Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Trenching
Definition(s)
Trenching
"Trenching" means the practice of constructing trenches in or adjacent to a pit for the purpose of relocating all or a portion of the solids so as to facilitate closure. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsTreatable Water
Definition(s)
Treatable Water
"Treatable water" means, for purposes of setting surface casing and other casing strings, subsurface water in its natural state, useful or potentially useful for drinking water for human consumption, domestic livestock, irrigation, industrial, municipal, and recreational purposes, and which will support aquatic life, and contains less than 10,000 mg/liter total dissolved solids or less than 5,000 ppm chlorides. Treatable water includes, but is not limited to, fresh water. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSulfide Stress Cracking
Definition(s)
Sulfide Stress Cracking
Cracking of metallic materials due to exposure to fluid containing hydrogen sulfide. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsSulfide Stress Cracking
Cracking of metallic materials due to exposure to hydrogen sulfide containing fluids. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsSulfide Stress Cracking
"Sulfide stress cracking" means the cracking phenomenon which is the result of corrosive action of hydrogen sulfide on susceptible metals under stress. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSulfide Stress Cracking
The cracking phenomenon which is the result of corrosive action of hydrogen sulfide on susceptible metals under stress. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsSubnormal Pressure
Definition(s)
Subnormal Pressure
"Subnormal pressure" means the formation pore pressure, proportional to depth, which is less than a hydrostatic pressure gradient of .465 psi/ft. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSpill Containment Pit
Definition(s)
Spill Containment Pit
"Spill containment pit" mean a permanent pit which is used for the emergency storage of oil and/or saltwater spilled as a result of any equipment malfunction. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSoil Farming
Definition(s)
Soil Farming
"Soil farming" means the application of oilfield drilling or produced wastes to the soil for the purpose of disposing of the waste without being a detriment to water or land; also known as land application. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSodium Absorption (SAR)
Definition(s)
Sodium Absorption (SAR)
"Sodium Adsorption Ratio (SAR)" means the index which indicates the relative abundance of sodium ions in solution as compared to the combined concentration of calcium and magnesium ions. It is calculated as follows: SAR = (Na ppm/23.0) / sq. root of [{(Ca ppm/20.02) + (Mg ppm/12.16)} / 2] where Na=Sodium, Ca=Calcium. Mg=Magnesium. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSlit Trench
Definition(s)
Slit Trench
"Slit trench" means a pit or bermed area at the drilling site used for the temporary storage of drilling fluids and/or cuttings to provide access for equipment to remove the contents off site. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSlick Spot
Definition(s)
Slick Spot
"Slick spot" means a small area of soil having a puddled, crusted, or smooth surface and an excess of exchangeable sodium. The soil is generally silty or clayey, is slippery when wet, and is low in productivity. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsSeparator
Definition(s)
Separator
Horizontal, vertical, or spherical vessel used to remove liquid from gas, and gas from liquid. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsSeparator
"Separator" means any apparatus for separating oil, gas, and water as they are produced from a well at the surface. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsReuse
Definition(s)
Reuse
"Reuse" is the introduction (or reintroduction) into an industrial, manufacturing, or disposal process of a material which would otherwise be classified as a deleterious substance. A material will be considered "used or reused" if it is either:- Employed as an ingredient (including use as an intermediate) in an industrial, manufacturing, or disposal process to make or recover a product.
- Employed in a particular function or application as an effective substitute for a commercial product or non-deleterious substance.
Reuse
Reuse means the activity of recovering components and materials for further use without reprocessing. Source: Resolution MEPC.219(63), 2012 Guidelines for the Implementation of MARPOL Annex V, 2 March 2012, International Maritime Organization. Regulatory GuidanceReuse
To employ hazardous waste as an ingredient in an industrial process to make a product (other than recovery of distinct components of hazardous waste as separate end products) or effective substitution of hazardous waste for a commercial product used in a particular function or application. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsReservoir Pressure
Definition(s)
Reservoir Pressure
"Reservoir pressure" means the static or stabilized pressure in pounds per square inch existing at the face of the formation of an oil or gas well. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsRemediation Pit
Definition(s)
Remediation Pit
"Remediation pit" means a pit which is used for the handling, storage, or disposal of deleterious substances and/or soils contaminated by deleterious substances which are relocated to the pit for the purpose of remediating a site which is known to be or suspected to be causing pollution. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsRe-Enter or Reentry
Definition(s)
Re-Enter or Reentry
"Re-enter" or "re-entry" is the act of entering a plugged well for the purpose of utilizing said well for the production of oil or gas, for the disposal of fluids therein, for a service well, or for the salvaging of tubing or casing therefrom. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsRecycling/Reuse Pit
Definition(s)
Recycling/Reuse Pit
"Recycling/reuse pit" means a pit which is used for the recycling or reuse of deleterious substances, is located off-site, and is operated by the generator of the waste. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsRecycling
Definition(s)
Recycling
"Recycling" is the reuse, processing, reclaiming, treating, neutralizing, or refining of materials and by-products into a product of beneficial use which, if discarded, would be deleterious substances. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsRecycling
Recycling means the activity of segregating and recovering components and materials for reprocessing. Resolution MEPC.219(63), 2012 Guidelines for the Implementation of MARPOL Annex V, 2 March 2012, International Maritime Organization. Regulatory GuidanceRecomplete Or Recompletion
Definition(s)
Recomplete Or Recompletion
"Recomplete" or "recompletion" means any operation to:- Convert an existing well from an injection well or disposal well, to a producing well, or
- Add or change common sources of supply in an existing well.