Objective
Design. Build and put into operation a field pilot for a EOR process by non-miscible CO2-rich gas injection into the very heavy (10 to 15 degrees API) oil field of Ponte Dirillo, Italy.
The Ponte Dirillo deposit produces a heavy oil from two heavily -fractured carbonated reservoirs. Laboratory studies and well -logging of certain reservoir areas have made it possible to determine a recovery method involving injection of a non-miscible CO2 enriched gas at the top of the deposit in order to replace the natural thrust of the bottom water. In addition, gas injection at the water-oil contact level can reduce well problems caused by the water level rising. The fluid injected was a mixture of CO2 enriched gas produced by the Gela field and natural gas from the regional grid.
To carry out the project it was necessary to build gas-injection equipment for the wells selected, facilities to separate the oil produced and equipment linking up with the Gela field's production centre.
Several types of tests were carried out :
- Injection of a large volume of high pressure gas in a peripheral well at the oil water contact level. The results were good, with an increase in daily production from 120 cubic metres in March 1984 to 180 cubic meters in June 1984. This type of injection has proved to be an effective way of combating a rise in the water level.
- Gas injection in a central well with cycles consisting of injection followed, after a rest period, by bringing into production ("huff-n-puff" method). The results were disappointing because of problems resulting from the vertical migration of the gas and too short a residence time in the vicinity of the well.
- Gas injection at the top of the deposit ensured a better rate of recovery of the oil in place without increasing water production ( 260 cubic metres a day in December 1985).
Significant results in terms of the production at the Ponte Dirillo field were achieved.
The project is based on the results of a previous study, carried out on the heavy oil field of Gela (contract 00016-75) of similar characteristics. A campaign of well surveys, laboratory tests and a numerical model simulation were carried out. The pilot plant was designed, built and put into operation.
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Programme(s)
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Coordinator
20097 S. Donato Milanese (MILANO)
Italy
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.