Geological modeling of Reservoir P of the Vogulkino thickness at the Kayumovskoye oil field and specifics of reserve recovery using sidetracks from transit wells

UDK: 519:868:55

DOI: 10.24887/0028-2448-2026-3-31-34

Key words: geological modeling, oil and gas reserves, drilling, side shafts, drilling mud, nanoafron

Authors: T.N. Ivanova (Udmurt State University, RF, Izhevsk; Tchaikovsky branch of Perm National Research Polytechnic University, RF, Tchaikovsky); G.O. Makarov (Udmurt State University, RF, Izhevsk)

The calculation of oil and gas reserves is strategically important for the country. One of the ways to perform it is geological modeling, which is carried out using the example of the P stratum of the Vogulkin formation of the Kayumovsky oil field, located in the Kondinsky district of the Khanty-Mansiysk Autonomous Region. The field was discovered in 1971, and the development began from the upper part of the Pre-Jurassic deposits of the KV stratum in 2005. In 2008, 2D and 3D seismic surveys delineated and detailed the P stratum located under the KV stratum. The geological reserves of oil and dissolved gas categories were calculated and approved for the field, and the oil recovery coefficient equals to 0,4. Eight complex uneven oil deposits were identified within the P stratum. The total oil-bearing area of the reservoir is 82520 thousand m2 with a depth of 2071 to 2407 m. The Kayumovsky oil field is recognized as unprofitable. After analyzing the stages of development of the P stratum, geological models of the Upper Jurassic sediments were constructed and the initial geological/recoverable reserves of oil and dissolved gas were clarified. It is proposed to drill the promising western deposit of the Vogulkin formation of the Abalak suite with horizontal sidetrack wells with a new water-based drilling fluid with nanoafrons to ensure the well walls stability. According to the drilling results, the increase in reserves in category B1 will amount to 18 % relative to accepted reserves.

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