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DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

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DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

Postby bforex » Mon Mar 23, 2015 7:25 pm

Greetings to all members,

DEFINITIONS AND GLOSSARY OF TERMS Alphabetically

Abandon a well v : to stop producing hydrocarbons when the well becomes unprofitable. A wildcat may be abandoned after poor results from a well test.

Mechanical and cement plugs are placed in the wellbore to prevent fluid migration to surface and between different zones.


Abnormal pressure n : a formation pressure which is greater or less than the "normal" formation fluid hydrostatic pressure. Such pressures may be classified as "subnormal"(lower than normal) or "overpressured" (higher than normal).


Accelerometer n : a surveying instrument which measures components of the Earth's gravitational field.


Acidise v : to apply acids to the walls of oil and gas wells to remove any material which may obstruct flow into the wellbore.


Adjustable choke n : a choke in which the rate of flow is controlled by adjusting a conical needle and seat.


Air drilling n : a method of drilling that uses compressed air as the circulating medium.


Angle unit n : the component of a survey instrument used to measure inclination.


Annular preventer n : a large BOP valve that forms a seal in the annular space between the wellbore and the drillpipe. It is usually installed above the ram type preventers in the BOP stack.
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Re: DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

Postby FANARCO » Mon Mar 23, 2015 7:26 pm

Thanx bforex,,

Very interesting thread. Keep going
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Re: DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

Postby bforex » Mon Mar 23, 2015 7:30 pm

Annulus n : the space between the drillstring and open hole or drillstring and cased hole in the wellbore.


Anticline n : a configuration of folded and stratified rock layers in the shape of an arch. Often associated with a trap.


A.P.I. abbr : American Petroleum Institute. The leading standardising organisation on oilfield drilling and production equipment.


A.P.I. gravity n : a measure of the density of liquid petroleum products, expressed in degrees.


Azimuth n : used in directional drilling as the direction of the trajectory of the wellbore measured in degrees (0-359) clockwise from True North or Magnetic North.
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Re: DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

Postby bforex » Tue Mar 24, 2015 8:33 pm

Back off v : to disconnect a section of stuck drillpipe by unscrewing one of the connections above the stuckpoint.


Back up :
1. v - to hold one section of pipe while another is being screwed into or out of it (as in back up tongs).
2. n - a piece of equipment held in reserve in case another piece fails.


Badger bit n : a specially designed bit with one large nozzle, which can be used as a deflecting tool in soft formations.


Bail n : a rounded steel bar which supports the swivel and connects it to the hook. May also apply to the steel bars which connect the elevators to the hook (links).


Ball up v : buildup of a mass of sticky material (drill cuttings) on components of drillstring (especially bits and stabilisers)


Barge n : a flat decked, shallow draft vessel which may accommodate a drilling rig, or be used to store equipment and materials or for living quarters.


Barite (Baryte) n : Barium Sulphate (BaSO4), a mineral used as a weighting material to increase mud weight (specific gravity = 4.2).


Barrel n : a measure of volume for fluids. One barrel (bbl) = 42 U.S. gallons = 0.15899 cubic metres. The term bbl is derived from the blue barrels in which oil was originally transported.


Bed n : a geological term to specify one particular layer of rock.


Bell nipple n : In marine drilling, the uppermost component of the marine riser attached to the telescopic joint. The top of the nipple is expanded to guide drilling tools into the well.
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Re: DEFINITIONS AND GLOSSARY OF TERMS (Drilling)

Postby bforex » Mon Mar 30, 2015 11:22 pm

Bentonite n : a finely powdered clay material (mainly montmorillonite) which swells when mixed with water. Commonly used as a mud additive, and sometimes referred
to as "gel".


Bent sub n : a short piece of pipe whose axis is deviated 1°-3° off vertical. Used in directional drilling as a deflecting tool.


Bit n : the cutting element at the bottom of the drillstring, used for boring through the rock.


Bit breaker n : a heavy metal plate which fits into the rotary table and holds the bit while it is being connected to or disconnected from the drillstring.


Bit record n : a report containing information relating to the operating parameters and performance of the bits run in a well.


Bit sub n : a short length of pipe installed immediately above the bit. The threads on the bit sub accept the pin thread on the bit and the pin thread for the drillcollars.


Bit walk n : the tendency for the bit and drillstring to wander off course by following the direction of rotation (usually to the right) in a directionally drilled well.


Blind rams n : one of the valves on the BOP stack. It is designed to close off the wellbore when the drillstring is out of the hole.


Blocks n : an assembly of pulleys on a common framework.
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