeav yWei ghtDr i l l Pi peandDr i l l Col l ar sar egi v ent oy ou,al l y ouneedt odoi s s ubt r ac tt hes et wov al uesf r om t het ot al MDoft hewel l t ofi ndt hedr i l l pi pel engt h.I nour e x a mp mp l epr o bl e mt h i swo ul dbe10 , 4 5 0–72 3–91 2=8 81 5. Onc ey ou’ v epl uggedi nt hel engt hofeac hs ec t i onofdr i l l s t r i ngandt hec apac i t i esyou s i mpl ymu mul t i pl yeac hr o wt ofi ndt hebar r el sofmudi neac hs ec t i onandaddt hem upt o fi ndt het ot al dr i l l s t r i ngv ol ume.Af t ery oufi ndt het ot al dr i l l s t r i ngv ol ume( 165bbl si nour e xampl e)y oudi v i det hebbl sbyt hepumpdi s pl ac ementpers t r ok e( . 12bbl si nour e x a mp mp l e )t ofi gu r eou th owma nys t r o k eso ft h emu dp umpar ene ed edt oc omp l e t e l y di s pl ac et hedr i l l s t r i ng( 165/ . 12=1375) .Onc ey ou’ v ec al c ul at edt hepumps t r ok es neededt odi s pl ac et her i s er ,y oudi v i det het ot al s t r ok esbyt hes t r ok espermi nut e ( SPM)o ft h emu dp umpt ofi ndou th owmu c ht i mewo ul db en ee de dt ot o t a l l yd i s p l a c e t hev o l u me meo ft h edr i l l s t r i ng .Si n ceourmu dp umpi spu mp mpi n ga t4 5SPM wege t 1 37 5/ 4 5s pm =30 . 5mi mi n ut e s .

Open )ole and %otal Annulus*Cho$eline (olume:

Thi ssec t i oni sfil l edoutv er ysi mi l art ot hes ec t i onabov eex ceptnowy ou’ r ec al c ul at i ng t hev ol umeofmudi nt heopenhol eandcas i ngmi mi nust hespac et ak e nupbyt hedr i l l pi pe,HWDPa ndDr i l l Co l l ar s . You’ r egi v ent hel engt hoft hedr i l l c ol l ar si nt hedat as heetf ort hepr obl em.Tofi ndt he l e ng t ho fDPa ndHWDPi nt h eu nc a s eds e ct i o no ft h ewe l l ( t heo pe nh ol es e c t i o n)y o u n ee dt ofi r s tfi n do uth owmu c ho pe nh ol ey o uha v e.Yo ud ot hi sb ys u bt r a ct i n gt h es h oe TVDf r om t h eTVDo ft h een t i r ewe l l ( 1 045 07 80 0=2 65 0f ee to fo pe nh ol e ) .Si n c e9 12 f eetoft hi sopenhol ei sfi l l edwi t hdr i l l c ol l ar ,t her es t( 2650’ –912’ =1738’ )i st hel engt h ofdr i l l pi pe/ HWDPi nt hehol e.

%otal &ell S+stem S+ste m (olume:

Thet ot al wel l s y s t em v ol umei sc al c ul at edbyaddi ngv al ues( D)and( I )f r om abov e wh i c hgi v e sy o u624. 8bbl s .Di v i det hi sbyy ourpumpd i s pl ac ementpers t ok e( . 12 bbl s / s t r ok e)t oc al c ul at et het ot al s t r ok est hi sr epr es ent s( 5207s t r ok es ) .Fr om her e di v i det hi sbyt heSPM y ou’ r eus i ng( 45SPM)andt hi swi l l t el l y ouhowl ongi twi l l t ak et o d i s p l ac et h eT ot a lWe l l Sy s t e m Vo l u me mewi t ht h emu dpu mp mp( 1 15 . 7m mi i n ut es ) . Theac t i v es ur f ac ev ol umei sgi v ent oy oui nt hedat as heets oy our ec or di ti nt hi s s ec t i onandt hendi v i dei tbyt hepumpdi s pl ac ement( . 12bbl s / s t r ok e)t ofi ndouthow man ys t r ok esi twoul dt ak et odi s pl ac et heac t i v es ur f ac ev ol ume. T ot al ac t i v efl ui ds y s t em v ol umei sc al c ul at edb ya dd i ngt hepr e vi oust wov ol umesand s t r ok est oget her . Mar i ner i s erl engt hi sgi v ent oy ouont hedat as heeti nt he“ I nt er nal Capac i t i es ”s ec t i on aswel l ast heannul usc apac i t ywi t hdr i l l pi pei nt her i s eri nt he“ Annul usCapac i t i es Be t ween”s ec t i o n.

Mak Ma es ur ey ouus et heRi s erc apac i t ywi t hdr i l l pi pei nt her i s erv s.t her i s er Caution:  c apac i t yt hati sl i s t edi nt he“ I nt er nal Capac i t i es ”s ec t i onwhi c hdoesnotac c ountf orl os t c apac i t yduet ot hedr i l l pi pebei ngi nt her i s er . Kic$ Data Section:

Thek i c kdat as ec t i oni sfi l l edwi t hi nf or mat i ondi r ec t l yofft hek i l l s heetdat apagei nt he “ Ki c kDat a”s ec t i on.

Kill Mud &ei#ht:

Ki l l mudwei ghti sc al c ul at edbypl uggi ngt henumber si nt ot hef or mul apr ov i dedi nt he s ec t i on.You’ r eal r eadygi v enShut i nDr i l l Pi pePr es sur e( SI DPP) ,t heTVDoft hewel l andt hec ur r entmudwei ght .Al l y o uneedt od oi spl ugt henumber si nandc al c ul at et he mudwei ghtneededt ok i l l t hewel l .I fy ou’ v er unt henumber scor r ec t l yy ous houl dgeta c al c ul at edk i l l wei ghtmudof12. 5121ppg.Ki l l mudi sus ual l yr ec or dedt oonedec i mal pl ac es oi twoul db enat ur al t owantt or oundt hi sv al uedo wnt o12. 5ppg.Ho we v ery o u al wa y sr oundupk i l l mudwei ghtt ot hen ear es tt ent hso12. 5121woul dber oundedt o 12. 6ppg.Ther eas onbei ngi fy ouma madei t12. 5ppg,t her ewou l dn ’ tb ee nou gh hy dr os t at i cpr es s ur ec r eat edi nt hewel l t o“ k i l l ”t hewel l . me me mb mb ery o ua l wa y sr o un du pKi l l Mu dWe i g htt ot h en ea r e s tt e nt ha nd Caution:Re y o ual wa y sr o un dd owny o urMa x i mu m Al l o wa bl eMu Mu dWe i g htt ot h en ea r e s tt e nt h . I ni t i al Ci r c ul at i ngPr es s ur e: Youc al c ul at ei ni t i al c i r c ul at i ngpr es sur e( I CP)bysi mpl yaddi ngt heDy nami cPr es sur e Los st hr ought her i s er( 780i nourex ampl e)t ot heShutI nDr i l l Pi pePr es sur e( 550) gi v enus1330PSIi noure x ampl e.Thi si st hepr es s ur ey oue xpec tt os eeont hedr i l l pi pepr es sur egaugewhenfi r s ts t ar t i ngt oc i r c ul at eoutt hek i c k.

"inal Circulatin# Pressure:

Youc al c ul at et hefi nal c i r c ul at i ngpr es sur ebydi v i di ngy ournewk i l l mudwei ghtbyt he c ur r entmudwei ghtandt henmul t i pl yt hi sv al ueb yt hesamedy nami cpr es s ur el o ssy ou us edabov e.Thi si st hepr es s ur ey oue xpec tt os eeont hedr i l l pi pegaugeonc eal l of t hek i l l mudi spumpeddownt hedr i l l s t r i ngandi ss t ar t i ngt oent ert heannul us .

PSI Drop Per ,-- Stro$es:

Thi ss ec t i oni swher ey o uc al c ul at et hepr es s ur edr o ppere v er y100s t r ok e soft hemud pumpasy ous t ar tp umpi nghea v i erk i l l wei ghtmuddo wnt heho l e.Al l y o udoi sfi ndt he d i ff er en c eb et we ent heI CPa ndFCPt ha ty o uc al c u l a t e da bo v ea ndt h enp l u gt h at numberi nt ot hene xtf or mul awher ey oumul t i pl yi tby100anddi v i dei tbyt he( E)whi c h i st henumberofs t r ok esneededt odi s pl ac et hedr i l l s t i ng. Wh eny ous t ar tp ump i n gk i l l we i g htmu dd ownt h eho l ey oune edt obeato ra bo v et h e I CPt oens ur ey oudon’ tl etmor ef or mat i onfl ui dsi nt ot hehol e.Ast hedr i l l s t r i ngi s di s pl ac edwi t ht hehea vi erwei ghtmud( andt her ef or ec r eat i ngmor eh ydr os t at i c pr es sur e)y ou’ l l needt oadj us tt hedr i l l pi pepr es sur edownus i ngt hec hok et ok eept he bot t om hol epr es s ur econs t ant .I not herwor ds ,f orev er y100st r ok esy oupumpwi t h y o urmudpumpst hedr i l l pi pepr es s ur es hou l ddr op34. 5ps i( bas edonoure x ampl ek i l l s h e e t ) .

Pressure per Stro$e %able:

Onc ey ou ’ v ecal c ul at edy o urI CP ,FCPandpr es s ur edr opper100s t r ok es ,y o uc anfi l l outt hes t r ok es / pr es sur et abl e( s t epdownc har t )t ot her i ght .I nt hel ef thandc ol umn s t ar tat0andi nc r eas ei n100s t r ok ei nc r ement sunt i l y ougett ot het ot al numberof s t r ok esneededt odi s pl ac et hedr i l l s t r i ng( 1375i nourex ampl e) .Ont her i ghthands i de s t ar twi t hy ourI CPanddec r eas et hepr es sur eby34. 5ps i( c al c ul at edi nt hepr ev i ous s ec t i on)f orev er y100s t r ok esunt i l y ougett ot heFCP.I tl ook sc ompl i c at edbuti tr eal l y i s n’ taf t ery ou’ v edonei tac oupl et i mes .

.raphin# the Pressure Drop !rom ICP to "CP:

Thel as tpar toft heI CWFKi l l Sheeti spl ot t i ngoutt hepr es sur edr opper100s t r ok esas y ougof r om I CPt oFCPwhenpumpi ngk i l l wei ghtmuddownt hedr i l l s t r i ng.I ti sus ual l y n otr equ i r e do na na c t ua lI WCFe x am bu ti nc as ey ouwa nt e dt ok no w wh ati tmi g htl o ok l i k e,her ey ougo!

Understanding the Formulas: Onen i c et h i n ga bou tt h eI WCFe x am i st h aty o u’ l l b eg i v e nac o pyoft heI WCFf o r mu l a s heett ous easpar tofy ourt es t .Al t hought hi si sconv eni ent ,I ’ l l war ny ounott ogetov er

c onfi dentaboutt ak i ngt hee xam.Atfi r s t ,It houghtt hatasl ongasIhadt hef or mul a s heetav ai l abl eIdi dn’ tr eal l yneedt os t udyt hepr obl ems .Thet r ut hi s ,t hemor ey ou under s t andt hef or mul asandwhent ous et hem,t hebe t t eroffy ou ’ l l bec omet es tda y . Th eI WCFe x a ma l mo s ta l wa y sg i v e sy o uWA Ymo r ei n f o r ma t i o nt h any o une edt o ans wert heques t i on.Thi si swhyi ti ss oi mpor t antt ounder s t andex ac t l ywhatt he ques t i oni sas k i nga ndwhi c hs pec i fi cf or mul ai sneededt oans wert heques t i on. Ther ewi l l bemanyi ns t anc eswheny ou’ l l needt or ef ert ot woormor ef or mul ast oget t hec or r ec tans wer .Li k ewi s e,t her ewi l l bet i meswheny ou’ r egi v enar i di c ul ousamount ofi nf or mat i onandt heans weri sac t ual l ygi v ent oy ouaspar toft hepr obl em. Themor epr obl emsy ougot hr ough,t hemor ey o uwi l l b ee x pos edt ot he“ t r i c k y ” pr obl emsandt hebet t erpr epar edy ou’ l l bef ort es tday . T r ysol v i ngasma manypr obl emsasy ouc anwi t houtr ef er r i ngt ot hef or mul as heet .T r yt o t hi nky ourwa yt hr oughwhatt hepr obl em i sas k i n ga ndwhaty oua ct ual l yneedt os ol v e f ort ogett heans wer . Fore xampl e,i fy ou’ r et r i ppi ngpi peout“ wet ”andy ouwantt ok nowwhatt hebot t om hol e pr es sur edr opi spers t andofdr i l l pi pe,t r yt ot hi nky ourwayt hr oughwhaty ouneedt o s ol v ef or … I nt hi sc as ey ou’ r es ol v i ngf ort hr eet hi ngs : y o un ee dt ofi g ur eo utt hev o l u me meo fmu db ei n gdi s p l a ce db yt heme t a li ne ac h "irst  s t andofdr i l l pi pet hati sbei ngr emov edf r om t hec as i ngorr i s er( dependi ngoni fy ou’ r e onas ur f ac eors ubs eawel l ) .Si nc ey ou’ r epul l i ngi t“ wet ”y ou’ l l al s oneedt oac countf or t hei nt er nal c apac i t yoft hedr i l l pi pe( f ul l ofmud)bei ngr emov edaswel l ( notj us tt he met al d i s pl ac ement ) . ou’ l l needt ofi gur eouthowf art hel ev el ofmudi nt her i s erorc as i ngwi l l Secondl+,y dr oppers t andaseac hs t andofdr i l l pi pei spul l edout( s i nc ey ou’ r el os i ngt hemet al di s pl ac ementv ol umeandt hei nt er nal c apac i t yv ol umeoft hepi pe,t hemudl ev el i nt he c as i ngorr i s erwi l l dr op) . ou’ l l needt oc al c ul at ewhatt her es ul t antpr es sur edr opi spers t andduet o "inall+,y t hedr oppi ngfl ui dl ev el i nt her i s erorc as i ng.Forex ampl e,a10f tdr opi nfl ui dl ev el meansat enf tl os sofhy dr os t at i cpr es sur e. Th eg oo dn ewsi st h ef o r mu l as he etp r o v i d edt oy o ud ur i n gt h eI WCFe x a mc o mb mb i n esa l l t hr eeoft hes ec al c ul at i onsi nt oones i mpl ef or mul a.Thebadnewsi si fy oudon’ t under s t andwhati sac t ual l ygoi ngoni nt hef or mul at her ei sagoodc hanc et haty ou

won’ tbeabl et oadaptwhenaques t i oni sas k edt hati s n’ te xac t l yaddr es s edbyoneof t hes p ec i fi cf or mu l a s( whi c hh ap pe nsqu i t eab i to nt h eI WCFe x am) .

Understa nding U Understanding U! !ube" #ottom $ole and Formation Pressure: An ot he rf u nd ame nt a lc o nc ep ty o u’ l l n eedt oma st ert od owe l l o nt h eI WCFe x am i s under s t and i ngUT ubebal anc e,f or mat i onpr es s ur eandbo t t om ho l epr es s ur e. Re me me mb mb er ,f o r ma t i o n "ormation Pressure s/ Bottom )ole Pressure:   pr es sur ei st heac t ual pr es sur eoft hef or mat i ony ouar edr i l l i ngi nt o.Bot t om hol e pr es sur ei st hepr es sur eatt hebot t om oft hewel l t hati scr eat edbyt hehy dr os t at i c wei ghtoft hemudi nt hewel l pl usanyaddi t i onal f or c escr eat edbyannul arf r i c t i onf r om c i r c ul at i ngmudt hr ought hewel l .Thegoal i st omai nt ai nbot t om hol epr es s ur eabo v e f or mat i onpr es sur et opr ev entf or mat i onfl ui dsf r om ent er i ngt hewel l ( i . e.t ak i ngak i c kor i nfl ux ) .Ont hefl i ps i de,i ft oomuc hbot t om hol epr es sur ei sappl i edt ot hef or mat i ony ou c oul df r ac t ur et hewel l whi c hc oul dal l owdr i l l i ngfl ui dst oent ert hef or mat i on( l os t c i r c ul at i on) .I nt ur n,t hi swoul dc aus et hemudl ev el i ny ourwel l t odr opwhi c hc oul d ev ent ual l yl eadt oadr opi nhy dr os t at i cpr es sur ewhi c hc oul dal l owal ar geri nfl uxi nt ot he wel l bor e.

Yo un ee dt ound er s t an dh owt h eut ub ei s 01%ube:  al wa y sbal anc ede v ent houghy o uma yseedi ff er entpr es s ur er eadi ngsont hedr i l l pi pe andpr es s ur egauges .I nal mos tev er yI WCFwel l c ont r ol s i t uat i on,t hecas i nggauge r eadshi ghert hant hedr i l l pi pepr es sur e.Thi si sbec aus et hel i ght er“ i nfl ux ”( f or mat i on fl ui d)ont hec as i ngs i deoft heUT ubei sl i ght erandt her ef or eex er t i ngl es spr es sur e downont hebot t om hol et hant he“ c l ean”dr i l l i ngmudt hati si nt hedr i l l pi pes i deoft he UT ube.Thi sl os sofh ydr os t at i cpr es s ur ei scompens at edbyt hei nc r eas ei nc as i ng p r e s s u r e .

I nt heex ampl et ot her i ght ,y ouc ans eet hatt hedr i l l s t r i ngi sf ul l ofc l eandr i l l i ngmud e v ent hr ought her ei sani nfl uxi nt hewel l .Bec aus ey o uha v eak no wnc ol umnoffl ui di n t hedr i l l pi pey ouc anfi gur eoutt hef or mat i onpr es sur ebysi mpl yaddi ngt hedr i l l pi pe r eadi ngt ot hehy dr os t at i cpr es s ur eoft hedr i l l i ngmudi nt hedr i l l pi pe.Youc an’ tdot hi s wi t ht hec as i ngg au geb ec aus ey o udon ’ tk no wt hedens i t yoft hei nfl uxi nt heannul usof t hewel l ( buti twi l l al mos tal way sbel es st hant hedr i l l i ngmud) .Theaddi t i onal 200ps i ont hec as i nggaugei st headdi t i onal pr es s ur eneededt ok eept heUT ubebal anc ed bet weent hecas i ngs i deandt hedr i l l pi pepr es sur es i de. Under s t andi ngt hi sc onc epti sv er ybenefi c i al wheny ous t ar ts t udy i ngt hepr ac t i c e ques t i ons .I ti ses pec i al l yhel pf ul whendet er mi ni ngwhathappenst oc as i ngpr es sur e, d r i l l p i p ep r e s su r ean dbo t t om h ol ep r e s su r ewh enh y dr a ul i cc han ge sa r ema dewh en c i r c ul at i ngoutak i c k( pl uggedbi t ,c hangei np umps peed,was hedo utc hok e ,pl u gged c hok e,et c . ) .I ti sequal l yhel pf ul f orP&Pques t i onssuc hascal c ul at i ngt hepr es sur eat t hec as i ngs hoewhent her ear es ev er al di ffer entl ay er soffl ui di nt hehy dr os t at i cc ol umn. AsImen t i o ne dwi t ht hef o r mu l a sa bo v e,t h emo r ey o uc a nt h i n ky o urwa yt h r o ug ha pr obl em andunder s t andwhati sbei ngas k ed,t heeas i eri twi l l bef ory out oans wert he ques t i on.