4. Wells
  5. Packers or plugs
  6. With expanding anchor

Donald H. Perkins

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Ball valve structure

Valves and valve actuation – With means to increase head and seat contact pressure – Separate actuators or actuator motion
Patent

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Downhole reeled tubing inspection system with fiberoptic cable

Measuring and testing – Borehole or drilling – Downhole test
Patent

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Dual string well packer

Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent

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Electric surface controlled subsurface valve system

Wells – With electrical means
Patent

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Electric surface controlled subsurface valve system

Wells – With electrical means – Electrical motor
Patent

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Profile ID: LFUS-PAI-P-79701

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