Abstract

The paper demonstrates relevance of research performed by top-level scientists and R&D efforts aimed at development of innovative solutions that are successfully used in well drilling. The paper analyzes modified arrangements of core samplers used during well drilling, named “Nedra”, “Silurian”, “Cambrian”. In all core samplers, core is generated by a core-drilling bit with hard-alloy teeth. The paper discusses the results of core recovery operations in South-Western Uzbekistan. It analyzes core recovery with various core samplers and presents the results of core recovery with a new core drilling bit named “6LBK-MSZ”.
Based on the analysis of the existing core drilling bits, innovative solutions have been applied in the research. To preserve core and provide maximum core recovery from incompetent rocks, a new six-point scraping-cutting core drilling bit has been developed named “6 LBK 187.3/80 МSZ”. To test these new bits and core sampling procedure, prototype models were made in IGIRNIGM Joint-stock company. Pilot testing was carried out in Well No. 1 of Koncha Area in Zarafshansky region. With axial weight on 6LBK drill bit (WOB), core recovery made 60-100%, which can be deemed as a satisfactory result.
The results of the research are presented as characteristic curves. These curves show that increase in axial weight on drilling bits of 6VK-SZ and 6LBK-MSZ types over 2 tons results in core recovery impairment. In case of 2-2.5 tons WOB core recovery made 60-100%, while in case of higher WOB core recovery made 30-40%. Hence, optimum WOB is within 2 tons.
Relationships have been established between core recovery and rotary speed when using 6LBK-MSZ drilling bit. Core recovery appeared to be 75-100% at 35-50 rpm which is good performance.
Relationships have been established between flow rate and core recovery. The cross-plot shows that in case of flowrate increase up to 8 l/s, core recovery with 6LBK-MSZ core-drilling bit grows to 100%, while with 6VK-SZ drilling bit it decreases. In case of core sampling using 6LBK-MSZ core-drilling bit core recovery made 70-100% at pumping rate of 7-10 l/s.
Based on the actual data and the results of pilot testing of 6VK-SZ and 6LBK-MSZ drilling bits, the paper presents findings and recommendations for using 6LBK 187.3/80 MSZ core-drilling bit.
According to the recommendations elaborated by the authors, production of core samplers, core drilling bits and core holders under the Government programs of output product nationalization will enable substituting imported products and saving foreign currency.
Developed innovative solutions will improve the efficiency of oil and gas prospecting during well drilling.

Key words:

core, innovative solution, well drilling, core sampler, core drilling bit, Koncha area, sediments, South-Western Uzbekistan, import-substituting products 

References

Authors

R.A. Narimov, Senior Researcher, Joint Stock Company "IGIRNIGM" of the State Committee for Geology of the Republic of Uzbekistan.
114, Shota Rustaveli st., Tashkent, 100059, Uzbekistan
Е-маil: romanrep@mail.ru

S.A. Umarov, Ph.D., Scientific Secretary, Joint Stock Company "IGIRNIGM" of the State Committee for Geology of the Republic of Uzbekistan
114, Shota Rustaveli st., Tashkent, 100059, Uzbekistan
Е-mail: shakhumarov@gmail.com

I.N. Khakimzyanov, Dr.Sc., Head of the Laboratory of the Oil Field Development Department, TatNIPIneft Institute - PJSC TATNEFT, Professor at the Department of Oil and Gas Field Exploration and Development Ufa State Petroleum Technological University, Branch of the University in the City of Oktyabrsky
40, Musa Jalil st., Bugulma, 423236, Russian Federation
E-mail: khakimzyanov@tatnipi.ru

A.U. Mirzaev, Doctor of Geological and Mineralogical Sciences, Professor, Chairman of the Navoi Branch of the Academy of Sciences of the Republic of Uzbekistan
Navoi, Uzbekistan
E-mail: mabdurazzok@mail.ru

S.S. Ahmedov, junior researcher, Joint Stock Company "IGIRNIGM" of the State Committee for Geology of the Republic of Uzbekistan
114, Shota Rustaveli st., Tashkent, 100059, Uzbekistan
E-mail: Saidakbar.87@mail.ru

T.F. Rakhmedov, Senior Research Associate,
Joint Stock Company "IGIRNIGM" of the State Committee for Geology of the Republic of Uzbekistan
114, Shota Rustaveli st., Tashkent, 100059, Uzbekistan
Е-mail: Tima280983@mail.ru

For citation:

For citation: R.A. Narimov, S.A. Umarov, I.N. Khakimzyanov, A.U. Mirzaev, S.S. Ahmedov, T.F. Rakhmedov Uluchsheniye vynosa kerna s primeneniyem novykh innovatsionnykh razrabotok [Core recovery improvement due to innovative solutions]. Neftyanaya Provintsiya, No. 1(33), 2023. pp. 81-94. 

DOI https://doi.org/10.25689/NP.2023.1.81-94. EDN ROLUKW (in Russian)