Operational quality control of mudlogging data during geosteering of horizontal sidetracked wells

UDK: 622.24.002.2

DOI: 10.24887/0028-2448-2026-6-44-48

Key words: gas logging, mud logging, drilling, data quality

Authors: L.S. Redina (Branch of RN-GRD LLC in Moscow – Technical Competence Center IGiRGI, RF, Moscow); S.A. Nikiforov (Branch of RN-GRD LLC in Moscow – Technical Competence Center IGiRGI, RF, Moscow); A.R. Ganiev(RN-TECHNOLOGIES LLC, RF, Moscow); V.P. Filimonov (Rosneft Oil Company, RF, Moscow); A.S. Enin (Rosneft Oil Company, RF, Moscow)

The main task of mud logging directly while well drilling include accurate and timely identification of reservoirs and the assessment of their saturation. The data provided by mud logging are an important source of information for real-time decision-making, particularly in the precise adjustment of well trajectories within the framework of geosteering. Given that these operations are conducted in a strictly real-time and operational environment, timely assessment of data quality becomes essential. To address this need and enhance the credibility of the mud logging information, this paper presents a developed system of quantitative criteria for the operational assessment of mud logging data quality. This system was designed to methodically verify compliance with gas logging standards, ensure the consistency and detail of cuttings descriptions, and to control the accuracy of key technological parameters. The proposed approach characterized by its numerical grading system and methodological universality, making it suitable for scalable implementation and integration into automated data processing workflows. The criteria were tested on mud logging datasets acquired from both terrigenous and carbonate reservoirs across oil and gas fields in Western and Eastern Siberia. This pilot testing confirms the practical applicability and efficiency of the system by enabling a rapid and unified assessment of data quality accessible not only to specialized mud logging analysts but also to specialists in other areas of oil and gas industry.

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