Pressure Activated Deployment of Openhole Memory Logging Tools Into Directional Wells and Past Bad Hole Conditions

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractOpenhole memory logging was introduced in 2000, initially as a more efficient alternative to pipe conveyed quad-combo wireline logs in high angle and horizontal wells and wells with bad hole conditions. By 2001 a range of deployment techniques had been developed that provide high-quality, lowcost, post-drilling formation evaluation logs to supplement basic real-time data (such as navigation and gamma ray). Among the new techniques is a shuttle system that conveys memory tools rapidly to TD inside drillpipe, ideally as part of a wiper or check trip. In one manifestation a dart pumped from surface releases the logging string after the assembly reaches TD, then moves the string from the drillpipe into open hole. This variant has been successful in over 350 wells. In a new development the dart has been eliminated, replaced by an electro-mechanical pressure activated release mechanism that eliminates the dart pumping time, has better power management for longer operations, and is capable of simple two-way communications -a key element in a repeat formation pressure tester being developed for memory operations. A slim variant operates in wells down to 4¼inches bit size.