Abstract: This invention relates to a data communication system/method for use in a downhole application wherein electrical energy is supplied over a multiple-conductor power cable to a motor assembly of a downhole tool such as an electric submersible pump. A power leg coupling interfaces a surface controller of a downhole instrument to the conductors of the tool's power cable. Uplink communication of telemetry data occurs via current modulation generated by the downhole instrument and interpreted by a surface controller. Downlink communication of downhole instrument data occurs over a different communication scheme supported by the downhole and surface controllers. Downlink communication scheme provides a supply of power to the downhole instrument. Protection of downhole electronics and continuity of communication is ensured in the event of a ground fault on the power cable. Both downlink and uplink communication frequencies are adaptive based on frequencies and voltages present on the power cable.

Abstract: This invention relates to a data communication system/method for use in a downhole application wherein electrical energy is supplied over a multiple-conductor power cable to a motor assembly of a downhole tool such as an electric submersible pump. A power leg coupling interfaces a surface controller of a downhole instrument to the conductors of the tool's power cable. Uplink communication of telemetry data occurs via current modulation generated by the downhole instrument and interpreted by a surface controller. Downlink communication of downhole instrument data occurs over a different communication scheme supported by the downhole and surface controllers. Downlink communication scheme provides a supply of power to the downhole instrument. Protection of downhole electronics and continuity of communication is ensured in the event of a ground fault on the power cable. Both downlink and uplink communication frequencies are adaptive based on frequencies and voltages present on the power cable.

Abstract: A locking assembly, used for moving articles between a fully retracted position and a fully extended position, comprises, a stationary slide member, an intermediate slide member slideably connected to the stationary slide member, a load-carrying slide member slidably connected to the intermediate slide member for sliding movement relative to the intermediate slide member, and a locking lever rotatably coupled to the load-carrying slide member. The locking lever including an outer grip portion, and a locking portion for locking the load-carrying slide member to the stationary slide member to prevent relative movement between the load-carrying slide member and the stationary slide member when the assembly is fully retracted position, and a ramp portion for preventing the locking portion from locking the load-carrying slide member to the intermediate slide member in response to movement of the load-carrying slide member relative to the intermediate slide member.