The dynamometer testing system records dynagraphs, leakage curves (valve test) and measures a load on the polished rod without measurement recording.
A horseshoe transducer or a polished rod transducer is used for dynagraph recording. The polished rod transducer is attached to the polished rod and designed as a clamp with a clamping screw. The clamping screw serves for polished rod transducer quick installation without tightening torque adjustment. To record measurement results, it is enough to indicate two successive positions of the polished rod at the bottom dead centre. The transducer traces a change in the rod diameter under a variable load, thus determining a relative load variation on the rod. The rod position is calculated using the measured acceleration.
The polished rod transducer minimizes the examination time and covers a larger well stock, but along with these advantages, the polished rod transducer has some great disadvantages:
- The transducer cannot record absolute loads and movements.
- The load value is affected by the polished rod curvature due to misalignment of the wellhead equipment.
So, a horseshoe transducer is needed for recording a full-scale dynagraph. Special hydraulic cross-arm jacks make it much easier to install a horseshoe transducer. The jacks ensure smooth, shock-free separation and closing of the cross-arms and installation of the transducer.
The jacks neither release the cable hanger nor damage the polished rod.
The horseshoe transducer measures loads and movements in a direct way. After transmission to the computer, the resulting dynagraph allows performing a qualitative analysis of the equipment performance. Quality of a dynagraph obtained by the horseshoe transducer is in no way inferior to quality of this type of examination performed by the “QUANTOR-5Rshgn” diagnostic complex.