Eugene Island Block 330 Field-- Development and Production History
- Ronald L. Lewis (Pennzoil Co.) | Harvey J. Dupuy Jr. (Pennzoil Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- November 1983
- Document Type
- Journal Paper
- 1,956 - 1,962
- 1983. Society of Petroleum Engineers
- 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 4.1.6 Compressors, Engines and Turbines, 6.5.2 Water use, produced water discharge and disposal, 4.5 Offshore Facilities and Subsea Systems, 4.2 Pipelines, Flowlines and Risers, 5.8.5 Oil Sand, Oil Shale, Bitumen, 2.4.3 Sand/Solids Control, 5.1.2 Faults and Fracture Characterisation, 2.2.2 Perforating, 4.1.5 Processing Equipment, 4.3.4 Scale, 4.1.2 Separation and Treating, 5.4.2 Gas Injection Methods, 1.2.3 Rock properties, 4.6 Natural Gas, 1.6 Drilling Operations, 5.2.1 Phase Behavior and PVT Measurements, 5.1.1 Exploration, Development, Structural Geology
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Eugene Island Block 330 field is currently the largest oil- producing field in federally owned offshore waters of the U.S. The field is located about 170 miles southwest of New Orleans (Fig. 1). The first leases were purchased in Dec. 1970. Three months later, a major discovery was apparent when exploratory wells drilled by Pennzoil and Shell on adjoining Blocks 330 and 331, respectively, established a 900-ft column of hydrocarbon-bearing sands. By the end of 1971, two platforms had been set, and development was under way. Four more platforms were set during 1972 and ultimately nine platforms were installed in the field. Initial production began in Sept. 1972 from Block 331.
Hydrocarbon accumulation occurs in more than 25 sandstone reservoirs located at 2.200 to 12,000 ft. Recoverable reserves are estimated to be greater than 225 million bbl of liquid hydrocarbons and 950 Bcf of gas. Improved recovery operations began in Aug. 1975, utilizing water injection on Blocks 331 and 314 and through-gas injection in Dec. 1979 on Block 330. Through Dec. 1982, cumulative production was 224 million bbl of liquid and 1.03 Tcf of gas. This production is graphically illustrated in Figs. 2 and 3. This field is unique in the quick timing of operations to develop and initiate production.
Eugene Island 330 field consists of portions of seven U.S. government lease blocks of 5,000 acres each as illustrated in Fig. 4. Operators are Exxon (2 blocks). Pennzoil (2 blocks), Shell Oil Co. (1 block), and Texaco Inc. (2 blocks).
Several other operators having, interests jointly with Pennzoil are Exxon Corp., Mesa Petroleum Co., Mobil Corp., Pogo Producing Co.. Texas Production Co. and its subsidiaries, Pinto Inc. and Ecee Inc. Tenneco Inc. has interest jointly with Texaco in Block 338.
This paper discusses the total geological complex and then follows the development and production history of the primary block, Eugene Island Block 330.
Early exploration of the Eugene Island Block 330 area followed the Dec. 1970 offshore lease sale. Exploratory drilling began in Feb. 1971. By Oct. 1971, sufficient successful exploratory wells had been drilled to determine locations for five platforms. Subsequent exploratory and development drilling proved the necessity of four more platforms. As shown in Fig. 4, there have been 26 exploratory wells drilled and 9 eight-pile drilling and production platforms and 4 four-pile satellite production platforms set.
The field is an anticlinal structure on the downthrown side of a large arcuate-trending growth fault.
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