Glossary of Oilfield Terms and Definitions for Oilfield Terminology
Adaptor Flange | An intermating flange that connects between two other flanges that are different connection types from each other. Two types are available:- Double Studded Adaptor (DSA), or a Single Studded Adaptor (SSA). |
Adaptor Spool | A pressure control housing body with two different end connections to fit between two other pieces of equipment. Can often be used instead of a Double Studded Adaptor because at least one of the components to which it connects has a studded flange connection. |
ANSI | American National Standards Institute. (Formerly known by the name American Standards Association) (ASA). This organisation sets standards for ASME:- ANSI B16.5, Weld Neck, Blind and Screwed Flanges commonly used in refineries and process industries. |
Annular | Refers to the space between the inside diameter of a cased or drilled hole and a secondary string of casing suspended inside this space. |
API | American Petroleum Institute. The organisation that develops and publishes API specifications. |
API 16A | (Also ISO 13533) American Petroleum Institute publication specification used as the industry Specification for Drilling Equipment. |
API 6A | (Also ISO 10423) The American Petroleum Institute publication specification utilised as the oil industry Specification for Wellheads and Christmas Tree Equipment. |
API Monogram | The registered trademark of the American Petroleum Institute (API). Qualified licensed manufacturers are authorised to use the API Monogram and their license number, on their documentation and on product labels to signify equipment meets the requirements of API specifications. |
API 17D | The American Petroleum Institute specification used for Subsea Wellhead and Christmas Tree Equipment. |
ASTM | American Society for Testing and Materials. The organisation providing a vast array of specifications for test standards, methodology and materials. |
Austenitic Stainless Steel | 300 series stainless steel (example 316, 304, 321) with a chemical composition of chromium 16% minimum, nickel, 8% minimum, and carbon .08% maximum. |
B7, B7M | ASTM specification for bolting, A193 Grade B7, specified in API Spec 6A for standard service flange bolting. B7M is B7 Modified with controlled hardness (charpies tested) in the bolt (and 2HM nut) for sour service (NACE) exposed bolts. |
BHN | Abbreviation for Brinell Hardness Number. (New abbreviation is now:- HBW). |
Bolt Circle | The dimension of a theoretical circle through the center point of a series of holes, drilled equally spaced, near the mid circumference of a flange. |
Bolting Tension | The energy resulting from applying Torque to nuts onto bolts/studs providing the required compressive force to hold connections in contact under pressure or load. |
Bolting Torque | The rotational force applied to nuts onto stud bolts required to tighten and apply tension to the bolts in order to hold flanges or other connections. |
BOP | An Abbreviation for Blowout Preventer. |
Braden Head | |
Break-out | To Break apart; to disconnect flanged or screwed Connectors. |
Brinell Hardness | A measure of steel hardness, measured by pressing a tungsten carbide tool against a surface using a designated force, producing an impression which is measured and then given a special numerical value which relates to steel tensile strength. API 6A specifies minimum Brinell Hardness requirements. NACE MR-0175 references maximum hardness in determining steel’s suitability for use in H2S Service. |
Buffer Chamber | (Header) pressure vessel with multiple inlets and outlets, utilised to contain and direct the discharge from Chokes in a drilling Manifold system. |
Butt Weld Joint | A form of weld joint having specially prepared surfaces that makes a ‘Full Penetration Weld’. A small gap between the adjacent pieces of pipe or fittings is left then deposited weld metal will bridge, fill, and close. |
Butt Weld Fitting | Any fitting that has Butt weld ends. |
BX | |
Carbon Steel | Iron based metal with carbon and manganese added to specific limits. Only residual small amounts of other elements are added for deoxidisation or to control the effects of sulphur. |
Casing | Oilwell Pipe used to line the bore hole of a well. |
Casing Spool | A piece of well control equipment attached below the Casing Head, used to suspend and seal a secondary casing string with casing slips. |
Casing Head | A piece of well control equipment (flanged, welded or hub clamp) attached to the top of surface casing, allowing the attachment of Blowout Preventers during the drilling, phase and later used to hang and suspend a secondary string of casing set inside hung on a set of casing slips. |
Cast Steel | Steel manufactured by pouring molten steel into a metal or wooden meld to produce the desired shape after solidification and cooling. |
Casting | A shape made from cast steel. |
Charpy V-Notch Test | A test performed (at a nominated temperature) utilising a calibrated falling pendulum (hammer) fracturing a Specimen of Material and measuring the force required. |
Choke | Pressure control equipment (choke valve) used to restrict and regulate the flow of well fluids to maintain a desired pressure and flow rate. Chokes typically have hardened internal replaceable parts specifically designed to resist erosion caused by high pressure, high velocity or abrasive fluids typically used as part of a Choke Manifold or Xmas Tree. |
Choke Manifold | A complete assembly of valves, Fittings, Flanges and Chokes configured to control and regulate the flow of fluid from a well bore. |
Christmas Tree | A complete assembly of Gate Valves and studded outlets and a top connector etc. used to regulate and control the flow of oil and gas during well production. |
Clamp Hub | ‘Hub Clamp Connector’ a type of end connector documented in API Spec 16A that joins with a hub and attaches with a Clamp. |
Combination Adaptor Ring Gasket | A custom Ring Gasket that allows two flanges with different ring grooves to join and seal when Made-up. These gaskets are also available with different pitch diameters on each side of the gasket. |
Concentric Reducer | A pipe fitting that reduces from a larger to a smaller size on each end. Available in threaded (swage nipple) or butt weld preparations, with the ends concentric along a common axis. |
Connector | Pressure containing / pressure controlling wellhead equipment that allows a mechanical joint that can provide a pressure seal can be Flange, Hub, Union connection. |
Corrosion Resistant Ring Grooves | (CRA) Ring Grooves can be lined (overlaid) with corrosion resistant material such as either CRA (Like 410SS) or an austenitic stainless steel. |
Corrosion Resistant Alloy | Non ferrous alloys where the total sum of the specified amount one or more of the following alloy elements exceeds 50%: cobalt, chromium, titanium, molybdenum, Nickel often used in critical service applications for flanges, spools, valves etc. |
Corrosion Resistant Material | Nonferrous or Ferrous alloys, more corrosion resistant than low alloy steels. Examples:- Stainless Steels, Duplex Steel, CRA’s etc. |
Cross | A Fitting with four connections in the same plan with two of these connections forming an in-line run. Crosses can also be 5 Way and 6 Way. |
Cross-over Fitting | Any pipe fitting, or component, having two different end connection types such as, e.g. line pipe one end X 8 Round Tubing Threads other end, male or female, and various sizes and combinations of male or female connectors, in various connection types. |
Coupling | Joins to pieces of pipe or casing female both ends. A reducing coupling joins two different sizes, female both ends. |
Double Extra Strong | (XXS ) also referred to as Double Extra Heavy (XXH); A designation of pipe with a wall thickness twice that of Extra Strong Pipe. |
Double Studded Adaptor | (DSA) A flange with a through bore and a ring groove on each side, drilled and tapped bolt hole sets on both sides and tapped end studs complete with nuts fitted on both sides. The two sides are different in size and/or pressure rating. (If they are the same it is just a ‘spacer’). Utilised to adapt between different flange end connections. |
Drift | A gauge of special dimensions used to pass through the Run of (minimum bore) equipment to prove that the bore of the run will pass working tools. |
Drilling Choke | A Choke designated by its manufacturer as suitable for drilling service, (utilised as part of Choke Manifold). |
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