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Кубышко - нефте-газо

III. Complete the sentences

  1. Both oil and gas reservoirs start with ….

  2. In nearly all crude oil fields less then one third of the oil originally present can

be produced using ….

  1. An injected fluid replaces the produced oil and thus maintains ….

  2. Another secondary recovery method is ….

  3. Several recent methods for secondary recovery involve the application of heat to the reservoir to make ….

  4. The heat thus generated makes the oil ….