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underbalanced drilling

Title English: 
underbalanced drilling
Acronym English: 
UBD
Definition English: 
Underbalanced drilling, or UBD, is a procedure used to drill oil and gas wells where the pressure in the wellbore is kept lower than the fluid pressure in the formation being drilled. As the well is being drilled, formation fluid flows into the wellbore and up to the surface.
Title Arabic: 
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المجال الأحصائي: 
Sustainable Development
الموضوع: 
Water Resources
InformationType: 
Term
SourceSymbol: 
E/ESCWA/SDPD/2007/8