A DRILLPIPE ASSEMBLY AND A METHOD OF DEPLOYING A LOGGING TOOL

摘要

In the oil and gas well data logging industry there is a need for an improve d apparatus and method for deploying a so-called compact battery / memory logging tool, for acquiring data in deviated or horizontal wells. A drillpipe assembly (10) includes a drillpipe (11) having secured at a downhole end thereof a delatching latching sub (12) containing an extendable running sub (13) supporting a battery / memory logging tool (14). The running sub (13) occupies an initial, retracted position during deployment of the drillpipe (11), whereby the logging tool (14) is protected within one or more drillpipe stands. The running sub is moveable by a messenger (26) to a second, extended position in which its logging tool (14) protruding from the drillpipe (11). The drillpipe assembly may therefore be used to protect the logging tool (14) during running in operations; and then to extend the logging tool to permit commencement of logging operations.