Related Oil & Gas Terms

• Poppet valve

  A device that controls the rate of flow of fluid in a line or opens or shuts off the flow of fluid completely. when open, the sealing surface of the valve is moved away from a seat; when closed, the sealing surface contacts the seat to shut off flow. the direction of movement of the...

• Drill stem test (dst)

  The conventional method of formation testing. the basic drill stem test tool consists of a packer or packers, valve or ports that may be opened and closed from the surface, and two or more pressure-recording devices. the tool is lowered on the drill string to the zone to be tested. the packer or packers are...

• Bullheading

  1. forcing gas back into a formation by pumping into the annulus from the surface. 2. any pumping procedure in which fluid is pumped into the well against pressure. 3. to forcibly pump fluids into a formation, usually formation fluids that have entered the wellbore during a well control event. though bullheading is intrinsically risky, it is...

• Christmas tree

  1. the set of valves, spools and fittings connected to the top of a well to direct and control the flow of formation fluids from the well. 2. the control valves, pressure gauges, and chokes assembled at the top of a well to control the flow of oil and gas after the well has been drilled and...

• Blowout

  1. an uncontrolled flow of gas, oil, or other well fluids into the atmosphere or into an underground formation. a blowout, or gusher, can occur when formation pressure exceeds the pressure applied to it by the column of drilling fluid. 2. an uncontrolled flow of reservoir fluids into the wellbore, and sometimes catastrophically to the surface....