Objective
TO STIMULATE LOW PRODUCTIVITY WELLS IN THE LATERA GEOTHERMAL FIELD.
Stimulation operations have been carried out on 4 wells in 2 geothermal areas. The increased costs in deep well exploitation has necessitated the development of methodologies aimed at increasing well productivity or drilling success.
8 stimulation jobs have been performed on the wells of Latera geothermal field and 4 of them were successful. The stimulation operations were planned for the 2 low production wells L10 and L4. In the case of well L10, which produces from a siliceous rock formation, a series of acid attack laboratory tests were performed to select the most suitable acid composition. Unfortunately stimulation was not possible in this well due to casing collapse during workover operations. Stimulation in well L4, with the injection of the hydrogen chloride solution at 2 different depths, was fairly successful. In this case skin effect was not positive and stimulation led to an increase of about 30% in the flow rate estimated at a well head pressure of 10 bar with consequent increase in the electric generating capacity from 3.5 to 4.5 MWe.
DESCRIPTION:
THE LATERA FIELD TAPS A WATER-DOMINATED GEOTHERMAL RESERVOIR WITH TEMPERATURES IN THE RANGE 190-230'C. THE RESERVOIR IS IN A FRACTURE CARBONATE FORMATION AND A NUMBER OF THE EXISTING WELLS ARE DRY OR OF LOW PRODUCTIVITY. THE AIM IS TO STIMULATE FRACTURES IN LOW PRODUCTIVITY WELLS BY ACIDIZING IN ORDER TO IMPROVE PRODUCTIVITY OR INJECTIVITY.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry inorganic compounds
- social sciences economics and business economics production economics productivity
- engineering and technology environmental engineering energy and fuels renewable energy geothermal energy
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Coordinator
56100 Pisa
Italy
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