Summary A mechanism for conveying logging tools inside drillpipe has been developed that reduces the risk and cost of acquiring openhole formation evaluation data in high-angle wells and bad hole conditions. The measurement string is housed inside drillpipe, where it is protected while running in, and pumped into open hole close to final depth. Wireline tools are used for data-quality reasons, but the wireline has been eliminated, giving time, access, and well-control advantages relative to wireline pipe-conveyed logging (PCL). It is an alternative to the formation evaluation element of logging while drilling (FE-LWD), where steering decisions do not rely on real-time petrophysical analysis, particularly when the risk to the bottomhole assembly (BHA) is high. The system's ability to acquire data while conditioning the hole contributes to its efficiency and is advantageous in bad hole conditions. A 1.4-km horizontal test loop was constructed to help develop and prove the tool deployment and signaling mechanism. Insights gained during this process resulted in the development of novel payload delivery seals—key components in the system. Formation evaluation data have been acquired in 220 wells; they include horizontal wells for which other logging solutions are unattractive for reasons of accessibility and/or cost. Knowledge gained from the interpretation of these data sets has influenced completions in some wellbores and guided remedial action in others.
fax 01-972-952-9435. AbstractOpenhole memory logging was introduced in 1999 as a more efficient alternative to pipe conveyed wireline logging. It was developed subsequently into a shuttle system that conveys logging tools inside drillpipe, and which provides formation evaluation logs after drilling to supplement basic real-time logging-while-drilling (LWD) data. The original shuttle design used a dart pumped from surface to move the logging string into open hole after the assembly reached TD. In a new development, the dart has been eliminated together with the associated pumping time. In its place is an electro-mechanical pressure activated release mechanism capable of simple twoway communication. The method has been used in trials to activate and deploy logging tools downhole, and to return status information to surface. It has the potential to be developed further for post-drilling real-time data transmission, and is a key component in a repeat formation pressure tester being developed for memory operations.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA mechanism for conveying logging tools inside drill pipe has been developed that reduces the risk and cost of acquiring open hole formation evaluation data in high angle wells and bad hole conditions. The measurement string is garaged inside drill pipe where it is protected while running-in, being released into open hole close to final depth. Wireline tools are used for data quality reasons, but the wireline has been eliminated, giving time, well access and well control advantages relative to wireline pipe conveyed logging. Over shallow, long horizontal intervals the time savings are substantial because wireline re-latching is eliminated, and pipe is run-in at tripping speed. The ability to circulate over and around the tools means that logging and hole cleaning trips can be combined to give further time reductions. Cost and data quality advantages have been demonstrated relative to logging-while-drilling in wells where real-time formation evaluation data is not used to guide the drilling process.A 1.4-Km test loop constructed during the development phase proved the tool deployment sequence can be controlled and monitored using mud pressure. It enabled the design to be refined before being run in real well environments, and resulted in the development of novel payload delivery seals -a key component in the system.Using the new method, formation evaluation data has been acquired in horizontal wells that would not have been logged previously for reasons of accessibility and/or cost. Knowledge gained from the interpretation of these data sets has influenced the installation of completions in new wellbores, and guided remedial action in others.
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.
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