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For utilization and geographic location, ODS-Petrodata''s November Offshore Rig Locator shows 264 jackups working, out of a total worldwide fleet of 388 rigs, for 68% utilization, down from 82% one year ago. This is principally due to sharp cuts in the U.S. Gulf of Mexico, where only 72 of 150 available units were working due to lower oil/gas prices. The second most active area was the Persian Gulf, with 46 of its 56 rigs working. The North Sea/NW Europe had all but one of its 34 jackups working. Asia accounted for 60 rigs--in India, 16 of 20 units were working; SE Asia had 19 of its 22 rigs active; and the Far East saw 11 of its 18 jackups working. West Africa was working 19 of its 23 rigs. Other active areas included: the Mediterranean/Black Sea, 10 of 12; Red Sea/Gulf of Suez, 11 of 11; and South/Central America, 18 of 25. The path of fuel flow through the system is pretty simple. Diesel fuel tanks normally are positioned above the engine''s fuel-injection pump to provide a positive pressure head to the fuel filter and transfer pump. This positioning assures easy priming of the system and assists fuel flow as the filters become more restricted. The fuel is moved by the transfer pump (usually a diaphragm type).The transfer pump, normally with the help of gravity, pulls the fuel through a primary filter and pushes it through a secondary filter before the fuel reaches the main pump. When a camshaft lobe in the injection pump lowers the plunger, the transfer pump pushes fuel into the chamber above the plunger in proportion to the position of the metering system. As the engine camshaft rotates, the injection pump plunger rises, pushing the fuel at high pressure out of the delivery valve, into the high-pressure fuel lines, and on to the injector nozzle. The high-pressure fuel inside the injector nozzle surrounds the valve (piston) and pushes up on the piston step against a predetermined spring setting. As the piston lifts, fuel leaves the nozzle tip and flows out the nozzle orifice into the pre-combustion chamber or cylinder.
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