ENHANCED OIL RECOVERY PLANNING FOR THE LUCKEY DITCH FIELD

Transcription

1 ENHANCED OIL RECOVERY PLANNING FOR THE LUCKEY DITCH FIELD Team Five: Rebecca Roskowski (Team Leader) Blake Robinson Christopher Siebert Hamilton Smith Whitney Smith Petroleum Engineering Undergraduate Research Day: April 30 th, 2016

2 Outline Gantt Chart and Work Flow Field Overview Field Map Static Model Attempt Reservoir Characterization OOIP Volumetrics CO 2 EOR Elimination Hydrocarbon EOR Elimination Nitrogen EOR Selection Environmental Effects of N 2 Injection Minimum Miscibility Pressure Nitrogen Enhanced Production Economic Analysis Summary Conclusion Recommendations

3 Gantt Chart Legend

4 Phase 1 Gantt Chart

5 Phase 2 Gantt Chart

6 Phase 3 Gantt Chart

7 Workflow Overview and Legend

8 Phase 1 Workflow

9 Phase 2 Workflow

10 Phase 3 Workflow

11 Field Overview 7 oil wells, and 4 gas wells 1 shut in and 4 abandoned First well completed in May 1985 Present day operators Oryx Energy Company, Proven Petroleum Inc., Anadarko E&P Onshore LLC, Phillips Petroleum Company, Whiting Oil and Gas Corporation Estimated primary recovery: Oil: 10,000,000 BO As of August, 2015: 9,779,073 BO Gas: 80,000 MMSCF 73,213 MMSCF

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13 Computer Programs and Static Model Attempt NeuraLog was used to digitize the given logs Petrel was used to model the geology of the subsurface of the reservoir The static model did not yield accurate values within the model Negative saturation values Inaccurate permeability and porosity A working static model proved impossible therefore a dynamic model could not be made

14 Whiskey Spring and Taylor Ranch Whiskey Springs and Taylor Ranch discovered in same area around the same time In communication with Luckey Ditch reservoir Lines between the three are arbitrarily drawn Producing area of all three: acres Producing area of Luckey Ditch ~ 6400 acres

15 Reservoir Properties Permeability: 60md Porosity: 14% Temperature: 250 F Water resistivity: ohm-m at formation temp. Average reservoir pay thickness: 25 feet Water saturation varies

16 Reservoir Characterization Lithology: Fluvial point bar sandstone interbedded with shale layers Discontinuous reservoir Shale layers interbedded with the sandstone Presence of anticlines and synclines Drive mechanism: gas cap originally and solution gas drive as the pressure drops

17 Reservoir Characterization (Continued) Fluid properties: 43⁰ API oil, 85% methane, sweet gas Production varies from well to well Natural flow, with selective perforations No treatments to date

18 OOIP Volumetric Calculation Given OOIP to compare: 29,230,243 bbls N OOIP = 7758 A h Φ (1 S w) Bo i B oi = rb/stb A = 6400 Acres h avg = feet ɸ(1-S w ) avg = Calculated OOIP: 27,915,863 bbls 4.5% error Using calculated OOIP, current recovery: 35%

19 CO 2 EOR Elimination Wrong hydrocarbon mix Recommended majority composition: C 5 -C 12 Luckey Ditch: C 5 -C 12 = 14.09% C 1 -C 4 = 77.75% Corrosion Luckey Ditch is an old field May be more susceptible to damage and leakage

20 Produced Hydrocarbon EOR Elimination Wrong hydrocarbon mix C 2 -C 7 is recommended, Luckey Ditch has 62.64% C 1 The field has a market for produced hydrocarbon gas Potential lack of infrastructure for the gas sales June, July and August 2015: gas accounted for 22% of all sales Slows natural pressure depletion Producing for over 30 years Valid idea 20 years ago

21 Nitrogen EOR Selection C 1 to C 7 is optimal for N 2 from EOR lookup tables Luckey Ditch is 83.87% C 1 to C 7 with C 1 to C 4 at 77.75% EOR Method Gravity ( API) Viscosity (cp) Nitrogen >35 (35,48) <0.4 (0.4,0.2) Field Gravity ( API) Oil Properties Oil Properties Viscosity (cp) Luckey Ditch Composition High Percent of C1-C7 Composition High Percent of C1-C7 Reservoir Characteristics Oil Saturation (% PV) >40 (40,75) Oil Saturation (% PV) Formation Type Sandstone or Carbonate Reservoir Characteristics Formation Type Depth (ft) >6000 Depth (ft) 42 Sandstone 15300

22 Environmental Effects of N 2 Injection DO NOT let the nitrogen escape into the surroundings Increased nitrogen levels lead to: Human health problems Dead zones in bodies of water Algae blooms Increased reactive nitrogen levels lead to: NOx s (nitrogen oxides) Greenhouse gases

23 Calculation of Minimum Miscibility Pressure (MMP) N 2 MMP = C L T C L T 2 MW MW T C L = Mole fraction of methane = C i T 2 MW C i = Mole fraction of intermediates and CO 2 = MW = Molecular weight of heptanes plus = 211 g/mole MW + T = Reservoir temperature = 250 Fahrenheit = 710 Rankine N 2 MMP = N 2 MMP = 5455 psi

24 Nitrogen Enhanced Production (large scale) SPE analyzed field MMP-5400 psi 10%, maintain 6000 psi bottom hole pressure Average depth-14,764 ft Displacing large amounts of oil Recovery factor of 0.85 N 2 needed 2.89 MSCF [N 2 ]/STB [oil] Luckey Ditch Field MMP-5455 psi 10%, maintain 6000 psi bottom hole pressure Average depth-15,300 ft Displacing large amounts of oil Recovery factors of 0.45, 0.55, and 0.65 N 2 needed 2.89 MSCF [N 2 ]/STB [oil]

25 Nitrogen Enhanced Production Table OOIP [STB] RECOVERY FACTOR [fraction] PRODUCED OIL [STB] NEW 10 YEAR PRODUCED OIL [STB] N2 NEEDED [MSCF] xxxx xxxx OOIP RECOVERY FACTOR PRODUCED OIL = NEW 10 YEAR PRODUCED OIL NEW 10 YEAR PRODUCED OIL 2.89 MSCF N 2 STB OIL = N 2 NEEDED

26 General Pricing of Luckey Ditch Field Facilities required to separate nitrogen from oil and gas Facilities to extract nitrogen from surrounding air Compressors and compression for well applications Drilling of injectors

27 Calculation of the General Pricing Luckey Ditch OOIP SPE Analyzed Field = 12,000,000,000 STB OOIP Luckey Ditch Field = 27,900,000 STB General Pricing SPE = $1,500,000, dollars General Pricing Luckey Ditch = UNKNOWN 1999 dollars = x

28 Calculation of the General Pricing Luckey Ditch OOIP SPE Analyzed Field OOIP Luckey Ditch Field = General Pricing SPE General Pricing Luckey Ditch 12,000,000,000 [STB oil] 27,900,000 [STB oil] = $1,500,000,000 [1999 dollars] x [1999 dollars] x = $34,894, [1999 dollars] General Pricing Luckey Ditch = $49,877, [2016 dollars]

29 Economic Analysis OIL REVENUE, GENERAL PRICING, AND TOTAL REVENUE TABLE AFTER 10 YEARS AVERAGE OIL PRICE [$/BBL] $32.00 $38.00 $44.05 $50.00 $60.00 SCENARIO 1 NON-ENHANCED [$] SCENARIO 2 RF OF 0.45 [$] SCENARIO 3 RF OF 0.55 [$] SCENARIO 4 RF OF 0.65 [$] OIL REVENUE $19,213, $89,058, $178,388, $267,719, GENERAL PRICING LUCKEY DITCH $0.00 $49,877, $49,877, $49,877, TOTAL REVENUE $19,213, $39,180, $128,511, $217,842, OIL REVENUE $22,815, $105,756, $211,836, $317,917, GENERAL PRICING LUCKEY DITCH $0.00 $49,877, $49,877, $49,877, TOTAL REVENUE $22,815, $55,879, $161,959, $268,039, OIL REVENUE $26,448, $122,594, $245,563, $368,532, GENERAL PRICING LUCKEY DITCH $0.00 $49,877, $49,877, $49,877, TOTAL REVENUE $26,448, $72,716, $195,686, $318,655, OIL REVENUE $30,020, $139,153, $278,732, $418,311, GENERAL PRICING LUCKEY DITCH $0.00 $49,877, $49,877, $49,877, TOTAL REVENUE $30,020, $89,275, $228,855, $368,434, OIL REVENUE $36,024, $166,983, $334,479, $501,974, GENERAL PRICING LUCKEY DITCH $0.00 $49,877, $49,877, $49,877, TOTAL REVENUE $36,024, $117,106, $284,601, $452,096,875.19

30 Economic Analysis Minimum recovery factor overcome general pricing after 10 years AVERAGE OIL PRICE [$/BBL] RECOVERY FACTOR TO BREAK EVEN RECOVERY FACTOR = $ $ $ $ $ GENERAL PRICING LUCKEY DITCH AVERAGE OIL PRICE OOIP + PRODUCED OIL

31 Economic Analysis YEARS TO SURPASS GENERAL PRICING OF LUCKEY DITCH FIELD AVERAGE OIL PRICE [$/BBL] SCENARIO 2 RF OF 0.45 [YEARS] SCENARIO 3 RF OF 0.55 [YEARS] SCENARIO 4 RF OF 0.65 [YEARS] $ $ $ $ $ GENERAL PRICING LUCKEY DITCH OIL REVENUE 120 MONTHS 12 MONTHS YEAR = YEARS TO SURPASS GENERAL PRICING

32 Summary Gantt Chart and Work Flow Field Overview Field Map Static Model Attempt Reservoir Characterization OOIP Volumetrics CO 2 EOR Elimination Hydrocarbon EOR Elimination Nitrogen EOR Selection Environmental Effects of N 2 Injection Minimum Miscibility Pressure Nitrogen Enhanced Production Economic Analysis

33 Conclusions Nitrogen flood 5 producers, 5 injectors Due to lack of field continuity Vaporize light hydrocarbons Upgrade oil density Based on Reservoir pressure assumption above MMP Oil properties Current reservoir boundaries

34 Recommendations Connectivity data New logs to identify better boundaries with Whiskey Springs and Taylor Ranch Pressure data Is the MMP realistically achieved? Additional logs Better static and dynamic models More detailed simulation More information on how N 2 injection affects gas production

35 Citations Mungan, Necmettin. Enhanced Oil Recovery with High Pressure Nitrogen Injection. SPE Western Regional Meeting(2000):n. pag. Digital file. SPE MS Sebastian, H. M., and D. D. Lawrence. "Nitrogen Minimum Miscibility Pressures." SPE/DOE Eight Symposium on Enhanced Oil Recovery (1992): n. pag. Print. SPE Taber, J. J., F. D. Martin, and R. S. Seright. "EOR Screening Criteria Revisited- Part 1.Introduction to Screening Criteria and Enhanced Recovery Field Projects." SPE Reservoir Engineering (1997): Print. SPE Taber, J. J., F. D. Martin, and R. S. Seright. "EOR Screening Criteria Revisited-Part 2: Applications and Impact of Oil Prices." SPE Reservoir Engineering(1997): Print. SPE Wyoming Oil and Gas Conservation Commission Luckey Ditch, Web. 14 Oct 2015.

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