What is Underbalanced Drilling?
Underbalanced drilling or "UBD" is an exploration and production drilling technology for drilling oil and natural gas wells wherein the pressure within the wellbore is intentionally maintained lower than the fluid pressure in the reservoir being drilled.
As the new oil/gas well is being drilled, formation fluids flow into the wellbore and up to the surface. This is the opposite of typical drilling operations where the wellbore is kept at a pressure ABOVE reservoir pressure to prevent a "kick" which occurs when formation fluids (hydrocarbons) enter the well. In a kick, the well is considered "overbalanced" and the invasion of these formation fluids into the wellbore (a kick) and if not shut-in, can lead to a well blowout.
What are Snubbing Services?
"Snubbing Services" with their "snubbing units" are deployed in the Upstream Oil and Gas industry on oil and natural gas wells when "heavy well intervention" is required. "Snubbing" an oil/gas well requires a snubbing unit whereby tubulars can be installed or removed from " live" oil & gas wells operating under reservoir/formation pressure thereby saving time, money and possible damage to the reservoir.
Snubbing services include the following typical applications:
Coiled tubing services
Deepen existing wells
Drilling new wells
"Live" well control
Removing bridge plugs
Running production tubing
Under-balanced drilling - UBD
Well completion services
Well control & well control services
Finally, another advantage that snubbing units provide include the ability to work on live wells without having to remove the Christmas tree from the wellhead.
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