Oil and Gas News | Oil and Gas Jobs | Oil and Gas Engineering
The Oil & Gas Hub
Special Designed Oilfield Tally Book – Try Now
  • Main
  • News
  • Photo
  • Video
  • Oilfield Jobs
  • Learning Section
  • Oil & Gas Calculator

Underbalanced drilling vs Conventional drilling

2020.01.16
2 711

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.



In conventional, or “Overbalanced”, drilling fluid is pumped into the well shaft at pressure higher than in the reservoir. This keeps the oil and gas in the reservoir during drilling, but the high pressure can damage the rock around the wellbore.

Related Posts

Oil & Gas Well Cementing Engineer Calculator
2025.10.11
164
Oil & Gas Well Cementing Engineer Calculator
Comprehensive cementing design and analysis tool for oil & gas wells
IPR/Nodal Analysis calculator with interactive pressure-flow charts for production optimization
2025.10.05
225
IPR/Nodal Analysis calculator with interactive pressure-flow charts for production optimization
ECD (Equivalent Circulating Density) calculator
2025.10.04
201
ECD (Equivalent Circulating Density) calculator
Annular Volume Calculator
2025.10.02
11 086
Annular Volume Calculator
Annular volume calculator for oil and gas wells calculates the volume of the annulus between the dri…
Market quotes are powered by TradingView.com
© Oil and Gas News | Oil and Gas Jobs | Oil and Gas Engineering, 2025
ADVERTISE  | Contact Us  | Privacy Policy  
Made in studio Zuber