Patent ID: 6288548
Filing Date: 2001-09-11
Classification: G01V

Abstract:
A measurement-while-drilling (MWD) apparatus for use with a drillstring during drilling operations for obtaining information about a parameter of interest, comprising:(a) a measurement tubular that includes a central bore that communicates with a central bore of said drillstring;(b) a measurement sonde located within the measurement tubular for obtaining measurements on the parameter of interest, said measurement sonde including:(i) at least one transmitter for inducing an electromagnetic signal in the formation through the measurement tubular, and(ii) at least one receiver for receiving the induced electromagnetic signal in the formation through the measurement tubular; and(c) a retrieval member on the measurement sonde adapted to facilitate an operation selected from (i) retrieval of the measurement sonde from the measurement tubular during drilling operations, and, (ii) placement of the measurement sonde within the measurement tubular during drilling operations.