This article is based on five years experience in acid fracturing on a Middle East offshore field operated by TOTAL-CFP.

The field in question is a highly stratified formation containing dolomitic reservoirs which are separated by very compact and almost impermeable anhydritic interbeds. [FIG. 1]

The producing layers (A, B, C, D and E) vary in thickness and two of these are of particular interest: «A», which has already been considerably depleted with a fairly high matrix permeability (150 to 200 mD) and «E» only slightly depleted, and with a much lower matrix permeability (25 to 30 mD).

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