Patent ID: 7178608
Filing Date: 2007-02-20
Classification: E21B,G01V

Abstract:
1. A while drilling system for determining downhole parameters, the system positioned in a downhole drilling tool suspended in a wellbore, the system comprising: a retrievable while drilling tool positionable in the downhole drilling tool, the while drilling tool having a first communication coupler at an end thereof; a sensor chassis supported in the drilling tool, the sensor chassis having a second communication coupler at an end thereof for operative connection with the first communication coupler; and at least one sensor positioned in the chassis, the at least one sensor adapted to measure one of internal parameters of the drilling tool, external parameter in the wellbore and combinations thereof, the sensor operatively connected to the while drilling tool via the communication coupler for communication therebetween, wherein the at least one sensor comprises one of an internal pressure sensor, an external pressure sensor and combinations thereof.