A Novel Approach to Wireline Logging in Directional Wells and Difficult LoggingConditions

摘要

Conventional wireline logging has always faced the challengernof obtaining data in highly deviated wells, horizontal wells andrnthose with bad hole conditions. Typical solutions includedrnpumping down tools through open end drillpipe, drillpipernconveyed wireline logging, coiled tubing conveyed wirelinernlogging or ultimately Logging-While-Drilling. Thesernoperations are time consuming and costly.rnA new openhole memory logging system was introduced inrn2000, initially as a more efficient alternate to pipe conveyedrnlogging in such wells. Extensive field-testing of this systemrnover the last few years has yielded a series of technicalrndevelopments that has evolved into a low cost and uniquernformation evaluation logging system. This system combinesrnmemory logging with a novel deployment system that yields arncost effective approach to obtaining high quality formationrnevaluation data. Obtained post-drilling, the shuttle systemrnconveys memory logging tools rapidly to TD inside therndrillpipe as part of a wiper trip or check trip.rnLogging tools used in this system are designed to be extremelyrnshort and small diameter (2.25”). The system is batteryrnpowered and includes a wide variety of capabilities includingrnquad-combo measurements and, in the near future, repeatrnformation pressure testing. Logging tools are conveyed to TDrninside the drillpipe. Once at TD, an electro-mechanicalrnpressure activated release mechanism moves the tool stringrnfrom inside the drillpipe into the openhole. A landing collarrnand latch mechanism maintains a mechanical connectionrnbetween the top of the tool string and the shuttle system thatrnremains connected to the drillpipe. A pressure signalingrnsystem not only controls the tool release but also providesrnsimple two-way communications – a key element in providingrnreal-time QA in the memory repeat formation pressure testerrnoperations. Examples will be shown where these systemsrnhave demonstrated to be cost effective.