1. Overview Seven Parameters Combination Production Logging Tool is mainly applied in oilfield production and development.With high temperature & pressure resistance, it is widely applied in offshore and onshorewell logging where the temperature is less than 175°C and the pressure is less than 80 MPa. The instrument adopts single core battery and telemetry mode, and telemetry position indicator, temperature & pressure gauge, flowmeter, water holdup meter and gamma tool can be joined.The gamma ray strength, casing joint, downhole fluid temperature, pressure, flow, density and water holdup can be acquired by one downhole trip. The combination tools can be selectable according to actual well logging. 2. Working Principle Seven Parameters Combination Production Logging Tool adopts telemetry mode, single core battery, 5.729 bps rate. The telemetry position indicator sends addresses to the other downhole tools; the other tools will send data back to telemetry position indicator after their own addresses received. The telemetry position indicator then sends the data which is combined and encoded by Manchester Encoding method to surface control system.