Abstract: A choke that is usable with a well includes an inlet port and an outlet port. The choke also includes pressure drop stages between the inlet port and the outlet port. Each of the pressure drop stages is adapted to create part of an overall pressure differential between the inlet and outlet ports.

Abstract: A choke that is usable with a well includes an inlet port and an outlet port. The choke also includes pressure drop stages between the inlet port and the outlet port. Each of the pressure drop stages is adapted to create part of an overall pressure differential between the inlet and outlet ports.

Abstract: A technique is provided to control flow in a well. A well completion comprises one or more flow control valve systems coupled by an electric line and a hydraulic line. Each flow control valve system comprises a flow control valve responsive to hydraulic input via the hydraulic line and an electro-mechanical device. The electro-mechanical device is responsive to inputs via the electric line and is used to control hydraulic input to the corresponding flow control valve.

Abstract: A choke that is usable with a well includes an inlet port and an outlet port. The choke also includes pressure drop stages between the inlet port and the outlet port. Each of the pressure drop stages is adapted to create part of an overall pressure differential between the inlet and outlet ports.

Abstract: To assemble a well tool, an inventory of plural different types of functional modules is maintained at an assembly location. An order for a well tool having a specified first application is received. In response to the order, a first combination of the plural types of functional modules from the inventory is assembled to form the well tool.

Abstract: A choke that is usable with a well includes an inlet port and an outlet port. The choke also includes pressure drop stages between the inlet port and the outlet port. Each of the pressure drop stages is adapted to create part of an overall pressure differential between the inlet and outlet ports.

Abstract: A technique is provided to control flow in a well. A well completion comprises one or more flow control valve systems coupled by an electric line and a hydraulic line. Each flow control valve system comprises a flow control valve responsive to hydraulic input via the hydraulic line and an electro-mechanical device. The electro-mechanical device is responsive to inputs via the electric line and is used to control hydraulic input to the corresponding flow control valve.

Abstract: This invention relates to a photovoltaic system comprising a casing having mounted therein a plurality of solar cells. The casing has a front and opposite thereto, a rear. The front of the casing is provided with a light-transmitting panel for transmitting solar light to the solar cells. The rear is a double wall. A first wall is in contact with the back of the solar cells, and on its side away from the solar cells is of a dark-opaque color, i.e. a solar light absorbing surface. The second wall is a light-transmitting enclosure of the dark-opaque colored side of the first wall, but spaced therefrom so as to produce a greenhouse effect.