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The algorithm and software module development for automatic analysis of convergence and quality of gamma-ray logging data during geosteering

UDK: 681.518:550.832
DOI: 10.24887/0028-2448-2020-11-48-50
Key words: geosteering, horizontal wells, gamma-ray logging, automation
Authors: A.V. Galkina (IGiRGI JSC, RF, Moscow), M.Yu. Lisitsyna (IGiRGI JSC, RF, Moscow), T.R. Rakhimov (IGiRGI JSC, RF, Moscow), D.A. Filatov (IGiRGI JSC, RF, Moscow), V.P. Filimonov (Rosneft Oil Company, RF, Moscow)

Today, production drilling is the main factor in maintaining oil production in the oil and gas industry. In the recent years, there has been a significant increase in the volume of drilling high-tech wells (horizontal, multilateral, extended reach), which is associated with the involvement in the development of new fields, areas with more complex geology in mature fields and fields with hard-to-recover reserves. The contribution to production from high-tech wells is also increasing. This article considers the results of creating an algorithm and a software module that allows determining the convergence and quality of logging curves in real-time. The reason for the shift between the main logging curve and its rewriting may be the wrong measure of the drilling tool when changing its part in the BHA or in the drill plug. Another reason might be the incorrect determination of the drilling tool collars position during round-trip operations. The software developed by Rosneft Oil Company, receiving as input gamma-ray logging data obtained during the drilling and real-time logging rewriting, subject to sufficient convergence of curves and high data quality, allows obtaining information about the presence of a shift within only several tens of meters of rewriting. This module is an assistant to a geosteering engineer and is aimed at increasing the efficiency of the geosteering process and reducing the cost of well construction.

References

1. Gromyko G.L. et al., Teoriya statistiki (Theory of statistics): edited by Gromyko G.L., Moscow: INFRA-M Publ., 2009, 474 p.

2. Ilyshev A.M., Shubat O.M., Obshchaya teoriya statistiki (General theory of statistics), Moscow: KnoRus Publ., 2013, 432 p.

Today, production drilling is the main factor in maintaining oil production in the oil and gas industry. In the recent years, there has been a significant increase in the volume of drilling high-tech wells (horizontal, multilateral, extended reach), which is associated with the involvement in the development of new fields, areas with more complex geology in mature fields and fields with hard-to-recover reserves. The contribution to production from high-tech wells is also increasing. This article considers the results of creating an algorithm and a software module that allows determining the convergence and quality of logging curves in real-time. The reason for the shift between the main logging curve and its rewriting may be the wrong measure of the drilling tool when changing its part in the BHA or in the drill plug. Another reason might be the incorrect determination of the drilling tool collars position during round-trip operations. The software developed by Rosneft Oil Company, receiving as input gamma-ray logging data obtained during the drilling and real-time logging rewriting, subject to sufficient convergence of curves and high data quality, allows obtaining information about the presence of a shift within only several tens of meters of rewriting. This module is an assistant to a geosteering engineer and is aimed at increasing the efficiency of the geosteering process and reducing the cost of well construction.

References

1. Gromyko G.L. et al., Teoriya statistiki (Theory of statistics): edited by Gromyko G.L., Moscow: INFRA-M Publ., 2009, 474 p.

2. Ilyshev A.M., Shubat O.M., Obshchaya teoriya statistiki (General theory of statistics), Moscow: KnoRus Publ., 2013, 432 p.



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