In Hungary, the laboratory and pilot-tests on the application of CO2 containing gases for production purposes was started in the 1960's. In the early stage of experiments CO2 produced from flue gases was used and later, the production experiments were based on the natural gas of high CO2 content (81% v/v) explored under the Budafa oil producing field. The formation pressure at the Budafa deep-reservoir is so high that no compression is needed.

On the basis of promising experimental results, field-scale CO2 IOR operations have been started in Budafa-Field and in Lovászi--Field which are sandstone reservoir rocks, and in both, partially soluble methods have been applied. In these fields WAG (water- and -gas alternative injection) methods have been carried out.

At the present time, only the water injection is going on. In 1988, in one part of Nagylengyel-Field, a large scale artificial CO2 -gas cap cooperation was started. The Nagylengyel-Field is a carstic--cavern type reservoir with active bottom--water pressure, where during primary production gas recovery did not occure.

The production results are better than the expected.

This paper summarizes the main data of fields, the operational characteristics, and operational experience has been gained regarding the production, dehydration and transportation of CO2, and the surface facilities.

It is intended to expand the CO2 IOR method also for other parts of Nagylengyel-Field, and now the application of sweetened CO2 gas is under preparation, and an other CO2 project (for Szank-Field) is also planned.

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