REDUCING AXIAL WAVE REFLECTIONS AND IDENTIFYING STICKING IN WIRELINE CABLES

摘要

Techniques are described for axial vibration control of wireline tools and cables during logging operations. In undesirable cases the axial vibrations may lead to or exasperate the stick-slip problems of the logging tool. Control systems and strategies to minimize vibrations are described. Techniques are also described for identifying and inhibiting the sticking of the cable. A described system includes a surface actuator and a sensor. The actuator generates an axial wave on the wireline cable which travels down the cable. If there is sticking of the cable, a reflection can also occur at the location of sticking. This shift in the transmission of the wave on the wireline cable is used to identify the onset and/or presence of sticking.

主权项

1. A method of detecting sticking of a wireline tool cable deployed in a borehole, the method comprising:
deploying a wireline tool in a borehole using a cable; inducing an axial wave propagating along the cable; making measurements of the induced axial wave; and detecting a parameter relating to sticking of the cable within the borehole based at least in part on the measurements.