Experience in Geology Study and 3D Modeling of Achimovka Formations of the Urengoy Field based on 3D Seismic Survey Data (Russian)

Grechneva, O.M.; Malygina, O.; Ignatyev, A.; Zakrevskiy, K.

doi:10.2118/162004-ru

SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition 2012

DOI: 10.2118/162004-ru

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Experience in Geology Study and 3D Modeling of Achimovka Formations of the Urengoy Field based on 3D Seismic Survey Data (Russian)

O.M. Grechneva¹,

O. Malygina²,

A. Ignatyev³

et al.

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2014

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Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Graf

2014

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The production focus has shifted from the easy-to-access, shallow, gas-bearing deposits in the Cenomanian and Valanginian of the Urengoyskoye Field to the deeper, tight, gas-condensate formations in the Achimov. Several different operators have started to develop the Achimov formation with different development strategies on over eleven license blocks; however, with the common objective to maximize liquid and gas production from their license. Based on a couple of pilot projects with extensive testing, a unified development plan over the entire Achimov formation had been devised before the development start-up to guarantee hydro-carbon recovery and guide the operators through the development. Due to the enormous challenges encountered in the Achimov formation such as high pressure, low formation quality and deviated well stability challenges, the initial unified development plan foresaw the drilling of simple production pattern with a large amount of vertical wells. However, since the instigation of the unified strategy, the technology has advanced to overcome most of the challenges encountered in the Achimov formation with the potential of improving the sub-optimal, original development plan. This paper discusses the general challenges of the Achimov development from well construction, production operations to reservoir management encountered by the various operators and attempts to define integrated solutions chains to overcome those. The operational and financial impact of the various technologies of the solution chains is defined and a possible roadmap for field development is devised. Several different operators have started to develop the Achimov formation with different development strategies on over eleven license blocks.

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Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Graf

2014

All Days

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Channel Fracturing Improves Stimulation Efficiency by 30% in the Achimov Gas Condensate Formation

et al. 2014

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In the Urengoyskoe field, Russia, the Achimov deposits are found at depths of nearly 4000 m and feature a more complex geological structure when compared to the Cenomanian and the Valanginian deposits. Furthermore, the Achimov deposits feature abnormally high formation pressure (over 600 bar) and are characterized by a multiphase state of hydrocarbons. To achieve economic well production, performing stimulation treatments in the Achimov formation of Urengoyskoe gas condensate field is required.Hydraulic fracturing proved to be a reliable method for increasing well productivity from the Achimov formation by a factor of 2.5; however, well completion restrictions allow for placing only small-size proppant mesh. Proppant fracturing treatments are conducted with high-polymer loading to ensure fluid stability at high formation temperatures, which leads to further reduction of fracture cleanup efficiency. These effects reduce the effective half-length and compromise the full production potential.New channel fracturing technology that creates open-flow channels inside the proppant pack was selected to improve production. Channels are created by pulsating proppant at surface. Pulses with proppant are separated by pulses of clean fluid, which creates proppant clusters inside the fracture, holding the walls of the fracture open. Fracture cleanup is conducted through channels without restrictions to fluid and polymer flowback. Thus, the channels improve effective fracture half-length and, consequently, gas condensate rates. The increased drainage area also improves hydrocarbon recovery.Previously in Russia, channel fracturing was used primarily in oil fields. The largest gas operator in Russia has initiated an extensive pilot campaign for channel fracturing in new areas of the Urengoyskoe field. To date, seven wells have been successfully completed with channel fracturing, leading to a significantly higher productivity of 30% versus offset conventionally stimulated wells and lower drawdown.

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Experience in Geology Study and 3D Modeling of Achimovka Formations of the Urengoy Field based on 3D Seismic Survey Data (Russian)

Cited by 2 publications

References 0 publications

Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Vertical and Horizontal Integration to Overcome Extreme Operational Challenges for the Achimov Tight, Gas-Condensate Formation

Channel Fracturing Improves Stimulation Efficiency by 30% in the Achimov Gas Condensate Formation

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