JSC NPC Nedra (a part of the ROSGEO State Holding Company, Yaroslavl) completed construction of Nizhne-Chona Stratigraphic Well 252 in the north-west of Nepa-Botuoba Oil and Gas Region.
The Company started the project in early 2014, when it won the respective tender held by Rosnedra and was awarded with the government contract. Pursuant to the contract by the end of 2016 the enterprise had to drill the well to assess petroleum potential of the western extension of the Talakan-Botuoba carbonate platform (Osinian horizon of Cambrian and of terrigenous Vendian), to outline a zone of oil and gas accumulations and to delineate the blocks of potential hydrocarbons occurrence worthy of further exploration in Vendian oil and gas complex within the western monoclinal slope of the Nepa-Botuoba anticlise.
The well was drilled to 2270 m at well design depth of 2200 m. In 2016 three sites were tested in the production casing, the well was abandoned, and the final geological report was issued and submitted to geological funds.
As a result, a three-phase flow (gas of hydrocarbon composition, oil of 0.87 g/cm3 specific gravity, and water of 1.27 g/cm3 specific gravity) was produced from the Osinian horizon. The horizon was recognized potentially producing.
The project also provided geophysical and velocity characteristic of the well column, plus the geological/geophysical model of the west slope of Nepa-Botuoba aneclise was updated.
Laboratory testing of 5,472 core, cuttings and fluids samples provided the basis for lithological/stratigraphic, geochemical and petrophysical parameters of the well column. The recommendations for further geological exploration were elaborated based on the survey data and presented to Customer.
RG-Inform, Press Service of ROSGEO JSC
ROSGEO is a Russian multi-industry geological holding company, which offers a full range of geological exploration services from regional surveys to stratigraphic drilling and subsoil monitoring. The holding company boasts unique expertise, particularly in marine geology and shelf operations.
ROSGEO was established by Decree No. 957 of the President of the Russian Federation dated 15 July 2011 on the basis of Tsentrgeologia, one of the oldest exploration companies in Russia. ROSGEO is a fully state-owned company.
The enterprises within the holding company operate in all eight federal districts of Russia. ROSGEO includes 53 enterprises located across the country. A total of more than 1,000 fields and deposits have been discovered by the holding’s companies, including major hydrocarbon and solid mineral deposits and fields such as the Astrakhan field (2.5 trillion cubic meters of natural gas), the Tengiz field (3.1 billion tonnes of oil), the Kovykta field (1.9 trillion cubic meters of natural gas), the Sukhoi Log deposit (about 2,000 tonnes of gold), the Kursk Magnetic Anomaly, and many others.
ROSGEO’s subsidiaries have rich experience in implementing projects abroad: dozens of new fields and deposits have been discovered in Asia, Europe, Africa, and Latin America.
ROSGEO clients include such companies as Gazprom, Rosneft, Lukoil, Severstal, MMC Norilsk Nickel, Itera, NLMK, Sibuglemet, BP, Chevron, and many others.
NPC Nedra is engaged in design, construction and integrated study of any types of wells; in development of research and engineering products of well construction technologies and integrated study of subsoil. For over 45 years the company has been drilled and studied deep and superdeep wells in sedimentary and crystalline rocks. Company has drilled over 100 km of superdeep wells in Russia, Kazakhstan and Ukraine including Kolskaya (12,262 m) that was considered the world’s deepest well for a long time, and En-Yakhinskaya (8,250 m) - the deepest ever drilled in the sedimentary basins of Russia.