Evaluating the applicability of mini-DST technology in an open hole for the study of Vendian-Cambrian carbonate reservoirs in Eastern Siberia

UDK: 622.
DOI: 10.24887/0028-2448-2020-12-86-90
Key words: formation tester tool, Eastern Siberia, geological prospecting work, Vendian-Cambrian system, open hole formation test, well test
Authors: T.S. Arbatskii (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), A.A. Shchurenko (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), I.A. Puzankov (Verkhnechonskneftegas JSC, RF, Irkutsk), I.R. Yamalov (Rosneft Oil Company, RF, Moscow)

Currently, among the specialists accompanying geological prospecting work in Eastern Siberia, the task of technological "re-equipment" is becoming especially urgent, including at the first stage pilot operations with modern equipment and an assessment of the applicability of the latter in the specific conditions of the geological section. At present, experience has been accumulated in conducting research on oil and gas objects throughout the license areas of the Irkutsk region. The share of research for 2017-2020 falling on the mini-DST + casing test complex, in relation to the total volume of exploratory drilling, is 65%. The mini-DST + casing test assumes preliminary open hole testing immediately after completion of drilling (classified as a special logging complex), followed by testing after casing and perforating the wellbore. Due to the presence of a special logging complex, the saturation estimate is refined by standard logging methods and, if there are fluid sections in the reservoir section, the testing strategy is adjusted. The full-scale complex of testing in a casing string means operational staging from secondary opening by perforation, preliminary stimulation of oil production (hydrochloric bath, acid treatment), long-term working out on chokes in free-flow production, etc. The standard layout of the considered formation testers is a modular assembly / instrument set. The main tools for well testing are the clamping probe arrangement and the dual packer / pumping module. The paper presents the results of determining the reservoir properties, reservoir pressure measurements, the quality of deep oil samples when testing carbonate reservoirs on drill pipes in an open hole and the data obtained by full-scale cased-hole well test complex. Comparison of these two methods results make it possible to assess the applicability and reliability of mini-DST for testing the geological and physical characteristics of complex oil and gas reservoirs of the carbonate type.


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