Piston Design for Downhole Pulser

摘要

A measurement while drilling (MWD) tool includes a sensor, an encoder operably connected to the sensor and a pulser operably connected to the encoder. The pulser includes a linearly acting bidirectional piston that operates a poppet valve. The poppet valve is designed to completely or partially interrupt the flow of fluid through the MWD tool. The selective operation of the piston-driven poppet valve creates pressure signals that are carried through the fluid. The piston assembly that drives the poppet valves includes wear rings that improve the performance and durability of the piston.

主权项

1. An acoustic pulse generating component for use in connection with a downhole drilling tool, the acoustic pulse generating module comprising:
a piston assembly, wherein the piston assembly includes a piston having a wear ring; and a drive assembly configured to move the piston assembly.