SLB FIELD HANDBOOK 1984

8/7/2019 SLB FIELD HANDBOOK 1984

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F IE LD O PE RA TIN G H AN DB OO K· V OL . II

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N o r m a l l y a f t e r t h e w e l l s t r e a m l e a v e s t h e W e l l H e a d , t h e p r e s s u r e i s r e d u c e d i n s t a g e s . A f t e r t h e p r e s s u r ei s r e d u c e d , p r o c e s s c o m p o n e n t s o f l o w e r p r e s s u r e r a t i n g m a y b e u s e d .

T h e r u l e i s t h a t a p r e s s u r e c o n t a i n i n g p r o c e s s c o m p o n e n t s h o u l d :

~ e i t h e r b e d e s i g n e d t o w i t h s t a n d t h e m a x i m u m i n t e r n a l p r e s s u r e w h i c h c a n b e e x e r t e d o n i t u n d e r a n y c o n ~d i t i o n s ,

- o r b e p r o t e c t e d b y a p r e s s u r e r e l i e v i n g d e v f c e [ S a f e t y R e l i e f V a l v e o r R u p t u r e D i s c ) .

T o d e t e r m i n e t h e s y s t e m d e s i g n p r e s s u r e r a t i n g s i t i s n e c e s s a r y to s h o w p r e s s u r e r a t i n g b o u n d a r i e s o nm e c h a n i c a l f l o w s h e e t s s u c h a s s h o w n o n p a g e S A F . 6 . E a c h s e c t i o n o f f l o w l i n e o r p r o c e s s c o m p o n e n t h a s a na ss ig ne d o p er at in g p re ss ur e, e .g .:

~ F r o m t h e F l o w h e a d d o w n t o t h e F l o o r C h o ~ e M a n i f o l d t h e w o r k i n g p r e s s u r e m u s t b e h i g h e r t h a n t h e s h u t - i nt u b i n g p r e s s u r e . T h i s w i l l l e a d t o t h e c h o i c e o f t h e F l o o r C h o k e M a n i f o l d A s s e m b l y .

!F O R S U B S E Q U E N T S E C T I O N S T H E W O R K I N G P R E S S U R E I S D E T E R M I N E D T O S U I T P I P I N G C O N N E C T I O N S .

P i p i n g s a n d / o r e q u i p m e n t s a r e c o i o u r c o d e d t o r e c o g n i z e t h e i r w o r k i n g p r e s s u r e :

O ra ng e m ea ns 3000 p s i W P ( 6000 p s i T P )

R e d 5000 p s i W P (10000 ps. i T P )

B l a c k 10000 p s i W P (15000 p s i T P )

W h i t e 15000 p s i W P (22500 p s i T P )

T h e i t e m w i t h t h e l o w e s t p r e s s u r e r a t i ~ g w i t h i n a s e c t i o n d e t e r m i n e s t h e p r e s s u r e r a t i n g o f t h i s s e c t i o n

M a k e s u r e t h e W e l l H e a d e q u i p m e n t d o w n t o t h e C h o k e M a n i f o l d i s a b l e to w i t h s t a n d t h e m a x i m u m e x p e c t e ds h ut - in p r es s u r e .,

A l l o t h e r c o m p o n e n t s a r e p r o t e c t e d b y m a k i n g s u r e t h a t p r e s s u r e w i l l _ a l w a y s , r e m a i n l o w e r t h a n , t h e r a t , e d _ ,

w o r k i n g p r e s s u r e .

F o r a l l c o m p o n e n t s w h e r e w o r k i n g p r e s s u r e i s l o w e r t h a n t h e s h u t - i n W e l l H e a d p r e s s u r e , t h i s p r o t e c t i o ni s p r o v i d e d b y a n o r m a l l y c l o s e d ( N C ) S u r f a c e S a f e t y V a l v e ( S S V ) l o c a t e d o n t h e f l o w l i n e a n d r e m o t e l yc o n t r o l l e d b y p i l o t s p r e f e r a b l y l o c a t e d o n e a c h p r e s s u r e s e c t i o n . T h e s e p i l o t s a r e a d j u s t e d to r e s p o n dw h e n e v e r p r e s s u r e i n c r e a s e s a b o v e t h e a l l o w e d W . P . o f e a c h o f t h e s e s e c t i o n s .

O n h i g h p r e s s u r e t e s t s (5000 p s i < W H P < 10000 p s i ) o r i n c a s e o f s o u r g a s , t h e S u r f a c e S a f e t y V a l v em u s t b e i n s t a l l e d u p s t r e a m o f t h e F l o o r C h o k e M a n i f o l d .

T h e S u r f a c e S a f e t y V a l v e i s a c t u a t e d by f l o w l i n e p r e s s u r e s e n s o r s p r o v i d e d o n e a c h f l o w l i n e s e g m e n t o fd i f f e r e n t w o r k i n g p r e s s u r e d o w n t o t h e s e p a r a t o r . '

A d d i t i o n a l s a f e t y i s i n s u r e d b y t h e u s e o f a n e m e r g e n c y s h u t - d o w n s y s t e m J E S D ) a c t i n g o n t h e F l a w l i n eV a l v e o f t h e F l o w h e a d . U s e o f E S D i s s t r o n g l y r e c o m m e n d e d w h e n e v e r W H p r e s s u r e e x c e e d s 5000 p si .

O n v e r y h i g h p r e ss u r e, t e st s (10000 p s i < W H P < 15000 p s i 1 t h e r e i s a n A u t o m a t i c C h o k e , r e d u c i n g t h ep r e s s u r e to 10000 p s i i m m e d i a t e l y a f t e r t h e F l o w L i n e V a l v e . A l l p r e c e e d i n g r e m a r k s r e m a i n v a l i d.

I n c a s e o f s o u r g a s o r h i g h p r e s s u r e t e s t s (> 5000 p s i ) i t i s m a n d a t o r y t h a t o n e o f t h e E S D s t a t i o n s b es e t - u p a t t h e s e p a r a t o r , o t h e r s t a t 1 0 n s w i l l b e s e t - u p a c c o r d , n g t o t h ~ c u s t o m e r ' s l n s t r u c t 1 o n s . H o w e v e rl t IS r e c o m m e n d e d t h a t t h e s t a t i o n s t o s h u t - i n t h e E S D b e p r o v i d e d o n e a c h f l o w l i n e s e g m e n t o f d i f f e -r e n t w o r k i n g p r e s s u r e d o w n t o t h e o i l a n d g a s m a n i f o l d s .

W h e n n o S u r f a c e S a f e t y V a l v e i s u s e d , i t i s t h e o p e r a t o r ' s r e s p o n s i b i l i t y t o c h e c k a n d m a k e s u r e t h a tt h e p r e s s u r e a l w a y s r e m a i n l o w e r t h a n t h e w o r k i n g p r e s s u r e a s s i g n e d t o e a c h s e c t i o n .

T h e s e p a r a t o r i s p r o v i d e d w i t h p r e s s u r e r e l i e v i n g d e v i c e s ( F a r r i s S a f e t y V a l v e a n d R u p t u r e D i s c ) .



F I E L D O P E R A T I N G H A N D B O O K · V O L . I I


SA F · G 6

No v emb e r 1 9 84

c ) P r a c tic a l H in t 5

T o r q u e s t o m a k e - u p s u b - a s s e m b l i e s t o g e t h e r m u s t s t r i c t l y b e o b s e r v e d ( s e e r e l e v a n t c h a p t e r s ) .

U s e o n l y r e c o m m e n d e d f i t t i n q s a n d c o n n e c t i o n s 1 i s t e d i n C h a p t e r I I I " G E N E R A L I N F O R M A T I O N " .

H a v e e n o u g h C h i c k s a n s b e t w e e n F l o w h e a d a n d f l o o r , o n f l o a t i n g r i g s t o a l l o w f o r m a x i m u m e x p e c t e d h e a v em o t i o n .

I n c a s e o f g a s , i f u s e o f C h i k s a n c a n n o t b e a v o i d e d , g r e a s e t h e B a l l B e a r i n g s o f C h i k s a n S w i v e l s a n dc h a n g e t h e p a c k i n g b e f o r e t e s t l n g .

C h o k e s s h a l l e x c l u s i v e l y b e u s e d f o r f l o w c o n t r o l . N E V E R U S E T H E M T O S H U T - I N T H E F L O W . A n y f l u i d f l o w i n gt h r o u g h a c h o k e m u s t a r r i v e p e r p e n d i c u l a r y t o t h e n e e d l e o f t h e c h o k e a n d l e a . v e i t i n t h e d i r e c t i o n o ft h e n e e d l e t i p ,

G a u g e t a n k s s h o u l d b e g r o u n d e d b y a c a b l e a l l o w i n g s t a t i c e l e c t r i c i t y ( g e n e r a t e d b y f r i c t i o n o f f l o w i n gf l u i d s ) t o f l o w a n d a v o i d i n g f l a s h e s . T h i s c a b l e s h o u l d h a v e a m i n i m u m s e c t i o n o f 1 c m 2 .

O f f - s h o r e , i t i s c o n n e c t e d t o a b l a n k s p o t f r e e o f p a i n t o r g r e a s e o n t h e b a r g e .

O n - s h o r e , t h e g r o u n d s h o u l d b e a n i r o n s t a k e a t l e a s t 1 m l o n g , d r i v e n i n t o t h e e a r t h a n d w a t e r e d r e g u -1 a r i l y ( o n c e a d a y ) .

I N N O C A S E A l l O W G A S T O F L O W T O T H E T A N K .

P e c u l i a r p r e c a u t i o n s m u s t b e t a k e n i n t e s t i n g w e l l s p r o d u c i n g s a n d o r s e d i m e n t s s i n c e t h i s m a y l e a d t of a s t e r o s i o n o f t h e p i p e s a n d e q u i p m e n t , e s p e c i a l l y if v e l o c i t y i s m o r e t h a n 3 0 m / s e c . I n s u c h c a s e sc o n s t a n t m o n i t o r i n g o f s a n d p r o d u c t i o n a n d u s e o f s a n d t r a p s i s h i g h l y r e c o m m e n d e d . ( S e e F Q H I V - S A N DM E A S U R E M E N T S ) •

C O R R O S I O N D E T E C T I O N I N W . T . E Q U I P M E N T P I P E S

I n t h e F I T - T R I M p r o c e d u r e s f o r :

- M a n i f o l d s

H ea t er s - S te am E x ch an g er s,

- S ep ar at o rs , • ..

it i s r e c o m m e n d e d t o p e r f o r m a t h i c k n e s s m e a s u r e m e n t o f t h e a c c e s s i b l e p i p e w a l l s w i t h a n U l t r a s o n i cT h i c k n e s s D e t e c t o r s u c h a s t h e " K r a u t k r e m e r D M 2 " .

T h i s d e t e c t o r i s a l r e a d y i n c l u d e d i n t h e 2 c h a n n e l y o r t a b l e S A N D E C e q u i p m e n t u n d e r L 8 4 2 8 4 7 .

M e a s u r e m e n t s s h o u l d b e m a d e o n i n l e t a n d o u t l e t e l b o w s , t e e s . . • e t c . w h e r e m a x i m u m e r o s i o n i s t o b e e x -p e c t e d .

A r e c o r d o f t h e t h i c k n e s s m e a s u r e m e n t o n f i x e d r e f e r e n c e p o i n t s c h o o s e n b y t h e o p e r a t o r w i l l h e l p t ot r a c e c o r r o s i o n o r ' e r o s i o n a n d a v o i d u n e x p e c t e d f a i l u r e s .

T h e " k r a u t k r a m e r O M 2 " w o r k s i n a m b i e n t t e m p e r a t u r e s r a n g i n g f r o m - 1 0 t o S O · C ( 1 5 t o 1 2 5 · F ) . -

W i t h a s p e c i a l S e n s o r l t c a n o p e r a t e o n h o t s u r f a c e s u p t o 2 0 0 · C ( 4 0 0 · F ) .

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SA F · G 7F I E L D O P E R A T I N G 'H A N D B O O K · V O L . I I

W E L L T E S T IN G N o vem be r 1 98 4

d) P r e s s u r e Te s t s

Prior to any pressure test, m ake sure that ai l flow 1 ines are safety anchored or chained down to .ther ig.

P ressure tests are conducted eXclusively w ith water. W ater may be added w ith corrosion inhibi tors.

It is recommended to let water ffow ,rapidly through the well testing system to sweep out air or gas thatmay be trapped in hi gh spots. " ','c

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Also one thiQg must be clear:

If the API requires that for equ i~me~ts' rated at less than 10000 psi w p the test pressure is 200% of theWP and for equ ipments rated at 100 'OO-,;PSI WP and above the test pressure is 150% of the WP, it m ust beunderstood that these test pressures.vapp ly only for officia l tests, performed at shops w ith adequatefaei l i ties.

IN NO CASE THE RULE SHOULD A PPLY AT THE W ELL SIrE, WHERE A PRESSURE TEST AT M AXIM UM100% OF W P IS ONLYAUT HOR !ZED.

Oevices protected w ith bursting heads or rupture discs shall never be tested at 100% WP, unless thesafety device is removed and replaced by a plug .

A safe lim it for testing these devices is 90% o(WP:-

The record of the pressure tests shoul d be inc'luae<ftn the 'fi .n:al test report. U se the Foxboro Recorderor the DOWELL-SCHLUM BERGERor any other recordera":.~ ,H ab 1 e. '

The fo llow ing pressure testing sequence is mandatory p.rior to any well opening . The d ifferen t sub-assembl i e s are supposed pressure tested i nd i vi dually accord t o s to ' the R ITE PROGRAMME(See rel evantChapters) .

Should the customer requ ires exhaustive testing of the F loor Choke M anifo ld and the Heater's coil s ,B lanking P lugs m ust be installed instead of adjustab le and/or fixed chokes.

O therw ise, always, close the valves located IM MED IATELYUPSTREAMof the Chokes.

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The differen t sections must be hydraulically tested at working pressure .

I S e e tab le and P ressure sequence diagram he re afte r IBest is to use a Serv ice Company pumping unit connected to the kill line of the Flow Head.

d2-Che ckin g the Safety c i r cu i t s

SSV and ESD operation should be checked during § 1 "Testing the Lines".

Do not forget that CAC Actuator located on the Flow Line V alve of the F lopetroT F low Head has a SafetyHead fitted w ith a Bursting D isc (Reference BAKER WH - DBMF - BOO) shearing at 7500 psi (525 bar).

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F IE LD O PE RA TIN G H AN DB OO K· V OL . II

W ELL TES T IN G

SA F · G 8

N o v em b e r 1 98 4

TABLE - PRESSURE TES T ING SEOUENCES

W T E Q UI P M EN T N O M I NA L R A T IN G

1 5 0 00 p s i 1 0 0 0 0 p s i 5 0 0 0 p s i

T e s t P r e s . M a x

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R E M A R K S

B l a n k c h o k e a t ~ . T h e n t e s t a t 1 0 0 0 0 p s iw i th M a n if o l d U p st r e am V a lv e s c l os e d.

B l a n k c h o k e s a t ~ i f r e q u e s t e d . T h e n ,t e s t w i t h c h o k e s i n p l a c e a n d M a n i f o l d U p -s t r e a m V al v e s c l o se d .

B l a n k c h o k e s a t ( E ) i f r e qu e st e d.T h e n t e s t w i t h c h o k e s i n p l a c e a n d M a n i f o l dU p s tr e a m V a l ve s c lo s e d.

1 0 0 0 0N R 5 0 0 0

5 0 0 0 p s i H e a t e ro r 5000 B l a n k c h o k e a t @ a n d B y- P a ss V a l ve c l o se d

S t e a m E x c h a n g e r 5 0 0 0 3000 i f H P c o i l t e s t r e q u e s t e d . O t h e r w i s e c l o s e

GI---------+-----I-------+-----i I n l e t a nd B y -P a ss V a l ve o f H ea t er / S te a mE x c h a n g e r .

1 0 0 0 0 p s i S t e a mE x c h a n g e r * *

7 2 0 S a m e a s a b o v e b u t 7 2 0 o r 6 0 0 p s i s e p a r a t o ru s e d .

3 0 0 0 3000 T h i s t e s t o n l y if P l u g i n s t a l l e d a t G ) o r Q ) .3 0 0 0

2 1 4 4 0 N o p l u g a t ( § ) o r (f) - 1 4 4 0 p s i s e p a r a t o ru s e d . I n l e t M a n u a l V a l v e a n d B y - P a s s M a n u a lV a lv e o f S e p ar a to r closed,

1 4 4 0 1440

3 7 2 0 7 2 0

3 0 0 0 3 0 0 0 T h is t e s t o n ly i f H e a te r / St e am E x c ha n ge rn o t u s e d a n d P l u g i n s t a l l e d a t ~ o r C ! ) .O t h e r wi s e r ef e r to E 2 a n d E 3 .

3 0 0 0

1 1 0 0 0 1 0 0 0 1 0 0 0 1 4 4 0 p s i S e r a r a t o r :M a n u a l I nl e t V a l ve o f S e pa r a to r c l o s ed .M a nu a l O u t le t ( o il & g as ) o f S e p ar a t orc l o s e d .

C DB y -P a s s V a l ve o p en .P l u g s a t ®.

2 7 2 0 7 2 0 · 7 2 0 7 2 0 o r 6 0 0 p s i S e p a r a t o r :S a m e a s a b o v e .

* W h e n u s i n g 1 0 0 0 0 p s i W P S t e a m E x c h a n g e r , F l o o r C h o k e M a n i f o l d i s n o r m a l l y n o t u s e d :

T e s t p r e ss u r e f o r s e q ue n ce C D + G) i s t h u s 1 0 0 0 0 p s i f o r W T e q u i p m e n t 1 5 0 0 0 p s i n o m i n a l p r e s s u r e .

0+ @ i s t h u s 1 0 0 0 0 p s i f o r W T e q u i p m e n t 1 0 0 0 0 p s i n o m i n a l p r e s s u r e .



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W E L L T E S T IN G Nov embe r 1 98 4

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F IE LD O PE RA TIN G H AN D BO O K· V OL . II


SA F · G 10

N o vem be r 1 98 4

e ) E qu ip m en t In sta lla tio n

e1- Safety standards.

The following standards, whichever the no st stringents, have been excerpted either from the APIRP 500 B or from the Safety Recommendations issued by the French Association of the Oil and Gas Ex-plorers and Producers:

Although the spirit of both reglementations does not differ very much, the API RP 500 B is res-tricted to the classification of areas for tlectrical Installations at drilling rigs and productionfacilities on land and off-shore, whereas the French Recommendations cover also disposition of openfires and engines.

There is also a Flopetrol policy, based on experience, to recommend that classified areas within awell testing set-up should not cross or overlap.

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G r o u p B C a t e g o r y B

A t m o s p h e r e s c o n t a i n i n g b u t a d i e n e , e t h y l e n e L i q u i d h y d r o c a r b o n s h a v i n g a f l a s h p o i n t < 5 5 ° Co xi de , h y d ro ge n , p ro py l e ne o xi d e , m an uf a c tu re dg a s e s c o n t a i n i n g m o r e t h a n 30 % h yd ro ge n ( byv o l u m e)

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A tm os p h er es c on t a in in g a c e ta ld e h yd e, c yc l o -p r op a ne , d i et h yl e t he r , e th y le ne , i s op r en e ,U D M H 1 , I - d i m e t h y l h y d r a z i n e

L i gu i d h y dr o ca r bo n s h av in g a f la sh p a in ! ; h et we e n55 a n d 100' C

C . l . L i q u i d s a t a t e m p e r a t u r e e q u a l o r a b o v et h e i r f l a s h p o i n t

C . 2 . L i q u i d s a t a t e m p e r a t u r e b e l o w t h e i r f l a s hp o i n t

;. - -

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A tm os p h er es c on ta i n in g a ce to n e , a cr y l on it r i le ,a m mo n ia , b e nz e ne , b u ta n e, I -b ut an o l ( b ut y la l co h ol ) , 2 -b ut a no l ( se c on d ar y b ut yl a lc on o l } ,n -b ut y a ce t at e , i so bu t yl a c et a te , e th an e ,e t h a n o l ( e t h y l a l c o h o l ) , e t h y l a c e t a t ~ ,e t h yl e n e d i c hl or i d e, g as ol i n e, h ep t a ne > ,h e xa n es , m e th a ne ( n at u ra l g as ) , m et h an o l( me t h yl a lc oh o l ), 3 -m et h y l- l - bu ta n o l ( i s oa my la l c o h o l ) , m e t h y l e t h y l k e t o n e , m e t h y l i s o b u t y lk et on e . 2 -m e t hy l- I - pr op a n ol ( i s ob ut y l a l c ch o l ) ,2 -m et h y l- 2- p r op a n ol ( t e rt ia r y b ut y l al c o ho l l,p e tr o le u m n a ph t a, o ct an e s, p e nt a ne s , I -p en ta n ol( am yl a l c oh o l l , p ro pa n e, I -p ro p an o l ( pr o py la lc oh o l ), 2 -p r o pa n o l ( is op r o py l a l c oh o l ),p ro py l en e , s ty r en e , t o lu e ne , v in y l a ce t at e,

v i ny l c h lo r id e , x y l e ne s

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L i q U i d h y d r o c a r b o n s h a v i n g a f l a s h p o i n t l O O · C

0 . 1 . L i q u i d s a t a t e m p e r a t u r e e q u a l o r a b o v et h e i r f l a s h p o i n t

0 . 2 . L i q u i d s a t a t e m p e r a t u r e b e l o w t h e i r f l a s hp o i n t



SA F - G 12 F I E L D O P E R A T I N G H A N D B O O K - V O L . I I

W E L L -T E S T IN GN o vem be r 1 98 4

. T h e a r e a a r o u n d a W e l l H e a d i s a C l a s s I D i v i s i o n 2 ( o r t y p e 2 z o n e ) w i t h i n a r a d i u s o f :

1 5 m ( 4 5 f t ) o n - s h o r e

1 0 m ( 3 0 f t ) o f f - s ho r e

C A U T I O N : t h e s a m e a r ~ a b e c o m e s a C l a s s I D i v i s i o n l i a r t y p e 1 z o n e i n c a s e o f a n e r u p t i v e w e l l a n di n c a s e o f i n t e r v e n t i o n o f a s e r v i c e u n i t o n t h e W e l l H e a d ~

. T h e a r e a a r o u n d a S e p a r a t o r i s a C l a s s I D i v i s i o n 2 ( o r t y p e 2 z o n e ) w i t h i n a r a d i u s o f :

10 m (30 f t ) o n - s h o r e

3 m (10 f t l o f f - s ho r e

C A U T I O N : t h e a r e a a r o u n d t h e r u p t u r e d i s c p i p e i s a C l a s s I D i v i s i o n 1 ( o r t y p e 1 z o n e ) w i t h i n a

r a d i u s o f 5 m (1 5 f t l a n d a C l a s s I D i v i s i o n 2 ( o r t y p e 2 z o n e ) w i t h i n a r a d i u s o f 10 m(30 f t l.

T h e a r e a a r o u n d a G a u g e Tank i s a C l a s s I D i v i s i o n 1 ( or t yp e 1 z o n e ) w i t h i n a r a d i u s o f :

1 5 m ( 4 5 f t ) o n - s h o r e

1 5 m ( 4 5 f t ) o f f - s h o r e

I n b o t h c a s e s , t h e r e i s a C l a s s I D i v i s i o n 1 ( or t yp e 1 z o n e ) 3 m (15 f t l a b o v e t h e r o o f .

T h e o u t l e t s o f F l a r e s , S a f e t y V a l v e s , V e n t s . . . e t c . a r e c l a s s i f i e d as C l a s s I D i v i s i o n 1 ( or t yp e 1z o n e ) w i t h i n a r a d i u s o f 5 m ( 1 5 f t l a n d a s C l a s s I D i v i s i o n 2 ( or t yp e 2 z o n e ) w i t h i n a r a d i u s o f10 m (30 f t ) .

G a s f i r e d h e a t e r s s h a l l n e v e r b e i n s t a l l e d i n c J a s s i f i e d a r e a s .

O p e n f i r e s s h a l l n e v e r b e u s e d i n c l a s s i f i e d a r e a s . A r e c o n s i d e r e d a s " o p e n f i r e s " a l l s y s t e m s p r o -d u c i n g o r a b l e t o p r o d u c e f l a m e s o r s p a r k s i n o p e n a i r o r h a v i n g s u r f a c e s s u s c e p t i b l e t o r a i s e a th i g h t e m p e r a t u r e , e s p e c i a l l y :

- o v e n , b o i l e r s , f l a r e s ,

- h e a t i n g o r l i g h t i n g s y s t e m s ,

- w el di ng p la nt s,

t h e r m i c e n g i n e s e x c e p t t h e o n e l i s t e d h e r e a f t e r , -

n o n i n t r i n s i c a l l y s a f e e l e c t r i c d e v i c e s o r l i n e s , o r e l e c t r i c m a t e r i a l s n o t i n c o n f o r m i t y w i t h' th e " e x p l os i v e e n v ir o n me nt " t yp e . . . e t c , ,

l i v i n g q u a r t e r s w h e r e t h e r e a r e o v e n s o r p e r m i s s i o n t o s m o k e .

G a s o l i n e e n g i n e a r e n o t a l l o w e d i n c l a s s i f i e d z o n e s .

D i e s e l e n g i n e s a r e a l l o w e d i n c l a s s i f i e d a r e a i f t h e y a r e f i t t e d w i t n a u t o m a t i c s h u t - d o w n d e v i c e sa c t i n g o n t h e i n t a k e a n d e x h a u s t ( o v e r s p e e d i n g l , s p a r k a r r e s t o r s , e x h a u s t p i p e o r i f i c e s o u t o fz o n e 1 , i n e r t i a s t a r t e r s o r s p e c i a l e l e c t r i c s t a r t e r s .

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W E L L T E S T IN G N o vem be r 1 98 4

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O N S H O R E

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W ell H ead

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e 2- R ec om men ded p ra c t is e s

R e m a r k s :

- T h e S e p a r a t o r s h o u l d i n a l l c a s e s p r e f e r a b l y b e l o c a t e d 2 5 m a w a y f r o m t h e W e l l H e a d ( 7 5 f t l .

- O f f - s h o r e , t h i s d i s t a n c e m a y b e r e d u c e d t o 1 3 m ( 4 0 ft). T he s ep ar at or i ns tr um en t c on t ro ls s ho ul db e s u p p l i e d w i t h c o m p r e s s e d a i r o r n i t r o g e n .

T h e r u p t u r e d i s c m u s t b e c o n n e c t e d t o a s p e c i a l l i n e , a t l e a s t 4 " I D l a n d e d j u s t o v e r t h e s e e l e v e la n d h a v i n g e l b o w s w i t h a m i n i m u m r a d i u s o f 6 0 c m ( 2 f t l .

- T a n k s a r e e q u i p p e d w i t h a F l a m e A r r e s t o r . T h e S n i f f e r P i p e m u s t b e c o n n e c t e d t o t h e R i g F l a r e .M o r e o v e r , M a n - H o l e C o v e r s h o u l d b e b o l t e d d u r i n g o p e r a t i o n .

- I n s o m e i n s t a n c e s , d u e t o l a c k o f s p a c e , a l l t h e r e c o m m e n d e d d i s t a n c e s c a n n o t b e r e s p e c t e d , b u t :

E q u i p m e n t m u s t n e v e r b e i n s t a l l e d i n t h e c l a s s i f i e d z o n e o f t h e W e l l H e a d ( t y p e 2 z o n e ) .

F i r e d H e a t e r s , B u r n e r s a n d W i r e L i n e W i n c h e s m u s t n e v e r b e i n s t a l l e d i n c l a s s i f i e d z o n e s .F L O P E T R O L C h i e f O p e r a t o r s h o u l d i n f o r m t h e c l i e n t a b o u t a n y p r o b l e m a n d m e n t i o n i t i n h i s r e p o r t .

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O N S H O R E

a: 3 0m /90 ft (m in .15m /45ft).

b : 3 0m /90 ft

c : 25m /75 ft

e . 3 0m /90 ft (m in.l0m /3 0 ft)

e : 3 0m /90 ft [m in .ttl m /3 0 ft)

f:25m/75ft

W ell H ead

c

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O F F S H O R E

A: 10m/30f t

B : 25m /75ft

c: 15m /45 ft

D: 3m /10 ft

E: 15 m / 45 ft

F : 13m/40f t

Documents

SLB FIELD HANDBOOK 1984