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1985 PLAN OF EXPLORA'ION

oULF OF MFX1C0: OFFSHORE LOUISIANA

WEST CAMERON APEA

BLOCK 247 (OCS G 4760)

SONAT EXPLORATION COMPANY

Ju ly 24, 1985

D. E. Richard^ Superv isor o f D r i l l i n g Engineer ing

Scnat Exp lo ra t ion Company P.O. Eox 1513

Houston, Texas 77251-1513 Phone: 713/940-4014

SONAT EXPLORATION COMPANY •JFST CAMERON BLOCK 247 (OCS G 4760)

OFFSHORE LOUISIANA

(UBL IC INFORMATION COPY)

In compl iance wi th 30 CFR 2SC.34, the fo l l ow ing i n f o rma t i on i s submit ted f o r the p lanned explorat ion a c t i v i t i e s :

1. Sonat plans to d r i l l an a d d i t i o n a l exp lo ra to ry we l l 1n West Cameron Block 247 . This well requ i res approximately 20 days to d r i l l and eva lua te . A t i m e t a b l e is enclosed (Attachment 1 ) . The sur face l o c a t i o n of t h i s w e l l , w i t h respect to Block 247, i s :

Wei 1 Surface l o c a t i o n

0-A 3000* FNL and 4700' FEL o f Block 247

(See Attachment 7a)

2. S ince th is plan i s f o r a supplemental exp lo ra to ry w e l l , Sonat d id not i n c l u d e an Environmental Report .

3. The one exploratory w e l l w i l l be d r i l l e d using a t y p i c a l jack -up r i g s i m i l a r to the Ocean Leader d r i l l i n g u n i t . A d e s c r i p t i o n of the r i g and o f features per ta in ing t o sa fe ty and to p o l l u t i o n p r r v e n t i o n and con t ro l a r e enclosed (Attachment 2a -2b ) . The d r i l l i n g r i g i<. the f a c i l i t y , under t h i s p lan, which is capable of producing a i r p o l l u t i o n . The main sources o f a i r po l l u t i on on the r i g w i l l be the f o l l o w i n g engines: Three GMC V-149 's which w i l l d r i v e the ro ta ry and drawworks; two EMD 160567's to d r i v e the mud pumps; and a L i s t e r 3R3 to d r i ve the genera to rs . During cement ing , one 8V-71 d i e s e l engine w i l l be used.

Based on EPA emission f a c t o r s , a l l of the f a c i l i t i e s proposed in t h i s SPOE a r e expected to produce the fo l l ow ing t o t a l q u a n t i t i e s of p o l l u t a n t s in one year 's t ime:

To ta l Emissions fo r A l l Calcu la ted Exemptions P o l l u t a n t F a c i l i t i e s ( t o n s / y r ) E ( t o n s / y r )

Carbon Monoxide 9.47 52,825 N i t rogen Oxides 43.fcl 1,998 S u l f u r Oxides 2.91 1,998 P a r t i c u l a t e s 3.13 1,998 Hydrocarbons 3.49 1,998 Aldehydes 0.65 1,998

The t o t a l emissions f o r t h i s proposed f a c i l i t y i s c l e a r l y exempted from f u r t h e r a i r q u a l i t y rev iew under 30 CFR 2 5 0 . 5 7 - l ( d ) f o r one y e a r ' s o p e r a t i o n . Projected emissions and the basis f o r a l l c a l c u l a t i o n s are a t tached (Attachments 3a and 3b) .

SEDPPC4e5?061C

A v i c i n i t y map, which locates West Camero.. Block 247, with respect to the Louisiana coast, is enclosed (Attachment *V

Onshore support f a c i l i t i e s for d r i l l i ng operations 1n Block 247 w i l l be located in Intracoastal C i t y , Louisiana. Sonat 1s leasing space from a t ransportat ion vendor. A 24 hour communication base 1s established and the vendor's dock loading f a c i l i t i e s are being used in our current d r i l l i n g a c t i v i t i e s . The a c t i v i t y 1n th is SPOE w i l l not require any new or modified onshore f ac i l i t i es .

Water depth at West Cameron Block 247 ranges from 72.5' to 80.5 ' . The Ocean Leader is capable of working in a maximum water depth of 150' dur ing the hurricane season and has d r i l l i ng footage capacity of 25,000'. The r i g is therefore capable of d r i l l i ng the proposed we l l , while providing maximum personnel and equipment safety. Planned well control operation to surface casing depth incorporate a diverter system and annular (BAG) type blowout preventers and a d r i l l i n g spool to be insta l led on drive pipe wh i le d r i l l i n g the hole for conductor casing. The same diverter spool and blowout preventers w i l l be instal led on the conductor casing or drive pipe (whichever is applicable) while d r i l l i ng the hole for the surface casing. For d r i l l i n g below the surface casing, blowout prevention equipment w i l l i nc lude : four (4) remote-controlled, hydraul lcal ly operated blowout preventers, including two (2) equipped with pipe rams, one (1) with b l ind rams, and one (1) annular (BAG) type; a d r i l l i n g spool; a choke l ine and man i fo ld ; a k i l l l ine and a f i l l - u p l ine.

An archeological survey has been submitted and the data clears most of the lease block for d r i l l i n g . The proposed a c t i v i t y in th is SPOE w i l l not a f f ec t the cultural resources of this lease.

The wel l w i l l be d r i l l e d 1n accordance with the relevant OCS orders. A l l reasonable precautions w i l l be taken to ovoid any o i l or waste s p i l l s a.«d the Sonat Oil Spi l l Contingency Plan (approved 1/21/85) shall be fo l lowed in the event of such a s p i l l . This plan 1s on f i l e in the New Orleans off ice of the Mimrals Management Service and is available for publ ic Inspection. Attached are excerpts from the document showing the equipment to operate i t , and information or response procedures w i t h i n Sonat (See Attachment 6 a - i ) . Sonat is a member of the Clean Gulf Associat ion.

Also enclosed is Sonat's Coastal Zone Management Consistency Cer t i f ica t ion f o r the act iv i t ies described in this SPOE.

A Mud Component List is included. (Set Attachment 11)

ATTACHMENTS

1. T imetab le

2. R1g Descr ipt ion

3. Emissions Ca lcu la t ions

4. V i d n i t y Kap

6. Exc?rpts from Sonat 's O i l S p i l l Contingency Plan

7. Sur face Location P la t

10. Coasta l Zone Consistency C e r t i f i c a t i o n

11. Mud Component L i s t

SEDRP04P52CM0

ATTACHE*.* I

SONAT DPLOPA'ION COMPANV

West Cameror Voc> i f 'OCS G 4760)

Offshore, Louisiana

TIMETABLE

OPERATION DATES

Drill anc" Evaluate «D-A ~ tober '., :9lt. thru October 21, 1985

SEDRP04e520421

G'CEAN LEADER BETHLEHEW MAT SUPPORTED JACK-UP

Platlorm 11 AT ' 180 ' OUARTERS For «S men

MFLIrOhT ($•£< Capacny)

ClE'RANCES & DIMENSIONS

DIMENSIONS OPERATING DEPTH

A E C D E M i K i M N P Maximum Norma' Saiton

Minimum

Dtear. LttOK 15' <! » ' 61 • BO' ?'?• rr m • 10' « ' 175' "75 ' 1»' 24

ATTACHMENT 2a

A: :A KMI • :

Derrick

M t i f

T riveting Equipment

MuC rumps

Mufl Mu Pumps

SIMM Sfc#k#i

Itunot'

St f j t l t t r

D t l r.pe

Dm Cc'.#' i

BO"

e r p Centre1 Svstem

Dueler System

Cho»c MamtotC

RiC rower

Cranes

O C E A N L E A D E R

P R I N C I P A L E Q U I P M E N T

P p t n t 1*7 ' a 3fi 1 tt * DDC 00C it Mat* MO* -c»C capacit

• e tfnja fitnMf j CMC c tv» enpiies *a»rr.ac $c

* *e anc ' - 3 /6 * flrii une

:? • ; ' * ? r w c : 'Mf'C HO fl'ive un-:

E -oth NMMXM iOCT MOO* Nl Crown EmtCC I t * * ! "BS S w r l l Satn^-a SOOT : r.tf'.or.c N 160C flu:, ei ea: 1 M t t f t l M M " • : . • ' : . : » / : • • •

0»<se engines

] MtMUMI fc » t CtMHkiftl ever t • t i hp Wj l

; Mf tMf f. • r ce'.:-itupa- grivti "• metatl N Usance • Daiitai

DranOl Cua: ri<p s;>eec

i MM :• ".?'cones Desnif I Mi l If < * r c f :

Swau Katy l iM i i i ' r HWfttMMMM

10.000 ct 5* OD. Graoe E ! CO: 01 • • OD. Graoe C

?i H / 2 " OD. 18 • 7-3/«" 00

1 13 6>/f", 5.000 psi WP G* HyCni 1 13 '- f " t 000 ps *ype U WipM BftvtflMN

Kaomty *60 pa-or. accumulate- MtJl fMOfk anc a • MMM flrMti * i «•«: M conuo or, iioo* anc I * MMM*l remote Centre

6* nose ic p ipm; HrWi a*' va'ves MfCtl s>Oe

! OCC pl wrfl> Swact demote c k(

2 • Kate 650 kw AC pene-aiors ea:* driver. t>> a 12-149 ciesei enp-ne

lit I V i m £50 peaesia mounec RM'Mf crane wttti E: B O : - i-ec £• 101 . - • Mannar S0C peoesta meuniec mar t * crane wtt*i 16 &00"" raiec ai 30T

STORAGE CAPACITIES

Bulk MuC < 500 CU ft Bulk Cement. 2.6*0 Cu ft Licuifi MoC 1.600 BO'S

Diesel "uei 1,550 Ecu Potabie Water: LOO BD'S M l Water: 3.1-4C BDis

Sack Maienai 3 CDC sacks

ATTACHMENT 3a FACILITY: Ocean Leader

OPERATING EMISSIONS FREQUENCY DURATION TIME EMISSION

SOURCE (Operations/yr) (Days/Op.) (Days/yr \ POLLUTANT FACTOR(g/hphr) Hp. g/hr lbs/day tons/yr

Three GMC 1 21 ?1 Carbon Monoxide 3. .030 5200 15,756 8j4 8.75 V-149*s Nitrogen Oxides 14 .000 72,800 3853 40.50

Sulfur Oxides 0. .931 4,841 256 2.69 Two EMD 1 ?\ 21 Particulates 1. 000 5,200 275 2.89 lf>0567's Exhaust Hydrocarbons 1. . 120 5,824 308 3.23

Aldehydes 0 .210 1,092 58 0.60 One Lister 3RB 1 21 21

One 8V-71 2 1 2 Carbon Monox ide 3. .030 425 I,286 68.2 0. 72 Diesel Engine Nitrogen Oxides 14. .000 5,950 314.9 3.31

Sulfur Oxides 0. .931 396 20.9 0.?? Particulates I . 000 425 22.5 0.24 Exhaust Hydrocarbons i 120 4 76 25.2 0.26 Aldehydes n. 210 89 4.7 0.05

The maximum time the rig will be in operation on this location is 21 days.

Sample Calculations: Total CO- for Facility • Sum of CO- sources 1 -- 8.75 • 0.72

(Frequency, op/yr) (Duration, days/op.) - Operating time (days/yr.) - 9.47 tons/yr. (1 oper./yr.) (21 Days/oper.) • 21 Days/yr.

(Emission Factor, g/hphr) (Horsepower, hp) • Emission (g./hr) (3.0.10 g/hphr) (5200 hp) - 15.7W g./hr. (15.756 q/hr) (?4 hr./day) (0.002205 lbs./g.) • 833.8 lbs./day (R33.R lbs/day) (?} day/yr) (1 ton/'OOO lbs) = 8.75 tons/yr.

SEDRP04R52O4?!

ATTACHMENT 3b FACILITY: Ocean Leader

TOTAL EMISSIONS

FACILITY POLLUTANT TOTAL EMISSION (tons/yr.) EXEMPTIONS

Carbon Monoxide 9.47 52,825 Nitrogen Oxides 43.81 1,998 Sulfur Oxides 2.91 1,998 Particulates 3.13 1,998 Exhaust Hydrocarbons 3.49 1,998 Aldehydes 0.65 1 998

Exemption Calcultions: E « 3400 0 i/J) T Distance from facility to nearest shoreline • 60 miles • 3400 (60) Z , i

• 52,825 tons/year (for COJ E • 33.3 D e

• 33.3 (60) • 1998 tons/yr. (For N02, S02, TSP. and VOC's)

SEDRP048520421

AT:A KHDll -

SCrMAT EXPLORATION

WEST CAMERON BLK. 2 4 7

V ic in i ty Map

ATTACHMENT 6a

DIRECT RESPONSIBILITIES

FIELD

Supervisors - (1)

tt)

Pumpers and (1) Roustabouts

Catering Crew and ( I ) any Service Personnel - (2)

Amelia/Intra- -; coastal City Ease Operators (2) (Dispatchers) -

(3)

(*)

(5)

Area Office

Ar*a Super­intendent (1)

tt)

(3)

(*)

Accurately and timely report the disaster to the proper companv personnel and government agenc? es.

Secure the disaster and/or the f a c i l i t y personnel in the safest manner.

Dil i g e n t l y prepare :c assist i r securing the disaster or f a c i l i t y .

As directed by the man in charge.

Prepare tc evacuate the disaster area.

Respond tc ca l l s for transportation o*. personnel •

Relay messages from the platform i n case of telephone f a i l u r e .

Arrange for any taedical assistance.

Alert a i r and sea transportation companies.

Arrange for transportation of s p i l l recovery equipment and personnel xf activated.

Assure that personnel and f l l aftected f a c i l i t i e s are secured in the satest manner.

Notify Base Oreratci (Dispatcher) to provide for transportation and/or medical needs.

Perforn information gathering/rransmitting duties at central location.

Alert and/or dispatch personnel to the o i l s p i l l recovery location.

0?

ATTACHMENT 6b

DIRECT RESPONSIBILITIES

HOI'S TON OFFICE O i l S p i l l Respontc Coordinator (Production/Drilling Superintendent)

1) Analyze the si t u a t i o n to determine i f further action is necessary tc secure disaster location.

2) Determine i f s p i l l recovery is necessary and/or practicable under current conditions.

3) Determine i f strategic personnel should b* dispatched tc their positions.

A) Determine i f f i e l d personnel u t i l i z a t i o n according to plan i s necessary.

5) Heae* s p i l l recovery program.

Operating Assistant

1) Notify Haliburton I f Clean Gulf Associates equipment is to be deployed.

2) Coordinate transportation of s p i l l recovery equipment to s p i l l recovery location.

3) Head the s p i l l recovery team.

£) I f no s p i l l to assist at disaster location.

a. tc determine i f any threats to human safety are present at

disaster location.

b. te gather the input/output data for O.S.H.A.

Purchasing Agent

1) Assist in locat;-.» and dispatching of any boats, outside personnel, or materials needed at the s p i l l recovery location.

Vice-President/Manager of Operations

1) Assure t h t t the N o t i f i c a t i o n Procedure has been followed.

2) Head the information gathering/transmitting e f f o r t s at the Houston Office.

A l l s p i l l s of O i l ano l i q u i c p o l l u t a n t s s^.al l :>e recorded anc repo r ted according t c t he f o l l ow ing p r o c e d u r e :

A. The F-.t-'.C Superv i so r be respons ib le f o r -

1. Reccd inc a l l such s p i l l s on the D a i l y Log or the Company Dai ly D r l l i n g Report ,»ne I ADC Tour Repor t , snowing the S p i l l Report ing Data l i s t t C on page 3 c f t h i s p l a n .

2 . Reportmc a l l sucf. s p f l i s o r a l l y to the appropr ia te U.S. Geologica l Survey D i s t - i c t O f f i c e (as l i s t e d of paoe 9) w i t h i n the f o l l o w i n g t ime l i m i t s :

a) Wi th in 12 h o u r s , i f 1*41 I f a r t 1.0 cubic meter b a r r e l s ) or l e s s .

b) Without d e l a y , i f s p i l l s are more than 1.0 cubic meter (6 .3 b a r r e l s ) .

3. Report ing a l l such s p i l l s o r a l l y to one o f the f o l l o w i n g ( i n order of p r i o r i t y ) :

a) Nat iona l Response Center (800) 424-8802 U. S. Coast Guard 400 Seventh S t r e e t . S. W. Washington, D. C. 20590

b) U. S. Coast Guard (504) 589-7171 Captain o f t h e Port (WP) 4640 Uquhart New O r l e a n s , LA. 70117

c) Envi ronmenta l P r o t e c t i o n Aoency f t M ) 767-2666 1201 Elm S t r e e t D a l l a s , Texas 75270

4 . Report ing a l l such s p i l l s o r a l l y to t he Area Super intendent or to the DnTTTng S u p e r i n t e n d e n t accord ing t o the N o t i f i c a t i o n Procedure found a t the beg inn ing o f t h i s p l a n .

5. N o t i f y i n g o t h e r companies of observed p o l l u t i o n r e s u l t i n g f rom t h e i r ope ra t i ons , as r e q u i r e d by O.C.S. Order No. 7, Pa rag raph '2 .3 .2 .

6 . The O i l S p i l l Response Coord inator s h a l l r e p o r t immediately a l l such s p i l l s or leakages t h a t a re i n any way r e l a t e d t o or suspected t o be r e l a t e d t o p i p e l i n e causes t o t he U.S. Geolog ica l Survey , P ipe l i ne Approval S e c t i o n , at (504) 837-4720; E x t . 257 , i n accordance w i t h Not ice To Lessees and Operators No. 80-9, dated Oc tober 06, 1980.

C. A l l o ra l r epo r t s t o t he above agencies s h a l l be conf i rmed i n w r i t i n g by the D r i l l i n g or P r o d u c t i o n Supe r i r t enden t , as requ i red by O.w S. Order No. 7, Paragraph 2. 3.

A T : A HMi : . : « . •

EQUIPMENT DEIAIL

7ne f o l l o w i n g i» « l i s t i n g o f equipment a v a i l a b l e , l o c a l l a * * • t e r s o r . r . e l r e q u i r e m e n t s . Mere d « t a . . e d i : . l c rmat icr . cr t h l f a: i o t h t l *• .Ten: i s a v a i l a b l e i n the Clean Gulf Assoc ia t e s Operations M u t u a l ,

This equipment includes .

A. Fas t Vcspcr.se Systems Model I ("Intracoastal C i t y , V e n i c e , Cameron, Panama C i t y , Braderton, Rockport and Galveston)

Detlcyser. t l ime

I hours

Model II Fast Response Units are available for storage at remote locations or for rental like the TWO

(Grand I s l e , Ven ice , I n t r a c o a s t a l C i t y , Cameron and Houma)

B. H i g h Volume Open Se* Skimmer Syster (HOSS Barge) a t Crand I s l e

t hours

C. S h a l l o w Water Skimmer Systems (Venice, Crand I s l e and Houma)

D. A u x i l i a r y Shallow Water Skimmers and Booms (Grand I s l e , Ven ice , I n t r a c o a s t a l C i t y and Calveston)

Rock; cr t

Immediate

Immediate

E. K e l l c c p t e r Spray System (HUSS U n i t i ) (Crand I s l e , Venice, I n t r a c o a s t a l C i t y , Rockport and Galves ton)

F. W a t e r f o w l R e h a b i l i t a t i o n U n i t and B i r d Scarers (Grand I s l e , Venice and I n t r a c o a s t a l C i t y ) (Waterfowl Unit a t Crand I s l e )

G. Misce l l aneous M a t e r i a l

I hour

1 hour

1 f o u r

H. R a d i o Systems (New Orleans)

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SONAT EXPI.OnAiiON COMPANY

NOTIFICATION PROCEDURE

PHOnUCTlON SUPERVISOR

OI'EHATION B A S g AMELIA S0*i/6 31-2171 o r INTRACOASTAL 3l0/093007'»

Dn.ILL.INC surEnvison

FRANKLIN OFfjCg 310/020-5051' or J. L. MARKEHSON 310/020-3065 or J. H. PDIDERGRASS 310/020-0190 or n. A. YOUNG 310/020-5036

HOUSTON PRODUCTION 7 1 3 / 9 I ' 0 - I « 0 0 0 ASST. mOD. SUP En I NT EH DENT n . A. LlNDrTRDT Home: 71 3/027-07 3'»

PRODUCTION SUPERINTENDENT AWP OIL SPILL RESPONSE COORDINATOR J . M. SIMPSON Hoac: 713/523-0230

CLEAN CULF ASSOCIATES 50'«/366-1735

- I GOVERNMENT ACEHCIES

MINERALS MANACfcJMENT SERVICE JOS/037-'i72O o r M c t n l r i e D i s t r i c t

lloumn D i s t r i c t L r . f o y e t t e D i s t r i c t Lnkc Char les D i s t r i c t F reepor t D l n t r l c t

and U.S . COAST GUAnP

Notlonol Rcoponsc Center flOO/'«2li-0002

5O'i/06O-«iO33 or 3l0/?32-6O37 or 3l0/'i70-6'iliO or ' • 09 /299 -10» i l

HOUSTON DRILLINC 713/9' '0- ' .0O0 DniLLINC SUPERINTENDENT M. J . SIMON Howe: 713/'« 37-27 3''

SR. V RESIDENT R. H. r . .

ALTERNATE H. I . SMITH

Home: 713/701-7520

Home: 713/'»37- ,»0O3

I PRESIDENT F. D. LEInn Home: 713/ ' '60-1076

ATTACmora 6f

SONAT OIL TRANSMISSION INC.

NOTIFICATION PnOCEDUTIE

PRODUCTION SUPERVISOR

1

OPERATION PASES 50'i /631-2171 or AMELIA

INTRACOASTAL 310/0930R7 1

FRANKLIN OFFICE 310/020-505' ' or J . L . MARKERSON 310/020-3065 or i . R. PENDERGRASS 310/02R-O19O o r n. A. YOUNG 310/C20-5016

• rrrPINTENPKNT M^ir.TQN PRODUCTION 71 l / ^O-^OOO ASStT PROD. H. A. LIN05TEOT

71 3/0?7-O7 3,«

PRODUCT ION SUPERINTEND FWT AND

OIL SPILL RESPONSE COORDINATOR

J . M SIMPSON I 'pnr; 71 V'?? 3-0? 30

I CUSA BAN Cifl.F ASSOCIATES 50<«/36'»-IJ V)

I

DRILLING SUPERVISOR

— r

C.nvERNMF.NT AGENCIES MI NERALS MA NAG EM ENT S ETW | C E

50X/037- '«720 01 M r t n i r i - P l s t r i c t l loiwn D i s t r i c t | * f * j N r f t i f D i s t r i c t ! « k r C h n r l r s D i s t r i c t F r e f p o r t P l n t r i r t .

ftM CT>AST GUARD N n t l r m s l Response C<?nt#T ROO/'i2 J«-R0O?

5nii/n60-'iO33 or 3lO/?3?-6037 or 3l0/l.70-6MiO or

1 O'I 1 HOUSTON DRILLING 713/9 , '0-»iOOO DRILLING SUPERINTENDENT

M. J . SIMON Home: 71 3/'« 37-27 3,«

VICE PRFSIDENT

R. H. KERR Worn*: 7 1 3 / 7 0 l - 7 5 2 3

Af,TERN ATE

f . O. LEIGH M M : !

7 1 3/'<6R-107r> j

ATI ACIWENT 6*

SPILL RESULTING FROM DRILL 1NG ITERATIONS

Personnel w i l l be u t i l i z e d es per Exh ib i t " F " .

D r i l l i n g operations w i l l cease pending a? prove", ' r e t nous tor..

The Area Superintendent i s tc be availafc'e a*, a Ctntra l 1 led "ocet ion. to coordinate e f f o r t s to control »nd/or recover i f U . He (Hf l Wt nar p la t form or recovery equipment.

Houston is to be kept aware of develcpmerts hour ly , cr es the., cccwr. Telephone No. : (713)940-4000

Base Operators (Dispatchers) are to inform boat crew tc Stand by for ins t ruc t ions . Air Log i s t i c s and PHI a r t to be n e t t e d also.

ATTACHMENT 6h

J

SPILL RESULTING FROM DRILLING OPERATIONS

1. The Company D r i l l i n g Supervisor w i l l lead operations t o COAtl r the s p i l l brought on by d r i l l i n g operat ions i f safely possible

2. Personnel from locations near to the d r i l l i n g operat ions w i l l be u t i l i z e d to operate the recovery equipment

3. A Product ion Supervisor se lected by the Area ' uperintendent w i l l supervise recovery operations

4. I f necessary, addit ional manpower would be drawn from a contract labor force or personnel on thei r " o f f " days

ATTACHMENT 61

N*0* Sf : SUNMCI LOCATION OCS -0 4760 W| Ll * I » I

4700

ATTACHMENT 10

COASTAL ZONE MANAGEMENT CONSISTENCY CERTIFICATION

Supplemental Plan o f E x p l o r a t i o n Type of Plan

West Cameron Block 247 Area ar.d Block

OCS 6 4760 Lease Number

The proposed a c t i v i t i e s desc r ibed i n d e t a i l i n t h i s p lan comply w i t h L o u i s i a n a ' s approved Coastal Management Program and w i l l be conducted in a manner consistent w i t h such a program.

SONAT EXPLORATION COMPANY Lessee or Operator

D. E. Richards Supervisor o f D r i l l i n g Engineering

Ju l y 24, 1985 bate

SEDRPO48520<21

SEAWATER GEL MUC

ATTACHMENT 11 TYPICAL MUD COMPOS 17!ONS

T h i s type mud is t y p i c a l l y used to d r i l l from the base of the conductor casing t o the surface casing p o i n t . Genera l ly , the seawater gal system w i l l be used f r o m l e s ' than 1000 f e e t t o a maximum of 4500 f e e t . Tne components used to make up and mainta in the requ i red c h a r a c t e r i s t i c s of t h i s mud system are :

Mud romponents 1 . D r i l l e d Sol i ds 2. Bentonitoe Clay 3 . Caustic - Sodium Hydroxide 4 . Mica Flakes

(Lost C i r c u l a t i o n M a t e r i a l ) 5 . Cel lu lose Polymer 6 . Seawater

LIGHTLY TREATED L1GN0SULF0NATE SEAWATER/FRESHWATEF 1 6,000-8,000 ppm Cl) MUD

As the hole is deepened below surface cas ing i t becomes necessary to s t a r t add ing add i t iona l m a t e r i a l s to mainta in the des i red mud c h a r a c t e r i s t i c s . S low ly f resh water i s s u b s t i t u t e d f o r sea water as tne depth and temperature i nc rease . A t y p i c a l I C . 0 - 1 0 . 5 pound per g a l l o n l i g h t l y t r ea ted l i g n o s u i f o n a t e system used to about 10,000 feet would i n c l u d e :

Mud Components 1 . D r i l l e d So l ids 2 . Benton i t ic Clay 3 . Bar i jm Su l fa te - We -n t Mater ia l 4 . Caustic Sodium Hydrux ide 5 . L ignosu i fonate 6 . L ign i te 7 . Cel lu lose Polymer 8 . Seawater/Freshwater

LIGNQSULFQNATE FRESHWATER (3.000-4,000 ppm Cl ) MUD

The deep por t ion o f a t y p i c a l wel l belov. approximately 10,000 f t would requ i re a freshwater l i g n o s u i f o n a t e mud system i n order io ma in ta in the mud p rope r t i es as desired for p roper ho le maintenance. A t y p i c a l 10.0 - 11.0 ppg l ignosu i fona te t r e a t e d mud system would i n c l u d e :

Mud Components 1 . D r i l l e d S c l i d s 2 . Benton i t ic 3 . Barium S u l f a t e - Weight Mater ie l 4 . Caustic Sodium Hydrox ide 5. L ignosu i fonate 6 . L i gn i t e 7. Defoamer/Detergents 8 . Freshwater

Lbs/Pbl of Mud 4TP50 30-ao

0.5 - 1.5 0.5 - 1.5

0.0 - 0.25 As requ i red • approx. 10*/ bbl s a l t from the seawater

Lbs/bbl o f Mud —5T70"

20-30 A5-60

1.0 - 2.0 A-6

0.0 - 3.0 CO - .25

As requ i red - approx. 5#/bbl s a l t frcm 50/50 seawater-f reshweter .

Lbs/bbl o f Mud eT̂ FC 20-30 55-150 1-2 4-e 3-8 0.5

As reau i red

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