t I In Reply Refer To: RP-2-1 Office of Program Sarvfsat Sonat Exploration Cnwpany SEP 2 0 1985 Attention: Mr. D. I. Richards ro-t Office Box 1513 Information Services .too s ton, Texas 77251 Section Gen t leaven- toftmnct: 1s awdt to your Initial Plan of Exploration and Environmental Report received Septan**? 4, 19S5. for lease 0CS-(5 7722, Block 251, South Hart* it land Area. Tim pits includes the activities proposed for Wells A-A, H-A, C-A. In accordance wi h 30 CFR 250.34, rev. Oocenter 13, 1979, and our letter dated January 29, 1979, this plan ha* b**n d»ter«1ntd to be coaw/iete aa of Septenber 18, IMS, and la now being considered for approval. Your plan control number 1s N-2284 and should be reference* 1n your connwnfea- tlon and correspondence concerning thit plan* Sincerely your*. 0. If, Sol anas Rogtonal Seioervlaor Rules ami Production bec: , Lease OCS-6 7722 (0PS-3- 2) (FILE ROOM) (0P«,-3-4 w/Publ1c Info. Copy of the plan and ER (PUBLIC RECORDS R00N) MJTolbert:gcw:9/16/85 Disk 38 Sonat Exploration Company Post Office Box 1513 Houston TX 77261 1513 713 940 4000 MUM EXPLORATION August 30, 1985 Re: Plan of Exploration (POE) 0CS-G-7722 South Marsh Island Block 251 U. S. department of the Interior Minerals Management Service MINfRAlS MAW'FT tr-lCI Gulf Of Mexico OCS Region P. 0. Bo/ 7944 Metairie, Louisiana 70010-7944 SLP 0* 1S85 Attention: Deputy Minerals Manager for Offshore Operations Support (OS) Gentlemen: Enclosed are nine (9) copies of Sonets' Exploration's Initial Plan of Exploration (POL) for South Marsh Island Block 251 with only five (5) copies containing confidential information. A courtesy copy has been sent to the district MMS office in Lafayette. This Initial POE 1s filed 1n reference to wells A-A, B-A and C-A. Also enclosed with ;he copy going to the district office is our Archeological and Hazard Study and the original shot data of the two (2) lines nearest the proposed well sites. We understand that once the district office has rt viewed the report and shot data, they will be returned to us for our files. If you have any questions concerning this Initial POE or if you require any additional Information, please call me at 713/940-4014. Sincerely, D. E. Richards Supervisor of Drilling Engineering JAW Enclosures cc: US Department of the Interior Minerals Management Service P. 0. Box 3288 Lafayette, LA 70502-3088 SONAT EXPLORATION COMPANY Mivrwijt mnusmm <*>> South Marsh Island BLOCK 251 (OCS G 7722) OFFSHORE Louisiana SEP 04 1985 PUBLIC INFORMATION COPY In compliance with 30 CFR 250.34, the following information is submitted for the planned exploration activities: 1. Sonat plans to drill three exploratory wells in South Marsh Island Block 251. These wells require approximately 30 days to drill and evaluate A timetable is enclosed (Attachment 1). The surface locations of these wells, with respect to Block 251, are: Well Surface Location A-A 1000' FNL and 1000' FEL of Block 251 (see Attachment 7a) B-A 1700' FNL and 1300' FEL of Block 2^1 (see Attachment 7c) C-A 1500' FNL and 2500' FEL of Block 251 (see Attachment 7e) 2. Environmental safequards are discussed in the attached Environmental Report. 3. The three exploration wells will be drilled using a typical jack-up rig similar to the "Offshore Pegasus" drilling unit. A description of the rig and of features pertainlnq to safety and to pollution prevention and control are enclosed (Attachment 2a-2b). The drilling rig is the facility, under this plan, which is capable of producing air pollution. The main sources of air pollution on the rig will be the following engines: Four (4) Superior PTD-8 which will drive the rotary and drawworks; two (2) CAT D-398's and 1 CAT D-333 are used to drive the generators. During cementing, one (1) CAT D-311 engine will be used. Based on EPA emission factors, all of the facilities proposed in this POE are expected to produce the following total quantities of pollutants in one year's time: Total Emissions for All Calculated Exemptions Pollutant Facilities (tons/yr) E (tons/yr) Carbon Monoxide 24.1 21,789 Nitrogen Oxides 111.4 532.8 Sulfur Oxides 7.4 532.8 Particulates 7.9 532.8 Hydrocarbons 8.9 532.8 Aldehydes 1.7 532.8 SMI251 POE PI * w The total emissions for this proposed facility are clearly exempted from further air quality review under 30 CFR 250.57-l(d) for one year's operation. Projected emissions and the basis for all calculations are attached (Attachments 3a and 3b). 4. A vicinity map, which locates South Marsh Island Block 251, with respect to the Louisiana coast is enclosed (Attachment 4). 5. Onshore support facilities for drilling operations in Block 251 will be located in intracoastal City,LA. Sonat has a 24 hour communication base and loading dock facility established there. No additional facilities or personnel will be required as a result of the proposed activities. 6. Water depth at South Marsh Island Block 251 ranges from 20' to 24'. The Offshore Pegasus is capable of working in a minimum of 19' to a maximum of 125' during non-hurricane season. The drilling depth capacity of the rig is 16,000*. The rig is therefore capable of drilling the proposed wlls, 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 drilling spool to be installed on drive pipe while drilling the hole for conductor casing. The same diverter spool and blowout preventers will be installed on the conductor casing or drive pipe (whichever is applicable) while drilling the hole for the surface casing. For drilling below the surface casing, blowout prevention equipment will include: four (4) remote-controlled, hydraulically operated blowout preventers, including, two (2) equipped with pipe rams, one (1) with blind rams, and one (1) annular (BAG) type; a drilling spool; a choke line and manifold; a kill line and a fill-up line. 7. A Cultural Resources Report, with an Archeological Survey, was submitted on August 20, 1985. The proposed activities in the Initial POE will not affect the cultural resources of this lease. 8. All wells will be drilled in accordance with the relevant OCS orders. All reasonable precautions will be taken to avoid any oil or waste spills and the Sonat Oil Spill Contingency Plan (approved 1/21/85) shall be followed in the event of such a spill. This plan 1s on file in the New Orleans office of the Minerals Management Service and is available for public inspection. Attached are excerpts from the document showing the equipment to operate it, and information on response procedures within Sonat (See Attachment 6a-1). Sonat is a member of the Clean Gulf Association. SMI251 POE PI 11. Also enclosed 1s an Environmental Report and Sonat's Coastal Zone Management Consistency Certification for the activities described 1n this Initial POE. 12. A list of mud components, to be used during the proposed activities, is attached (Attachment 11). SMI251 POE PI ATTACHMENTS 1. Timetable 2. Rig Description 3. Emissions Calculations 4. Vicinity Map 6. Excerpts from Sonet's 011 Spill Contingency Plan 7. Surface Location Plats 10. Coastal Zone Consistency Certification 11. Mud Components List SMI251 POE PI ATTACHMENT 1 SONAT EXPLORATION COMPANY South Marsh Island Mock 251 (OCS 6 7722) OFFSHORE, .ouslana TIMETABLE OPERATION DATES Drill and Evaluate Well #A-A November 1, 1985 Drill and Evaluate Well #B-A December 1, 1985 Drill and Evaluate Well #C-A December 31, 1985 SMI251 POE Offshore Pegasus SELF-ELEVATING JACK-UP PLATFORM OPERATING WATER DEPTH II. DRILLING EQUIPMENT Maximum- 125 ft Drawworks National 110. drawworks. sandline. Minimum: 19 ft. driven by compound—Elmagco 6032 auiiliary brake Crown-O-Matic I. BARGE NULL EQUIPMENT Engines Four (41 Superior PTD-8 total 1940 HP Length Overall 188 feet Pump No. 1 National Nil 00 — 1100 HP. driven by Width Overall 106 feet compound Hull Depth 13 fett Pump No. 2 ... National N i l 00 — 1100 HP. driven by Jacks and Guide 20 ftet compound Slot . 4C wide by 21'long derrick ... Lee C. Moore. 140' I 30' I 30' Single well, galvanized 1.100.000 lbs gross Legs Four (4) 200' long, cylindrical, 10' di­ nominal capacity ameter Substructure Lee C Moore. 30' i 40* i 15' high. Tank Footings 20' » 40' i 8' 1.000.000 lbs. capacity jacks Eight (8) 600 tone capacity each with 2.6' stroke and jacking speed of 40' Rotary National C 365 per hour raising Crown Block Shaffer. KN. 600 tons Mud Storage 1.200 barrels liquid Traveling Block . Shaffer. PN. 500 tons 2.500 satV storage Hook Byron Jackson 5500. 500 tons Mud or Cement 2.400 cc. ft. bulk Smvel National. N 1324 — 500 tons Fuel Storage 1.340 barrels Shale Shaker . Hutchison Manufacturing Co.. 4860 OU Water Storage 300 barrels potable Light Plants ... Two (2) Caterpillar 0 379TA 350 KW 1,138 barrels drilling Water Distillation Two (2) MECO. 300 gallons per hour Orill Pipe 12.000* 5". 19 50 lb.. Range 2. Grade capacity "€' Accumulator Koomey. 00 710O-3G. 3000 psi. 100 Cranes Two (2). unit "Marinec" Model 500 — gallons 30 tons. B O.P. 1 — 20" H>dril MSP. 2.000 lb. WP Winches Two (21. Roundtree. Mcdel F. double 1 _ 12" Hydril GK. 3.000 lb. WP drum with four 8,500 lb.