Deepwater Gulf of Mexico 2004: America's Expanding ... - OCS BBS

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2010 - 2011 (558 leases) Louisiana Mississippi Alabama Florida Texas 1000 ft 1500 ft 5000 ft 7500 ft 2012 - 2013 (525 leases) Louisiana Mississippi Alabama Florida Texas 1000 ft 1500 ft 5000 ft 7500 ft 50 0 50 mi 50 0 50 km Figure 28. Anticipated lease expirations in the Gulf of Mexico (continued). 46
DRILLING AND DEVELOPMENT Deepwater drilling occurs from mobile offshore drilling units (MODU’s), such as semisubmersible units or drillships (figures 29 and 30), and from platform rigs. There are numerous deepwater prospects waiting to be drilled, and there will be many that remain undrilled before the primary lease terms expire because of the limited number of rigs available for deepwater drilling in the GOM. Figure 31 depicts deepwater rigs operating in the GOM from 1992 through 2003. 1 There was a steady increase in the average number of rigs operating from 1992 to a peak in 2001. However, in the past two years, the number of rigs operating has decreased 29 percent. Figure 32 shows the number of deepwater MODU’s by water-depth categories in the GOM and worldwide. Approximately 28 percent of the world’s fleet of deepwater drilling rigs is committed to GOM service (Harding and Albaugh, 2003). The pie chart within figure 32 shows the distribution of deepwater rigs by major operating area. Most, if not all, of the deepwater-capable drilling rigs are under long-term contractual arrangements. The reader is cautioned not to draw any conclusions from the rig count differences between figures 31 and 32. As mentioned above, figure 31 includes platform rigs in addition to MODU’s; figure 32 addresses MODU’s only. Further, not all MODU’s in figure 32 are operating at any given time and upgrades to MODU’s that increase their water-depth capability will alter the rig counts shown, so year-to-year comparisons may not be valid. DRILLING ACTIVITY The number of deepwater wells drilled generally increased from 1992 through 2001; however, the activity has declined in the last two years. Only original boreholes and sidetracks are included in the well counts used in this report. Wells defined as “by-passes” are specifically excluded. A “by-pass” is a section of well that does not seek a new objective; it is intended to drill around a section of the wellbore made unusable by stuck pipe or equipment left in the wellbore. Figure 33 shows that most of the drilling has occurred in the 1,500- to 4,999-ft (457- to 1,524-m) water-depth range. Despite an overall decline in recent years, considerable drilling activity occurred in water depths greater than 7,500 ft (2,286 m). It is interesting to note that, in November 2003, the first well began drilling in over 10,000 ft (3,050 m) of water and more are anticipated. Figures 34 and 35 further break down the deepwater well counts into exploratory and development wells, respectively. This report uses the designation of exploratory and development wells provided by the operators. The data reflect the variations among operators in classifying wells as either development or exploratory. In the past two years, there has been a decrease in the number of exploratory wells drilled. This is best illustrated by looking at the number of wells drilled in the 1,500- to 4,999-ft (457- to 1,524-m) water-depth range. While exploratory drilling at this depth is decreasing, drilling in the 5,000- to 7,499-ft (1,524- to 2,286-m) and the >7,500 ft (2,286 m) water-depth ranges is increasing. There has also been a decrease in the number of development wells drilled in the last year. Possible reasons for the recent decrease may be the method by which wells are categorized in this report (exploratory versus development), the retention of exploratory wells for production purposes, and the lag from exploration to first production. The complexity of the deepest water developments may also be a factor, requiring operators to spend more time in planning and design. Most development drilling was in the 1,500- to 4,999-ft (457- to 1,524-m) water-depth range; there are no development wells in water depths exceeding 7,500 ft (2,286 m). Figure 36 illustrates the geographic distribution of deepwater exploratory wells. Note the progression into the western GOM and into deeper water through time. Figure 37 depicts the locations of deepwater development wells. Once again, the data reveal a general increase in activity as well as a trend toward increasing water depth with time. 1 It is important to note that the rig count includes platform rigs operating on deepwater production facilities in addition to the MODU’s. About one-third of all rigs are platform rigs. The numbers do not distinguish between rigs drilling and those in service for completion and workover operations. 47
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ON COVER - The cover features four
Page 5 and 6:
Table of Contents Page PREFACE.....
Page 7 and 8:
Figures Page Figure 1. The Gulf of
Page 9 and 10: Figures — continued Page Figure 5
Page 11: Tables Page Table 1 List of Deepwat
Page 15 and 16: INTRODUCTION The deepwater Gulf of
Page 17 and 18: BACKGROUND DEFINITIONS The GOM Oute
Page 19 and 20: EXPANDING FRONTIER When the origina
Page 21 and 22: 1992 - 1993 Louisiana Mississippi A
Page 23 and 24: 1992 - 2003 Texas Louisiana Mississ
Page 25 and 26: fffffffffffffffff 1500 ft Quaternar
Page 27 and 28: In addition to the traditional oil
Page 29 and 30: 15 Figure 8. Gas hydrates on the se
Page 33 and 34: 4,500 4,000 Number of Active Leases
Page 35 and 36: ENVIRONMENTAL ACTIVITY The extensiv
Page 37 and 38: Operators submit a remotely operate
Page 39 and 40: 25 Figure 15. Loop and eddy current
Page 43 and 44: 29 Deepwater Discoveries $ #Y Texas
Page 45 and 46: 31 Texas ð PORT ARANSAS 1000 ft 15
Page 47 and 48: Louisiana Mississippi Alabama 33 Te
Page 49 and 50: Pipelines New pipelines Proposed pi
Page 51 and 52: LEASING Until the mid-1990's, leasi
Page 53 and 54: Number of Leases Bid On 600 500 400
Page 59: 2004 - 2005 (741 leases) Louisiana
Page 63 and 64: 49 Figure 30. The Discoverer Deep S
Page 65 and 66: 51 Number of Wells Spudded 250 200
Page 67 and 68: 120 > 7,500 ft 107 108 100 5,000 -
Page 73 and 74: 180 160 Deepwater EP Deepwater DOCD
Page 75 and 76: 340 626 390 472 472 456 393 475 590
Page 77 and 78: Year of First Production Table 4 De
Page 79 and 80: Year of First Production Table 4 De
Page 81 and 82: A predominant workhorse of the GOM
Page 83 and 84: 3 Number Installed 2 1 0 2004 69 TL
Page 85 and 86: Flow lines to host platform Subsea
Page 87 and 88: 140 131 120 100 78 Number of Wells
Page 89 and 90: RESERVES AND PRODUCTION The deepwat
Page 91 and 92: 77 Million Barrels of Oil Equivalen
Page 93 and 94: 18 16 14 12 10 8 Number of Fields 6
Page 95 and 96: 81 Million Barrels of Oil Equivalen
Page 97 and 98: 45,000 40,000 Million Barrels Oil E
Page 99 and 100: 1992-1993 1994-1995 1996-1997 Lease
Page 101 and 102: S hallo w- wa ter GOM 11% Deepwater
Page 103 and 104: 1,200,000 1,000,000 Total productio
Page 105 and 106: 1,100,000 1,000,000 Subsea oil Tota
Page 107 and 108: 900,000 800,000 Majors Nonmajors 70
Page 109 and 110: 45,000 40,000 Max oil rate 1,000-1,
Page 111 and 112:
4,000 3,500 Shallow water Deepwater
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Texas Auger Louisiana SS182 Troika
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SUMMARY AND CONCLUSIONS This report
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2,500 Number of leases Average U.S.
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Number of Years 14 12 leas es in p
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data for this analysis include only
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80 2500 70 60 Number of leases dril
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4,500 4,000 3,500 Leases tested Lea
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• Nonmajor companies have made mo
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REFERENCES Bascle, B. J., L. D. Nix
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Project Name Area/Block Water Depth
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Sale Number Sale Location Sale Date
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Completed Studies [MMS Study Number
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Group Name Company Name MMS Number
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Group Name Company Name MMS Number
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Appendix G. Subsea Completions. Are
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Area Block API Number Operator Comp
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Area Block API Number Operator 144
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Year Shallowwater Oil (MBOPD) Deepw
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