| Title | Results of Geological - Geophysics Drilling of the Well H-43 the Geothermal Field in Humeros, Pue. Mexico |
|---|---|
| Authors | Santiago Rocha López, Germán Ramírez Silva, Esteban Jiménez Salgado, Lorenzo Pulido Cecilia |
| Year | 2010 |
| Conference | World Geothermal Congress |
| Keywords | The Humeros Field, H-43, H-35, H-16, Humeros, Antigua, La Cuesta., FMI, Fracture analysis, seismic interpretation, resistivity |
| Abstract | The Department of Exploration and Residencia of Los Humeros, of the Management Geotermoléctricos conducted a campaign of structural-geological studies, analysis of data from existing wells, and geophysical studies and measurements to determine the best location to drill a new production well (H-43). The objective of the well is to intercept the structural zone of N-S trending fracture, located in Malpaís, Antigua and La Cuesta, which dips to the east, with a depth of interest of 1300-2200 m. In a recent multidisciplinary meeting regarding the drilling of the well, it was decided to quit in hole discovery from 1250-2200 m, at the risk of being located in an area acid. The Mexican company LATINA conducted the drilling operation, and the CFE and Schlumberger conducted data acquisition. The well H-43 was spudded on October 22th 2007 with the drill rig IDECO #2 and was drilled down to a depth of 2200 m. Well operations were concluded on January 7th 2008. Drilling reached the depth of 2200 m in 89 days. The maximum temperatures recorded in well logs was 350°C. Stabilized temperatures were calculated for 1250 m at 228°C and 383°C at 2200 m. The fluids in the region are supercritical, and are a possible indicator of corrosion phenomena. The Department of Exploration, not look that the well will reached as high temperature. In the bottom of H-43, hydrothermal and metasomatic processes are affecting the limestone and volcanic sequence. The objective structural geologic and geophysical resistivity was met satisfactorily. One tool was the benefit of passive seismic monitoring and implementation of focal mechanisms. The well was evaluated to 5 days of its opening with a Qv= 60 t/h; Qa= 0.4 t/h; Pc=50bars The structural system N-S: La Antigua Fault System is responsible for the production of the wells H-37D, H-35 and in the near future of the H-43. The Antigua fault is responsible for the net slip of 280 m: the appearance of the top of the limestone between wells H-43 (1740), and H-16 (2020m), whose expression and morphological today is not apparent on the surface. Well H-43, was left uncovered in the hole from the 1250-2200m. A petrographic analysis identified the well as being acidic, mostly observed in the rock formation. The preferential strike direction (FMI) for fracture and fault zones lies between N-S and NNE-SSW. These fault zones are consistent with field observations and the Antigua fault strike direction. |