Channel Fracturing Improves Stimulation Efficiency by 30% in the Achimov Gas Condensate Formation (Russian)
- A. Yudin (Schlumberger) | I. Tarakanov (Schlumberger) | A. Klyubin (Schlumberger) | A. Ablaev (Schlumberger) | M. Zharikov (Gazprom Dobycha Urengoy) | A. Vashkevich (Gazprom Dobycha Urengoy) | I. Yaskin (Gazprom Dobycha Urengoy) | L. Sabirov (Gazprom Dobycha Urengoy)
- Document ID
- Society of Petroleum Engineers
- SPE Russian Oil and Gas Exploration & Production Technical Conference and Exhibition, 14-16 October, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2014. Society of Petroleum Engineers
- 3 in the last 30 days
- 269 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 9.50|
|SPE Non-Member Price:||USD 28.00|
The pdf file of this paper is in Russian.
This paper was prepared for presentation at the Young Professional Session of the SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition held in Moscow, Russia, 14–16 October 2014.
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 economical 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 lead to further reduction of fracture cleanup efficiency. As a result, these effects reduce the effective half-length and comprise 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 fracture, holding walls of the fracture open. Fracture cleanup is conducted through channels without restrictions to fluid and polymers flowback. Thus, the channels improve effective fracture half-length and gas condensate rates, respectively. Hydrocarbon recovery is also improved due to the increased drainage area.
Previously, in Russia channel fracturing was used primarily in oil field. The largest gas operator in Russia has initiated an extensive pilot campaign in new areas of the Urengoyskoe field that will be described in detail in this paper. To date, 7 wells were successfully completed with channel fracturing leading to a significantly higher productivity of 30% versus offset conventionally stimulated wells and lower drawdown.
|File Size||1 MB||Number of Pages||11|