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Systems Model and Offshore Oil

Systems Model and Offshore Oil. Offshore Oil: Decision to Recover. The determination must be made whether cost of inputs and processing will be offset by the value of the output oil. There are several factors that affect the profitability of oil production .

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Systems Model and Offshore Oil

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  1. Systems Model and Offshore Oil

  2. Offshore Oil: Decision to Recover • The determination must be made whether cost of inputs and processing will be offset by the value of the output oil.

  3. There are several factors that affect the profitability of oil production. Production can not proceed unless the company has a good expectation of making a profit. Oil Price – Cost of Production = Profit

  4. Physical Factors Affecting Recovery • Ocean related factors include; • Ocean Depth , Ocean currents, Icebergs & Pack ice • Climate/weather related factors include; • Wind speeds, Storms, Waves • Oil Related factors include;  • Size of the reserve, Oil quality • Environmental protection factors;  • Other resources like fish stocks, marine mammals, and spawning grounds would be affected in the event of an oil spill.

  5. Worker Safety How safe can the drill rig and production platform be for the workers? Financial Factors include: cost of inputs - building a rig to withstand icebergs, hurricane winds, or to drill at great depths. cost of processes– extracting the oil, transporting the oil from off-shore to land, or maintaining equipment. price of oil which is set, but can change and then you determine if enough money is recovered from the oil to exceed the cost of production. Human Factors Affecting Recovery

  6. Offshore Oil: Decision to Recover The main determinate is… … whether the cost of overcoming all other factors will be offset by the price oil can be sold for and make the venture financially viable!

  7. A Brief History of Oil Recovery Keeping the Connection to Land ~ In the 1860’s wharves were built extending 365m out into the ocean to facilitate ocean drilling off California.

  8. A Brief History of Oil Recovery Letting go of Shore ~ In the 1920’s a drill rig was built on wooden pilings in lake Maracaibo, Venezuela.

  9. A Brief History of Oil Recovery Moving to Steel ~ In the 1930’s a drill rig was built on steel structures in the Gulf of Mexico but it was limited to 7m of water or less.

  10. A Brief History of Oil Recovery Letting go of the Ocean Floor • In 1956, the first drill ship was built allowing drilling in deeper water. • These types of drill ships allowed exploration off the shores of Newfoundland.

  11. Drill Ships

  12. Off-shore Oil Rigs Modern Drill Rigs (Pg. 186 - Figure 11.4) • Submersible Rigs • Jack-up Rigs • Semi-submersible Anchored rigs • Semi-submersible Dynamically Positioned

  13. Submersible Rigs Fixed columns ground them on the ocean floor! • Usually limited to ocean depths of 20 m. For this reason they are limited to continental shelves, relatively close to shore. • The rigs are floated as they are towed to drill site. Once in position ballast tanks are flooded until columns rest on ocean floor.

  14. Submersible Rigs

  15. Jack-Up Rigs • Extendable legs ground them on the ocean floor. • Are limited to a maximum ocean depth of 100 m. • The jack-up is similar to the submersible in that it rests on the ocean floor. • However its steel legs (Not columns) rest on ocean floor.

  16. Jack-Up Rigs

  17. Semi-Submersible Anchored Rigs • Limited to a max. ocean depth of 200 m. • Built on land, then flooded and towed to the drill site. • Water is pumped in and out of ballast tanks to keep stability along with anchor lines. • Oil is stored in pontoons until shipped on-shore. • Float BUT are anchored above the drill site.

  18. Semi-Submersible Anchored Rigs

  19. Use thrusters to keep position above the drill site. Able to drill outside the continental shelf. Still limited to a max. ocean depth of 2000 m. Like other rigs they are towed to the drill site. Water is pumped in and out of ballast tanks to help stability (NO anchor lines). Like the Anchored rigs oil is stored in pontoons until shipped on-shore. Note: dynamic means changing or moving. Semi-submersible Dynamically Positioned

  20. thrusters Semi-submersible Dynamically Positioned

  21. Semi-submersible Dynamically Positioned Eirik Raude - The World’s largest self-propelled, semi-submersible, all weather oil drilling rig. 

  22. Hibernia Case Study • Pg. 187-191

  23. Directional Drilling • Figure 11.5 on page 187 of your text. This technique: • A. increases the drill holes exposure to source (porous) rock. • B. allows drill companies to reduce movement from one small oil pocket to the next.

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