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...+flow plastic flow]). Abnormally high pore pressures can cause [[Wikipedia:Blowout (well drilling)|blowouts]] when present in highly [[permeability|permeable] ...tion results in increased mud expense and may cause subsurface [[Wikipedia:Blowout (well drilling)|blowouts]]. The proper drilling fluids and use of lost circ

* annular blowout preventer http://www.glossary.oilfield.slb.com/en/Terms/a/annular_blowout_p * blowout Wikipedia:Blowout (well drilling)

...he [http://www.glossary.oilfield.slb.com/en/Terms/b/blowout_preventer.aspx blowout preventers] (38). The top of the substructure is called the ''[http://www.g ...e control system on a rig, and they are the last line of defence against a blowout. The BOPs are bolted to the wellhead and are not removed until the well is

...he [http://www.glossary.oilfield.slb.com/en/Terms/b/blowout_preventer.aspx blowout preventers] (BOPs) are mounted above sea level. On [[Offshore rigs#Floaters

...d in the combustion and explosive blast that can result from a hydrocarbon blowout.

...gas, oil, or water out of the hole. The most common method is to close the blowout preventers and stop the pumps. After a few minutes, the pressure at the top ...11,100 ft. Shortly thereafter, the well showed indications of an impending blowout.<ref name=Wallace_1965>Wallace, W. E., 1965, Abnormal subsurface pressures

...s influx will give rig crews time to respond to toxic gases or a potential blowout condition. Accurate gas data recorded during drilling is of great value in

* Drilling a relief well to kill a blowout

| Blowout || Circular rim of depression || 1 or more || Multidirectional || Variable

...gas represents an underbalanced formation and, if left alone, will cause a blowout.

...entially uncontrolled during the test. All fire fighting equipment and the blowout preventers should be inspected and tested before starting a DST. Hydrogen s