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Archive » Abstracts » Search	*2004/ 2005 SEASON* **STAVANGER MARCH MEETING Venue: Rica Forum Hotel, Stavanger Date: Wednesday, 2nd March, 2005 Time: 11:00 a.m. Lunch will be provided at 12:00** Magnetic Resonance While Drilling For Everyday Petrophysics Thomas Kruspe , Roland Chemali, Angela Durkin Baker Hughes INTEQ Abstract Magnetic resonance logging was originally invented for measuring fluid filled porosity, and for differentiating between producible and non-producible fluids. Early tools, however, came with special operational requirements. Wireline logs were slow and sensitive to wash-outs; LWD logs did not tolerate tool vibrations. Both required a good deal of preplanning to accommodate limited capability hardware. By returning to basics we were able to design a new LWD magnetic resonance tool tolerant to vibration. The new device acquires T2 under normal drilling conditions with standard operating practices. This was made possible by a short inter-echo spacing, by special stabilizers, and by a low gradient field. Because of this low gradient field the tool measures directly intrinsic T2, leading to a visual identification of light hydrocarbon with no diffusion effect. The new sensor operates with minimal preplanning and requires little to no interference with the drilling process. The new LWD magnetic resonance tool measures directly total fluid filled porosity, independently of lithology, without radioactive sources. In shaly sand it also determines effective porosity and free and bound fluid. In a recent comparison with wireline in a sand shale sequence we overlay the porosity determination from nuclear porosity tools with that read directly from LWD magnetic resonance. Agreement is achieved after we correct the density-neutron porosity with petrophysical data from local knowledge, based on cuttings and on cores. About the presenter:* Thomas Kruspe is Project Manager for “MagTrak- MR while drilling “ in the Celle Technology Center of Baker Hughes INTEQ. He graduated in mechanical engineering at the Technical University of Dresden. He received his PhD in 1991. He worked in different positions in the research and development arena. He has co-authored over 20 papers and patents about drilling and formation evaluation.

Abstract

Magnetic resonance logging was originally invented for measuring fluid filled porosity, and for differentiating between producible and non-producible fluids. Early tools, however, came with special operational requirements. Wireline logs were slow and sensitive to wash-outs; LWD logs did not tolerate tool vibrations. Both required a good deal of preplanning to accommodate limited capability hardware.

By returning to basics we were able to design a new LWD magnetic resonance tool tolerant to vibration. The new device acquires T2 under normal drilling conditions with standard operating practices. This was made possible by a short inter-echo spacing, by special stabilizers, and by a low gradient field. Because of this low gradient field the tool measures directly intrinsic T2, leading to a visual identification of light hydrocarbon with no diffusion effect. The new sensor operates with minimal preplanning and requires little to no interference with the drilling process.

The new LWD magnetic resonance tool measures directly total fluid filled porosity, independently of lithology, without radioactive sources. In shaly sand it also determines effective porosity and free and bound fluid. In a recent comparison with wireline in a sand shale sequence we overlay the porosity determination from nuclear porosity tools with that read directly from LWD magnetic resonance. Agreement is achieved after we correct the density-neutron porosity with petrophysical data from local knowledge, based on cuttings and on cores.

About the presenter:

Thomas Kruspe is Project Manager for “MagTrak- MR while drilling “ in the Celle Technology Center of Baker Hughes INTEQ. He graduated in mechanical engineering at the Technical University of Dresden. He received his PhD in 1991. He worked in different positions in the research and development arena. He has co-authored over 20 papers and patents about drilling and formation evaluation.