4,231
edits
Changes
Jump to navigation
Jump to search
Line 23:
Line 23: − +
Critical elements application: Niobrara example (view source)
Revision as of 21:25, 20 February 2014
, 21:25, 20 February 2014no edit summary
* Open calcite crystals lining the fractures
* Open calcite crystals lining the fractures
* Well must penetrate above critical elements in a more fracturable (more calcareous) bench within the Niobrara
* Well must penetrate above critical elements in a more fracturable (more calcareous) bench within the Niobrara
* Completion must be [[Well completions#Open hole completions|open hole]] (hang a slotted liner) with cement-block fractures
* Completion must be [[Well completions#Open hole completions|open hole]] (hang a [[Well completions#Liner completions|slotted liner]]) with cement-block fractures
* Drilling must be conducted with underbalanced mud or air to prevent fracture damage. The Niobrara is an underpressured reservoir with petrostatic (0.33 lb/ft gradient) rather than hydrostatic (0.43 lb/ft gradient) pressure.
* Drilling must be conducted with underbalanced mud or air to prevent fracture damage. The Niobrara is an underpressured reservoir with petrostatic (0.33 lb/ft gradient) rather than hydrostatic (0.43 lb/ft gradient) pressure.