Inderscience Publishers

Restriction of gas losses in an overpressurised CO 2 reservoir using gel technology

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The overpressurised CO
2
field Bečej (Serbia) was explored in 1951. At the end of 1968, an uncontrolled gas blowout of Bč-5 well lasted 209 days resulting in 35 bars pressure drop in the reservoir until 2007. Hence, the substantial loss of reserve (> 17 billion m
3
) became a critical issue of the operator. Environmental friendly chemicals should be used only for well rehabilitation. Therefore, silicate-based method was recommended for the job. A triangle well pattern, inverted injection protocol and huge volume of treating solution were used to cure the problem. Placing the inorganic gel-forming chemicals into the target area, the annual decline of formation pressure was merely 0.03 bar/y compared to 0.9 bar/y prior to treatment. Thus, the uncontrolled gas flow was practically terminated, the loss of CO
2
reserve minimised, CO
2
emission to atmosphere was limited and the well against repeated gas blowout was also stabilised.

Keywords: CO 2 field, gas blowout, collapsed well, loss of reserve, vertical gas migration, restriction of vertical flow, stabilisation of reserve, prevention of environmental hazard

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