Abstract: This invention demonstrates an improved method of constructing an artificial lift device for deep wells, in which the deadload of the pump mechanism is supported by a continuously-controlled gas spring. The reciprocating motion is produced by a very unusual form of linear motor using a plurality of radially disposed conducting vanes and having no wire coils. The machine is highly efficient and is able to deduce many of the conditions obtaining at the pump by computations from the measured power demand at each point of the pumping cycle. The device is self-protecting and self-optimising.

Abstract: The invention relates to electric linear motors and gas springs in reciprocating pumps for oil wells. By the use of this invention a simple, silent, compact and adaptable mechanism can be constructed to drive a wide range of such pumps. The mechanism will sense a variety of pumping conditions and react automatically thereto.

Abstract: This invention demonstrates an improved method of constructing an artificial lift device for deep wells, in which the deadload of the pump mechanism is supported by a continuously-controlled gas spring. The reciprocating motion is produced by a very unusual form of linear motor using a plurality of radially disposed conducting vanes and having no wire coils. The machine is highly efficient and is able to deduce many of the conditions obtaining at the pump by computations from the measured power demand at each point of the pumping cycle. The device is self-protecting and self-optimising.

Abstract: A motion simulator in the form of a seat (11) comprising a seat support frame (12) including a seat back (13), in which a seat pan (19) is movably mounted with respect to the seat support frame (12) via motion actuators (20, 21, 22) which impart to the seat pan (19) motion with respect to the seat support frame (12) with at least three degrees of freedom including sway, and control means (34) for determining the motion of the actuators (20, 21, 22) to move the seat pan (19). Many cues involve moving the seat pan in the opposite sense from the simulated direction of movement.