JSC Arcticgas (a subsidiary of Gazprom Neft and NOVATEK) has completed the first ever four-stage fracking of a horizontal well in the Yamalo-Nenets Autonomous Region, undertaken as part of the development of Achimov deposits in the Urengoyskoye field. Results from work completed thus far indicate production has exceeded two million cubic metres of gas and 770 tonnes of gas condensate per day — considerably in excess of predictions made on the basis of hydraulic fracturing of directional wells.
Complex three- and four-stage fracking has been undertaken at five wells at the Urengoyskoye oil and gas field over the past six months. Work undertaken at the Achimov deposits is based on the hydro-dynamic (“fluid-flow”) model, optimising cracking distribution and involving the pumping of high volumes of proppant agents at every stage in the horizontal part of the well.
The transition to multi-stage fracking at Arcticgas assets will lead to an increase in production volumes of gas and condensate, increasing the viability of developing these fields.
Arcticgas General Director Vladimir Kudrin commented: “The complexity of undertaking work like this is mainly due to the abnormally high initial reservoir pressure, the high reservoir temperature, the high concentration of condensate within the gas, and the low permeability of the formation. All of which requires the application of non-standard solutions and complex technical equipment. The experience gained, however, will allow us to increase the viability of operations throughout the company’s fields.”
JSC Arcticgas, a joint enterprise between Gazprom Neft and NOVATEK, holds exploration and production (E&P) licenses for the Samburgskoye license area, as well as licenses for geological prospecting and hydrocarbon production within the Yevo-Yakhinskoye, Yaro-Yakhinskoye and Severo-Tchaselskoye areas. The company’s proven reserves (PRMS standards) as at 31 December 2014 amount to 695 billion cubic metres of natural gas and 127 million tonnes of liquid hydrocarbons.
The first phase of the Samburgskoye field (part of the Samburgskoye license area) was brought into production in April 2012 and the second in December 2012, with the third commissioned in September 2014. Total capacity at the field is estimated at seven billion cubic metres of gas and 900,000 tonnes of gas condensate per year.
The first phase of the Urengoyskoye field (part of the Samburgskoye license area) was brought into production in April 2014 and the second in December, with the field going into full commercial production in March 2015. Total capacity at the field is estimated at 13 billion cubic metres of natural gas and 4.7 million tonnes of de-ethanized gas condensate per year.
The Yaro-Yakhinskoye field was brought into production in early April 2015. Production at this field is shortly expected to reach projected levels of around 7.7 billion cubic metres of natural gas and 1.3 million tonnes of de-ethanized gas condensate per year.
The Achimov oil and gas formation is one of the most complex development prospects in Western Siberia. The Achimov deposits lie at a depth of around 4,000 metres, and have a far more complex structure in comparison with the Senomansky (which lie at a depth of
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