Currently, due to the depletion of oil and gas fields and their entry into the late stage of development, as well as due to the involvement in the development of more and more complex reservoirs, the drilling of horizontal wells is of high relevance. When solving the problem of horizontal wells geosteering there is a number of difficulties, the main of which are the geometric uncertainty in the geological structure of the formation in the direction of horizontal wellbore drilling, as well as the uncertainty in determining wellbore position relative to the formation boundaries. In this regard, there are risks of unstable argillites and coals entering the intervals, which can lead to emergency situations, as well as decrease efficiency of horizontal wells drilling. The small investigation radius of logging methods such as gamma ray, density, neutron porosity, and density image while drilling, as well as distance of logging measurement point to the bit, significantly reduces the efficiency of decision-making to change the wellbore trajectory in order to prevent entering the non-reservoir interval. Predicting the trend of the formation structure in advance, before formation change, makes it possible to make proactive decisions to change the wellbore trajectory in order to reduce the length of the drilling interval outside the reservoir. This makes it possible to increase well productivity at the drilling stage, significantly reduce the risk of exiting the target interval into unstable rocks and minimize losses during drilling a horizontal section of a well in a low-thickness reservoir. To achieve this goal, a technique for mapping contrasting boundaries with different electrical resistivity at a distance from the wellbore has been widely used. This method is based on the calculation of inversion from the measured readings of mid-depth probes of resistivity logging.
References
1. Aksel’rod S.M., Advance navigation in horizontal drilling (Based on foreign publications) (In Russ.), Karotazhnik, 2012, no. 9 (219), pp. 87–122.
2. Glinskikh V.N., Nikitenko M.N., Danilovskiy K.N. et al., Telemetric logging systems: software and methodological support in the process of drilling deviated-horizontal wells (In Russ.), Neftegaz.RU, 2017, no. 10, pp. 42–49.
3. Moskaev I.A., Danilovskiy K.N., Glinskikh V.N., Nikitenko M.N., Geonavigatsiya naklonno-gorizontal’nykh skvazhin po dannym vysokochastotnogo elektromagnitnogo karotazha v protsesse bureniya (Geosteering of deviated-horizontal wells according to high-frequency electromagnetic logging data while drilling), Proceedings of Trofimuk readings – 2017, Novosibirsk, 2017, pp. 261–264.
4. Shumikhin A.A., Sukhanov A.E., Primenenie geonavigatsii pri burenii v kollektorakh nebol’shoy moshchnosti (Application of geosteering when drilling in low-thickness reservoirs), Proceedings of All-Russian scientific and practical conference with international participation “Sovremennye tekhnologii izvlecheniya nefti i gaza. Perspektivy razvitiya mineral’no-syr’evogo kompleksa (rossiyskiy i mirovoy opyt)” (Modern technologies for oil and gas extraction. Prospects for the development of the mineral resource complex (Russian and world experience)), Izhevsk, 2016, pp. 314–325.
