Urengoy Oil and Gas Condensate Field as other fields of North of West Siberia is in final stage of development in present time which characterized by depletion of reservoirs and decreasing of reservoir pressure.

Today operating well stock in Urengoy Oil and Gas Condensate Field consists of 174 wells of which 135 wells are in operations and 39 are in off-period. The most reasons of being off period are follows:

  • low inflow;

  • technical condition;

  • water influx after drilling;

  • water influx after exploitation;

  • wells in completion after hydraulic fracturing.

Hydraulic fracturing is commonly applies in both operating and off-period wells in Urengoy Oil and Gas Condensate Field for stabilization of hydrocarbons production. Hydraulic fracturing is performed on gas, gas condensate and oil wells of Urengoy Oil and Gas Condensate Field. After hydraulic fracturing one of main problems still remains which is bottom-hole cleaning of proppant plug.

According to design projects of Urengoy Oil and Gas Condensate Field hydraulic fracturing is performed with underflush of proppant in well, in other words proppant is left at perforation intervals and above it.

Preparatory works and post-frac operations in Urengoy Oil and Gas Condensate Field are carried out by different service companies with applying of different technologies of bottom-hole cleaning of proppant. One of such organizations is Urengoy Well Servicing Management of "Gazprom Podzemremont Urengoy" LLC.

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