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Critical elements application: Niobrara example (view source)
Revision as of 18:49, 13 March 2014
, 18:49, 13 March 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 [[Well completions#Liner completions|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 fracture]]s
* Drilling must be conducted with [[Analysis of mud weights|underbalanced mud]] or air to prevent fracture damage. The Niobrara is an [[Causes of underpressure|underpressured reservoir]] with [[Geostatic and lithostatic pressure|petrostatic]] (0.33 lb/ft gradient) rather than [[Normal hydrostatic pressure|hydrostatic]] (0.43 lb/ft gradient) pressure.
* Drilling must be conducted with [[Analysis of mud weights|underbalanced mud]] or air to prevent fracture damage. The Niobrara is an [[Causes of underpressure|underpressured reservoir]] with [[Geostatic and lithostatic pressure|petrostatic]] (0.33 lb/ft gradient) rather than [[Normal hydrostatic pressure|hydrostatic]] (0.43 lb/ft gradient) pressure.