| Title | Preproduction Simulation of Thermal Decline at La Primavera First 5-MW Wellhead Units |
|---|---|
| Authors | Kruger, P.; Aragon, A.; Maciel, R.; Lucio, C.; Villa, J. |
| Year | 1988 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Reservoir Engineering; Mexico; Jalisco; La Primavera; Simulation; Case Histories; Thermal Breakthrough |
| Abstract | Thermal breakthrough of separator brine and turbine condensate reinjected into non production wells at the La Primavera geothermal field in central Mexico has been estimated for the first two 5 MW portable generating units to be installed in 1989. The analyses are based on staff compiled reservoir and preproduction flow data used with the SGP-1D radial and doublet heat sweep models. The results are useful in selection of wells for recharge disposal of the waste fluids. The data were compiled under a single radial return flow geometry with mean reservoir characteristics for the two units. The simulations cover a range of reservoir and production parameter values that effect cool down rate of produced fluid from the three production wells to an abandonment temperature of 170°C, corresponding to the minimum inlet pressure to the CFE 5 MW generating unit turbines. The data show a range of thermal decline of 35 to 90 years over a range of return heat sweep angel from 25 to 65 degrees to the abandonment temperature for recharge of 68% of the produced fluid and a cool down rate of the reservoir fluid of -0.005 per year. The dependence on cool down rate and mean fracture spacing is small. . The doublet heat sweep model shows recharge fluid returning over a period of 450 years with thermal decline to 170°C in 300 years, compared to an estimated cool down in 150 year without reinjection recharge. |