Crucial in well life cycle management is an analysis of technology and economy balance from the beginning (well project) to the end (well abandonment and environment sanitary improvement).

On the basis of over one thousand drilled oil, gas and geothermal wells (since 1950.), on-shore and off shore, over fifty thousand completions and workovers and about five hundred abandoned wells, an overall analysis will be done to state problems and solutions considering the technology to economy balance.

In the paper we will try to point out phases in well life cycle that are of the greatest influence on economy.

Finally, the optimal way of well or entire field abandonment and produced waste management will be discussed from technological and economical standpoint.

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