Economic Development of Pennsylvanian Age Granite Wash Reservoirs with Horizontal Wells in the Anadarko Basin*
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1 Economic Development of Pennsylvanian Age Granite Wash Reservoirs with Wells in the Anadarko Basin* John Mitchell 1 Search and Discovery Article #10734 (2015) Posted March 30, 2015 *Adapted from presentation at the Tulsa Geological Society luncheon meeting, January 13, 2015, at the Oklahoma Geological Survey workshop, November 13, 2014, AAPG Education Directorate Forum, Granite Wash and Pennsylvanian Sand, Oklahoma City, Oklahoma, September 25, It is an update of Search and Discovery Article #20267 (2014), entitled Drilling of Deep Granite Wash Reservoirs, Anadarko Basin, Oklahoma and Texas. 1 Managing Partner / Consulting Geologist, Fall River Exploration LLC, Tulsa, Oklahoma (mtgeologist@yahoo.com) Abstract Economic oil and gas development in Pennsylvanian age Granite Wash reservoirs using horizontal wells in the Anadarko Basin is dependent on a number of geologic and engineering factors. The Granite Wash play is not a typical resource play in that it is occurring in a wide variety of reservoirs distributed through a 2,500-5,000 foot thick sedimentary sequence along a 125 mile long trend. This northwest to southeast trend extends from central Roberts County, Texas to northeastern Washita County, Oklahoma. Production depths range from 8,000 feet in Roberts County to more than 14,000 feet in Beckham and Washita Counties. Since 2002 more than 2,000 horizontal wells have been drilled. The vast majority of these wells have been drilled since Over 80 million barrels of oil/condensate and 1.8 trillion cubic feet of natural gas have been produced through early 2014 from these horizontal wells. These wells were producing approximately 50,000 BO and 1.1 BCFG daily as of early Approximately 75% of the wells have been drilled in the Texas portion of the play with another concentration of wells in Washita County, OK. Desmoinesian age sandstone and conglomerate reservoirs have been the target of the large majority of the drilling. Geologic targeting of reservoir horizons along with drilling, completion and production methodologies all play significant roles in determining the economic success operators are having in the horizontal Granite Wash play. This article reviews the distribution of horizontal wells by reservoir unit, location and trap type. Oil and gas production profiles and economic sketches by reservoir are presented along with observations about geological targeting, drilling and completion practices and hazards that industry operators have experienced in the development of this horizontal play.
2 References Cited Bouma, A.H., 2000, Fine-grained, mud-rich turbidite systems: Model and comparison and coarse-grained, sand-rich systems, in A.H. Bouma and C.G. Stone, editors., Fine-grained Turbidite Systems: AAPG Memoir 72, p Moore, G.E., 1979, Pennsylvanian paleogeography of the southern Midcontinent, in N.J. Hyne, ed., Pennsylvanian Sandstones of the Mid-Continent: Tulsa Geological Society Special Publication no. 1, p
3 Economic Development of Pennsylvanian Age Granite Wash Reservoirs with Wells in the Anadarko Basin John Mitchell, Managing Partner/Consulting Geologist Fall River Exploration LLC Tulsa, Oklahoma
4 The Granite Wash play extends over 125 miles from Roberts County, Texas southeast to Washita County, Oklahoma along the southwestern side of the Anadarko Basin More than a dozen key reservoir units were deposited in three Pennsylvanian stages (Atokan, Desmoinesian and Missourian) Arkosic sandstone and conglomerate reservoirs are 8000 to 14,500 feet deep in a sedimentary column ranging in thickness from 2500 to 5000 feet Production is primarily from stratigraphic traps Starting in 2002, over 2200 horizontal Granite Wash wells have been drilled, mostly since % of the horizontal wells have been drilled in the Texas Panhandle More than 92 million barrels of oil and 2.0 TCF of gas produced from over 1800 horizontal wells primarily over the last four years Estimated 2014 production of 17 MMBO and 305 BCFG Daily production in September 2014 of ~ 50,000 BOPD, 1.1 BCFGPD & 110,000+ BWPD Operators target reservoirs with high oil/condensate/natural gas liquids content In spite of initial annual decline rates in the 75-85% range, the initial high rate of return on investment and low risk provided attractive drilling opportunities Successful operations in the horizontal Granite Wash play demand the ability to cope with complexity in geological, engineering and land functions especially in today s low product price environment Significant changes in operators/ownership have occurred in past two years
5 Pennsylvanian Granite Wash Play Area
6 Northern Depositional Limit of Granite Wash Reservoirs Basin Axis Basin Axis Areas in red show locations of Pennsylvanian Granite Wash Oil & Gas Production
7 Lard Ranch Buffalo Wallow Allison-West Park-Frye W. Cheyenne-Grimes Mendota Berlin-Carpenter (Atoka Wash) Hemphill Basin Axis Braithwaite Basin Axis Stiles Ranch Mayfield Elk City Burns Flat Estimated 3.2 TCFG MMBO Cumulative Production from more than 4000 vertical wells since 1947
8 Northern Depositional Limit of Granite Wash Reservoirs Stars show locations of horizontal Granite Wash wells 2.0 TCFG + 92 MMBO Cumulative Production from more than 1800 horizontal wells since 2002 (primarily since 2009)
9 Low Relief Land Middle Pennsylvanian Geography Shallow Marine New Mexico Texas Carbonates - Shallow Marine Modified from Moore, 1979 Colorado Kansas Shallow Marine to Deltaic Deep Granite Wash Producing Area Oklahoma Deep Marine Ouachita Thrust Belt
10 Deepwater Submarine Fan Lobes (Proximal to Medial to Distal) Adapted From Bouma, 2000
11 Schematic Dip Section-Granite Wash Play Pennsylvanian
12 SERIES / STAGE Translation Chart for Texas Wash Stratigraphic Nomenclature Missourian Stage: Cottage Grove = Lansing Hogshooter = Upper Kansas City Checkerboard = Lower Kansas City Desmoinesian Stage: Marmaton B = Carr or Caldwell Marmaton C = Caldwell or Britt Marmaton D = Granite Wash A Marmaton E = Granite Wash B Marmaton F = Granite Wash C Upper Skinner = Granite Wash D Lower Skinner = Granite Wash E
13 (Kansas City) Type Log in the Missourian Wash, Deep Anadarko Basin, Texas & Oklahoma; Chesapeake #1-28 Mary K well, Sec. 28, T11N R23W, Beckham Co., Oklahoma (Lansing) feet of Missourian Series sediments with three distinct Granite Wash sections Missourian Wash Has Produced 27 MMBO and 119 BCFG from 364 s Since 2010
14 (Carr) (Caldwell) (Britt) (GW-A) (GW-D) (GW-E) Type Log Desmoinesian Wash, Deep Anadarko Basin, Texas & Oklahoma: Devon #16-4 Truman- Zybach, Sec. 16, Block R&E Survey, Wheeler Co., Texas feet of Desmoinesian Series Granite Wash section (GW-B) (GW-C) Desmoinesian Wash Has Produced 58 MMBO and 1.6 TCFG from 1357 s Since 2002
15 600 IDENTIFIED HORIZONTAL TARGET ZONES Desmoinesian Missourian Atokan
16 (Lansing Wash) TYPE LOG TYPE LOG 60 Feet COTTAGE GROVE WASH 90 API 10% POROSITY Interval Isopach Map Contour Interval: 40/100 Ft
17 (Lansing Wash) Interval Isopach Map Contour Interval: 40/100 Ft
18 (Lansing Wash) Interval Isopach Map Contour Interval: 40/100 Ft
19 Average Initial Potential: 699 BOEPD (118 Wells) Structure Map Contour Interval: 400 Ft
20 Average % Payout In 1 st Year: 103% (77 Wells) Structure Map Contour Interval: 400 Ft
21 (Upper Kansas City Wash) TYPE LOG TYPE LOG Source Rock 60 Feet HOGSHOOTER WASH Source Rock Interval Isopach Map Contour Interval: 40/100 Ft Source Rock 90 API 10% POROSITY
22 (Upper Kansas City Wash) Interval Isopach Map Contour Interval: 40/100 Ft
23 (Upper Kansas City Wash) Interval Isopach Map Contour Interval: 40/100 Ft
24 Average Initial Potential: 780 BOEPD (207 Wells) Structure Map Contour Interval: 400 Ft
25 Average % Payout In 1 st Year: 96% (129 Wells) Structure Map Contour Interval: 400 Ft
26 (Carr or Dunn Zone) (Carr) (Caldwell) (Britt) Shale Basin (GW-A) (GW-B) (GW-C) Interval Isopach Map Contour Interval: 40/100 Ft
27 (Carr or Dunn Zone) Shale Basin Interval Isopach Map Contour Interval: 40/100 Ft
28 (Carr or Dunn Zone) Shale Basin Interval Isopach Map Contour Interval: 40/100 Ft
29 Average Initial Potential: 599 BOEPD (168 Wells) Structure Map Contour Interval: 400 Ft
30 Average % Payout In 1 st Year: 97% (90 Wells) Structure Map Contour Interval: 400 Ft
31 (Britt or Caldwell Zones) (Carr) (Caldwell) (Britt) (GW-A) Shale Basin (GW-B) (GW-C) Interval Isopach Map Contour Interval: 40/100 Ft
32 (Britt or Caldwell Zones) Shale Basin Interval Isopach Map Contour Interval: 40/100 Ft
33 (Britt or Caldwell Zones) Shale Basin Interval Isopach Map Contour Interval: 40/100 Ft
34 Average Initial Potential: 578 BOEPD (397 Wells) Structure Map Contour Interval: 400 Ft
35 Average % Payout In 1 st Year: 84% (319 Wells) Structure Map Contour Interval: 400 Ft
36 (Granite Wash A Zone) (Dunn) (Caldwell) (Britt) (GW-A) (GW-B) (GW-C) Interval Isopach Map Contour Interval: 40/100 Ft
37 (Granite Wash A Zone) Interval Isopach Map Contour Interval: 40/100 Ft
38 (Granite Wash A Zone) Interval Isopach Map Contour Interval: 40/100 Ft
39 Average Initial Potential: 518 BOEPD (560 Wells) Structure Map Contour Interval: 400 Ft
40 Average % Payout In 1 st Year: 83% (417 Wells) Structure Map Contour Interval: 400 Ft
41 (GW-D) (GW-E) Shale Basin Interval Isopach Map Contour Interval: 200 Ft
42 (GW-D) (GW-E) Shale Basin Interval Isopach Map Contour Interval: 200 Ft
43 (GW-D) (GW-E) Shale Basin Interval Isopach Map Contour Interval: 40/100 Ft
44 Producer Average Initial Potential: 354 BOEPD (207 Wells) Structure Map Contour Interval: 400 Ft
45 Average % Payout In 1 st Year: 54% (141 Wells) Structure Map Contour Interval: 400 Ft
46 TOTAL SPUDDED WELLS BY COUNTY HRZ WELL STARTS BY YEAR THROUGH DECEMBER 31, Drilling & Production Data from IHS Enerdeq
47 PERMITTED STARTED 6% 7% DRY 3% JUNKED <1% OIL-GAS 84% STATUS # OIL-GAS 1963 STARTED 152 PERMITTED 136 DRY 77 JUNKED 9 TOTAL 2337 OIL-GAS STARTED PERMITTED DRY JUNKED Drilling & Production Data from IHS Enerdeq
48 ANNUAL OIL & GAS ANNUAL OIL PRODUCTION PRODUCTION FROM 22 MMBO 25,000,000 20,000,000 15,000,000 ",, 10,000,000 PENNSYLVANIAN GRANITE WASH.-'b ", ti_9~izontals 5,000, MMBO I I (thru Sept-Oct 2014 I I 305 BCFG ~ (thru Sept-Oct 2014) t-- / r-- ff ESTIMATED DAILY HORIZONTAL GRANITE WASH PRODUCTION SEPTEMBER 2014: 51,000 BOPD 1.1 BCFGPD FROM 1827 WELLS
49 SERIES / STAGE Cumulative Oil Production From Granite Wash Wells By Interval Through September 2014 Atoka Skinner 721,284 4,664,501 Cottage Grove 11,805,006 Marmaton 58,217,110 Hogshooter 13,816,873 COTTAGE GROVE MARMATON ATOKA HOGSHOOTER SKINNER
50 SERIES / STAGE Drilled ly To Date Missourian Wash Avg. Initial Potential 615 BOPD 1.6 MMCFGD GOR = Wells U. Desmoinesian Wash Avg. Initial Potential 245 BOPD 4.7 MMCFGD GOR = 19, Wells Atokan Wash Avg. Initial Potential (Deep) 42 BOPD & 7.5 MMCFGD GOR 178, Wells Avg. Initial Potential (Shallow) 179 BOPD & 1.9 MMCFGD GOR = 10, wells Increasing Gas/Oil Ratio & Oil Gravity
51 MAX MONTH INITIAL POTENTIAL (BOEPD) Conversion Factor for Converting Gas and NGL to Barrels Oil per Day Is Based Upon Revenue Values in October 2014 Oil Price: $90/bbl Gas Price: $7.00/mcf (Missourian); $5.50/mcf (Marmaton) NGL/mmcf: 150 bbls (Missourian); 100 bbls (Marmaton & Atokan) DATA POINTS: COTTAGE GROVE 118 WELLS HOGSHOOTER 207 WELLS MARMATON B 168 WELLS MARMATON C 397 WELLS MARMATON D 560 WELLS ATOKA 207 WELLS
52 AVERAGE DECLINE RATE (OIL)-1ST YEAR PRODUCTION DATE POINTS: COTTAGE GROVE 77 WELLS HOGSHOOTER 129 WELLS MARMATON B 90 WELLS MARMATON C 319 WELLS MARMATON D 417 WELLS ATOKA 141 WELLS
53 AVERAGE PERCENT PAYOUT FIRST 12 MONTHS PRODUCTION Well Costs: $7.1 MM (Missourian) and $7.8 MM (Marmaton) Oil Price: $90/bbl Gas Price: $7.00/mcf (Missourian); $5.50/mcf (Marmaton) NGL/mmcf: 150 bbls (Missourian); 100 bbls (Marmaton) Net Revenue: 80% Monthly Operating Costs: $8000 including compression As the horizontal wells develop longer production histories it will be interesting to see the ultimate recoveries and economic performances of the various reservoirs. Overall it is likely that the play will be characterized by high initial rates of return but more limited ultimate return on capital due to the steep decline rates on the wells. The collapse of oil prices in late 2014 may lead to shorter than anticipated well lives and returns on capital!
54 Inaccurate surface elevation surveys (it happens!) Surface management issues due to multiple horizontal wells from same location Getting intermediate casing set through lost circulation zones in L. Permian Building/drilling the curve through unstable shale intervals Avoiding shales to get stuck in while drilling the lateral Avoiding lost circulation zones (depletion zones) in target horizons causing differential sticking of bottom hole assemblies Avoiding existing vertical wells along well path Correct bit selection appropriate for rock types and drilling demands Slow/expensive penetration rates due to abrasive/hard formations Expensive wells: Current costs (September 2014) to drill and complete Granite Wash horizontals $7.0 - $8.0 MM not counting train wrecks! Lateral lengths ~5000 long; extended laterals rare due to land, regulatory and drilling issues
55 Acquiring/managing water for hydraulic fracturing of reservoirs Dealing with large amounts of flow back water after stimulation High temperature gas streams into pipeline Getting frac water off of formation as soon as possible after stimulation Handling/disposing of large volumes of produced formation water Expediting gas/oil sales immediately after stimulation Avoiding reserve losses (10-40%) in existing horizontals due to damage from hydraulic fracturing in new offset wells Installation and maintenance of artificial lift systems (gas lift) as flowing wells begin to load up with liquids (oil and water) Cost of gas compression and operating costs late in well life Management of surface facilities, flow lines, pipelines on leases with multiple laterals in stacked pay zones Maintaining and extending the productive lives of horizontal wells after large declines in rate and pressures by 2 nd year and beyond Ultimate recoveries of wells will vary significantly because of reservoir quality, evolution of stimulation technology, date wells drilled EUR s and economics highly variable because of the complexity!
56 SPUDDED HORIZONTAL GRANITE WASH WELLS BY OPERATOR THROUGH PRODUCING HORIZONTAL GRANITE WASH WELLS BY CURRENT OPERATOR JAN Major divestitures through property sales occurred in Apache, Newfield, Linn, QEP, Forest, SM Energy, Pogo, Plains and others have eliminated or greatly reduced their holdings in the play. This has resulted in establishing Enervest/Four Point and Le Norman as significant operators in the Granite Wash play. 0 Drilling & Production Data from IHS Enerdeq
57 Consolidation through major property sales occurred in resulting in establishing Enervest/Four Point and Le Norman as major operators in the Granite Wash play. Apache, Newfield, Linn, QEP, Forest, SM Energy, Pogo, Plains and others have eliminated or greatly reduced their holdings in the play. With the 50%+ drop in oil and gas prices as of January 2015, operators in the Granite Wash play face difficult economic challenges Until drilling and completion costs decline significantly, the horizontal Granite Wash play is uneconomic for most industry players Significant oil and gas resources remain in various areas of the Granite Wash play in very fine grained sandstone, siltstone and shale reservoirs as well as in the lightly exploited gas prone Atokan Wash horizons A time out in drilling activity will allow companies an opportunity to review the geological and engineering factors that have created economically successful opportunities; these lessons will be applied to the Wash play when economic conditions improve
58 The Granite Wash play extends over 125 miles from Roberts County, Texas southeast to Washita County, Oklahoma, along the southwestern side of the Anadarko Basin More than a dozen key reservoir units were deposited in three Pennsylvanian stages (Atokan, Desmoinesian and Missourian) Arkosic sandstone and conglomerate reservoirs are 8000 to 14,500 feet deep in a sedimentary column ranging in thickness from 2500 to 5000 feet Production is primarily from stratigraphic traps Starting in 2002, over 2200 horizontal Granite Wash wells have been drilled, mostly since % of the horizontal wells have been drilled in the Texas Panhandle More than 92 million barrels of oil and 2.0 TCF of gas produced from over 1800 horizontal wells primarily over the last four years Estimated 2014 production of 17 MMBO and 305 BCFG Daily production in September 2014 of ~ 50,000 BOPD, 1.1 BCFGPD & 110,000+ BWPD Operators target reservoirs with high oil/condensate/natural gas liquids content In spite of initial annual decline rates in the 75-85% range, the initial high rate of return on investment and low risk provided attractive drilling opportunities Successful operations in the horizontal Granite Wash play demand the ability to cope with complexity in geological, engineering and land functions especially in today s low product price environment Significant changes in operators/ownership have occurred in past two years
59 Many thanks to several colleagues who generously gave me their time and insights into the Granite Wash play. Also, eternal thanks to my lovely wife Carol Mitchell for her support and patience with my many long nights at the office over my career.
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