I
Iadc
SEE: International Association of Drilling Contractors.
Ice Island
Large ice pieces of glacial or shelf ice origin.
Ice Slot
A manmade cut in an ice sheet. May be wet (completely through the ice), partially refrozen, or dry (partially through the ice).
Ice Structure
A gravity structure largely composed of natural and/or man made ice.
Ichnofossil
SEE: Trace Fossil.
Id
(1) Inside Diameter.(2) Identification/identifier.
Ideal Perforated Permeability
The ideal perforated permeability of a Berea sandstone core target is the calculated permeability to kerosine of the core target containing an ideal perforation at the outflow end based on the cross section and length of the Berea sandstone core used in determining the perforated effective permeability.
Identifier
A value assigned to distinguish an object from others. Identifiers are usually assigned by those authorized to do so and tend to conform to a convention.
Igneous Rock
Rocks formed by cooling and solidifying molten or partially molten material; i.e., lava flowing out of a volcano onto the earth's surface or by magma injecing itself into preexisting rocks below the surface of the ground.
Ignite
To cause to burn.
Ignitible Mixture
A gas and air mixture that is capable of being ignited by an open flame, electric arc or spark or device operating at or above the ignition temperature of the gas and air mixture.
Ignition
SEE: Explosive Limit; Ignitible Mixture.
Ignition Source
A source of temperature and energy sufficient to initiate combustion.
Ignition Temperature
The minimum temperature required, at normal atmospheric pressure, to initiate or cause self sustained combustion (independent of any externally heated element). Also referred to as autoignition.
Ignitor (thermowell)
Downhole ignitor used in fire flood operations.
Impact Loading
This loading results from sudden changes in the state of motion of components of the rig.
Impedance (acoustic)
SEE: Accoustic Impedance.
Impeller
The rotating element which converts rotational energy to head in a centrifugal pump.
Imperfect Thread Length
Threads having imperfect thread forms.
Imperfection
A discontinuity or irregularity in a product. Also referred to as flaw.
Impermeable
Preventing the passage of fluids. Lack of permeability.
Impervious
SEE: Impermeable.
Impervious Sheathed Cable
Cable constructed with an impervious metallic or nonmetallic overall covering that prevents the entrance of gases, moisture, or vapors into the insulated conductor or cable.
Implementation Plan
A document of the steps to be taken to ensure attainment of environmental quality standards within a specific time period. Implementation plans are required by various laws.
Impoundment
A body of water confined by a dam, dike, floodgate, or barrier; e.g., a pond.
Impression Block
A block with lead or another relatively soft material on the bottom. The block may be made up on drill pipe, tubing, or wireline at the surface, run into a wellbore, and allowed to rest on a tool or other object that has been lost in the wellbore. On retrieval to the surface, an idea of the size, shape and position of the fish is obtained from an examination of the impression left in the lead. This helps in selecting the appropriate fishing tools.
Improper Thread Form
An excessive deviation from a normal thread profile (in an axial plane) over a length of one pitch or over multiple pitch lengths.
Improper Thread Height
Lack of sufficient thread height (depth). This may be caused by a shaved condition where an excess of metal has been removed from the root or crest, distorting the contour of the thread.
Improvements Cost
The costs applicable to enhancements made to facilities ( does not include well operations).
In-kind
SEE: Take-In-Kind.
In-situ Combustion
The setting afire of some portion of the reservoir hydrocarbons in order that the gases produced by combustion will drive oil ahead of it to the wellbores of producing wells.
Inadequate Flash Trim
A condition in which height of weld flash after trimming exceeds the limits set in the specifications to which the pipe was manufactured.
Inadequate Ventilation
Ventilation which is less than adequate for safety purposes.
Inadequately Ventilated Area
An area that does not have the proper airflow to be considered adequate ventilation.
Incendiary Energy
Hot particle energy sufficient to ignite a specific ignitible mixture.
Inches/root Code
An indicator of whether the meter differential pressure is being reported in inches of water or in roots.
Incidence Angle
The included angle between the direction of the transmitted wave and the normal to the interface at the point of incidence.
Incident Of Noncompliance
A violation of Federal regulations as defined in Title 30 Code of Federal Regulations (CFR), as amended. The violation was noted by a Minerals Management Service (MMS) employee during an inspection of a platform, drilling rig, pipeline, etc., in OCS Federal waters.
Incident Report
A report that describes incidents of non-compliance.
Incineration
(1) The controlled process by which solid, liquid, or gaseous combustible wastes are burned and changed into gases.(2) The residue produced contains little or no combustible material.
Inclination Angle
SEE: Deviation Angle.
Inclination Data Certification Authorized Title
The job title of the authorized person representing the inclination company.
Inclination Data Company Name
The name of the company perorming the inclination survey.
Inclination Survey
SEE: Deviation Survey.
Inclination Surveyor Name
The name of the person pertforming the inclination survey.
Inclinometer
A device for measuring wellbore inclination and azimuth.
Included Angle
The angle between the flanks of the threads.
Inclusion
(1) Foreign material or nonmetallic particles entrapped within the metal during solidification.(2) A fragment of older rock within an igneous rock to which it may or may not be genetically related.
Incomplete Fusion
Lack of complete coalescence of some portion of the metal in a weld joint.
Incomplete Penetration
A condition where the weld metal does not continue through the full thickness of the joint. Also referred to as: Lack of Penetration.
Increased Density Order Assigned Date
Increased Density Order Number
Increased Density Order Number
A number identifying an order or authorization by a regulatory agency permitting one or more additional wells within a specific drilling and spacing unit.
Increment
The integral amount by which an index is changed to get to the next index value. An increment may be negative, but cannot be zero. If the index is a rational value, the increment refers to the change in the numerator.
Incremental Injection Rate
The rate of increase for the fluid or mineral being injected into a well.
Incremental Pricing Account
Account maintained by a pipeline which contains the costs subject to pass through to certain users.
Incrustation
The undesirable material which collects on interior walls of production vessels such as separators, meters, tanks, etc., reducing internal dimensions or capacity. Paraffin, gyp, etc., are examples.
Indefinite Pricing Clause
Any provision of any contract which provides for the establishment or adjustment of the price for natural gas delivered under such contract by reference to other prices for natural gas, crude oil or refined petroleum products, or allows for the establishment or adjustment of the price of natural gas delivered under any contract by negotiation between the parties.
Indented Drill Collar
Round drill collar with a series of indentations on one side to form an eccentrically weighted collar.
Index
(1) A price calculated by private industry publications, through bid week price surveys, for natural gas delivered at regional locations into major pipelines.(2) A pointer which changes incrementally to indicate position along a scale, as in a depth index along a depth scale.
Index Fossil
A fossil that identifies the geologic age of a formation or the top of a geologic unit.
Indian Agency Code
The indicator identifing an individual Indian Agency within a tribe or area.
Indication
A response from nondestructive inspection that requires interpretation in order to determine its significance; i.e., blip on the log; powder buildup on the pipe.
Indicator
(1) Various displays of pressure, weight, temperature, volume, flow, direction, current, or movement.(2) A device for indicating a condition, a current or potential. Typical ones used on inspection instruments are galvanometers, meters both De Arsenval or digital, Cathode Ray Tube (CRT) or a warning light. Also referred to as readout.(3) Substances in acid base titrations which, in solution, change color or become colorless as the hydrogen ion concentration reaches a definite value, these values varyi
Indirect Charge
SEE: Overhead.
Indirect Cost
SEE: Overhead.
Indirect Fired Vessel
A vessel used to increase the temperature of a fluid by the transfer of heat from another fluid which is heated by a flame in the same vessel. The flame is contained within a firetube or tubes.
Indirect Heated Component
A vessel or heat exchanger used to increase the temperature of a fluid by the transfer of heat from another fluid, such as steam, hot water, hot oil or other heated medium.
Indirect Heated Vessel
SEE: Indirect Heated Component.
Induced Gamma Ray Spectroscopy Log
A record of formation response to neutron bombardment. Measurements are used to compute the hydrocarbon saturation, salinity, lithology, porosity and shaliness of the formation. Also referred to as: carbon-oxygen log, induced spectral gamma-ray log or neutron activation log.
Induced Permafrost
Permafrost caused by thermal disturbance from construction or operation at the planned installation site.
Induced Polarization
An exploration method involving measurements of the slow decay of voltage in the ground following the cessation of an excitation current or low frequency variation of earth impedance.
Induction
The magnetism induced in a ferro-magnetic body by an outside magnetizing force.
Induction Log
A well log which uses electromagnetic induction principles for the measurement of rock conductivity or resistivity.
Inert Gas
A noncombustible gas that does not react readily with other substances under ordinary conditions. It generally contains a large percentage of nitrogen and is sometimes used for repressuring or gas injection operations.
Infiltration
The flow of a fluid into a substance through pores or small openings. Commonly used in hydrology to denote the flow of water into soil material.
Inflow Performance Relationship
The relationship of flowing bottomhole pressure to gross liquid producing rate for a particular well completion. Referred to as IPR.
Informal Stratigraphy
The branch of Stratigraphy dealing with the relative ordering of rock strata, using formal stratigraphic nomenclature and guidelines.
Initial Adjustment Total Amount
The initial revised value after adjustments are applied.
Initial Boiling Point Temperature Measurement
The temperature reading which is observed at the instant drop of condensate forms at the lower end of the condenser tube.
Initial Contract Price Or Percentage
The initial rate or the initial decimal used to calculate a contract minimum price.
Initial First Flowing Pressure Measurement
The initial flowing pressure measurement recorded for the well test flowing phase having a well test phase sequential discriminator indicating the phase is the first of multiple well test flowing phases.
Initial Flowing Pressure
The first flowing pressure measurement recorded during a well test flowing phase.
Initial Flowing Tubing Pressure Measurement
The initial flowing pressure measurement recorded in the tubing during a well test flowing phase.
Initial Gas Oil Ratio
The initially reported standard cubic feet (SCF) of gas produced divided by the barrels of stock tank oil (STO).
Initial Hydrostatic Pressure Measurement
The initial hydrostatic pressure measurement recorded during the well test installation phase.
Initial Maximum Shut- In Pressure Measurement
SEE: Initial Shut-In Pressure.
Initial Modified Lahee Class
The initial modified well classification, according to the Lahee well classification system.
Initial Open Time
The time stamp recorded at the beginning of a well test flowing phase.
Initial Open Time Interval
The time interval recorded for the well test flowing phase having a well test phase sequential discriminator indicating the phase is the first of multiple well test flowing phases.
Initial Potential
The results of an initial potential test of a well completion.
Initial Potential Test
The first potential test of a well completion. Usually required by a regulatory agency.
Initial Pulse
The first indication which may appear on the screen. This indication represents the emission of ultrasonic energy from the crystal face (main bang).
Initial Second Flowing Pressure Measurement
The initial flowing pressure measurement recorded for the well test flowing phase having a well test phase sequential discriminator indicating the phase is the second of multiple well test flowing phases.
Initial Set
Cement shall be considered to have acquired its initial set when it will bear, without appreciable indentation, the initial Gillmore needle. This is not an API test. See ASTM C 266: Time of Setting of Hydraulic Cement by Gillmore Needles.
Initial Shut- In Pressure Measurement
The first shut- in pressure measurement recorded during a well test shut- in phase.
Initial Shut- In Pressure Time
The time stamp at the recording of an initial shut- in pressure measurement.
Initial Shut- In Tubing Pressure Measurement
The initial shut-in pressure measurement recorded in the tubing during a well test shut-in phase.
Initial Static Reservoir Pressure Measurement
The first static reservoir pressure measurement recorded during the well test static reservoir pressure phase.
Initial Water Saturation
The average original fractional water saturation in a reservoir.
Initial Well Class
The initial well classification, according to a well classification system.
Injected Gas Oil Ratio
The ratio between the volume of gas injected and the volume of oil produced.
Injection
The condition of forcing a flow of fluids into the reservoir.
Injection Cycle Number
A number assigned to each cycle phase of injection which permits the tracking of cyclic injection used in tertiary projects. Regular waterflood projects are recorded as cycle number zero. Only those projects which are in a cycle of alternating injection substances will be assigned a number other than zero.
Injection Cycle Start Date
The date the injectant was first injected into the well completion.
Injection Daily Average Gas Volume
The daily average gas volume injected into a borehole; this does not include gas-lift injection volumes.
Injection Daily Average Liquid Volume
The daily average volume of oil or water injected into a borehole; this does not include gas-lift injection volumes.
Injection Date
The date the injection process began.
Injection End Date
Ending date of the period the given volume was injected.
Injection Facility
A facility that treats fluid and pressurizes it for injection (or disposal).
Injection Flag
An indicator of whether the reported volumes are net reservoir numbers.
Injection Fluid
Fluid that is input through a well completion into a reservoir for purposes of enhanced recovery or pressure maintenance.
Injection Fluid Density
Density of this particular injection fluid at reservoir temperature and pressure.
Injection Fluid Specific Gravity
Specific gravity of this particular injection fluid.
Injection Fluid Temperature
The temperature of the injection fluid at the surface.
Injection Fluid Type
The type of fluid injected into a well completion.
Injection Fluid Viscosity
The measured viscosity of the injection fluid at reservoir temperature.
Injection Fluid Volume
The volume of fluids injected into a reservoir through one or more well completions as a part of a pressure maintenance, secondary recovery, or recycling operation.
Injection Gas
Gas put into a reservoir for purposes of cycling, maintaining reservoir pressure, displacing liquids, or storage.
Injection Gas Volume
The volume of gas injected into a borehole. This does not include gas-lift injection volumes.
Injection Head
Uppermost control on a water injetion well.
Injection Liquid Volume
The volume of oil or water injected into a borehole; this does not include gas-lift injection volumes
Injection Oil Bubble Point Pressure Measurement
The measured bubble point pressure for the oil phase.
Injection Oil Bubble Point Pressure Temperature
The temperature at which the indicated bubble point pressure is effective.
Injection Pattern
The spacing and pattern of well surface locations in an enhanced recovery project. The more common injection patterns include line drive, five spot, seven spot, nine spot, and peripheral.
Injection Pressure Measurement
The pressure under which fluid is injected into a well.
Injection Pressure Of Fluid After Work
The surface measurement of injection pressure into a well completion, after work has been performed on the completion; applicable to service wells only.
Injection Pressure Of Fluid Before Work
The surface measurement injection pressure into a well completion, before work is performed on the completion; applicable to service wells only.
Injection Pump
A pump that: (1) injects chemcals into a flow line system for the purpose of treating emulsions or corrosion;(2) injects liquids underground for disposal or to enhance recovery.
Injection Rate
The flow rate of fluids injected into a reservoir.
Injection Rate After Horizon Work
The injection rate of fluid into the identified horizon, after work has been performed on the horizon. This element is applicable to injection, disposal and service wells only.
Injection Rate Before Horizon Work
The injection rate of fluid into the identified horizon, before work is performed on the horizon. This element is applicable to injection, disposal and service wells only.
Injection Total Gas Volume
The total volume of gas injected during the period covered.
Injection Total Monthly Gas Volume
The total monthly gas volume injected into a borehole; this does not include gas-lift injection volumes.
Injection Total Monthly Liquid Volume
The total monthly liquid volume injected into a borehole; this does not include gas-lift injection volumes.
Injection Total Oil/ Condensate Volume
The total volume of oil and or condensate injected during the period covered.
Injection Total Water Volume
The total volume of water injected during the period covered.
Injection Volume
The volume of oil, gas, or water injected into a borehole. This may include fluids injected for the purpose of disposal.. Does not include gas-lift injection volumes.
Injection Water Dissolved Solids
The total dissolved solids content for injection water.
Injection Water Resistivity
Resistivity measured as a part of particular injection water.
Injection Water Undissolved Solids
The total undissolved solids content for injection water.
Injection Well
A well used to introduce fluids into a reservoir, usually for enhanced recovery.
Injectivity Test
A well test to determine the injection rate a given pressure.
Injector
Device for adding liquids, chemicals, etc., to a system by driving force.
Ink Blob
An early method of measuring inclination of a borehole axis.
Inlet
The actual opening through which the feed enters the device.
Inline
For 2D seismic data, direction along the survey line. If the line is not straight, the inline direction will change. For 3D seismic data, a direction within the data set designated as the inline direction. Possible directions are in the direction in which the cable was laid or the direction in which the survey boat sailed. It may be some arbitrary direction. The sense of the inline direction is such that the inline indexes increase in the positive inline direction.
Inline Traverse
A collection of seismic traces from a 3D survey in which the bin node crossline index remains constant.
Input Gas
That gas which is compressed and returned to a wellbore to be used for gas lift or as injection gas for pressure maintenance.
Input Horsepower
The horsepower that is put into an operating system.
Input Well
SEE: Injection Well.
Inside Blowout Preventer
A device that can be installed in the drillstring that acts as a check valve allowing drilling fluid to be circulated down the string but prevents back flow.
Inside Diameter
The nominal inside diameter of the body of the given tubular product. Commonly abbreviated as ID.
Inside Pressure Measurement
The pressure measured inside the drillstring or vessel.
Inspection Spool
A short length of pipe inserted in a pipeline in such a manner that it is easily removed for inspection. It should be of the same material as the remainder of the pipeline.
Inspector Name Code
An indicator of the authorized agent of the purchaser, operator, regulatory agency, etc.
Insulated Flange
A flange which contains insulating material to separate the metal parts. Also referred to as insulating flange.
Intake Flame Arrestor
A device placed on the air intake of the firetube to prevent propagation of flame from inside the firetube to the outside atmosphere.
Intangible Aircraft Expense
Cost of helicopters and planes used to service drilling operations.
Intangible Auto And Truck Expense Amount
Cost includes the rental or operating costs of automobiles and trucks for the hauling of equipment, material, and personnel.
Intangible Bit And Core Barrel Cost
Cost of drilling bits and the use and repair of core cutting equipment.
Intangible Cement And Cementing Services Cost
Cost of cement and cementing services for cementing casing in the well, to include but not limited to additives, floats, collars, centralizers, and guide shoes.
Intangible Communication Equipment Cost
Cost of various communications systems including radio, telex, microwave and rig telephones.
Intangible Company Labor And Expense Cost
Cost associated with salaries, wages, and expenses paid to company personnel performing work or supervising work directly in connection with drilling operations.
Intangible Contract Labor Cost
Cost includes labor furnished by contractors for performance of work incident to drilling not specifically mentioned in another intangible cost category.
Intangible Drilling Dayrate Cost
Costs paid to a contractor for drilling a well at a specified price per day.
Intangible Drilling Footage Cost
Costs paid to a contractor for drilling a well to a certain depth at a specified price per foot.
Intangible Drilling Turnkey Cost
Cost paid to a contractor for all services incurred to perform a specified job.
Intangible Formation Testing Cost
Cost of taking and recording physical measurements about the formations being drilled including well surveys, electric logs, sidewall cores, drillstem tests, and directional surveys.
Intangible Fuel And Power Cost
Cost of diesel fuel, gas, and purchased utilities used during drilling operations.
Intangible Geological Services Cost
Cost associated with geological services for duties such as core analysis, and palentological services.
Intangible Location Cost
Costs in connection with the building of roads, bridges, canals to a drilling location including bulldozers, barges, drag lines, shale, gravel, and lumber. This classification also includes surface damage payments made to landowners caused by drilling operations and location restoration.
Intangible Marine Transportation Cost
Cost includes crew boats, barges, and other marine transportation used to transport equipment, material, and personnel.
Intangible Miscellaneous Expense
Intangible costs not identified elsewhere.
Intangible Mud Logging And Materials Cost
Costs of drilling mud and related material, such as bentonite weighting material, lost circulation material, chemicals, and crude oil used to condition the hole or maintain circulation. Also included are mud logging services provided by contract or company personnel.
Intangible Overhead Cost
Cost includes the flat rate or percentage amount assessed in lieu of district expense and administrative overhead, in accordance with provisions of the Accounting Procedure Exhibit of the operating agreement.
Intangible Payroll Burden Cost
Cost for vacation, sickness and disability, and other similar allowances applicable to employees serving drilling operations, as well as the current cost of group insurance, pension, retirement, and other benefit plans of like nature applicable to company labor charged to the well.
Intangible Perforating Cost
Cost to penetrate through the casing opposite the producing formation to allow the oil or gas to flow into the borehole.
Intangible Rental Equipment Cost
Cost of various rental equipment which is not included in a specific category.
Intangible Rig Mobilization And Demobilization Cost Costs Of Moving The Rig To Location (mi), Setting The Rig Over The Hole (ru), Dismantling The Rig (rd), And Moving The Rig From Location (mo).
Intangible Stimulation Treatment Cost
Cost of various acidization, fracturing, or squeezing procedures necessary to break down the formation in order to obtain production.
Intangible Tubular Inspection And Treatment Cost
Expenditures incurred inspecting and treating casing, tubing, and other tubulars to insure compliance with designated specifications.
Intangible Water And Water Well Cost
Cost to drill and monitor water wells for use in drilling operations.
Integrating Meter
A meter that calculates, records and gives instantaneous readout of throughput volumes or rates.
Integrator
A device which scans pen measurements on gas charts and converts them into production rates for calculating volume settlement.
Integrity Test Pressure Measurement
The surface pressure applied to verify the mechanical integrity of the tubular.
Intentional Deviation Flag
An indicator of whether there is intentional deviation.
Interest Acquisition Date
The date that the indicated company acquired its interest in the property pr zone or, under appropriate conditions as indicated by the acquisition type, that the company has no interest in the zone.
Interest Acquisition Type
Used to provide a permanent record of the manner in which the indicated company acquired its interest in the zone or, under appropriate conditions, to indicate that it has no interest in the property or zone. Associated with acquisition date; e.g., company nonconsent; back in; working interest; drilling; development.
Interest Amount
The interest calculated for late payment and or reporting.
Interest Calculation Method
Indicates how an owner's portion of lease money is to be computed; e.g., Regular decimal (value less tax); Regular interest credit; Regular interest gas purchase; Tax exemption (state); Tax exemption (Federal excise tax on crude oil).
Interest Calculation Method Code
An indicator of the method used to calculate an interest rate or amount.
Interest Limitation
Description of how interests are owned as limited by depths, tracts, products owned and encumbrances to those interests; e.g., Overriding Royalty Interests (ORI's); production payments.
Interest Period End Date
The date the accrual of interest ends.
Interest Period Start Date
The date the accrual of intere begins.
Interest Rate
The percentage rate of interest applied to delinquent payments.
Interest Refund Provision Flag
An indicator of whether or not the contract contains a provision dealing with interest on refundable amounts.
Interest Suspension Date
The effective date an owner's interest was put into a suspense status instead of pay status.
Interest Type Code
An indicator of the kind of interest an owner has in a property; e.g., Royalty interest; Working interest; Overriding royalty interest; Production (bonus) payment interest; Carried interest; Net profit; Mineral interest (owner holds royalty interest and working interest); Royalty adjust.
Interface Drain
A pipe connection extending to the normal interface level with a vortex breaker which is used periodically to drain off any accumulated sludge.
Interfacial Tension
The force required to break the surface between two immiscible liquids. The lower the interfacial tension between the two phases of an emulsion, the greater the ease of emulsification. When the values approach zero, emulsion formation is spontaneous.
Intermediate Casing
The string of casing set in the wellbore after the surface casing is set in order to keep the hole from caving. Also referred to as: Protection Casing.
Intermediate Column
Vertical, cylindrical or multifaceted buoyancy members of the hull structure, which primarily assist in deck and/or pontoon support.
Intermediate Deck
Deck levels between lower deck and upper deck consisting of girder, beam and plate elements.
Intermediate Girder
Primary deck elements spanning between main girders.
Intermittent Flow
Gas lift operation in which gas is injected periodically into the liquid column, with reservoir fluids and injected gas being produced from the wellhead at the surface for an interval of time following each injection period.
Intermittent Gas Lift
Pressurized gas injected at intervals of time into tubing downhole at a point below top of fluid in tubing to lift slugs of fluid to surface.
Intermitter
A surface control which may be adjusted and set to operate a motor valve at predetermined intervals of time and also control the duration of the operating or injection period.
Internal Mute
A time window which is to be or has been muted (zeroed). Note that zero is considered to be a valid value. A window which has been muted does not have any acquired information in the window even though non-zero values may be placed into a muted window subsequent to application of the mute. A gain taper may have been applied to unmuted data on each side of the muted window to prevent edge effects from sudden changes in amplitude.
Internal Thread
A thread on the inside surface of a coupling or pipe.
International Association Of Drilling Contractors
The International Association of Drilling Contractors (IADC) is an organization that defines and classifies drilling bit characteristics.
Interrupted Starting Thread
The absence of a portion of the true starting thread groove on the chamfer of a round or buttress (pipe thread) caused by thread axis misalignment with the chamfer axis, or out of round chamfer diameter.
Interstate Pipeline
Any party engaging in natural gas transportation subject to the jurisdiction of the Federal Energy Regulatory Commission (FERC) under the Natural Gas Act.
Interstate Rollover Contract
Under the Natural Gas Policy Act (NGPA), 1978, as amended, a rollover contract for gas which was committed or dedicated to interstate commerce on November 8, 1978, including any contract that rolled over prior to the date of enactment.
Interstitial Water
Water contained in the interstices or voids of formations.
Interval
The measured distance or time between two values or other reference points. Interval refers to nonindexed information. In a general context, an interval may be unbounded with only one reference point defined.
Interval Cement Fracture Percentage
The percentages of healed, cemented and filled fractures in a depth interval.
Interval Transit Time
The travel time of a compressional wave (usually) over a unit distance, hence proportional to the reciprocal of compression wave velocity.
Interval Velocity
The ratio of any length interval to the corresponding interval transit time.
Intrastate Pipeline
Any party engaged in natural gas transportation (not including gathering) which is not subject to the jurisdiction of the Federal Energy Regulatory Commission (FERC) under the Natural Gas Act.
Intrastate Rollover Contract
Under the Natural Gas Policy Act (NGPA), 1978, as amended, a rollover contract for gas that was not committed or dedicated to interstate commerce on November 8, 1978.
Intrinsically Safe System
An electrical system which is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture in its most easily ignitible concentration.
Invert Emulsion
A water in oil emulsion where fresh or salt water is the dispersed phase and diesel, crude, or some other oil is the continuous phase. Water increases the viscosity and oil reduces the viscosity.
Inverter
A device that alters or changes electrical voltage.
Invoice Code
An indicator of the type of invoice.
Invoice Date
The date the invoice is issued.
Invoice Due Date
The date payment for an invoice is due.
Invoice Number
The number assigned that uniquely identifies an invoice.
Invoice Reason Code
An indicator of the reason for the issuance of the invoice.
Invoice Remark
Textual information pertaining to the invoice.
Invoice Toal Amount
Invoice Type Code
An indicator of the type of invoice.
Iodine Number
Indicates the amount of iodine absorbed by oils, fats, and waxes, giving a measure of the unsaturated linkages present. Generally, the higher the iodine number, the more severe the action of the oil on rubber.
Ion
Electrically charged particle, atom, or radical.
Ion Exchange
A reversible exchange of ions. In water and waste water treatment, the solids (ion exchange resins) exchange the polluting ions in the water for ions originally on the resin.
Ionization Chamber
An instrument that detects and measures ionizing radiation by observing the electrical current created when radiation ionizes gas in the chamber, making it a conductor of electricity.
Ip
SEE: Initial Potential; Induced Polarization.
Iron Sponge Unit
SEE: Treater.
Irs State Of Production Readiness Date
The date when all casing, tubing, packers, and the Christmas tree are installed. This represents the definition of a completed well by the Internal Revenue Service (IRS).
Island Building
The installation, construction, and maintenance of an island, glory hole, or berm for the purpose of conducting drilling operations and the dismantlement and/or clean-up of such island, glory hole, or berm following conclusion of the drilling program, and all activities associated therewith including any related environmental studies.
Isogonic Chart
A chart showing lines of equal magnetic declination.
Isotope
Atoms with the same atomic number (same chemical element) but different atomic weights.
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