08.Politecnico Di Torino Drill String Composition 2011

8/9/2019 08.Politecnico Di Torino Drill String Composition 2011

1/80

08. DRILL STRING COMPOSITION

1

CHAPTER 8CHAPTER 8

DRILL STRING COMPOSITION FORDRILL STRING COMPOSITION FOR

VERTICAL AND DEVIATED WELLSVERTICAL AND DEVIATED WELLS


2/80


2

8.1. DRILL STRINGS FOR VERTICAL8.1. DRILL STRINGS FOR VERTICAL

WELLSWELLS


3/80


3

Sand

Shale

L!e"#$ne

30%

20%

13 3&8%

' (&8%

)%

0 !

2000 !

*000 !

+000 !

Sand , "hale

Re"e-$-

H/d-$0a

-1$n

SPONTANEOUS DEVIATION


4/80


*


Vertical wells are not vertical at all, because theyare subject to spontaneous deviation from thevertical.

Deviation is the displacement of the boreholefrom the planned straight path caused by theinteraction of the bit with the rock and thephysical mechanical characteristics of the drillstring.

Deviation must be surveyed and kept to a

minimal possible extent as it can cause drillingproblems such as:

failure of the drill string due to fatigue

drill string wear

stuck drillstring caused by keyseating and!or

differential pressure

instability of the formationsetc.


5/80


(

"he main factorswhich cause the deviation of the borehole are:

#ormation types

#ormation dips

$resence and position of stabili%ers in the bottom hole assembly

&nclination of the borehole

'oreholedrill string clearance

(ctual rate of penetration )*+$

CAUSES OF SPONTANEOUS DEVIATION



6/80


+

CAUSES OF SPONTANEOUS DEVIATION

-/0(1&/(2 (/"&+1 /(34D '5 "0 *+/6'&" &1"*(/"&+1 :

"heory of #ormation (nisotropy

"heory of #ormation Drillability

-ini7hipstock "heory

"heory of the Drill /ollar -omentum.

-/0(1&/(2 (/"&+1 &1D3/D '5 "0 4"*&18 +1 "0 '&"

which is connected to:

7eight on the bit

$endulum forces#orces connected to the rigidity and the type of drill string

stabili%ation.



7/80


)

Formation ANISOTROPY theory

In the case of

NONHOMOGENEOS

formations with the presence of INCLINED

lamination planes, the rock is brokenHETEROGENEOUL!

with respect to the a"is of the teeth#

HOMOGENEOUS FORMATIONS



8/80

08. DRILL STRING COMPOSITION8

FORMATION DRILLABILITY THEORY



9/80

08. DRILL STRING COMPOSITION'

MINIWHIPSTOC THEORY

The action of the bit creates fract$res

perpen%ic$lar to the se%imentation la&er,

res$ltin' in the formation of small we%'es

which ca$se borehole %e(iation#



10/80


DRILL COLLAR MOMENT!M THEORY

The as&mmetrical reaction oppose% b&

the soil when passin' from a soft to a

har% formation, or (ice(ersa, 'enerates

a moment$m at the bit which (aries thelen'th, L)an% L*, from the DC tan'enc&

point with the borehole an% thereb&

the lateral force to the bit



11/80


MECHANICAL EFFECTS

CONFIGRATION OF 4ENDING OF THE DRILL STRING AS A

FNCTION OF THE WEIGHT ON THE 4IT

EFFECT OF THE 4ENDING OF THE DRILLSTRING ON THE

4OREHOLE DEFLECTION.



12/80


Theoretical scheme of the forces which affect the borehole %eflection an'le

MECHANICAL EFFECTS

The effect of wei'ht on the +it +acts mainl& on the lateral component of the pen%$l$m force L-./ if 0 1 2 3 the res$ltant Rten%s to increase the %eflection

+/ if 0 3 2 the res$ltant Rcoinci%es with the a"is of the hole 4constant inclination/#

C/ if 0 5 2 the res$ltant Rten%s to brin' the hole back to the (ertical#

+3 6ei'ht on the bit

L3 Lateral component

of the pen%$l$m force

R3Res$ltant force



13/80


13

7 To OPPOSE the nat$ral %e(iation of a well, the si8e of the DRILL TRING

sho$l% be (er& close to that of the borehole, b$t this is ob(io$sl& impossible# Inpractice onl& the lower part of the %rill strin', calle% the +ottom Hole .ssembl& or

+H., is kept to a ma"im$m possible %iameter, b& means of an appropriate

stabili8ation %esi'n#

7Depen%in' on the ten%enc& to %e(iate of the formations, the "#al5a#$n de"6n

an a""7!e 7#e d99e-en# $n967-a#$n"#

8.1. DRILL STRINGS FOR VERTICAL WELLS8.1. DRILL STRINGS FOR VERTICAL WELLS


14/80


1*

STABILIZATION OF THEDRILL STRING

8.1. DRILL STRINGS FOR VERTICAL WELLS8.1. DRILL STRINGS FOR VERTICAL WELLS


15/80


1(

T/:al R$#a-/ D-ll S#-n6

Drill Pipes

Heavy Wate (intermediate stiffness pipes)

X-over

Drill Collars

Jar (Shock tool to be activated hile drill strin! is st"ck)

Drill Collars

Stabili#er (for hole reamin!)

Drill Collar

Shock absorber (vibrations dampener)

Stabili#er

Drill Collar (Short Drill Collar)$ear bit

Drillin! bit

8.1. VERTICAL WELLS; DRILL STRINGS COMPONENTS8.1. VERTICAL WELLS; DRILL STRINGS COMPONENTS


16/80


1+

Drill Collars

Hea/< #h=>alled "#eel ::e" :laed e#>een #he d-ll ::e" and

#he # #$ a::l/ >e6h# 7:$n #he # ?11@ DC" >e6h 7: #$ **( =69&!.

In "$!e a"e" ":-al $lla-" #$ a$d "#=n6 :-$le!" $- "7a-e

$lla-" an e 7"ed.

Ae-a6e len6#h " 7"7all/ a-$7nd '.( !.

Th-eaded $nne#$n" ?!ale a# $ne end and 9e!ale a# #he $#he-enale #ha# !7l#:le $lla-" an e "-e>ed #$6e#he- al$n6 >#h

$#he- d$>n h$le #$$l" #$ $!:$"e #he $##$! h$le a""e!l/ ?4HA.



17/80


1)

/onnections +D

inch

&D

inch

7eight

6g!m

1/ 9;< ; 9!; = >!; [email protected]!>? >;@.;

1/ ?BA B = >9!>? ===.!= 9 9==.@

DRILLCOLLARS



18/80


18

Stabilizers

Sh$-# :ee $9 ::e ?11.( ! >#h "#eel ":-al lade" $9

#he "a!e da!e#e- $9 #he # $- "l6h#l/ "!alle-.

In #h" >a/ # " :$""le #$ =ee: #he h$le e-#al.

The "#al5e-" a-e n"#alled e#>een #he d-ll $lla-".



19/80


1'

Ite!ral Bla"e" Stabilisersare manufactured from (&4& ;>;0 modified steel. (ll 4tabilisersare bored, drifted and fully heat treated to meet or exceed the mechanical property reCuirementsof 14>. ( throughwall hardness range of =B9;> 0' and a charpy EVF notch impact strength of;= joules at =AG/ are guaranteed one inch below the surface. 4tabilisers are available in both

EopenF design and EtightF design, near bit or string, and can be supplied in alloy or nonmagneticsteel.

API Coe#tio(ll ($& connections comply with dimensional reCuirements specified in ($& 4pec < and ($& *$


20/80


20

Drilli! .ar

A !ehanal dee 7"ed d$>n

h$le #$ dele- an !:a# l$ad #$

an$#he- d$>n h$le $!:$nen#hen #h" $!:$nen# " "#7=.

The-e a-e #>$ :-!a-/ #/:e";h/d-a7l Ba-"

!ehanal Ba-"

a-" an e de"6ned #$ "#-=e

7:< d$>n $- $#h.



21/80


22/80

8 1 VERTICAL WELLS DRILL STRINGS COMPONENTS8 1 VERTICAL WELLS DRILL STRINGS COMPONENTS


23/80


23

Drill Pi'es

T77la- "#eel ::e"< han6 an $7#"de da!e#e- 9-$! 2 3&8@ #$ + (&8@ >#h

>e6h#" 9-$! 10 #$ *0 =6&!< 9##ed >#h ":eal #h-eaded end" alled #$$l

B$n#".

The d-ll ::e" $nne# #he -6 "7-9ae e7:!en# >#h #he $##$! h$lea""e!l/ and #he #< $#h #$ :7!: d-lln6 9l7d #$ #he # and #$ e ale

#$ -a"e< l$>e- and -$#a#e #he $##$! h$le a""e!l/ and #he #.

The ae-a6e len6#h 9$- a "n6le ::e " '.( !.

Tool

9ointsDrill

collars

Drillpipes


8 1 VERTICAL WELLS DRILL STRINGS COMPONENTS8 1 VERTICAL WELLS DRILL STRINGS COMPONENTS


24/80


2*

M*D DRILL

COLLAR

STABILIZER .AR HEAV0

*EIGHT

DRILL

PIPE


8 1 VERTICAL WELLS DRILL STRINGS COMPONENTS8 1 VERTICAL WELLS; DRILL STRINGS COMPONENTS


25/80


2(

Drilli!

Roller

Rea+er


8 1 VERTICAL WELLS; DRILL STRINGS COMPONENTS8 1 VERTICAL WELLS; DRILL STRINGS COMPONENTS


26/80


2+

Hole O'eers

Hole Openers are (ersatile tools$se% for hole enlar'ements, $p to:;


27/80


2)

The l$>e-!$"# :$-#$n $9 #he d-ll "#-n6< $n""#n6 $9 ?"#a-#n6 9-$! #he

$##$!;#" #he $n#-$l $9

#he #-aBe#$-/ ?d-e#$n and nlna#$n $9 #he >ell.

O9#en #he 4HA nl7de" a !7d !$#$-< "$!e d-e#$nal d-lln6 and!ea"7-n6 e7:!en#< !ea"7-e!en#">hled-lln6 #$$l"< l$66n6

>hled-lln6 #$$l" and $#he- ":eal5ed dee".



28/80


28

8.2. DRILL STRINGS FOR8.2. DRILL STRINGS FOR

DEVIATED WELLSDEVIATED WELLS

8 2 DIRECTIONAL DRILLING; WHEN8 2 DIRECTIONAL DRILLING; WHEN


29/80


2'

Directional %rillin' is $se% in a n$mber of operational sit$ations, the most rec$rrent of

which are liste% below#

Multi-well drilling from a single locationMulti-well drilling from a single location. This sol$tion is applie% both offshorean%

onshore# In the former case, where it has been s&stematicall& $se% for (er& man& &ears,the main reason for appl&in' s$ch a sol$tion is the nee% to minimi8e a fiel%=s %rillin' an%

e"ploitation costs# This is %$e to the fact that, from a sin'le platform 4A/, it is possible to

%rill a 'reat n$mber of wells 4e(en more than thirt&/, whereas, if the (ertical well option

ha% been chosen, it wo$l% be necessar& to %rill them one b& one with %e%icate% ri's an%

then connect each of them to the same pro%$ction platform#

In the case of onshore wells, besi%es the nee% to re%$ce the %rillin' an% pro%$ction

costs of the fiel%, the main reason for $sin' a sin'le cl$ster is the nee% to re%$ce theen(ironmental impact of the operations, especiall& when workin' in areas s$ch as parks,

nat$ral reser(es an% habitats of certain protecte% animal an% plant species# Onshore

%irectional %rillin' has been a%opte% more recentl& than offshore %irectional %rillin'# In

partic$lar it sprea% after the intro%$ction of hori8ontal %rillin' %$e to the $n%eniable

a%(anta'es that it also brin's in terms of increase% well pro%$cti(it

8.2. DIRECTIONAL DRILLING; WHEN8.2. DIRECTIONAL DRILLING; WHEN

8 2 DIRECTIONAL DRILLING; WHEN8.2. DIRECTIONAL DRILLING; WHEN


30/80


30

Inaccessible placesInaccessible places. Resortin' to the %rillin' of %e(iate% an% hori8ontal wells is

$na(oi%able when the tar'et is locate% in mo$ntains re'ions or below or ri(ers 4C/, or in

an& circ$mstance where it is %iffic$lt or costl& to set $p the %rillin' ri' %irectl& o(er the

(ertical of the tar'et#

rilling in salt domes or in particular geological formationsrilling in salt domes or in particular geological formations . In or%er to reach a

tar'et locate% below formations %iffic$lt to %rill 4e#'#, salt %omes, e"tensi(e fa$lts/, it is

sometimes preferable to start %rillin' the well laterall& with respect to the str$ct$re an%

then %e(iate aro$n% the >cap= of the salt %ome 4E/, or perpen%ic$larl& to the fa$lt plane to

minimi8e the nat$ral ten%enc& of the hole to %eflect 44/ which co$l% ca$se 'reat

problems in maintainin' the inclination an% the %irection#

Sidetrac!ingSidetrac!ing. 6hen a section of hole becomes $nworkable %$e to pipe stickin' orfail$re, or when the tar'et is chan'e% once the %rillin' has alrea%& starte%, a new hole is

%rille% startin' from the ma"im$m %epth where the well pro(es to be free 4D/ to later take

$p %rillin' a'ain in a %irection which is compatible with the newl& planne% well path#

"elief wells"elief wells# These %irectional wells are %rille% to intercept a formation from which a well

is blowin' o$t with the main p$rpose to >kill= it 4F6./#




31/80


31

D-e#$nal D-lln6

Earl& .pplications4California, )?@2=s/




32/80


32

A::la#$n" $9 d-e#$nal >ell"




33/80


33

D-lln6 a -ele9 >ell ?-6h# #$ =ll@ a l$>$7# n :-$6-e"" ?"le $n #he le9#nh$le M$#$-

D-ll 4#

H/d-a7lS#ee-n6 A""/

D-ll S#-n6 M7d C$l7!n

S7-9aeA""e!l/

S#and P:eP-e""7-eSen"$-

S7-9ae C$n#-$l n#

Plan A#7al $$!

C$--e#$n

C7--en# L$a#$n

P-$:$"edL$a#$n

TFO

DLS

D-lln6Pa-a!e#e-"

0.1*

de6.

Re!$#e D-lle-"D":la/

VERTITRA

D$>nh$le S7-9ae C$!!7na#$n


49/80

AUTOTRA8 ,DEVIATED *ELLS-

DOWNHOLE MOTORSDOWNHOLE MOTORS


50/80

A2toTra5 Feat2res

*otary /losed 2oop Drilling 4ystem can change well trajectory while rotating

expandable ribs create a lateral force on the bit and forma controlled closedloop with -7D

AUTOTRA8 ,DEVIATED *ELLS-



51/80


(1

E:andale S#al5e- Pad

T$: S#al5e-

F$-!a#$n Eal7a#$n S7

Fle S7 >#h

S$nde Ele#-$n"

N$n R$#a#n6 Sleee

Al#e-na#$- & H/d-a7l S7

AUTOTRA8RCLS ?R$#a-/ Cl$"ed L$$: S/"#e!



52/80


(2

S#anda-d S#ee-ale D-lln6 S/"#e! andAutotrak ComparisonAutotrak Comparison

A2totra5A2totra5

Sta"ar" steerableSta"ar" steerable

8.3. DIRECTIONAL WELLS CONFIGRATIONS


53/80


(3

There are three basic confi'$rations for a %irectional well-

t&pe )- slant hole profile

t&pe *-


54/80


(*

SLANTHOLE CONFIGRATION

In this t&pe of hole confi'$ration, the #O#F#

is place% at low %epths after the ma"im$man'le of inclination has been reache% %$rin'the b$il%


55/80


((

SSHAPED HOLE CONFIGRATION

.lso in this case, the #O#F# is place% at low

%epths# .fter the ma"im$m planne%inclination has been attaine%, it is maintaine%$ntil the lar'est part of the %isplacement has

been reali8e%#

This confi'$ration is $se% in str$ct$re where%ifferent tar'ets are present an% when there

is the necessit& to hit the tar'et (erticall&, b$twith a certain %isplacement from the s$rface

location of the well#

The #O#F# is place% near the s$rface

beca$se trips are short an% the b$il%


56/80


(+

SHAPE HOLE CONFIGRATION

This sol$tion is preferre% in special

sit$ations as, for instance, when %rillin'close to fa$lts or salt %omes or in presence

of partic$lar 'eolo'ical re$irements#

In this case the #O#F is place% %eep inthe well an% m$ch closer to the ob9ecti(e#

Once the ma"im$m inclination has beenobtaine%, the inclination an'le is kept

constant till the tar'et#

8.*.SELECTION OF THE GEOMETRIC PARAMETERS


57/80


()

Once the e"act location of the well is known as well as the tar'et to reach 4in

terms of 'eo'raphic or 'ri% coor%inates an% %epth/ %ifferent well profiles can be

%rawn for reachin' the tar'ets tro$'h (ario$s combination of-

kick


58/80


(8

Generall& speakin' the (al$es the ma"im$m inclination an'le, +UR an% DROF can

preferabl& ass$me ran'e as follows-

ANGLE GRADE OF

DIFFICULT0

COMMENTS

A>M "o be avoided Difficulty in controlling the directionL tendency to have

holes with freCuent variations in inclination. "he problems

can be overcome if steerable systems are used.

>9AM 8ood 8ood *+$L good control of direction, no particular hole

problems.

9AM +ptimal

9AAM 8ood $rogressive decrease in *+$ with increase in inclination

angles.

A?AM (cceptable 2ow *+$L risks of pipe sticking.

?AM and

more

*eCuires the use of

proper techniCues

$ipe sticking problems, high torCue and drag, low *+$.

GENERAL CONSIDERATIONS ON INCLINATION ANGLE



59/80


('

ANGLE GRADE OF

DIFFICULT0

COMMENTS

A>,M!9A m 1ot recommended Difficulty in controlling the directionL buildup section too

longL to be used in case of very hard formations

>,9,AM!9A m +ptimal

9,,AM!9A m *isky $roblems on the pipe due to fatigueL eventual difficulties

in running casings.

N ,Ao and more "o be avoided )in

normal deviated

wells

*isk of pipes failure.

GENERAL CONSIDERATIONS ON 4ILDP RATE



60/80


+0

ANGLE GRADE OF

DIFFICULT0

COMMENTS

A>,M!9A m 1ot recommended Difficulty in controlling the directionL dropoff section too

long.

>,=,M!9A m +ptimal

-ore than =,M "o be avoided 0igh torCueL abnormal wear of the drill stringL risks of

keyseating.

GENERAL CONSIDERATIONS ON DROPOFF RATE


61/80


+1

8.(. HORIONTAL WELLS

Hori8ontal wells ha(e become in the last %eca%e a wi%esprea% an% $ite common

8.(.1. INTRODCTION


62/80


+2

Hori8ontal wells ha(e become in the last %eca%e a wi%esprea% an% $ite common

techni$e all o(er the worl%, beca$se the& lea% to a wi%e ran'e of benefits, s$ch

as-

increase% rate of ret$rn from the reser(oirimpro(e% reco(erable reser(esre%$ce% %e(elopment in(estments'reater profitabilit& in mar'inal fiel% %e(elopment#

The main scope of hori8ontal %rillin' is, clearl&, to enhance h&%rocarbons

pro%$cti(it& an% reco(er& b& e"posin' lon'er sections of the reser(oir to %raina'ewith respect to (ertical wells, in s$ch a wa& to obtain more rapi% an% consistent

economical benefits#

H i t l % illi h t i l li ti i f ti

8.(.2. WHERE TO DRILL A HORIONTAL WELL


63/80


+3

Hori8ontal %rillin' has t&pical applications in formations as-fract$re% carbonatessan%stones#

.n&how, this practice can not be in%iscriminatel& applie%, b$t, on the contrar&, it

re$ires selecte% en(ironments an% 'i(es the best res$lts when applie% to

acc$ratel& screene% scenarios#

In 'eneral hori8ontal %rillin' fin%s its application in-nat$rall& fract$re% reser(oirs%iscontin$o$s reser(oirswater an% 'as conin' prone reser(oirsti'ht san%s an% carbonateshea(& oil poolsshallow or thin be%senhance% oil reco(er& pro9ects#

ince the %rillin' of hori8ontal wells is more comple" an% e"pensi(e than



64/80


+*

comparable (ertical or stan%ar% %e(iate% wells, the main reason to %rill a hori8ontal

hole is to pro%$ce more an% at better reser(oir con%itions#

or achie(in' this 'oal, all the si'nificant characteristics of the reser(oir m$st beknown an% all (ariables 4both on s$rface an% %ownhole/ acc$ratel& e(al$ate% in

or%er to make the most acc$rate economic anal&sis#

Reser(oir, Geolo'& an% Fro%$ction En'ineers are the most concerne% in this

phase of the pro9ect# creenin' of the most s$itable reser(oir is essential in or%er

to obtain a satisfactor& o$tcome the followin' parameters ha(e to be assesse%-reser(oir characteristicsreser(oir potentialact$al an% e"pecte% pro%$ction ratespro%$ction %ecline c$r(e%ri(in' mechanismschances of 'asAwater conin' problems

thickness, areal e"tent an% 'eolo'ical hetero'eneities of the reser(oir#

Once 'i(en an answer to these $estions, the ne"t phase foresees the

i l t f th D illi % C l ti E i h t k i t % fi



65/80


+(

in(ol(ement of the Drillin' an% Completion En'ineers, whose task is to %efine-hole 'eometr&%rillstrin' %esi'n

anticipate% hole %rillin' problems 4circ$lation losses, pipe stickin', hole cleanin', tor$e an% %ra', etc#/casin' %esi'nm$% an% cementin' pro'rammesh&%ra$lic pro'rammebit selection

%e(iation an% orientation e$ipment selectioncompletion, stim$lation an% work


66/80


++

$mmari8in', 6$$d andda#e" 9$- h$-5$n#al d-lln6are reser(oirs with-'as or water conin' ten%encieslow permeabilit&

low (ir'in formation press$renat$ral (ertical fract$resthin or ti'ht reser(oirs(isco$s oil reser(oirsfa$lte%A%iscontin$e% 8ones#

P$$- andda#e"ma& be i%entifie% with the followin' characteristics-lease constraintslow pro%$cti(it& or %eplete% reser(oirsse(ere %rillin' an% completion problemsthin an% m$ltila&ere% reser(oirsthick pa&s with low (ertical permeabilit&mar'inall& economical fiel%s#

6e ha(e alrea%& o$tline% the main moti(ations we ha(e to %rill a hori8ontal

well Now we %eepen some of these moti(ations with rele(ant a%(anta'es

10.2.*.1. HORIONTAL WELLS; ADVANTAGES


67/80


+)

well# Now, we %eepen some of these moti(ations with rele(ant a%(anta'es

which merit a partic$lar anal&sis-

1. n-ea"ed :-$d7##/ ea7"e $9 a l$n6e- "e#$n $9 h$le e:$"ed

2. n-ea"ed :-$d7##/ #h-$76h #he $nne#$n $9 e-#al $- "7e-#al

9-a#7-e"

3. a$dane $9 :-$le!" / !ean" $9 6a" and >a#e- $nn6 $n#-$l

*. !an/ $#he- a::la#$n"s$ch as- %rillin' aro$n% topo'raphical restrictions,

pro%$ction of 'as from coal seams, minimi8ation of en(ironmental impact, EORpro9ect enhancement, etc#

ENIVIRONMENTAL IMPACT OF SRFACE LOCATIONS AND FACILITIES

10.2.*.1. HORIONTAL WELLS; ADVANTAGES


68/80


+8

WHILE DEVELOPING A FIELD WITH VERTICAL WELLS

The main %isa%(anta'es of hori8ontal wells are 'enerall& linke% to %rillin' an%

10.2.*.2. HORIONTAL WELLS; DISADVANTAGES


69/80


+'

The main %isa%(anta'es of hori8ontal wells are 'enerall& linke% to %rillin' an%completion %iffic$lties, s$ch as-

7R$nnin' e$ipment in an% o$t of hole- %rill strin', casin', cables

7 Fre(entin'Areme%&in' %ifferential stickin'

7 E"cessi(e tor$e

7Cleanin' the hole an% pre(entin' c$ttin's from settlin' alon' the hole

bottom

7 Controllin' wei'ht on bit to achie(e an% maintain %irectional control

7 Cementin' casin' or liner

In s$mmar&, this is the sit$ation re'ar%in' hori8ontal wells-

10.2.*.3. HORIONTAL WELLS; SMMARJ


70/80


)0

7Hori8ontal wells ma& pro%$ce at @


71/80

The basic characteristics %istin'$ishin' these three cate'ories are as follows-

10.2.(. TJPES OF HORIONTAL WELLS


72/80


)2

LONG RADIS

< R#O#C#- *22 < ?22 m 4;22 < *22 ft/ 4R#O#C# 3 )K2A4P " +#U#R#/Q/

< +#U#R#- * < KBA@2 m< Lateral Len'th- ;22 < );22 m 4*222 < 222 ft/

MEDIM RADIS

< R#O#C#- K2 < *22 m 4@22 < ;22 ft/

< +#U#R#- K < *2BA@2 m 4$p to 2


73/80


)3

H$-5$n#al Well Cla""9a#$n

10.2.(.1. LONG RADIS HORIONTAL WELLS


74/80


)*

The l$n6 -ad7" approach allows to %rill (er& lon' hori8ontal sections 4aro$n%

*222 m an% $p to K222 m/ with stan%ar% rotar& e$ipment an% hole si8es# The

10.2.(.1. LONG RADIS HORIONTAL WELLS


75/80


)(

p / & p

b$il%


76/80


)+

The !ed7! -ad7"option is, in a certain wa&, a compromise between the lon' an%

short ra%i$s metho%s an% combines both a%(anta'es an% %isa%(anta'es of each# In

10.2.(.2. MEDIM RADIS HORIONTAL WELLS


77/80


))

'eneral, it allows for a better %efinition of the tar'et an% an easier %irectional control#

This techni$e emplo&s stan%ar% %rillin' e$ipment if the +UR is low, while mo%ifie%

con(entional %rillin' e$ipment is recommen%e% if the +UR is hi'h# 6ith the me%i$mra%i$s wells, b$il%


78/80


)8

casin' shoe re$ire% to start the kick


79/80


)'

The main a%(anta'e of the "h$-# -ad7"wells is the abilit& to precisel& control

the %epth of the hori8ontal hole# The& ha(e rates of b$il%


80/80


80

@22BA@2 m 4)22 ft/ an% the total (ertical hei'ht of this confi'$ration ran'es from ;

to )2 m an% has an acc$rac& of onl& 2,; m# The len'th of the lateral 4hori8ontal/

section is limite% an% (aries between ;2 to @22 m 4*22

Date post:	01-Jun-2018
Category:	Documents
Upload:	fabrizio
View:	215 times
Download:	0 times

08.Politecnico Di Torino Drill String Composition 2011

Documents