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2. Drill bit (well) - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_(well)

   Drill bit (well) In the oil and gas industry, a drill bit is a tool designed to produce a generally cylindrical hole (wellbore) in the Earth’s crust by the rotary drilling method for the discovery and extraction of hydrocarbons such as crude oil and natural gas. This type of tool is alternately referred to as a rock bit, or simply a bit.

3. Lost circulation - Wikipedia

   en.wikipedia.org/wiki/Lost_circulation

   Depth of the well in regards to geological stability. Depth of well in relation to the desired production zones. Plugging a production zone is not a desired outcome. Drill bit nozzle sizes. If the additive(s) will not go through the drill bit, they cannot be used. Other drill string mechanical equipment such as a mud motor or MWD tools. If the ...

4. Glossary of oilfield jargon - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_oilfield_jargon

   Spud date: When drilling a new well, the spud date is the day on which the main drill bit begins drilling. For onshore drilling, spudding-in occurs after a wellsite has been prepared and a larger surface hole drilled and cased in preparation for the main drill bit to be used. Subsalt: Refers to oil prospects that lie below a salt layer. [7]

5. List of components of oil drilling rigs - Wikipedia

   en.wikipedia.org/wiki/List_of_components_of_oil...

   Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. It contains jets through which the drilling fluid exits. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area ...

6. Drilling fluid - Wikipedia

   en.wikipedia.org/wiki/Drilling_fluid

   In geotechnical engineering, drilling fluid, also known as drilling mud, is used to aid the drilling of boreholes into the earth. Used while drilling oil and natural gas wells and on exploration drilling rigs, drilling fluids are also used for much simpler boreholes, such as water wells. The two main categories of drilling fluids are water ...

7. Bottom hole assembly - Wikipedia

   en.wikipedia.org/wiki/Bottom_hole_assembly

   Bottom hole assembly. A bottom hole assembly (BHA) is a component of a drilling rig. It is the lowest part of the drill string, extending from the bit to the drill pipe. The assembly can consist of drill collars, subs such as stabilisers, reamers, shocks, hole-openers, and the bit sub and bit. [1]

8. Driller's depth - Wikipedia

   en.wikipedia.org/wiki/Driller's_depth

   Driller's depth is always recorded, and it constitutes the primary depth system, unless it is later superseded by a more accurate measurement such as the depth from an open- or cased-hole wireline log. Driller's depth should always have 1) a unit of measurement e.g. meter or feet, 2) a datum reference e.g. rig floor.

9. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   AGT – (1) agitator, used in drilling. AGT – (2) authorised gas tester (certified by OPITTO) AGT – (3) Azerbaijan – Georgia – Turkey (a region rich in oil related activity) [3] AHBDF – along hole (depth) below Derrick floor. AHD – along hole depth. AHU – air handling unit. AICD – autonomous inflow control device.