Core Holes At Fort Bliss Area (Combs, Et Al., 1999)
From Open Energy Information
Exploration Activity: Core Holes At Fort Bliss Area (Combs, Et Al., 1999)
|Exploration Activity Details|
|Location||Fort Bliss Area|
|Exploration Technique||Core Holes|
Drilling for the four holes followed the same general pattern: 1) set a conductor casing to a depth of 30-50', 2) drill - 6" hole through mostly sand/clay sedentary formations to 500-600', 3) set 4-1/2" surface casing at that depth 4) core HQ (3.89" dia.) mostly through limestone/dolornite or intrusive bedrock to TD. Core recovery in this hole was very good, more than 99% for the H-size core and more than 90% for the larger BSF (6-1/4" diameter hole, 4" diameter core) string. The lower percentage for the BSF string was primarily a fi,mctionof large voids encountered in the upper part of the hole, where the rock was more broken.
- Jim Combs, John T. Finger, Colin Goranson, Charles E. Hockox Jr., Ronald D. Jacobsen, Gene Polik (1999) Slimhole Handbook- Procedures And Recommendations For Slimhole Drilling And Testing In Geothermal Exploration