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- Underbalanced_drilling abstract "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. This is the opposite of the usual situation, where the wellbore is kept at a pressure above the formation to prevent formation fluid entering the well. In such a conventional \"overbalanced\" well, the invasion of fluid is considered a kick, and if the well is not shut-in it can lead to a blowout, a dangerous situation. In underbalanced drilling, however, there is a \"rotating head\" at the surface - essentially a seal that diverts produced fluids to a separator while allowing the drill string to continue rotating.If the formation pressure is relatively high, using a lower density mud will reduce the well bore pressure below the pore pressure of the formation. Sometimes an inert gas is injected into the drilling mud to reduce its equivalent density and hence its hydrostatic pressure throughout the well depth. This gas is commonly nitrogen, as it is non-combustible and readily available, but air, reduced oxygen air, processed flue gas and natural gas have all been used in this fashion.Coiled tubing drilling (CTD) allows for continuous drilling and pumping and therefore underbalanced drilling can be utilized which can increase the rate of penetration (ROP).".
- Underbalanced_drilling wikiPageExternalLink www.spe.org.
- Underbalanced_drilling wikiPageID "8172483".
- Underbalanced_drilling wikiPageLength "6126".
- Underbalanced_drilling wikiPageOutDegree "16".
- Underbalanced_drilling wikiPageRevisionID "679320049".
- Underbalanced_drilling wikiPageWikiLink Blowout_(well_drilling).
- Underbalanced_drilling wikiPageWikiLink Category:Drilling_technology.
- Underbalanced_drilling wikiPageWikiLink Coiled_tubing_drilling.
- Underbalanced_drilling wikiPageWikiLink Differential_sticking.
- Underbalanced_drilling wikiPageWikiLink Directional_drilling.
- Underbalanced_drilling wikiPageWikiLink Drill_string.
- Underbalanced_drilling wikiPageWikiLink Drilling_fluid.
- Underbalanced_drilling wikiPageWikiLink Drilling_fluid_invasion.
- Underbalanced_drilling wikiPageWikiLink Flue_gas.
- Underbalanced_drilling wikiPageWikiLink Formation_damage.
- Underbalanced_drilling wikiPageWikiLink Hydrostatics.
- Underbalanced_drilling wikiPageWikiLink Lost_circulation.
- Underbalanced_drilling wikiPageWikiLink Mud_cake_(oil_and_gas).
- Underbalanced_drilling wikiPageWikiLink Natural_gas.
- Underbalanced_drilling wikiPageWikiLink Rotating_head.
- Underbalanced_drilling wikiPageWikiLinkText "Underbalanced drilling".
- Underbalanced_drilling wikiPageWikiLinkText "underbalanced drilling".
- Underbalanced_drilling wikiPageWikiLinkText "underbalanced".
- Underbalanced_drilling wikiPageUsesTemplate Template:Original_research.
- Underbalanced_drilling wikiPageUsesTemplate Template:Petroleum_industry.
- Underbalanced_drilling wikiPageUsesTemplate Template:Unreferenced.
- Underbalanced_drilling subject Category:Drilling_technology.
- Underbalanced_drilling hypernym Procedure.
- Underbalanced_drilling type AnatomicalStructure.
- Underbalanced_drilling comment "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. This is the opposite of the usual situation, where the wellbore is kept at a pressure above the formation to prevent formation fluid entering the well.".
- Underbalanced_drilling label "Underbalanced drilling".
- Underbalanced_drilling sameAs Q7883440.
- Underbalanced_drilling sameAs حفاری_زیر_فشار_تعادلی.
- Underbalanced_drilling sameAs m.026v5g6.
- Underbalanced_drilling sameAs Q7883440.
- Underbalanced_drilling wasDerivedFrom Underbalanced_drilling?oldid=679320049.
- Underbalanced_drilling isPrimaryTopicOf Underbalanced_drilling.