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The article describes the characteristics, features and methods of application of the latest (2014) development of NPF Geophysika JSC – fivesondes laterolog tool (5LL). Due to the complexity of the problems, before the development of the tool, together with Central Geophysical Expedition JSC we carried out a complete computer simulation of the developed sondes, the choice of the required sondes lengths, corresponding to a single vertical resolution and different depths of investigation for each sonde. Depth of investigations is selected in such a way as to allocate the radii of the invasion zone and to estimate the electrical resistivity of the unaffected part of the formation and the invasion zone. As a result, the developed tool allows to solve the same problems as foreign multisonde laterolog tools, such as Rtexplorer (Baker Hughes) and HRLA (Schlumberger), but has its own unique form of the sondes. A comparison of the characteristics and the actual logging curves developed tools and singlesonde laterolog tool K1-723 and the HRLA tool. The treatment of the indications of the curves of the 5LL tool and its functionality are demonstrated. On a real example the introduction of corrections for the influence of the borehole, conducting a point-by-point and interval valued solution of the inverse problem is shown. The solution of the inverse problem is implemented on the basis of introduction of amendments (three-layer chart curves), and on the basis of the full implementation of the inversion – computation of the synthesized curves in the model and their comparison with logging data, with subsequent refinement of the model. The misfit is calculated at each refinement of the model, as the degree of mismatch between the model solutions with well-logging curves. References 1. Klimenko V.A., Salakhov T.R., Yulmukhametov K.R., Electric multielectrode lateral logging tool (In Russ.), Karotazhnik, 2015, no. 11 (257), pp. 71–80. 2. Pantyukhin V.A., Dichenko V.G., Nigmatzyanov R.A., An EK-VR high-resolution electrical array logging tool (In Russ.), Karotazhnik, 2016, no. 9 (267), pp. 109–118. 4. Legendre E. et al., Better saturation from new array laterolog, Proceedings of SPWLA 40th Annual Logging Symposium: Conference Paper, Oslo, Norway, 30 May – 3 June 1999. 5. Maurer H. et al., Advanced processing for a new array laterolog tool, Proceedings of SPWLA 50th Annual Logging Symposium: Conference Paper, Woodlands, Texas, USA, 21–24 May 2009. 6. Smits J.W. et al., Improved resistivity interpretation utilizing a new array laterolog tool and associated inversion processing, SPE-49328-MS, 1998. 7. Liu C.R., Theory of electromagnetic well logging, Elveiser, 2017, 714 p. 8. Privalova O.R., Rezul'taty opytno-promyshlennykh rabot po vnedreniyu novoy apparatury GIS na mestorozhdeniyakh PAO “ANK “Bashneft'” v 2016 (The results of pilot works on the introduction of new GIS equipment at the fields of Bashneft ANK PJSC in 2016), Proceedings of XXIII International Scientific and Practical Conference “Novaya geofizicheskaya tekhnika i tekhnologii dlya resheniya zadach neftegazovykh i servisnykh kompaniy” (New geophysical equipment and technologies for solving problems of oil and gas and service companies), Ufa, 2017, pp. 22–23. 9. Kashik A.S. et al., Performance evaluation of the high-resolution multipole lateral logging tool and software package for processing its measurement results (In Russ.), Gaz. Neft'. Novatsii, 2016, no. 10, pp. 64–71. 10. Klimenko V.A., Software-and-methods set for evaluation of the electrical properties of the rock from five-sonde laterologs (5BK) (In Russ.), Karotazhnik, 2017, no. 7(277), pp. 134–142. |
