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Ate vi-.tens * 'r . Car* -or Mr. 9401 South^'St FrooMayt S*mo JJJUfl Hou»txm« Toxos 7TG74
Waranc* Is ta your Swlwai*?*! PI* • ^ ^ ' ^ T ^ \ T U ^ ••'
t?;a act *.v i t *«»••> proposed f&r - v i i ' .
tv no* being cnnviUftrOd for c ; r v v * ' .
Your | ,Uf. cen t re , iv ;-,"'<.2 Srt* i i m \ f - r e f f n In your c o « ^ n i -cavivir. ami ct.rr';:.j,on<itMC*- ,v.n-.:. r r • U M . j l*B*
M X : Loast OCS-G !'. ' <0PS-3-?) tFIL?:
bftfii 1 iar.ison:^:03/07/f.r.:^,w>-aca;.
SOHIO] SOHIO PETROLEUM COMPANY
CONTINENTAL & O F F S H O B E DIVISION
Hr. D. J . Bourgeois Minerals Management Service 1201 Elrvood Park Blvd. New Or ^ns. LA 70123-2394
February 22, 1988
940' SOUTHWEST FHEEWAV SUITE «12O0
HOUSTON -EXAS 77074 -M3-M--11SO
PUBUC IKFC.wV.AflOII—
Re: Supnlemental Plan of Exploration Ship Shoal Bloclc 368 OCS-G-5590, Well "G" Offshore Louisiana
Dear Mr. Bourgeois:
Enclosed are five (5) Confidential and six (6) Public Information copies of the Supplemental Plan of Exploration (POE) for the above referenced project. Accompanying this POE are one (1) set of processed seismic line data offsetting this location. Two (2) copies of the Hazard Study for Ship Shoal Block 368 were previously submitted with the i n i t i a l POE on May 22. 1986.
I * you have questions or require additional information, please call Cynthia Arnold at 713/778-6417. —
Sincerely,
Cary w/ Kerlin Offshore Business Unit Regulatory Supervisor
CLA/brg Attachments
SUPPLEMENTAL PLAN OF EXPLORATION
OCS-G-5590
SHIP SHOAL BLOCK 368
OFFSHORE LOUISIANA
February 22. 1988
LIST Of ATTACHMENTS
A. Letter from Sohio Regional Geophysicist
B. Vicinitv & Well Location Plats
C. Structure Map & Geologic Cross Section
0. Orilling Mud Components
E. Air Quality Review
SUPPLEMENTAL PLAN OF EXPLORATION SHIP SHOAL BLOCK 368
OC5-G-5590 OFFSHORE LOUISIANA
Pursuant to the requirements of 30 CFR 250.23.1, Sohio Petroleum Company
submits the following Supplemental Plan of Exploration (POE) for Ship Shoal
Bloclc 368.
(i ) EXPLORATION ACTIVITY
The proposed exploration activity for the subject tract consists of d r i l l
ing Well "G", in addition to the six (6) wells covered in the in i t i a l POE.
The r6" location w i l l be drilled as a straight hole. The estimated time to
dr i l l this one (I) exploratory well is about forty-five (45) days, with a June
I , 1988 anticipated spudding date for this location.
( i i ) PROPOSED ORILLING RIG
Sohio presently has under contract the SEOCO 706 semi-submersible drilling
rig, which w i l l be used for this project. This rig is capable of drilling to
25,000' in water depths of 2.000'. Specifications and drawing of this rig's
diverter and BOP system have been sent to your office on May 22. 1986 with the
initial POE.
( i i i ) GEOPHYSICAL WORK
All of the geophysical work preparatory to initiation of exploratory opera
tions has been completed. A velocity survey may be run on these wells when
total depth has been reached. No other geophysical work is planned unless
data obtained from drilling operations necessitates additional definition
detail from conventional reflection ssismic methods.
Supplemental Plan of Exploration Ship Shoal Block 368 Page 2
A shallow hazard report entitled "Hazard Study Blocks 360 and 368, Ship
Shoal Area" was prepared by John Chance & Associates, Inc. and two (2) copies
were previously submitted with the i n i t i a l POE on May 22, 1986.
The Ship Shoal Hazard Study has been reviewed by Mr. Jack Golden, Sohio's
Regional Geophysicist. Attachment A is a letter from Mr. Golden in which he
agrees with John Chance's conclusions and addresses shallow hazards at the "G"
well site in Ship Shoal Block 368.
(Iv) VICINITY AND LOCATION MAPS
Attachment 8 is a vicinity map depicting the subject tract's position rela
tive to the Louisiana shoreline. No new onshore facilities will be required
for d r i l l i n g the proposed exploratory well. Existing service company f a c i l i
ties in the Fourchon Area have sufficient capacity to accommodate this project
without modification or expansion.
Attachment B-2 shows the proposed surface location for Well "G" which will
be drilled as a straight hole. The water depth and surface loca
tion for this well 1s as follows:
Well "G"
Water Depth: 468' Surface Location: 6,500' FNL
550' FEL
(v) STRUCTURE MAPS AND CROSS SECTIONS
Structure maps and cross-sections are included in the five (5) confidential
copies of this Plan as Attachment C. Oepths shown on cross-sections and
structure maps are sub-sea measurements.
Supplemental Plan of Exploration Ship Shoal Block 368 Page 3
(vi) OTHER RELEVANT DATA
(A) 0J_J.Spi 11 Contingency Plan
Sohio Petroleum Company is a member of Clean Gulf Associates (CGA) and
would utilize that organization's equipment to clean up an oil s p i l l .
The closest CGA bases are at Fourchon, Grand Isle and Houma, Louisi
ana, respectively. Response times for CGA Fast Response Units from
these locations, would be 12, 13 and 13 hours respectively. Manpower
to operate the r >'•» equipment would be provided by Peterson Maritime,
Services. Inc., <jse personnel are trained for oil spill clean up
operations. Sohio's supervisory personnel would direct the clean up
operations until successfully completed. Additional details can be
found in Sohio's 1987 011 Spill Contingency Plan which has been
approved by the Minerals Management Service.
(B) List of Mud Components
Attachment D is a list of the proposed dr i l l i n g mud components and
additives, including the common and chemical trade name ot each addi
tive.
(C) Gaseous Emissions
Exploratory drilling operations will be conducted from the surface
sites described in Section (iv) using the mobile dr i l l i n g unit des
cribed in Section ( i i ) . Operations will be of a maximum duration of
forty-five (45) days.
Supplemental Plan of Explorat ion Ship Shoal Block 368 Page 4
At the d r i l l s i t e , gaseous emissions w i l l be generated by the r i g en
g i n e s , the attendant work boa t , stand-by boat , crew boat , and h e l i c o p
t e r , and the product ion t e s t i n g of possib le p rospect ive r e s e r v o i r s .
Gaseous emissions at the dock s i t e in Fourchon, Lou is iana, w i l l be
generated by the work boat , crew boat and h e l i c o p t e r . Onshore sLaging
f o r t h i s operat ion w i l l be from e x i s t i n g f a c i l i t i e s , so there w i l l be no
s i g n i f i c a n t Increase in emissions fo r t h i s a c t i v i t y . Projected emis
sions f rom th i s a c t i v i t y have been ca lcu la ted and are presented i n
Attachment E e n t i t l e d "A1r Ou ! i t y Review".
(D) Coasta J Zone Hanagemen t_ (C ZM)_ Con s is tency C e r t i f i c a t i on
An Environmental Report and Consistency C e r t i f i c a t i o n was included in
the i n i t i a l POE. Proposed a c t i v i t i e s described in t h i s Supplemental POE
w i l l a l so be conducted in a manner cons is tent w i t h Lou is iana 's approved
CZM programs.
STANDARD OIL PRODUCTION COMPANY
Sice Clearance Le t te r Ship Shoal 368 (OCS-G-5590) DATE: January 15, 1988
Offshore Business Development Un i t Geophvsicists conclude that no s i g n i f i c a n t shallow d r i l l i n g hazards e x i s t w i t h i n 500' of the Ship Shoal 368 supplemented "G" we l l l o c a t i o n (6500' FNL, 550' FEL; W.D. = 4 6 8 ' ) .
The o r i g i n a l records and summary repor t of a shallow hazard survey conducted by John E. Chance and Associates f o r Standard O i l Production Company over Ship Shoal 368 have been reviewed. We are i n agreement w i t h t he i r f i n d i n g s and conclude t h a t :
1) No obs t ruc t ions are observed on the sea f l o o r w i t h i n 500 f ee t of the proposed l o c a t i o n . The sea f l o o r dips south at a ra te of 25 f e e t per mi le .
2) Seismic data at the proposed l o c a t i o n Ind ica t e a t h i c k sequence of s u b - p a r a l l e l bedded sediments (over 1,500 f e e t ) tha t d ip to the southeast. The ra te o f d ip on the hazard s t r uc tu r e map i s 265 f e e t per mi le .
3) No gas accumulations or f a u l t s are observed at the proposed w e l l l o c a t i o n w i t h i n the upper 1,000 f ee t below mudline (1,468 f e e t below sea l e v e l ) .
Attachments include annotated copies of the p inger , d i g i t a l minisleeve exploder, s ide scan sonar and magnetometer records f o r l i n e s 13, 34 and 35.
Approved b y : '- ' •'<• A < I t*. • / G. M. Nichols
Concurred: M. F. Smith
Prepared by: ^ : A ?_ k \ { L ^ t V u [ Q C 7 / Oldroyd/W. Keach
ATTACHMENT A
368 O C S - G - 5 5 9 0
o o o
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a,9oo' 5 . 2 5 0 -
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I S O
5 5 0*
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!F» SL 1 J ? 0 0 '
ATTACHMENT B S C * t C l.OOO"
B L O C K 3 6 8 S N I P S M O A L A « C *
* R O F O S £ 0 WCI.L LOCATIONS
c « y. S C A B S
7!—
S./.KS 'L PRODUCTION COMPANY
ORILLIWG MUD COMPONENTS
Products of Oresser-Magcobar O r i l l i n g F lu ids S t r v l c t s a r t l i s t e d 1n tn1s program f« i l l u s t r a t i o n purposes. Equiva lent or comparable products are a v a i l a b l e from oth« s e r v i c e companies sucn as IMCO Serv ices. M l l p a r k . and N . L . Baro id .
Trade Name
Magcogel
Caust ic
Lime
Rapid Mud
"*gCGnOl
Magcobar
K-17
Spersene
Orispac
Bicarb
KXP-20
KOH
ES-B28-M
XC-Polymer
Composition Purpose
Wyoming Bentonlte; A naturally Provide good filter cake occurring element containing plates quality, filtrate control. of Silica and Alumina (Inert).
Sodium Hydroxide
Calcium Hydroxide
High Molecular We1g< . Anionic Liquid Polymer
2-ethy1hexano1, 2-etby1hexy1 alcohol
Barite: BaSO*
Potassium Lignite
Chrome-L1gnosu1fonate
Polyanionic Cellulose
Sodium Bicarbonate (Na HC03)
Potassium Chrome Lignite
Potassium Hydroxide
Proprietary Guar Gum based polymer
Xanthan gum
& viscosifier for water base drilling fluid.
Alkalinity Control
Alkalinity Control
Viscosifier. imparts shale stabilization
Oefoamor
Weighting Agent
Thinner, fluid loss : 1t1vo, potassium source
01soer;ant, fluid loss contral
Fluid loss control and viscosifier
Treating out cement
Thinner. Inhibitor, fluid loss additive, and potassii source
Alkalinity source and potassium source
Shale encapsulator
Viscosifier and fluid loss additive.
ATTACHMENT D
Air Quality F.evi >-For
Ship Shoal Arec 8'ocr 3& 0CS-6-f.o9C
Cohlo Petroeum Company 9401 Southwest Freeway
Hcusto... l : a', 77074
Submitted to Cary W. Ker l l r
Regulatory Supervisor
Feb jr*- }.% i :-St>
Prepared by John E. Chanc? 4 Associates, Inc.
Regulatory A Environmental r v ls lcn Project No. 88-8023
John £'. (Jhs ice A Assoc.. Inc. -ATTACHMENT E
Projected Emissions Srheduie for Project
t . General Infor at'en
Lecatlon of FACT!I ty - Shfp Shoal rea Block 368 of Rig/Platform - Semi-subrw.-rsinle
t»*ner/Operator - So'ilo Petroleum Cc c-ny C401 Southwes'.. rreeway Suite 1200 Houston, Texas ~70 4
Contac' 'v 'zzn - Cary H. Kerl ln Regulatory Superviser
Troje A H a r t Dtts - June '., 1988 Projei t End Date - July 15, I53f»
7,800 Feet to Ke Dr i l led 73 Mles Ott-hore
I I . Total Emissions for f i r m i n g
Tola! Time for D r i l l i ng 1 we l l : 2 months
Projected Emissions (Tons/honth of Dr i l l i ng )
Emitted Suhsur.ce CO S02 N0X VOC TSP
D r i l l i n g Operations 4.36 0 22.66 1.43 0.32
A. Transportation Emissions, 0 i ' i l ing
Projecte- isslons (Tons/Month ot Dr i l l i ng)
Emitted Subi'.ance CO SO, N0V VOC TSP
Crewboat 1.30 * 9.10 0.49
Supply Boat 0.03 0.03 0.17 0.02 *
Helicopter C.25 0.01 0.03 0.02 0.01
John E. Chance A Assoc., Inc.
8. Miscellaneous, D r i l l i ng
Projected Emissions (Total Tons)
Emitted Substance CO S0? NO. A
VOC TSP
Tow Tugboat(s) 4.?? * 19.98 1.60 *
Cementing Skid •J.OS 0.01 0.15 0.01 0.1)1
Crewboat horsepower of 2,500 Fourchon, Louisiana Waiting Time 4 hour(s) per t r i p
14 t r lo (s ) per week
Suppiy boat w i l l 200 kw generator Fourchon, Louisiana Waiting Time 10 he-jrs(s) per t r i p
4 tr1p(s) per week
Helicopter Fourchon, Louisiana
10 t r ip (s ) per week
Towing Tugboat horsepower of 4,500 Working for 6 day(s)
Cementing Skff "orsepower of 400 Working for Jay's) per well
Project Summary, Total Emissions
Emitted Substanca CO S0? N0X VOC T>*>
Allowable (tons/yr) 59387 2431 2431 2*31 243.
Projected Emissions (Tons/Year)
Year 1 8.72 0.81 45.32 2,86 0.6k
Total Emissions are comprised cf all Const-...::fon, Dri 11 Ini, 5nd Production Emissions.
John E. Chanco A Assoc., Inc.
I I I . Project Summaryt Total Emissions (cont 'd.)
This my Include the followlnq which are not "?edf1ed 1n each section:
- Weld*ng machines end cranes u t i l i zed Airing construction and d r i l l i n g oparations.
- Crane(sj, Ge/!era».or(s), ; i t j t e r Treater, and Compressor u t i l i zed during production.
IV. Findings of Air Quality Review
As per DOI-MMS regulations, th is f a c i l i t y Is exempt vrom further a i r quality review as i t has been determined that i t * i te ra t ion «*111 not have a s igni f icant adverse environmental impaci cr a i r qual i ty . Calculated emissions are for a worst case condit ion, ftctual emissions from this project w ^ l probably be lower.
V. Methodology
Dr i l l i ng - horsepower-hour/ft d r i l l ed method Boats - horsepower-hour method Hel icopter - landing/takeoff (LTO) cycle methoo A l l Other- - horsepower-hour method
V I . References
ATMOSPHERIC EMISSIONS FROM OFFSHORE OIL DEVELOPMENT AND PRODUCTION, EPA 450/3-77-026 (June, 1977).
COMPILATION OF AIR POILUTANT EMISSIONS FACTORS, EPA Report AP-42 (September, 1985), 4tT Edit ion.
* The EPA does not provide- and T*r emission factors for boats.