| Title | Analysis of Workover Techniques in Geothermal Wells of Cerro Prieto Field, Mexico |
|---|---|
| Authors | Juan De Dios Ocampo-DÌaz, Jaime E. Vaca Serrano |
| Year | 2005 |
| Conference | Stanford Geothermal Workshop |
| Keywords | |
| Abstract | The Cerro Prieto is one of the biggest geothermal fields on production stage in the world; to present day there are about 150 production wells located in 15 km2 area, producing a different mixture (water-steam) ratio. These wells supplying about 5,600 metric tons of steam per hour, to four power plants installed with 720 MWe of total capacity. There are several factors causing a steam production decline in wells, but in Cerro Prieto Field one of most common are the silica scaling in both reservoir and pipes. Therefore, each year is necessary to realize from 12-15 workovers. Additionally to workovering jobs in wells, others tasks like drill new wells, are making to recover and keep the steam flow rate required by power plants. Some workover techniques are usually manage to workover wells, these are cleaning the production casing, deepening the production zone, sidetrack, under reaming, etc, the workover selection type, depend of several factors like: pipes and reservoir conditions, workover risk, workover time and cost. This paper analyzes and discusses the workover techniques used in Cerro Prieto geothermal field from an economics and technical view points as well the results obtained from these workover. |