In order to make informed decisions and optimize the behavior of downhole tools, a technology based on pressure wave has been put forward to communicate the downhole tool from surface. The key enabling for downlink communication is real-time telemetry of data from surface to bottom tool assembly. This process involves of establishing mathematical models of pressure wave data transmission, encoding and decoding the pressure wave signals and developing a downhole communication processing system. According to field test and production test, the wireless control downhole throttle has been successfully operated along with pressure wave telemetry. The pressure wave communication technology takes advantages of the control valves in ground production manifold to pre-program wave signals. The wave signals are encoded by the variation of pressure and transmitted to the downhole control system where the signals will be decoded as executive command to downhole tools. The practice shows that this technology provides a simple and reliable mode of communication for gas production and development. And it also has a bright future of application and dissemination in wellbore control of gas well.
