ELF Petroland gas wells were acidized traditionally with HC1-HF (Mud-acid)

The standard acidification procedures have been modified as follows:

  1. HF has been removed from the treatments and HCl alone is used, and in reduced quantities.

  2. The acid is followed with an overflush designed to push the acid into the sandstone far enough so all the acid can spend on the carbonates of formation. The results show a dramatic decrease of clean up time needed, and thus of the gas quantity flared.

Those simple modifications in procedures led to substantial savings, good production performance, and ecological improvements.

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