Gl3 08
_ DEPTH MEASUREMENTS WITH WIRELINE AND MWD LOGS:
Matthew Kirkman, Baker Hughes INTEQ
Per Seim, Statoil
Curindustry has historically used the term ‘depth’ loosely and accommodated the errors inherent in
different definitions of depth between drillers and loggers. Changes to our approach to defining
targets, placement of horizontal sections and MWD logging demand a review of the approach to
depth measurement and an understanding of errors in alimate methods of measurement
INTRODUCTION
“Tue eg anayst ten vio data peepared tom a numberof
Atorert sowese,coaced a ered ies eutg te wel
‘Tne cota might eae MVD, madogpng, iene ge and
‘se data at procoted a oat aun vs eth
‘ont cpt measuingtchnqu wl ge an stele
‘aotorhotdoph arts importa tah cer
‘ceoee, Deni sleencer equ require repealed
‘Goes corrlaion saced ons common paren sueh a
‘tural garns rato (gure 162). However, by easing
oss wor, the woklnvlea a covelaing ge
lepine wie rodund ard when otal
lopaatons such as pororaing are eared ot ite may
[Saved ¥ overs angoete we inne. Agoalo
‘peasy ectoesaeertogningehnigute Som has
‘en proposed but ls boyondtheroach peso
eennigue.
‘TYPES OF MEASUREMENT
A. Wretng
Wrens tot ae rn ether on cic andar eae
bcronmainewihou slocied conducts Cole blog
‘aasuromera neve ini propertia to wiele dep,
‘fat scontnuos rel ol age ved
Depth meseung ual seo a wheal aprons
40m darelar hed spans eta. fe hie cal
Taco og tra when sana lh hl, the
(alevece pan ured isthe comptes tom hla doth
‘Thine sccomplahed by macsurg te eng oleae
pau vn galrg io theta, Ns usual comet
ESrweineonsiontasedonsvich chats, bute
‘arly done dyramicly wih charges nfnson Ths
spe tach concn sa satan don
‘he lbpgng rn Seng arin maybe tore
Shire condes ola combination singuben mene
‘hema physi ayer, thas adr doph Se
between tae onthe same ton hg)
“The ors inwealne measurement se casted by fe
to erect elects cf mars posue on he
[Goan bi varaton Ine apense he baaeg
(Sef tension and irparture eect ore cate
‘Frese of magne mare an resuea bat ona
{hoimget ol hae ero, br haslesratan aaa
‘Crave. Thee sours ol ere sr gare
‘Serusredin move ean Append"
Common o any ota toma of messuonsnton 2
‘ngs oral to compart aoe on oe
heat, nll cheng tha poston he ig relive to
{hocnatioa, Tis means ta east as tea
level changos rom barat presse ed blasting
‘may go uncoreced, Same operas howeet, have
Inetito a yom fr cores coneenaion ug he
Dogg fn, andthe oo of ggg ced rd a at 8
{anor ralarnce (Figure 3), Peal erase
‘Seeuesodin etal nApperdx 8
‘nen eaceting wine data tom dvd was on
‘area din te competion general aces on
‘otatondla tome pmeteteot Arbo nea
‘rhe matali mstod used ayer tr that
tad ter cps, tere may ba Sas betnoes
verte! sping
“To amour cf depth iting nesta ono es
{Tam sore contactor ohunenoggg un ny
tous spots snindoston ona exet wieina
epi prodlon n some ras
NNoTice: THis MATERIAL is PROTECTED
BY COPYRIGHT LA
(MLE T7US.cODE)Dring based measorements
Daeg based measurement inte hoa fom
iliog contactor, mc logging eats and MWD
‘anacors, Cashg and tusing deh ae sini,
hlsting dpi, but are ndopander of pe. Those
Gaetan rcamenston
‘sting components, iby bye earn Ding
‘dod atthe suave pb he pp bing des ta
Sristing th sre
Mud logging and MUD contractor evry
‘arr tochnigueso mensre ne ners ton
tanievng io the hola: Those hese monhorng
{evolors of eter he damon domo the sheaves
[nthe crown box, montoig te pajot ot atin wie
omected othe Wareing Bock ot messtng the
hterate preset ofa pressured sd onan the
‘Piling wbx an to
For ting Higs, most md nging and MAD conics
tae amatton& gue a ar aero dpah
fsarnce, thus aiming tne prtime tins
‘oponci"h. Pralans stecng teva measurements
re acuree in Append o>
Since tis desrabia rod cumulatve ers, good pipe
Iessuy practice byte siting conractor thease
{etlwed, bt gore eres nracordng or euming te
athe ctor do coc Usual. no ton made
‘ices ongersivn which
“Tenperatue, taooing tom dierent presi snd
sion fe th measurement bt taconite
‘hos elgieart. Th let ot temper, anor
Bressue nthe ep is eviawecn“hopands O° The
ig crater es cap oa
uaa foot or mer, based one lng ott
tilting component ran blow oa al, when
hangrg reo angi ouching th bo: T eons
‘ho rien ae msimum tension, and ecto
{ereion by supering some ofthe esa weight on
the btm of he ol asso an appaerinrese i,
ep, Inver o make het cracons sestiely,
‘erect hoolend value ara mpartat (2) AtDogh
IS imporant to correct eds orth temps o oo
by subconracors aad cenlengSatha wih ho
Ang contractor (Ppa 8) The MHD ed aging
‘orators say bred byte oporiseing
psonnalo report dept conestent wth ile. AL
Feast one me bpaingconrarauomaizaycorcad
{ertotin sein star tha late 1670 for
casas ale of panevaton ekulaton in adion 0
opin, but th amt was dacovred bares
Idan was ot edu acces conetion A
‘ae dileg cots om proving fnson
Correct ROP daa burt cape on sre (3)
20
Prior toa cea opaaion euch a catego
orimencomert of an MWD rns common
‘ho pps stands secorbld Into arc Aone
open can amare gos err tan as ao
‘usin duo he efrances bette he onina tal
Sndthesvepped gure. Th pipeinbe cata ake
Under compres tam Bs oun wag we be erg
‘ossrement wc normaly faker ontba caval
[MWD is tie dopansent measuremon, nd wh reat
Sina rarest, caeton mot bamsso one opus
‘eauné nm and tora ol aly. Ins ease ct
freon toe, ganda of Bt dept tse ine mut
Boccumted se sures On sorry alo
ener ine marry dase than anges wh cuaco
‘medals sn tha opt rod
‘concuusion.
‘Ther fe considerable oom or improvement indepth
measurements rege Tne userct ogsneed cece #
‘hoy wish ota tie problem, One arb aprench
weld before syst a approsch acre sore
{nares for dep. Any eavecone made whan grarontng
Kaa les ne conser
‘evareie. When presarng ops on vercal or plant
‘pte, te coun a ha suvay da andi eesti
‘modal used fe the depth shoul ud. oy