drill cost rate

8/9/2019 Drill Cost Rate

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PETE 411Well Drilling

Lesson 4

Drilling Cost & Drilling Rate


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Contents

The AFE

Drilling Cost and Bit Change

Factors Affecting Drilling RateBit Weight, Rotary Speed

Bottom-hole Cleaning

Md !roperties, Solids Content"ydrostatics


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HW #2. ADE 1.12, 1.13, 1.14 Due Friday, Sept. 13, 2002

Read: ADE, Ch. 1 (All)

Learn: Rig Compoet! " De#iitio!

Assignments


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4

e!ore getting a""roal to drill a $ell t%e

Drilling Engineer mst "re"are an A'E

( a detailed )ost estimate !or t%e $ell

DR# C$M!%ETED

"$%E

&'TA'(&B%E C$STS ) )

TA'(&B%E C$STS ) )

$%$A& C%S$ ' '


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5

A*TH+R-AT+ '+R E/PEDT*RE 0A'E

EE*D+$RE DR- %&E C%/&E$ED (24. DA-S) (32. DA-S)

+*$A*+&E C%S$S %$CAT&$' !RE!ARAT&$' *+,+++ ,+++

DR&%%&'( R&( A'D T$$%S ./0,10 *,1* DR&%%&'( F%2&DS 11*,3* 11,/4 RE'TA% E52&!ME'T 44,0/ 1**,40 CEME'T&'( 3/,* 3,*/

S2!!$RT SER6&CES 1.,.0 .4,30 TRA'S!$RTAT&$' 4+,.++ 0*,3++ S2!ER6&S&$' A'D ADM&'7 .*,.0. *+,4/1 S"$%$A& 14,2 1,125,1

$A*+&E C%S$S

T2B2%AR E52&!ME'T 3+,1+1 03,./ WE%% "EAD E52&!ME'T 1,03 1,.+1 C$M!%ET&$' E52&!ME'T + 1,414

S"$%$A& 422,5 1,01,446

S"$%$A& 1,236,3 2,14,02

7 C%*$+*E*C- (18 99) 1,423,66 2,455,62


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Drilling Cost s. Time

DE$#t

DA-S or D%&&ARS

TD


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Drilling Cost Analsis

$he Drillig Egieer:

Recommends drilling procedres that

8ill safely drill and complete the 8ellat the lo8est cost possi9le

Ma:es recommendations concerningroutie rig operatio!;


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T%e Drilling Engineer

E;ample!o# routie rig operatio!

drilling flid treatment

pmp operation

9it selection

handling pro9lems dring thedrilling process


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T%e Drilling Cost E3ation:

Cf= drilling cost, )


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Eam"le 1.5

A recommended 9it program is 9eing prepared fora ne8 8ell sing 9it performance records fromnear9y 8ells7

Drilling performance records for three 9its aresho8n for a thic: limestone formation at /,+++ ft7

Determine 8hich 9it gies the lo8est drilling cost ifthe operating cost of the rig is )3++


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Assme that each of the 9its 8as operated atnear the minimm cost per foot attaina9le forthat 9it7

Mean

Bit Rotating Connection !enetrationCost Time Time RateBit >)? >hors? >hors? >ft


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7oltion:

The cost per foot drilled for each 9it typecan 9e compted sing E7 1717 For Bit

A, the cost per foot is

071*

?417+0713>3++0++Cf =

+++=

ft

)

D

?ttt>CCC

tc9r9f

=

+++


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7oltion:

Similarly, for Bit B,

71.

?437+47-4>3++/++,3Cf =+++=

ft)

D?ttt>CCC

tc9r9f

= +++


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7oltion, )ont6d

Finally, for Bit C,

.71+

?4-7+07/->3++-++,3Cf =

+++=

ft)

D?ttt>CCC

tc9r9f

= +++


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7oltion, )ont6d

Bit A; )3701


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Drilling Costs

Tend to increase e;poetially 8ithdepth7 Ths, 8hen cre-fitting drilling

cost data, it is often conenient toassme a relationship 9et8een total8ell cost, C, and depth, D, gien 9y

C= ae8D 77>1714?


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Drilling Costs, )ont6d

Constants aand bdepend primarily on the8ell location7

Sho8n on the ne=t page is a least-sares

cre fit of the soth %oisiana completed8ell data gien in Ta9le 1747

Depth range of 4,++ ft to .1,+++ ft7

For these data,a @1 1+ dollars

b@. 1+-3 ft-17

C= aebD


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Fig. 1"5. &ea!t"!>uare ?ur@e #it o# 16 ?ompleted ell?o!t! #or ell! Belo 6,00 #t i the !outh &oui!iaa area.


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19

Penetration Rate

When maor ariations are not present inthe s9srface lithology, the penetrationratesally decreases e=ponentially 8ith

depth7 2nder these conditions, thepeetratio ratecan 9e related to depth,D, 9y

8here anda2

are constants7

)18.1,........(Kedt

d !303.2 2

=W"#?


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Drilling Time

The drilling time,td , reired to drill to agien depth can 9e o9tained 9y separating

aria9les and integrating7 Separatingaria9les gies

dDedtF Da*+*7.D

+

t

+

.d

=

$%te&'!ti%& !%d sol(i%& )o' tdyields

?1/7177777>?7777777771e>Fa*+*7.

1t Da*+*7.

.

d.

=


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Drilling Time )ont6d

lottig depth @!. drillig time #rom pa!tdrillig operatio!:

A. Allo8s more accrate prediction of time andcost for drilling a ne8 8ell

. &s sed in ealating ne8 drilling

procedres >designed to redce drillingtime to a gien depth?7


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E/A9PLE ( Cost "er !t

t R D $otal Co!t C# hr #ph #t ' '


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Cost "er !t !or one entire 8it rn

Minimum Cost

0

60

50

0

40


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E)onomi) Pro)edre in a8oe Ta8le

Can pll 9it after a9ot . hr7 >)3.7+


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E)onomi) Pro)edre in a8oe Ta8le

Also sed 8ith tngsten car9ide insert9its 8hen inserts are 9ro:en orplled ot of the matri=7

2nfortnately, 8ear rate 8ith insert9its is npredicta9le7

Economically, the insert 9it shold 9eplled 8hen the cost in )


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E)onomi) Pro)edre in Ta8le

Bits plled for economic reasons ma:eit hard to o9tain 8ear information7

$perator might pll 9it after 1.+ hrofse 9t part of 9it might get left in

hole7 Recoery is ery difficlt7 AoidG

4Hof roc: 9its are plled green or9efore the 9it is 8orn ot7


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An increase in

T$R52E mayindicate that a 9itshold 9e plled7

E=perience oftendictates 8hen to

pll 9it >footage orhors?7


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'a)tors t%at a!!e)t Penetration Rate

Type of Drill 9it

Bit 8eight

Rotary speed

Bottom-hole cleaning

Md properties

Roc: hardness

Formation pore pressre

6aria9les;

Fi=ed Factors;


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it 7ele)tion is 8ased on

!ast 9it records

(eologic predictions of lithology

Drilling costs in )


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it Weig%t and Rotar 7"eed

&ncreasing 9it 8eight and rotary speed9oosts drilling rate

These increases accelerate 9it 8ear

Field tests sho8 that drilling rateincreases more or less in directproportion to 9it 8eight

40 000 lB#


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Co!ider 10 hole

(dot o@erdo)

D r

i l l i g R

a t e

, # t < h

r

it eight ; 1,000 lB


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Dr

illi

g

Ra t

e ,

#t


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D r

i l l i g R

a t e , # t < h

r

EFFEC$ %F ACG RESSREGeep HBit = ?o!t.= 0 p!i


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D r i l l i g

R a t

e , # t < h

r

ydro!tati? re!!ure, 1,000! o# p!i

EFFEC$ %F ACG RESSRE0 " ,000 p!i


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35Drillig $ime, day!

Depth,

#t

Drilled ith ga!

Drilled ith mud

EFFEC$ %F DR+&&+* F&+Dmud @!. ga!


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Depth,

#t

Rotatig $ime, hour!

EFFEC$ %F DR+&&+* F&+Dater @!. air


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RelativeDrillingRate,

%

%ld !tyle ater ?our!e Bit!


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EFFEC$ %F S%&+DS +* $E /D


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Hdrostati) Pressre radient

Fresh Water !ressre (radient @ +73**psi


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Hdrostati) Pressre

ith 14 lB


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Hdrostati) Pressre Re3ired

e+th-0.052

'essu'eWei&ht/ude1ui'ed =

What md 8eight is reired to9alance a pore pressre of 1+,+++psig at a ertical depth of 1.,+++ ftJ

12,000-0.05210,000Wei&ht/udeui'ed =

M = 16.!3 l"#gal

drill cost rate

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