SPE Distinguished Lecturer Program

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1 SPE Distinguished Lecturer Program Primary funding is provided by The SPE Foundation through member donations and a contribution from Offshore Europe The Society is grateful to those companies that allow their professionals to serve as lecturers Society of Petroleum Engineers Distinguished Lecturer Program Additional support provided by AIME

2 This year marks the 50 th anniversary of the SPE Distinguished Lecturer program. Please visit our site to learn more about this amazing program.

3 From Black to Gold: Nanotechnology in Upgrading of Heavy Asphaltic Crude Oils Murray R Gray Department of Chemical and Materials Engineering University of Alberta Edmonton, Canada Society of Petroleum Engineers Distinguished Lecturer Program

4 Outline Heavy oil and its properties Benefits and challenges of upgrading heavy oils Nanotechnology definition and significance for the petroleum industry Definition of asphaltenes and their significance Molecular composition Opportunities for nanotechnology In situ upgrading technologies 4

5 Heavy Oil Wafra Field Steamflood Neutral Zone Chevron Joint Venture Wafra o API High Sulfur Dense crude oil with API o < 20 Significant resources worldwide Lower H, higher S, N and metals than light crudes High proportion of the barrel cannot be distilled, even under vacuum, circa 50% residuum 5

6 Viscosity of Heavy Oil Crude oil viscosity normally increases with density Bitumen with 9 o API, 1,000,000 cp at 15 o C 1-methyl naphthalene: 9.8 o API, viscosity 2.6 cp Mercury: API o =-121 and viscosity 1.5 cp Why? 6

7 Why is heavy oil viscous? Viscosity of liquids is due to intermolecular forces Larger molecules in heavy oil give more interaction Asphaltene fraction gives aggregates in the oil phase, size 5-20 nm Overlap of aggregates gives very high viscosity Rev. Inst. Fr. Petrole,

8 Incentives for Upgrading of Heavy Oil Transportation: Reduce viscosity to enable transport without adding a solvent (Canada, Venezuela) or heating pipeline (Alaska) Price: Increase the API gravity, reduce sulfur content Refineries value high API crude oils Viscosity is not a significant issue for refineries

9 Example Upgrader Configurations Production Upgrader Pipeline Refinery Diluent to reduce viscosity

10 Upgrading Economics Complex expensive installations Capex: $30K-$100K per (barrel/day) of throughput Typical scale: kbbl/d Total cost circa $10 billion Operating costs $5-$10/BBL Significant loss of volume to byproducts 10

11 Upgrading Yield and Quality Capital cost: Hydroconversion > Coking > Deasphalting 11

12 Canadian Light-Heavy Differential Par price Hardisty Blend (US IEA) 12

13 Iconic Image of Nanotechnology STM image of xenon atoms on Ni, Don Eigler, 28 Sep 1989 Franks (1987) defined nanotechnology as..technology where the dimensions and tolerances in the range nm (from the size of an atom to the wavelength of light) play a critical role Ultrafine powders of nanoscale particles Nanoelectronics molecular electronics, including both semiconductor, organic and hybrid systems How does this relate to heavy oil?

14 Besenbacher et al., 2008 Profitable Nanotechnology Catalysts for making lowsulfur diesel and gasoline Co+Mo or Ni+Mo on alumina with high-pressure hydrogen First used in 1940 s STM shows brim sites of high activity BRIM catalysts commercialized in 2004

15 Asphaltenes: Turning adversaries to allies Most difficult fraction in heavy oils Soluble in toluene, and insoluble in n-heptane Understanding asphaltenes unlocks the value of bitumen/heavy oil resources (i.e. upgrading) Nanotechnology is the key Understand, measure, and control behavior at length scale < 0.1 μm 15

16 Imaging of Individual Molecules Nakamura et al, Science, 2007 Gross et al., Science, 2009 STM - Attach CO molecule to tip of probe TEM Isolate molecule in a carbon nanotube

17 Image of Nano-Aggregates of Asphaltenes 1 μm 30 minute immersion of silicon wafer in dilute solution of asphaltene in toluene Atomic force microscopy images courtesy JH Masliyah and Z Xu 17

18 What do asphaltenes look like? Hokusai, 1817 The Blind Men and the Elephant

19 How are asphaltene molecules constructed? Based on Sheremata et al., 2004; Strausz 1999 Bridged Ring Groups Condensed Alkyl Aromatics

20 Pyrolysis apparatus Induction furnace To vent or gas bag (GC) Curie point alloy strips coated with asphaltenes Liquid N 2 20

21 Classes of products: Gas chromatography-mass spectrometry Cold Lake C 7 asphaltenes (1 ring includes olefins) 21

22 Small Blocks Boiling < 538 o C # Rings n-c 12 to Paraffins n-c 30 Abundance Large Blocks Boiling > 538 o C Cycloalkanes Aromatics Thiophenes S S S S S Sulfides S S S S S Asphaltenes built up from 1-10 large and small building blocks One block Two blocks Three blocks Four+ blocks

23 Why do asphaltenes aggregate so Asphaltenes = Molecular velcro Much more difficult to analyze than DNA Range of functional groups interact Kinetics may be important strongly? 23

24 Asphaltene Assembly Blue = Water and acid-base interactions Orange = hydrophobic domain Purple = Metal base interactions Green = aromatic stacking 24

25 Nanotechnology Opportunities Design catalysts for large molecules in heavy oil Atomic level imaging + computer simulation + controlled synthesis of catalysts Design dispersants to prevent aggregation of asphaltenes Control molecular behavior during upgrading Control viscosity?

26 In Situ Upgrading Why not upgrade in situ to avoid capital expense? Reduce viscosity crack large molecules Reduce density increase H content, reduce S & N Significant reactions require temperatures > 300 o C Two approaches under development: Partial combustion to generate hydrogen in situ Coke the oil in place 26

27 In Situ Combustion with Horizontal Wells (THAI Process) Image from Petrobank Resources

28 THAI Heavy Oil Pilot

29 In situ Combustion PLUS Catalysis Harness the CO from partial combustion: CO + H 2 O = H 2 + CO 2 Catalyst needed to combine the hydrogen with the oil Two approaches: CAPRI - Place catalyst around production well bore to make use of gases to hydrogenate oil: Inject nanoparticle catalysts (MoS 2 ) into the formation Catalysts require high temperature (>300 o C), high P H2, long time (1 h)

30 Pack annulus around production tubing with catalyst

31 Flowing Nanocatalyst Particles Zamani et al., cm sand pack with 200 nm particles

32 How to inject catalyst into flowing oil? Image from Petrobank website

33 In Situ Combustion: Production Versus Upgrading Interesting and challenging production technology Control of process Sensitive to reservoir heterogeneities Oxygen breakthrough? Upgrading requires exposure of oil to high temperature Tradeoff between using heat to mobilize oil versus upgrading High complexity of subsurface process

34 Shell In Situ Upgrading Process (IUP) o C Shell Canada tested technique at Peace River Electrical heaters raise temperature to o C Coke the heavy oil in situ, vaporizing the cracked products Vapor collected in wells above the heaters New Technology Magazine, June 2008

35 Pilot Test at Peace River, Canada Pilot testing in Peace River on bitumen Project began in 2004, completed in wells for the field test 18 well for electric heaters, 3 producing wells 8 observation wells Produced over 100,000 barrels Light oil product 30 to 49 o API from 8-10 o API bitumen Recovery 50% of OOIP Only achieve 20% with steam Problems with unreacted bitumen in product wells

36 Prospects for Shell In Situ Upgrading Benefits: Process Heat transfer is slow but predictable Significant upgrading achieved Disadvantages High energy input for high T Simulations suggest 8:1 output/input ratio Need to run downhole heaters on cracked gases, not electricity

37 Conclusions Heavy oils are complex nanofluids Chemically complex asphaltenes Nano-aggregation behavior of asphaltenes dominates phase behavior and processing Example of catalysts for sulfur removal suggests a path forward Combine modern tools for imaging and computation Control nanoscale behavior Upgrading of heavy oils is advancing based on nanoscience 37

38 Acknowledgements Centre for Oil Sands Innovation at the University of Alberta Colleagues: Jacob Masliyah, H Yarranton (U of C), Zhenghe Xu Kuangnan Qian and Howard Freund (ExxonMobil) Student Arash Karimi 38

39 Society of Petroleum Engineers Join SPE!

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