in Reply Refer Tc: 3

Aauco Production Conpany Attention: Mr. Ralph .J. Giouerx Post Off fee Box 50879 Hew Orleans, Louisiana 70159

Gcntlmen;

RsrerenCc 1s aade to your In i t ia l Plan of F.xploratlnn received J>,-ne 19, 1935, for Lease OCS-G 7164, Block 766, Nubian? Island Arra. This plm .-.eludes the activi t ies pressed for Kelts A, <i, and C.

In accordance witn 30 CFP. 250.34, revised December 13, and our letter dated January 29, 1979, this plan has b*en determined ro be cceiplete as of July 3, 1985, and is now he leg considered for approval.

Your plan control nuaber fs H-21C1 ani should oe referenced \ n your c sewn ica­tion and correspondence concernino this plan.

Sincerely yours,

& ORIG. SGD.) RALPH J. MELANCON

U. y. Sclanas i*'t*g 1 onal Sup»; rv i so r Rules and Production

hec: Lease OCS-C 7164 (OPS-3-2) (FILL ROOM) (J)tS^Z=A^2v^ic_lr>fo> Copy of the plan (PUBLIC RECORDS ROOM)

On-3 DO-7

MOTol bert: gcw: 6/25/85 Uf sk 3a

0«!ce ef Program, vices

IUI 9 1385

PUBLIC INFORMATION COPY

Amoco Production Company New Orleans Region Amoco Building Post Office Bo* 50879 New Orleans. Louisiana 70150 Of<S*ior«f Division

June 18, 1985

F i l e : RAF-LF

JUN J y

Minerals Hanagement Service r

Rules and Production ' -^r,^ P. 0. Box 7944 Metairie, LA 70010

Attention: Mr. D. W. Solanas Regional Supervisor

Plan of Exploration Mustang Island 766 OCS-G-7164 Offshore Texas

In accordance with 30 CFR 250.34-1, Exploration Plan, revised September 14, 1979, and letter dated January 29, 1979, attached please find eight copies of Amoco Production Company's Plan of Exploration for Mustang Island Block 766, Offshore Texas.

Amoco respectfully requests your favorable attention to this matter. Should further information be desired, please contact Harty Van of this office telephone 504/586-6567.

Yours sincerely,

HCV

Attachments

PLAN OF EXPLORATION

MUSTANG ISLAND 766

OCS-G-7164

OFFSHORE, TEXAS

AMOCO PRODUCTION COMPANY NEV ORLEANS, LOUISIANA

JUNE, 1985

PUBLIC INFORMATION COPY

250.34-1 EXPLORATION PLAN June 18, 1965

A BRIEF DESCRIPTION OF THF PROPOSED TYPE AND SEQUENCE OF EXPLORATION ACTIVITIES TO BE UNDERTAKEN TOGETHER WITH A TENTATIVE TIMETABLE FOR THEIR PERFORMANCE INCLUDING PLAN COMMENCEMENT DATE, SEQUENCE EACH WELL IS TO BE DRILLED, TIME FRAME (DAYS) TO COMPLETE EACH WELL, AND TOTAL TIME TO COMPLETE THE PROPOSED PROJECT.

Amoco Production Company, 50», Elf Aquitaine, Inc., 20*, BelNorth Petro­leum Corporation 20* and Total Petroleum, Inc., 10?o acquired Mustang Islanr' Block 766 in the July, 1984 Federal Offshore Lease ^ale No. 84 for S1.725 MM.

Mustang Island Block 766 is located in 200-120 fect cf vater, approxi­mately 20 miles offshore and southeast of the Nueces County, Texas shoreline. (See Attachment No. 1, Location Map)

Amoco's exploratory plan entails r* r i l l i n g three wells from a jack-up r i g - A l l three wells (A, B&C) w i l l be directionally d r i l l e d from the same surface locatior. The proposed locations of these wells are as follows:

A. Surface: 6,850' FWL & 5,300' FNL

B. Surface: 6,850* FWL & 5,300' FNL .

C. Surface: 6,850' FWL & 5,300* FNL

D r i l l i n g of the f i r s t well w i l l commence on September 1, 1985 with d r i l l i n g of the remaining wells to end on approximately February 20, 1986. Total tiae to complete thv project w i l l be approximately 170 days. See Attachment No. 2 for the Timing Schedule on the d r i l l i n g of the three wells.

A DESCRIPTION OF THE DRILLING VESSEL(S), OR OTHER INSTALLATION(S) OR DEVICE(S) TO BE PERMANENTLY OR TEMPORARILY ATTACHED TO THE SEABED INDI­CATING THE IMPORTANT FEATURES THEREOF WITH SPECIAL ATTENTION TO SAFETY FEATURES AND POLLUTION PREVENTION AND CONTROL FEATURES INCLUDING OIL SPILL CONTAINMENT AND CLEANUP PLANS.

The actual r i g to Le used w i l l probably be the jack-up r i g Rowan Louisi­ana. The r i g is equipped with a l l safety and pollution-prevention equipment required by the OCS Orders. See Attachraent No. 3 for r i g details. See Attachment No. 4 for Air Quality Data.

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A l l operations are covered by Amoco's Oil S p i l l Contingency Plan previously approved by the MMS on August 10, 1984.

GEOLOGICAL AND GEOPHYSICAL SURVEY RESULTS IDENTIFYING GEOLOGICAL HAZARDS AND/OR SUSPECTED ARCHAEOLOGICAL ANOMALIES RELATIVE TO PROPOSED VELL(S), A MAP IDENTIFYING ANY SUSPECTED ARCHAEOLOGICAL ANOMALIES RELATIVE TO PROPOSED WELL(S) WHERE AN ARCHAEOLOGICAL SURVEY IS REQUIRED, AND A DES­CRIPTION OF SURVEY EQUIPMENT UTILIZED.

The attached Shallow Hazard Report (Attachment No. 5) confirms that the proposed well locations are free of surface f a u l t s , seafloor anomalies, and gas accumulations.

In accordance with the lease agreement, an archeological survey was per­formed between October 28 and November 4, 1984, by Comap Geosurveys, Inc., on board the M/V "Coral Seal". According to Mr. Jack C. Hudson, Marine Survey Archeologist, "No evidence of l i k e l y locations fnr such sites was seen in the subbottom p r o f i l e r records, and no areas are recommended for avoidance on the grounds of possible prehistoric occupa­t i o n . " See Attachment No. 6 for the complete Geohazard and Archeologi­cal Survey of the Block.

In accordance with NTL 83-3, par. II.A.5, a copy of the high-resolution survey data from the two lines closest to the proposed well was for­warded directly to the Lake Jackson, Texas Minerals Management Service D i s t r i c t on June 17, 1985.

A LOCATION MAP OF THE LEASE BLOCK(S) RELATIVE TO THE SHORELINE, INCLUD-ING A DESCRIPTION OF ONSHORE SUPPORT BASE FACILITIES, A LOCATION MAP SHOWING EACH PROPOSED WELL, INCLUDING SURFACE AND PROJECTED BOTTOM-HOLE LOCATION, WATER DEPTH (BATHYMETRY), PROPOSED TRUE VERTICAL AND MEASURED DEPTH OF EACH WELL.

Please reference Attachment No. 1, Location Map. This map shows the relationship of Block 766 Mustang Island area, to the shoreline as well as the proposed surface locations of the wells.

Operations w i l l be conducted out of Brown & Root's dock f a c i l i t y at Har­bor, Island near Aransas Pass, Texas. The base is equipped with both a heliport and boat handling f a c i l i t i e s .

CURRENT STRUCTURE MAPS AND, AS APPROPRIATE, SCHEMATIC CROSS SECTIONS SHOWING EXPECTED DEPTH OR MARKER FORMATIONS.

NOTE: Amoco Production Corapany believes a l l geologic information sub­raitted under this section to be exempt from disclosure under the Freedom of Information Act and i t s implementing regulations.

3-

Attachraent Nos. 7 & 6 are Structure Maps demonstrating structural relationships. Attachment No. 9 is a Scheraatic Cross-Section showing the geologic setting of the prospect and depicting structural relation­ships as determined by interpretation of proprietary data.

A BRIEF DESCRIPTION OF PROCEDURES, PERSONNEL, AND EQUIPMENT USED IN YOUR OIL SPILL CONTINGENCY PLAN THAT ARE TO BE USED FOR PREVENTING, REPORT­ING, AND CLEANING UP A POLLUTION SPILL, INCLUDING EQUIPMENT LOCATION AND TRAVEL AND DEPLOYMENT TIME.

In addition to those systems commonly u t i l i z e d by industry to prevent p o l l u t i o n , Amoco is a member of Clean Gulf Associates which is a combine of companies formed to clean up o i l s p i l l s i f such occur. Existing o i l s p i l l cleanup equipment with beach protection and bird-cleaning stations can be on hand within 2 1/2 hours in the event of a s p i l l . This equip­ment i s maintained on standby and in a ready state at locations such as Venice, Louisiana; Grand I s l e , Louisiana; Houma, Louisiana; Intracoastal City, Louisiana; Cameron, Louisiana; Galveston (Texas Ci t y ) , Texas; and Port Aransas (Fulton), Texas.

A l l applicable safety and pollution standards of the MMS, USCG, OSHA, and the EPA w i l l be complied with. A l l personnel w i l l be trained in the proper maintenance of existing equipment and w i l l participate in d r i l l s and inspections designed to enhance their a b i l i t y to u t i l i z e the equip­ment to i t s fullest extent and ensure as safe an operation as possible.

A DETAILED LIST OF MUD COMPONENTS AND ADDITIVES, INCLUDING THE COMMON OR CHEMICAL TRADE NAME OF EACH.

Coraponents of the d r i l l i n g mud may include any or a l l of the following: b a r i t e , gel, caustic, soda, chrome lignosulfonate, l i g n i t e , sapp, alumi­num stearate, soda ash. phosphate, gilsonite, surfactant (methanol). Quick Seal, Spotty and CMC. No bactericides containing halogenated phe­nols w i l l be used in the raud system. Any d r i l l i n g raud, d r i l l cuttings, sand, or other solids w i l l not be disposed of into the Gulf unless a l l of the free o i l has been removed.

-4

WELL SURFACE LOCATION

A 6850' FWL 5300' FNL

B 6850' FWL 5300' FNL

C 6850' FWL 5300' FNL

SCALE: r -2000 '

ATTACHMENT #1

Amoco Production Company NEW ORLEANS REGION

BLOCK:MUSTANG ISLAND 766 OCS-G-7164

LOCATION MAP

\ 1985 1986

d CO -> i

LL

Mar

.

Apr.

May

Uune

"~> CT

< Sept

*-o O N

ov.

|Dec

. d CO

~i

X) 0)

Li-CO a

< May

Uune

3 < S

ept.

O

O

> o z

[De

c.

70 Da ys

: 5D ays C I ST/ i

i 5 Days B

Se ptembei I

1, I 1

198 1 5 I

i 1 A L —

T DTA 1

L TIME 170 DA L _ l

vs

ATTACHMENT # 2

Amoco Production Company NEW ORLEANS REGION

Timing Schedule

BLOCK: MUSTANG ISL 766 OCS-G-7164

QUARTERS: Three level wilh accommodations for 78 men including S man hospital room, dual gallay. dining and recreenon tacilittaa. Year round t i r * conditioning Top mounted barge control ho uaa wrth internal dnd external access 3 3 i

WELL POSITIONS

+ • • » rr * rr

TV

4 • • *

1 — Jl—ej

CONTROL HOUSE

THIRD LEVEL

SECOND LEVEL r l -

FIR9T LEVEL

HULL STORAGE CAPACITIES: Drill water SOOO bbl Diesel Fuel (Dnllmg) 1000 bbl Diesel Fuel (Transit) 3400 bbl Potablt Watar 740 bbl. Drill Pipe. Caaing 600 tona TOTAL VARIABLE LOAD (approx,) 1500 tons

ROWAN COMPANIES, INC. 1900 Post Oak Tower 5051 Westheimer Houston, Texas 77027 713/C21-7800 CABLE ROWCO. TELEX: 775230

Rowan Companies, Inc. was ounded in 1923 as Rowan Drilling Ccmpany and for more than 51 ears has built an outstanding eputation for efficient professional /peraiions onshore and offshore, 'hrough the years, Rowan has •uilt an extremely strong manage­nent and operation teams to con-•tract, equip and operate some if the most advanced and efficient Irilling platforms in the industry.

The Rowan organization is now vorking in the offshore regions of he U. S. Gulf Coast, Latin America, he Middle East, Southeast Asia ind the North Sea. Land dr i l l ing ' , ' , " . i ctivities are currently hi process 'rA:%\\ hroughout the United States *fet?V*$&

f r ' r-:

nrPE: .eTourneau self-elevating mobile )ffshore platform, ABS approved, or exploration and development Jrilling. The principal dimensions ire 247' long x 200' wide x 26' deep .•. iull with three 410' legs and a & wide x 4V long drilling slot. . • • .

DESIGN CRITERIA^; H-H' "•"V- ~ .*'..*.*••!'""'•* vr'-'i • '"

rhe unit has the capacity to oper- \'-. ^ ite in water depths from 35'.to 350'- • n wind speeds to 120 MPH with a.'*: ange ot allowable wave forces to •'• . j maximum height up to 50V., •> - r

:

rough to 'crest. . * / . r * . < -': The platform is designed for a : - x 3,000,000 pound fixed and variable load plus^a 1 ,250.000 'p^nd.der r lck^ Dull-lri; Its'elevating speed \ i " 50 ft.'hour. "

^ozzIe,Th"ruslers capable'of.deliv-£-\. jring a total bollard pu\[ of 82,500 v . \% sounds,* each unit driven by*; '- . i 'J.- '- . . 3eneral Electric Model 752 ttotorTi^ System is designed for a 5 knot fac-*: advance speed under t o w J ; . * ^ ; . ^ ' ^ ; :

DERRICK, : SUBSTR^C^V TURE AND SUBBASE:^; ' J e C: Moore 147.'. x 3ax'30^holted,. ' ty r-leg, dynamic" derrick; designed for rr-: l,000,000# hook load. Derrick'V;* - f ncludes"National 760F. crown jfocfc, adjustable casjngstabbin'g v'. j r . jlatfo'rm, and vapor proo'f lighting: v>?

.eTourneau substructure and sub->ase,\19' high, allows"a '1,250,0002 \ j g otal load: 950.000? hbo"kJoadrand-v ftmuUanebu's 350,000*, setback- r.v'CV-•qre"an3aftmovement^of subbase,',!, '"'. ind transVe/se .movement -g fsub^ \ ;tructute"finable relocatirio of rotary'

DRAWWORKS: National 1625-DE grooved for W iine with dual, integral GE 752 motors, 7838 Eddy Current Brake, Micromatic drilling control, Crown-o-Matic, over-running clutch, and sand reel with 18.000 ft. of 9/16" wire line.

ENGINES AND DRIVE: 4-Caterpi'lar D-399 TAC engine rated at 1300 HP each with GE 930 KW AC Generators. A separate

. Ca t D-334 engine with a GE 150 KW ^>AC Generator for auxiliary power. ^ -

A Baylor*FX''4 Thyrig SCR f u t i V - ^ j '(^control power system, LeTourneauyn .^P;AC Jacking*panel (the SCR^ys tem^- 1

53V- provides power for dril l ing vand - thruster operation.'the AC system \

provides power for ships service "X and LeTourneau elevating units).

TRAVELING EQUIPMENT: A National 660-H-500 Traveling . . Block grooved for 1\4" line. ••. National H-500 hook complete with hydraulic snubber and rotation lock. -National P-650 swivel. V^^&vf'*' ;\

IS*

ROTABY:^ National^375,0-300 RPM, 3.60 ; V \

' gear ratio Varco type master.s'i/:.' • 'v,-'-bushing, Varco Model 10 alr£.&*£ powered drill pipe snps. ^ '.?-^r~-rf

•g MUD] SYSTEM VAN D^4'*¥^^

2'"0 bbl. combination shale shaker, • ' degasser. desander, and desilter , tank on ma'n deck.

1— Martin & DecKer pit volume totalizer, flowfill system, and pump stroke tachometer (Main readout ond recorder on drill

^ floor with remote recorders in £ quarters office).

2— 5-9/16" OD schedule 160 stand-pipe with 10.000- rotary hoses.

4—Howco 1360 cu. ft. pneumatic type bulk mud storage tanks.

1—70 cu. f t non-pressurized surge tank. _ .•..v."-.'.'-^.'.

.1—350o'cu. "ft. sack storage" area

CEMENTING EQUIPMENT 1—Howco Twin HT-400 Cementing

& Fracturing Unii wiih 2—«V 71 Detroit Diesel engines (torque converter equipped), 2—10 bbl.

. . displacement tanks.^\'^v; .. v 1—60J4P; recirculating mixer, i./ ' 4 -^owco~i360.Vuj l t pneumatic

:-5» r"v bulk cement storage tanks.*^.; • 1 -^owcb'220 'cu. ' f t pressurized *

' surge to^^$3^y'j£%~.: ' y 2-r-Howco ACL compressors, j 75

> cfm. each, 2-30 HP.TEFC motors •; -' t;- " -. —;:.*uJo;rxa»> - . • « i - . . 2—^Quincy 50 HP.compressors.

A^-Qwricy 5 HRdTesel"and electric ; ' ' r J u - . operated coldjstart compressor. < • 2^pistiUatio'n unit's^Triton FWB-200 ^ ^ 2 5 0 0 g a l g ^ & o ^ e ^ ^ i ^«1-T7RF^500 sewage treatment un i t 'r"z 2rr10,ndo #.i5ncKbrs and L**»fourneai!

feSi-rr13%v; b'lowotlt p'revehter stack -<^j6^Air ^o\s\C€^i%^i^::\-

I—Set communication equipment •V " i^-Set safety equipment (life' :.b?' i . ;.:^: r a f t s , ' e t c . J ' ^ o . ^ ^ t%$S&Y:

i^Koqhiey" accurnuiator system."' 1—National wireline anchor."?'-V

Vrt ;505f.iVesfhe/mef^ £ v Pquston, Texas 77027.^jj* ' f v j .

713/621-7800 CABLE:-ab. vco.

Plan of Exploration for Mustang Island BLock 766 OCS-G-7164

Air Quality

This attachment includes the inforination required und.t ju Part 250.57(a), to make the necessary findings under that s- .ion.

Exemption Formula

The distance of the proposed f a c i l i t y from the closest onshore area of a state is 18 statute miles:

The proposed f a c i l i t y is at: latitude 27° 41' 31.87" north, and longitude 96° 46' 2.82" west.

The closest onshore area of a state is in Nueces county, Texas, at:

latitvde 27° 49' 45.11" north, and longitude 97° 2* 5.55" west.

This produces the exemption amount of 599 tons/year for particulates, sulfur dioxide, nitrogen oxides and volatile organic compounds, and the emption amount of 23,352 tons/year for carbon monoxide.

Proiected Emissions

Dri l l i n g

The wells proposed to be drilled on t h i * plan are as follows:

Proposed Well Proposed Measured Depth (Feet) Rig Type

CCS-G-7164 A Jack-up 0CS-G-7164 B Jack-up 0CS-G-7164 C Jack-up Total Feet Drilled 37,900

ATTACHMENT NO. ±

Assuming Ui.- rate of d r i l l i n g w i l l be constant, the total feat drilled during each year of the plan are as follows:

."85 27,199 feet '986 -.0,701 feet

Assuming 60 horsepower hours inquired to d r i l l one foot* on a»> offshore o i l and gas d r i l l * ; . • r i g , this plan w i l l reouire 1,621 940 horsepower hours to complete the 1965 portion. The duration of the operations is 122 days. Using the emission factors for diesel powered industrial equipment from Table 3.3.3-3 cf KPA publication AP-42, Compilation of Air Pollutant Emission 7a» tors , the following total emissions are expected '".om +hi& r ian:

Carbon Nitrogen Sulfur Monoxide Oxide Hydrocarbon.. Dioxide Particulates

Drilling 5.45 25.18 2.0. 1.67 1.80 Rig

Ve estimate to have two helicopter i miing-takeoff cycles each da,, at the d r i l i i n g location fo r the 122 day period of d r i l l i n g a c t i v i t y . The emission factors por landing-takeoff cycle fo r helicopters from Table 3.2.1-3 of EPA Publication aP-42 produce the fo l lowing helicopter emissions in tona: 6

Helicopters 0.70 0.07 0 06 0.02 COS

We plan one 2,000 horsepower workbo-tt landing wi th six hour? of i d l i n g three times each week at the d r i l l i n g . l o c a t i o n The f u e l consumption while i d l i ng at the d r i l l i n g location is seven gallons per hour. The emission factors (7 gallons/hour x 6 hours/landing x 3 landing/week x 18 weeks of d r i l l i n g = 2,268 gallon*) for CO, VCC and NOx from diesel vessel emission factors by opera.ing mode, Table 3.2.3-3, and th* ,'.:ctors fo r *0 2 and particulates f ro r

Table 3.3.3-1 produc ••'ie foi iowing workboat emissions, i n tons, f t the d r i l l i n g location:

Workboats 0.33 0.28 0.11 0.04 0.04

Subtotal 6.48 25.53 2.18 1.73 1.87

These emissions are planned to occur i i 1985.

^Atmospheric emissions from ofi.-i.tore o i ' and i.as developxfpt and production (EPA 450/3-77-026, p. 82-83, June 1977).

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I n 1986, we plsn to a r i l l 10,701 feet The emissions from the 1986 d r i l l i n g operat icn- ,\>t as fol lows:

Emissions in tons year

Carbon Monoxide

Nitrogen Oxide Hydrocarbons

Sulfur Dioxide Particulates

D r i l l i n g 2.14 9.9* 0.79 0.66 0.71

Helicopters 0.27 0.03 i .02 0.02 0.02

Workboats 0.13 0.11 J -04 0.01 a. fri

Subtotal 2.54 10.05 0.85 0.68 0.7'J

These tinissions are planned to occur in 1986.

The annual emission t o t a l s , in ton'., are as follows:

1965 D r i l l i n g 6.46 2.18 1.73 1.87

I _ D r i l l i n g 2.54 0.65 0.68 0.73

Therefore, since nr ie of these amounts approach 599 tons 123,352 tons for ctrbon monoxide), we request that y m determKt under Section 250.57(d) that t h i s plan b-j exempt fr^m fur ther a i r qual i ty review.

-3

Amoco Production Company New Orlesns Region Amoco Building Post Office Box 50879 New 0'ieans. Louisiana 7Q150

June 10, 1985

Minerals Management Service Depi—y Minerals rk<n«g*& Ofx'Kor.t Oper;itiorr Support P. t . Box 7944 lit t a - r i e , LA 70010

Subject: Shallow Hazard Report Plan of Exploration Mustang Is land Block 766 (OCS-G-7164)

A mv It i-sensor, h igh-resolut ion geophysical sun«sy was c i due ted over the en t i r e block *he results ind cat e a :mooth seafloor, .no surface fruits, seafloor snor i l i es , or shallow gas accumulations at the fo l lowing sur ta»n locations:

A. 6,850' s -1. . S.i iO* ~V!L B. 6,650' r.7., > , j 0 i ' FKL C. 6,850' FWL, 5,3c-1 FNL

Cor. vent ional CD? and "bright-spov" data, wi th associated ve loc i ty analyses, indicate these- i o ^ t i o n s are safe.

The nearest subsurface geologic conc .v is the Arco / / I w«ll on Modr fBO Approximately 3.8 miles south of the "A" snrfv;e Tot.ation. This w e l l was safely d r i l l e d and a sin.liar geol o g i ; sequence i s expected at proposed locations i n B>. ic*. 766.

Sincerely yours.

Divis ion Operations Geophysicist Offshore Texas Div i s ion

ATTACHMENT NO.