Downhole pressure measurements are provided by Sperry Drilling Services' PWD service, which consists of high-accuracy quartz pressure gauges measuring annular and bore pressure.The PWD data have a number of valuable applications, including:

Accurate downhole measurement of equivalent circulating density (ECD)

Kick detection, including shallow water flows

Swab/surge pressure monitoring while tripping and reaming

Monitoring of hole cleaning

Accurate downhole measurement of hydrostatic pressure and effective mud weight

Accurate leak-off test (LOT) and formation integrity test (FIT) data without circulating to condition the mud.

This sensor also exists in sensor high temperature/high pressure versions.

 

 

 

Drillstring Dynamics subs is run during drilling. Analysis of data from these widely sensors clearly showed that torsional vibration is transmitted along the drillstring with very little attenuation. An important effect of torsional vibration is lateral vibration, which can be initiated during the slip phase of stick-slip as the bit and BHA spin freely at several times the surface RPM. The data analysis suggests that lateral shocks associated with stick-slip are most likely responsible for the downhole tool and component failures. Also, high torque in the drillstring during torsional vibration probably contributed to drillpipe. The data of sensors led to recommendations to the operator that have been effective in reducing harmful vibrations and in improving the performance of BHA components.