| 摘要 |
A means to transmit recorded data through a fluid medium, the preferred embodiment incorporates a positive displacement fluid pump (10) having constant pressure pumping means (12) connected to pump fluid through a drill string (13) for drilling oil wells. A variable orifice means (27) is located down hole in the drill string (13) which changes orifice diameter responsive to recorded signals. The pumped fluid is displaced by a pumping piston (20) driven by a second piston (31) which is powered by constantly pressured hydraulic fluid. The pumped fluid is held at a constant pressure, therefore a change in orifice (27) diameter will change the volume of the flow through the orifice and thereby change the volume of flow of the hydraulic drive fluid. The flow rate of the hydraulic drive fluid is thus gauged to thereby record orifice diameter change and in turn receive signals transmitted by the change in orifice diameter. |
