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| storage device for nitrogen pressurized hydraulic fluid, which is used in operating the blowout preventers. |
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| A device used during surveying to measure the acceleration of a ship or aircraft, or to detect ground acceleration in boreholes or on the Earth's surface produced by acoustic vibrations. |
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| A drilling technique whereby gases (typically compressed air or nitrogen) are used to cool the drill bit and lift cuttings out of the wellbore, instead of the more conventional use of liquids. |
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| - Adjustable kickoff manipulates the angles of the motors |
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| the space around a pipe in a well bore, sometimes termed the annular space. |
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| ss of energy or amplitude of waves as they pass through media. |
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| angle between the vertical projection of a line of interest onto a horizontal surface and true north or magnetic north measured in a horizontal plane, typically measured clockwise from north. |
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| to unscrew one threaded piece (such as a section of pipe) from another. |
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| a measure of volume for petroleum products in the United States. One barrel is the equivalent of 42 U.S. gallons or 0.15899 cubic meters (9,702 cubic inches). |
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| A n enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well. |
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| a short cylindrical device (generally angular) installed in the drill stem between the bottommost drill collar and a downhole motor. |
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| Global Geomagnetic Model (BGGM) is a mathematical model of the Earth's magnetic field in its undisturbed state. |
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| (Bottom Hole Assembly) portion of the drilling assembly below the drill pipe. It can be very simple, composed of only the bit and drill collars, or it can be very complex and made up of several specialty components. |
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| the cutting or boring element used in drilling oil and gas wells. |
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| Thick, heavy steel component of a conventional ram blowout preventer. In a normal pipe ram, the two blocks of steel that meet in the center of the wellbore to seal the well have a hole (one-half of the hole on each piece) through which the pipe fits. The blind ram has no space for pipe and is instead blanked off in order to be able to close over a well that does not contain a drillstring. It may be loosely thought of as the sliding gate on a gate valve. |
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| an uncontrolled flow of gas, oil, or other well fluids from the well. |
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| )- one or more valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and the drill pipe or in open hole |
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| Diameter of the hole penetrated by drill string |
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| A reference oil for the various types of oil in the North Sea, used as a basis for pricing. West Texas Intermediate (WTI) and Dubai are other reference oils. |
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| steel pipe placed in an oil or gas well to prevent the wall of the hole from caving in, to prevent movement of fluids from one formation to another and to aid in well control. |
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| the control valves, pressure gauges, and chokes assembled at the top of a well to control flow of oil and/or gas after the well has been drilled and completed. It is used when reservoir pressure is sufficient to cause reservoir fluids to rise to the surface. |
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| a coupling device used to join two lengths of pipe, such as casing or tubing. A combination collar has left-hand threads in one end and right-hand threads in the other. |
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| movement of tectonic plates toward each other, generating compressional forces and ultimately resulting in collision, and in some cases subduction, of tectonic plates |
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| a cylindrical sample taken from a formation for geological analysis. |
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| the fragments of rock dislodged by the bit and brought to the surface in the drilling mud. Washed and dried cuttings samples are analyzed by geologists to obtain information about the formations drilled. |
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| in areas where two 12-hour tours are worked, a period of 12 hours, usually during daylight, worked by a drilling or workover crew when equipment is being run around the clock. |
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Definition
| angle at which a wellbore diverges from vertical. |
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| surveying method that determines the direction and angle of formation dip in relation to the borehole. |
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| an abrupt change in direction in the wellbore, frequently resulting in the formation of a keyseat |
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| length of drill pipe, casing, or tubing consisting of two joints screwed together. |
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| The stationing of a vessel, especially a drillship or semisubmersible drilling rig, at a specific location in the sea by the use of computer-controlled propulsion units called thrusters. |
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Definition
| a heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem, used to stiffen the drilling assembly an put weight on the bit so that the bit can drill. |
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Definition
| Mainly responsible for hoisting equipment, but duties can extend to downhole conditions. |
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Definition
| he column, or string, of drill pipe with attached tool joints that transmits fluid and rotational power from the kelly to the drill collars and the bit. Often, the term is loosely applied to include both drill pipe and drill collars. |
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Definition
| An accumulation, pool, or group of pools of hydrocarbons or other mineral resources in the subsurface. |
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| an object that is left in the wellbore during drilling or workover operations and that must be recovered before work can proceed. |
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| recovering lost or stuck equipment in the wellbore. |
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| a crack or crevice in a formation, either natural or induced. See hydraulic fracturing. |
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| evice for measuring or maintaining orientation, based on the principles of conservation of angular momentum |
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Definition
| deviation from vertical, irrespective of compass direction, expressed in degrees. |
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| metal debris lost in a hole. |
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| the heavy square or hexagonal steel member suspended from the swivel through the rotary table and connected to the topmost joint of drill pipe to turn the drill stem as the rotary table turns. |
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Definition
| kickoff point)- the depth in a vertical hole at which a deviated or slant hole is started; used in directional drilling. |
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| (Lost Circulating Material)- substances added to drilling fluids when drilling fluids are being lost to the formations downhole. |
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| hy referenced by hx coordinates. |
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| measure the strength or direction of the Earth's magnetic field. |
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| added to a system (for example, makeup water used in mixing mud). |
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Definition
| length of the wellbore, as if determined by a measuring stick. differs from the true vertical depth of the well in all but vertical wells. Since the wellbore cannot be physically measured from end to end, the lengths of individual joints of drillpipe, drill collars and other drillstring elements are measured with a steel tape measure and added together. |
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Definition
Reliability is the probability of a product performing without failure, a
specified function under given conditions for a given period of time.
A unit of measure is Mean Time Between Failure ( |
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Definition
| existing wellbore close to a proposed well that provides information for planning the proposed well. |
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Definition
| any wellbore in which casing has not been set. No casing.No drill pipe or tubing is suspended. |
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Definition
| a special type of diamond drilling bit that does not use roller cones. |
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Definition
| to place cement in or near the bottom of a well to exclude bottom water, to sidetrack, or to produce from a formation higher in the well. |
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Definition
Poles are formed in relation to the path taken through the bar. Flow is from
negative (South) to positive (North). See
The Earth’s magnetic field (the geomagnetic field) has
a north and a south pole referred to as the magnetic poles. The magnetic
poles are located around one thousand miles from the geographic poles.
The geographic poles are located on the Earth’s spin or geographic axis,
and it is these poles that define the direction of “true north” and “true
south”. The angular separation of the geographic axis from the
geomagnetic axis is called the declination angle. |
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Definition
| Pounds per square inch to measure pressure. |
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Definition
| - the closing and sealing component on a blowout preventer. One of three types—blind, pipe, or shear—may be installed in several preventers mounted in a stack on top of the wellbore. Blind rams, when closed, form a seal on a hole that has no drill pipe in it; pipe rams, when closed, seal around the pipe; shear rams cut through drill pipe and then form a seal. |
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Definition
| enlarging the wellbore by drilling it again with a special bit. |
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Definition
| the electrical resistance offered to the passage of current; the opposite of conductivity. |
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Definition
| to dismantle a drilling rig and auxiliary equipment following the completion of drilling operations. |
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Definition
| to prepare the drilling rig for making hole, for example, to install tools and machinery before drilling is started. |
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Term
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Definition
In most drilling operations, the Rotary Table (RT) elevation is used as the
working depth reference (BRT or RKB). This is also referred to as derrick
floor elevation. |
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Definition
| (Rate of Penetration) - a measure of the speed at which the bit drills into formations, usually expressed in feet (meters) per hour or minutes per foot (meter). |
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Definition
| The principal component of a rotary, or rotary machine, used to turn the drill stem and support the drilling assembly. It has a beveled gear arrangement to create the rotational motion and an opening into which bushings are fitted to drive and support the drilling assembly. |
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Definition
| unskilled manual laborer on the rigsite. |
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Definition
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| an expendable substitute device made up in the drill stem to absorb much of the wear between the frequently broken joints (such as between the kelly or top drive and the drill pipe). |
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Definition
| to use a whipstock, turbodrill, or other mud motor to drill around the original planned path of the well. |
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| type of drilling that does uses mud to rotate the drill bit but does NOT rotate the drill string, used to change direction in the drilling |
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Definition
| To start the well drilling process by removing rock, dirt and other sedimentary material with the drill bit. |
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Definition
| Two or three single joints of drillpipe or drill collars that remain screwed together during tripping operations. |
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Definition
| Two or three single joints of drillpipe or drill collars that remain screwed together during tripping operations. |
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Definition
| Crude oil containing low levels of sulfur compounds, especially hydrogen sulfide [H2S]. |
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Definition
| (Total Depth)- maximum depth reached in a well. |
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Definition
| expendable threaded shape to mate with threads on drillstring and casing components.Protects the thread from damage when pipe is not in use. |
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Definition
| wellbore, usually openhole, where larger diameter components of the drillstring, such as drillpipe tool joints, drill collars, stabilizers, and the bit, may experience resistance when the driller attempts to pull them through |
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Definition
| hi-side of tool to be used as a reference point during measurments |
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Definition
| an employee of a drilling contractor who is in charge of the entire drilling crew and the drilling rig. Also called a rig superintendent, drilling foreman, or rig supervisor. |
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Definition
| e turning force that is applied to a shaft or other rotary mechanism to cause it to rotate or tend to do so. is measured in foot-pounds, joules, newton-metres, and so forth |
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Definition
| the operation of hoisting the drill stem from and returning it to the wellbore. v: to insert or remove the drill stem into or out of the hole. Shortened form of "make a trip." |
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Definition
| True Vertical Depth- vertical distance from a point in the well (usually the current or final depth) to a point at the surface, usually the elevation of the rotary kelly bushing (RKB). |
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Definition
| To part or break the drillstring downhole due to either fatigue or excessive torque. |
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Definition
| A reference oil for the various types of oil in the North Sea, used as a basis for pricing. West Texas Intermediate (WTI) and Dubai are other reference oils. A long steel casing that used an inclined plane to cause the bit to deflect from the original bore hole at a slight angle. |
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