Due to the success and experience obtained in the Samaria Neogene field pilot test, it was decided to exploit the field by cycling steam stimulation.
The development of the field has been carried out in three phases. The first phase, 48 wells were drilled with 400 meters spacing. The positive results of the first phase encouragement the development of the second and third phases, they consisted in 43 and 33 infill wells, with 200 and 150 meters spacing respectively.
In the first cycles, the injection pressure was very high, even in the wells that were produced for 6 months with Sucker Rod Pump (up to 2,400 psi in the deepest wells). In the second cycles there were no high injection pressures since the well surroundings were depressurized by the first cycle. In the second cycles the injection pressure drop between 50 to 400 psi, achieving a very good steam admission by the wells in the second and third cycles.
As a result of the decrease in the well spacing, the wells close to the injection wells began to show a heat increase in the produced fluids, for example, in two wells with less than 50 meters of spacing between them, during the injection of one, the other rase the temperature from 60°C to 110°C. This behavior has been very benefical for the project because reduces the viscosity not only in the injection well if not also in some of the nearby wells, resulting in an increased production in both wells. In most cases, when one of the neighboring wells is producing from the same sands, also there is steam channeling. If this channeling will be controlled, it would exist the possibility of moving to a continuous steam injection.
This paper will present how the steam injection has been successful despite different conditions taken in the pilot test.