| 摘要 |
<p>A differential pressure device installed in a side pocket tool (146) for use in a borehole where a differential pressure (P1, P2) is converted into a linear motion by a main bellows (62) and this main bellows is connected by a linear to rotative force device or torque converter (86) to develop a torque force about the torque axis (44). A second bellows (80) is used as an interior, control bellows for limiting the differential pressure applied to the exterior of main bellows (62) so that overpressure will not destroy either bellows. The torque force is applied to a torque responsive pressure device (146) to develop a pressure signal. The tool is preferably used in a side pocket mandrel (140), and the pressure signal measurements that allow determination of flow rate by standard hydraulic equations can be recorded downhole by a memory recorder (144) or else transmitted to the earth's surface for real time recording.</p> |
