- 3D Seismic, Three Dimensional Seismic
- Exploration technology, three dimensional seismic (3-D)
images show the height, width and depth of underground
- Abandoned Well
- A well no longer in use, whether dry, inoperable
or no longer productive, and the previous operator has intentionally
relinquished its interest in the well.
- Abstract number
- Abstract number assigned to the survey where the proposed surface
location lays. The Texas General Land Office assigned
the number to the surveyed parcel at the time of patenting (Example:
term _abstract_ refers to an original land survey
describing an area transferred from the public domain by either the
Republic of Texas
or the State of Texas. These surveys are recorded
in the "State
Abstract of Land Titles," which is maintained by the Texas General
Land Office. Each survey so recorded is assigned an abstract number,
which is unique within the county in which the survey falls. Because
Texas has never performed a uniform statewide land survey, these original
surveys called "Patent Surveys " constitute the State's
Official Land Survey System.
- Acre Feet
- Unit of volume; one acre of producing formation one foot thick. One
acre foot equals 7,758 barrels, 325,829 gallons or 43,560 cubic feet.
- Adjacent Estuarine Zones
- This term embraces the area inland from the coastline of Texas and
is comprised of the bays, inlets, and estuaries along the gulf coast.
- Administrative Penalty
- Statutory penalty imposed by the RRC for violation of a rule.
- Administrative Procedure and Texas Register Act (APTRA)
- The statute setting out procedures to be followed by state agencies
for rulemaking and contested cases.
- Charging scrubber oil/skim hydrocarbons recovered by the plant/salt
water disposal system operator and charged back to the producing properties
connected to the plant/salt water disposal system.
- Amount of oil or gas which a well, leasehold or field may product
per month under proration orders of the RRC.
- The abbreviation for the American Petroleum Institute.
- API Gravity
- Specific gravity measured in degrees on the American Petroleum Institute
scale. Ratio between equal volumes of liquid hydrocarbons (condensate)
- API Number
- This is a unique, permanent, numeric identifier assigned for identification
purposes to a wellbore. It consists of 10 digits, the fIrst 2 digits
are the state code, the next 3 digits are the county code, and the
last 5 digits are the unique number assigned to identify the wellbore.
- Application for Future Re-Entry of Inactive Well Bore and 14(b)(2)
Extension Permit (Form W-1X)
- Statewide Rule 14 requires that any dry or inactive well be plugged
within one year after drilling or operations cease. An Unbonded Operator
may apply for an extension to this deadline by filing Form W-1X, $300
filing fee, and evidence of H-15 testing showing that the well is not
a threat of pollution. Additionally, if the well has been inactive
for 36 months or longer, then the W-1X filing must be accompanied by
an Individual Well Bond or Individual Well Letter of Credit covering
the estimated plugging cost of that specific well (calculated at $3.00
per foot of total well depth). Bonded operators are automatically considered
for 14(b)(2) extensions without the filing of a W-1X or well bond.
- Associated Reservoir
- Oil and gas reservoir with a gas cap. Gas production from these reservoirs
is generally restricted in order to preserve the gas cap energy thereby
increasing ultimate recovery.
- Abbreviation for barrel. In the energy industry, a barrel is 42
U.S. gallons measured at 60 ° Fahrenheit.
- The abbreviation for billion cubic feet of gas. (see "cubic foot
- The abbreviation for billion cubic feet of gas per day.
- The abbreviation for bottom-hole pressure.
- Basic Electric Log
- Any wireline survey run for the purpose of obtaining lithology, porosity,
or resistivity information.
- Basic Sediment & Water (BS&W)
- Impurities and water contained in the fluid produced by an oil well.
- Bay Well
- (SWR 14) Any well under the jurisdiction of the Commission for which
the surface location is either:
(a) located in or on a lake, river, stream, canal, estuary, bayou, or other
inland navigable waters of the state; or
(b) located on state lands seaward of the mean high tide line of the Gulf of
Mexico in water of a depth at mean tide of not more than 100 feet that is sheltered
from the direct action of the open seas of the Gulf of Mexico.
- Blanket Performance Bond (Form P-5PB(2))
- Commission approved form used by organizations filing a bond as their
Financial Assurance under Financial Assurance Option 2 above.
- Blind Nipple
- Nipple (pipe with threads at both ends) that can be blocked off from
formation pressure and give a false valve pressure measurement.
- The number or letter used in description of a group of surveys identified
as a _block_ on the Texas General Land Office county patent survey
maps (Example: 101 or A). A block is a defined set of original land
surveys. A block has an identifying name and/or number, and surveys
within it are usually consecutively numbered sections. Land grants
from the State of Texas to railroad companies were often patented in
blocks and sections. The term block is also used as a unit of a subdivision,
- Blowout Prevention
- Casinghead equipment that prevents the uncontrolled flow of oil, gas
and mud from the well by closing around the drillpipe or sealing the
- Bonded Operator
- An organization that files financial assurance with their organization
report under Financial Assurance Option 1 or Option 2. (See Financial
- The abbreviation for barrels of oil per day.
- Bradenhead Completion
- A head, screwed into the top of the casing, used to confine gas in
the well until release through an outlet into a pipeline.
- Bridge Plug
- A downhole tool (composed primarily of slips, a plug mandrel, and
a rubber sealing element) that is run and set in casing to isolate
a lower casing interval while testing an upper section.
- Brine Well
- Well that produces brine for heavy mud production.
- Abbreviation for British Thermal Unit(s). The amount
of heat required to raise the temperature of one pound of water one
degree Fahrenheit under standard conditions of pressure and temperature.
- Cable Tool Drill
- Drilling that operates on a combination hammer suction principle.
- Descriptive of wellbore in which steel pipe, called casing, is run
- Pipe cemented in the well to seal off formation fluids or keep the
hole from caving in.
- Casing Tubing Annulus
- Space between the surface casing and the production casing.
- Casinghead Gas
- Gas found naturally in oil and produced with the oil.
- A device that is secured around the casing in the hole and provides
a uniform cement sheath around the pipe. Centralizers are run along
the string of casing at various intervals.
- Christmas Tree
- The system of pipes, valves, gauges and related equipment that is
located on the well at ground level and that controls the flow of gas
and other petroleum products produced from the well.
- Circulating Oil
- see Frac Oil
- Commenced Date
- The date the well is spudded.
- The Railroad Commission of Texas.
- Common Reservoir
- A pool or accumulation of oil or gas that is produced in more than
- Communication between reservoirs
- see Packer Leakage Test
- Completion Date
- (A) The date the well is capable of producing by turning a valve or
flipping a switch.
(B) for a gas well, the date the well is capable of producing (into the sales
line if available).
- Completion Date (Back of G-1/W-2)
- The date the well bore has been drilled to total depth and:
(b) cased and cemented, or
(c) workover operations are completed.
- Completion Depth
- The approximate depth of completion for each field listed on the permit.
This depth must be less than or equal to the total depth; it cannot
be deeper than the Total Depth.
- Any liquid hydrocarbon recovered by surface separators from natural
- Two or more tracts of land that are touching at any point, regardless
of the size of contact.
- The county of the surface well site. If a proposed bottomhole location
is in another county, the bottom hole county must also be listed on
- Crude Oil
- Liquid petroleum as it comes out of the ground as distinguished from
refined oils manufactured out of it.
- Cubic Foot of Gas
- As a unit of volume, 1,728 cubic inches. As applied to water, 7.48gallons.
As applied to natural gas, the volume of gas which,
when saturated with water vapor at 60ºF and at a pressure of
30 inches of mercury occupies one foot.
- Daily MCF Gas
- Gas measured in final 24 hours of test in units of a thousand cubic feet.
Volume of gas that the well is capable of producing into the sales line in
a 24-hour period under normal operating conditions.
- Development Well
A well drilled to a known producing formation in a previously discovered field.
Farthest distance between two points on a proration unit.
The intentional deviation of a wellbore from vertical. Although wellbores are
normally planned to be drilled vertically, many occasions arise when it is
necessary or advantageous to drill at an angle from the vertical.
- Directional Survey
A survey run by a survey company to measure the deviation at a given depth
and the direction of the deviation (to locate bottom of wellbore).
- Discovery Date
Date assigned to discovery of a new field.
- Discovery Well
The first oil or gas well drilled in a new field. The discovery well is the
well that is drilled to reveal the actual presence of a petroleum-bearing
reservoir, Subsequent wells are development wells.
- Disposal Well
- Well used for disposal of saltwater into an underground formation.
- The method of accounting for oil or gas production removed from the
lease or adjusted production figures to reflect actual stock on hand.
- Dissolved Gas
- Commonly referred to as solution gas. (Refer to solution gas)
- Distance From Proposed Location To Nearest Lease or Unit Line
- Distance (in feet) from the proposed location to the nearest point
on the lease line or pooled unit line. If there is an unleased interest
in a tract of the pooled unit that is nearer than the pooled unit line,
the nearest point on that unleased tract boundary is used.
- District Office
- The Commission designated office for the geographic area in which
the property or act subject to regulation is located or arises.
- This term is used in describing operations performed after those at
- In the Production Query application, the results data contains links
that when clicked, become another filter in the search criteria.
- Dry Gas
- Natural gas that does not have a significant content of liquid hydrocarbons
or water vapor.
- Dry Hole
- Any well that fails to discover oil or gas in commercial quantities.
- ECAP (Electronic Compliance and
- An internet based permitting system developed by the
Railroad Commission in partnership with the U.S. Department
of Energy and the Oil and Gas Industry.
- Electric Logs
- Recording that indicates the well's rock formation
characteristics by different responses to electric current.
- Enhanced Oil Recovery (EOR)
- The use of any process for the displacement of oil
from the reservoir other than primary recovery.
- A colorless odorless gaseous hydrocarbon with the
characteristics of the predominant molecule, CH3CH3.
- Exploratory Well
- Any well drilled for the purpose of securing geological
or geophysical information to be used in the exploration
or development of oil, gas, geothermal, or other mineral
resources, except coal and uranium, and includes what
is commonly referred to in the industry as "slim
hole tests," "core hole tests," or "seismic
- Extraction Loss
- The reduction in volume and energy content of natural
gas resulting from the removal of natural gas liquid
- Assignment or partial assignment of an oil and
gas lease from one lessee to another lessee.
- Area of oil and gas production with at least one
common reservoir for the entire area.
- Field Name
- A name assigned by the Commission too a geographical
area in which a number of oil or gas wells produce
from one or more continuous reservoir. The term generally
refers to the surface area but also incorporates surface
and the underground productive formations. In a single
field there may be several separate reservoirs at
- Field Rules
- Spacing and production rules for the common reservoir
in an area.
- Financial Assurance Option 1
- An Individual Performance Bond, Letter of Credit
or Cash Deposit filed in conjunction with an annual
Organization Report (Form P-5). The amount of the
Bond or Letter of Credit is calculated by multiplying
the total depth of all wells operated by the company
times $2.00 per foot. This option is not available
to new organizations, nor to organizations who are
engaged in any activities other than producing oil
and gas wells.
- Financial Assurance Option 2
- A Blanket Performance Bond, Letter of Credit or
Cash Deposit filed in conjunction with an annual Organization
Report (Form P-5). The amount of the Bond or letter
of Credit is determined by the total number of wells
an organization has: 0 - 10 wells, $25,000; 11-99
wells, $50,000; 100 or more wells, $250,000. This
option is available to all operators.
- Financial Assurance Option 3
- A fee of $1,000 filed in lieu of a bond or letter
of credit in conjunction with an annual Organization
Report (Form P-5). This option is only available to
organizations who are able to show 48 months of an
acceptable record of compliance with Commission rules,
and is not available to new organizations except under
certain limited circumstances (such as business reorganization
and name changes). This option is only available if
the Commission determines that bonds under Option
1 or 2 are not available at reasonable prices.
- Financial Assurance Option 4
- A fee of 12.5% of the bond amount that would otherwise
be required under Financial Assurance Option 1 or
Option 2 (whichever is less), filed in lieu of a bond
or letter of credit in conjunction with an annual
Organization Report (Form P-5). This option is available
to all operators.
- The burning of gas in the field as a means of disposal
when there is no market for the gas and the operator
does not elect (or cannot) use the gas for a non-wasteful
purpose. Flaring of gas is regulated.
- A separate layer of rock or group of intermingled
- High pressure or explosive method of fracturing
- Frac Oil
- Any oil or liquid hydrocarbon used in fracturing
a formation to stimulate a well, as distinguished
from the oil that is normally produced by the well.
- Fuel and Shrinkage
- The difference between the amount of gas produced
at the wellhead and the gas that enters a pipeline
that can be associated with providing energy to on
lease equipment or removal of solution gas. The losses
include but are not limited to those from the separation
process and field use, as well as fuel, flare gas
and plant liquids extraction.
- Fullwell Stream (Wet gas)
- Combined production of gas and condensate before
the condensate has been separated from the gas.
- G-10 Test
- Well status report filed at operator's discretion
or in response to a specific Commission request
- see Natural Gas
- Gas Formation Production
- The volume of gas produced from a formation measured
in MCF, regardless of disposition, including test
gas and/or flared gas. (Does not include gas lift
gas if gas lifting.)
- Gas Lift
- The process of raising or lifting fluid from a
well by means of gas injected down the well through
tubing or tubing casing annulus. Injected gas aerates
the fluid to make it exert less pressure than the
formation pressure, consequently forcing the fluid
out of the wellbore.
- Gas Well
- Any well:
(a) which produces natural gas not associated or blended with crude petroleum
oil at the time of production;
(b) which produces more than 100,000 cubic feet of natural gas to each barrel
of crude petroleum oil from the same producing horizon; or
(c) which produces natural gas from a formation or producing horizon productive
of gas only encountered in a wellbore through which crude petroleum oil also
is produced through the inside of another string of casing or tubing. A well
which produces hydrocarbon liquids, a part of which is formed by a condensation
from a gas phase and a part of which is crude petroleum oil, shall be classified
as a gas well unless there is produced one barrel or more of crude petroleum
oil per 100,000 cubic feet of natural gas; and that the term "crude
petroleum oil" shall not be construed to mean any liquid hydrocarbon
mixture or portion thereof which is not in the liquid phase in the reservoir,
removed from the reservoir in such liquid phase, and obtained at the surface
- Includes any pipeline, truck, motor vehicle, boat,
barge, or person authorized to gather or accept oil,
gas, or geothermal resources from lease production
or lease storage.
- Gathering Line
- A pipeline that transports gas from the point of
production to a transmission line or main.
- Geological Marker
- Specified geological signature indicating a named
- Geothermal Energy and Associated Resources
- (A) All products of geothermal processes, embracing
indigenous steam, hot water and hot brines, and geopressured
(B) Steam and other gases, hot water and hot brines resulting from water,
gas, or other fluids artificially introduced into geothermal formations;
(C) Heat or other associated energy found in geothermal formations;
(D) Any by product derived from them.
- Geothermal Resource Well
- A well drilled within the established limits of
a designated geothermal field.
(a) A geopressured geothermal well must be completed within a geopressured
(b) A geopressured aquifer is a water-bearing zone with a pressure gradient
in excess of 0.5 pounds per square inch per foot and a temperature gradient
in excess of 1.6o F per 100 feet of depth.
- The abbreviation for gas-oil ratio. This is calculated
using the formula, cubic feet of gas divided by barrel
of oil produced.
- Abbreviation Hydrogen Sulfide; see Hydrogen Sulfide
- Horizontal Drilling
- Drilling which is not vertical.
- An organic chemical compound of hydrogen and carbon,
called petroleum. The molecular structure of hydrocarbon
compounds varies from the simplet, methane (CH4),
a constituent of natural gas, to the very heavy and
very complex. Octane, for example, a constituent of
crude oil, is one of the heavier, more complex molecules.
- Hydrogen Sulfide Gas
- Sour smelling natural gas with a high percentage
hydrogen sulfur content.
- Identifiable Slug of Liquid Hydrocarbons
- Volume of liquid hydrocarbons that is received
at the disposal facility where the origin of such
liquid hydrocarbons can be clearly identified.
- Inclination Survey
- A survey that measures the angle of the deviation
of the well from the vertical.
- Independent Producer
- An energy company, usually in the exploration and
production segment of the industry and generally,
with no marketing, transportation or refining operations.
A non-integrated producing company in the oil industry.
- Individual Performance Bond (Form P-5PB(1))
- Commission approved form used by organizations
filing a bond as their Financial Assurance under Financial
Assurance Option 1. See Financial Assurance Option
- Individual Well Bond (Form P-5IWB)
- Commission approved form used by Unbonded Operators
filing a bond for an inactive well in connection with
a Form W-1X (where required).
- Individual Well Irrevocable Documentary Letter of
Credit (Form P-5IWLC)
- Commission approved form used by Unbonded Operators
filing a letter of credit for an inactive well in
connection with a Form W-1X (where required).
- Injection Well
- Well used to inject fluids (usually water) into
a subsurface formation by pressure.
- Intermediate Casing
- The string of casing set in a well after the surface
casing The casing is sometimes called protective casing.
- Irrevocable Documentary Blanket Letter of Credit
- Commission approved form used by organizations
filing a letter of credit as their Financial Assurance
under Financial Assurance Option 1 or Option 2 above.
- Kelly bushing
- Drilling rig equipment that fits inside the rotary
table and is also used as a reference point on logs
to calculate depth.
- (A) The tract of land included in the proration
units of a well(s).
(B) A legal document executed between landowner or lessor that grants the
right to exploit the premises for minerals or other products.
- Lease and Fluid Fuel System Disposition
- The volume of gas which is used, sold, or given
to others for field operations. lease drilling fuel,
compressor fuel, etc.
- Lease Condensate
- see Condensate
- Lease Name
- Name that describes specific total lease/pooled
unit/unitized acreage established for RRC regulatory
purposes such as obtaining drilling permits and filing
completion reports. All contiguous lease/pooled unit/unitized
acreage must be identified with the exact same lease
name. Lease names may contain up to 32 characters.
Preferred formatting is for last names to be listed
first, for example: Smith, John rather than John Smith.
- Liquid Hydrocarbons
- Chemical combinations of varying hydrogen and carbon
ratio such as are mixed in and compose crude oil.
- Load Oil (Also called frac oil, work oil, or circulating
- see Frac Oil
- Location Plat
- Plat which shows the location of all leases involved
in the commingling application. The plat should show
the approximate location of LA.C.T. units, meters,
tank batteries, and any other separation, metering,
or storage facilities involved in the application.
- A systematic recording of data used to ascertain
downhole information about a well.
- Long String
- Last string of casing set in the well, covering
the productive zone.
- Low Temperature Extraction (LTX) Unit
- Condensation of gas into a liquid by refrigeration.
- One thousand cubic feet of natural gas measured
at standard pressure and temperature conditions (see "cubic
foot of gas"). The term is commonly used to express
the volume of gas produced, transmitted or consumed.
- Metering and/or Flow Diagram
- A diagram which shows all meters, separators, and
other production equipment. The purpose of the diagram
is to show where production from each well is separated,
metered, and/ or commingled.
- Million barrels of oil.
- One million British thermal units, 252,000 Kilocalories
or 293 Kilowatt Hours.
- One million cubic feet.
- Drilling fluid used to lubricate the drill string,
line, the walls of the well, flush cutting to the
surface and create enough weight to prevent blowouts.
- Multiple 49(b)
- Rule governing gas well production from an oil
reservoir gas cap.
- Multiple Completion
- The completion of a single well into more than
one producing horizon. Such a well may produce simultaneously
from the different horizons, or alternatively from
- Natural Gas
- A naturally occurring mixture of hydrocarbon and
non-hydrocarbon gases in porous formations beneath
the earth's surface, often in association with petroleum.
The principal constituent is methane.
- Natural Gasoline
- Gasoline manufactured from casinghead gas or from
any natural gas.
- Nearest Well Distance
- Distance to the nearest oil or gas well applied
for, permitted, or completed on a lease in the same
field and reservoir.
- Net Oil
- The amount of oil produced by a lease exclusive
of its BS&W content.
- NGL, Natural Gas Liquids
- Hydrocarbon liquids extracted from natural gas.
- Any malodorous substance added to natural or LP
gas in small concentrations for the purpose of making
the presence of the gas detectable.
- Wells that are in the Gulf of Mexico, between barrier
islands and the three-league line.
- Offshore Well
- Any well subject to Commission jurisdiction for
which the surface location is on state lands in or
on the Gulf of Mexico, that is not a bay well. (see
- Oil Well
- Any well which produces one barrel or more crude
petroleum oil to each 100,000 cubic feet of natural
- On Hand, Beginning of Month
- The closing stock on hand from the previous month's
- On Hand, End of Month
- The balance arrived at when the "On hand,
beginning of month" figure is added to the current
month production and then the disposition volume(s)
for the month is subtracted.
- Open flow Test
- A test made to determine the volume of gas that
will flow from a well during a given time span with
- A person, acting for himself or as an agent for
others and designated to the Commission as the one
who has the primary responsibility for complying with
its rules and regulations in any and all acts subject
to the jurisdiction of the Commission.
- Operator of Record
- The operator of the lease, according to Commission
records, that is responsible for compliance with all
commission rules and regulations.
- Organization Report (Form P-5)
- Annual filing required under Statewide Rule 1.
A six-digit number is assigned to an organization
name by the RRC with the initial filling of the form
P5. The P-5 number is synonymous with a gatherer and
operator number. An organization report contains information
about the organization including the name, street
address and mailing address of the organization, the
plan of the business organization, and officers, partners
or owner information.
- Production in excess of the lease or well's monthly
- P-5 Filing Fee
- An annual fee between $100 and $1,000 remitted
in connection with the filing of a new or annual renewal
Organization Report. Note: this fee is separate and
apart from any fees submitted as a form of financial
assurance under Option 3 or Option 4. This fee is
required of all operators and is based upon the operations
conducted under that operator's name according to
the schedule set out in Statewide Rule 78.
- Packer Leakage Test
- Pressure test conducted to demonstrate that there
is no communication between the zones. Instructions
for conducting this test are on the back of Form W-6
- Packer/Tubing Completion
- Multiple completion involving one or more strings
of tubing. One or more packers are used to prevent
communication between zones.
- The shooting of holes in casing and cement to allow
formation fluids to enter the well bore.
- Ability of rock to transmit fluids through pore
- Any natural person, corporation, association, partnership,
receiver, trustee, guardian, executor, administrator,
and a fiduciary or representative of any kind.
- Hole dug out of the surface for temporary storage
of fluids during drilling operations.
- (A) Any object or device that serves to block a
hole or passageway (as a cement plug in a borehole).
(B) Seal off formations to stop open communication of formation fluids within
- Plug and Abandon (P&A)
- To place a cement plug or plugs in a wellbore and/or
capping the well with a metal plate during abandonment.
- To cement off lower section of casing; to block
liquids from rising in casing to a higher section
- Unauthorized contamination of surface or subsurface
water or land.
- Pooled Unit
- Unit created by combining separate mineral interests
under the pooling clause of lease or agreement.
- Percentage of the rock volume that can be occupied
by oil, gas or water.
- Amount of oil a well is capable of producing within
a specified 24-hour period.
- Parts per million.
- Processing Plant
- A plant to remove liquifiable hydrocarbons from
wet gas or casinghead gas.
- The person or company, whether proprietor or lessee,
actually operating the oil well or lease. See Operator.
- Producing Property
- A producing oil lease or gas well assigned an identification
number by the Commission and which is used in reporting
- Includes refined crude oil, crude tops, topped
crude, processed crude petroleum, residue from crude
petroleum, cracking stock, uncracked fuel oil, fuel
oil, treated crude oil, residuum, casinghead gasoline,
natural gas gasoline, gas oil, naphtha, distillate,
gasoline, kerosene, benzine, wash oil, waste oil,
blended gasoline, lubricating oil, blends or mixtures
of petroleum and/or any and all liquid products or
by products derived from crude petroleum oil or gas,
whether hereinabove enumerated or not.
- Production Casing
- Last string of casing or liner set in a well and
inside which is usually suspended in the tubing string.
- A gaseous hydrocarbon with the characteristics
of the predominant molecule CH3CH2CH3.
- Proration Unit
- Acreage allocated to a well for the purpose of
determining an allowable.
- PSI (pounds per square inch)
- An English system of measure of the amount of pressure
on an area that is 1 inch square.
- Pounds of pressure per square inch absolute, using
absolute zero as a base.
- Pounds of pressure per square inch guage, using
atmospheric pressure as a base.
- Purpose Of Filing
- The reason the drilling permit application is being
filed. (i.e. new drill, recompletion, reentry, reclass,
field transfer or amended permit.)
- One quadrillion (1,000,000,000,000,000) British
Thermal Units (BTU)
- Rat Hole
- Hole adjacent to well bore for storage of the kelly
joint when not in use.
- Reclamation Plant
- Plant that treats and reclaims waste oil.
- Regular Permit
- As applies to a W-1, Application to Drill.Permit
to drill, plug back or deepen that does not require
- Reserve Pit
- Pit used to collect spent drilling fluids, cutting
and wash water.
- A porous, permeable sedimentary rock containing
commercial quantities of oil and gas.
- Resident Agent
- For RRC purposes, this is an entity, whether an
individual or an organization, upon whom may be served
any process, notice or demand required or permitted
by law to be served.
- Residue Gas
- Gas remaining after processing for the extraction
- Rotary Drill
- The now prevalent method of drilling oil wells
, replacing cable tool drilling (q.v.) In essence,
the principle of rotary drilling is the rotation of
drill pipe, fastened to the bottom of which is a bit
(or cutting tool), usually of the roller bit design.
- RRC Identification Number
- The 6-digit identification number assigned by the
Railroad Commission to each gas well.
- Sales Line
- Transport line used by 1st purchaser.
- Salt Water Disposal Well (SWD)
- A well used for the purpose of injecting produced
water back into the ground.
- Scrubber Oil
- (A) Oil accumulated in the operation of casinghead
natural gasoline plants. Sale of such oil is regulated
in Texas under Rule 56 of the Statewide Rules of the
Texas Railroad Commission.
(B) Liquid hydrocarbons which are accumulated prior to compression of the
gas in lines gathering casinghead gas to a gas processing plant.
- Secondary Recovery
- Hydrocarbons produced in one well bore by increasing
reservoir pressure with water in another well bore.
- The number that further describes an abstracted
surveyed parcel or a surveyed parcel further divided
into numbered abstracted areas. A section typically
refers to a square land survey measuring exactly one
mile on each side. Some land transferred from the
public domain by the state of Texas was surveyed and
patented in units of square miles. The Texas General
Land Office officially considers these units sections.
Also, it was common that larger land grants, such
as school lands and capitol lands, were subsequently
surveyed into square mile units for the convenience
of sale; these surveys are also called sections. In
addition, the term "section" is commonly
used to describe surveys in a group that have been
assigned consecutive survey numbers, even though some
of them do not have the proper shape or size to truly
- Service Well
- Any well used in conjunction with the production
of hydrocarbons but not the actual producing well.
(i.e., disposal, injection, or brine production)
- To drill around broken drill pipe or casing that
has become permanently lodged in the hole .
- Stabilized shut-in well head pressure.
- Skim Hydrocarbons
- Oil and condensate accumulations that result from
salt water disposal skimming operations.
- Skim Oil/Condensate
- Oil or condensate recovered from a salt water gathering
system prior to injection or other disposal of the
water. In Texas a monthly skim oil report (Form P-18)
is required to be filed by salt water gathering systems
with the RRC reporting the quantities and disposition
of oil/condensate skimmed from water during the month.
- Solution Gas
- Gas which is dissolved in oil in the reservoir
- Sour Gas
- See Hydrogen Sulfide Gas
- Sour Gas
- (SWR 79) Any natural gas containing more than 11/2
grains of hydrogen sulfide per 100 cubic feet or more
than 30 grains of total sulfur per 100 cubic feet,
or gas which in its natural state is found by the
Commission to be unfit for use in generating light
or fuel for domestic purposes.
- Spot Market
- Short term, non-regulated, arms length contract
sales of natural gas, crude oil, refined products,
or liquid petroleum gas.
- Spud Date
- Date that drilling begins.
- State ID Number
- In Texas, this is a number for identification purposes
issued by the Department of Public Safety to persons
who do not drive. This is an eight-digit number.
- Storage Gas
- A gas that is stored in an underground reservoir.(see
underground hydrocarbon storage)
- Storage Tank
- Tank for the accumulation of oil pending transferal
to a pipeline company or other purchaser.
- Stratigraphic Cross Section
- Series of electric logs that illustrate formation
correlation with one formation as a datum.
- Structural Cross Section
- Series of electric logs that illustrate subsurface
structure by placing the logs relative to sea level.
- Substandard Acreage
- Amount of acreage that is smaller than the standard
proration unit for a field.
- Supplemental Officer Listing (Form P-5S)
- Statewide Rule 1 requires entities in control of
an organization to be shown on the annual Organization
Report filing. If the organization has more officers
than the three that will fit on Form P-5, the organization
will attach Form(s) P-5S showing the additional officers.
- Surface Casing
- Outer casing cemented in the top of the wellbore
that protects fresh water formations from contamination.
- Annual or semi-annual filing of well status report
that is initiated by the Commission (computer generated
on 81/2 x 11 size with green print) and mailed to
operators of wells. Operators are required to test
their wells and report well status to the Commission
on the survey
- Survey Name
- The name of the original grantee or the name of
the company, individual or eleemosynary institution
that is common among a formed group of surveys as
shown on the Texas General Land Office (GLO) county
patent survey map or the GLO State Abstract of Land
Titles. A survey is a certified measured description
of a piece of land. The term sometimes refers to the
land itself. In Texas, original surveys were performed
as part of the patenting process whereby land was
transferred from the public domain. These "patent
surveys," recorded at the Texas General Land
Office, constitute an official land grid for the State
and are the basis for subsequent land surveys.
- Survey/Section Lines
- Perpendicular distance (in feet) from one of the
two nearest non-parallel survey/section lines to the
proposed location. A description of the survey/section
line used to calculate the perpendicular distance.
- Sweet Gas
- All natural gas except sour gas and casinghead
- Tank Battery
- Tanks for oil storage before delivery to a refinery.
- Test Oil
- Amount of oil produced as a result of completing
a well. (Oil is produced against a future allowable.)
- Test on an Inactive Well More than 25 Years Old
- The operator of any well inactive more than 12
months must show that the well is not a threat of
pollution before any extension under Statewide Rule
14 can be granted. This is normally accomplished by
conducting a successful fluid level or mechanical
integrity test and reporting the results according
to the directions on Form H-15. This testing is required
with all W-1X filings and for any wellbores which
are 25 years old or older.
- Texas Offshore
- This term embraces the area in the Gulf of Mexico
seaward of the coast line of Texas comprised of:
(A) The three league area confirmed to the State of Texas by the Submerged
Land Act (43 United States Code §§1301-1315); and
(B) The area seaward of such three league area owned by the United States.
- A unit of heat equivalent to 100,000 British Thermal
- Tidal Disposal
- Discharge of produced water or other waste materials
into tide influenced waters.
- The amount of scrubber oil/skim hydrocarbons that
may be recovered before the plant/ salt water disposal
system operator must allocate to the producing property.
- Tolerance Acreage
- Small amounts of acreage assigned to a proration
unit after the unit is already established.
- Total Acres
- Number of contiguous acreage in lease. If pooled,
this should be total acreage in pooled lease.
- Total Depth
- The maximum depth reached in a well or depth that
will be drilled. This is the true vertical depth,
not the measured depth. For recompletion permits where
the well is being plugged back, the depth where the
cast iron bridge plug is set should be indicated as
- Transmission Line
- Pipelines used to transmit natural gas or other
- Transportation or to Transport
- The movement of any crude petroleum oil or products
of crude petroleum oil or the products of either from
any receptacle in which any such crude petroleum or
products of crude petroleum oil or the products of
either has been stored to any other receptacle by
any means or method whatsoever, including the movement
by any pipeline, railway, truck, motor vehicle, barge,
boat, or railway tank car. It is the purpose of this
definition to include the movement or transportation
of crude petroleum oil and products of crude petroleum
oil and the products of either by any means whatsoever
from any receptacle containing the same to any other
receptacle anywhere within or from the State of Texas,
regardless of whether or not possession or control
or ownership change. (See gatherer in general terms
section and transmission line in section pertaining
to oil and gas well production reporting)
- The person or company actually moving crude oil
or gas well liquid from the lease.
- Transporter or transporting agency
- Includes any common carrier by pipeline, railway,
truck, motor vehicle, boat, or barge, and/or any person
transporting oil or a product by pipeline, railway,
truck, motor vehicle, boat, or barge.
- String of pipe set inside the well casing, through
which the oil is produced.
- Tubingless Completion
- Two or more strings of tubing or production casing
cemented in the hole. The cement between the strings
of pipe prevents communication between zones.
- Unbonded Operator
- An organization who files financial assurance with
their organization report under Financial Assurance
Option 3 or Option 4. (See Financial Assurance Options)
- Underground Hydrocarbon Storage
- The use of sub-surface geologic formations for
storing liquid, liquefied or gaseous hydrocarbons,
such as natural gasoline, propane and natural gas.
- Production that is less than the allowable assigned
to a proration unit.
- Joint operations to maximize recovery among separate
operators within a common reservoir.
- Unitization Tract
- Land subject to a unitization agreement.
- Vertical Wellbore
- A wellbore drilled as nearly vertical as possible
by normal, prudent, practical drilling operations
under a permit indicating a surface location only
and without intentional deviation from the vertical
in accordance with the provisions of Statewide Rule
11 (a) and (b).
- Injecting water in one well causing oil not recovered
by primary production to migrate another well.
- Well Number
- A numeric or alpha numeric designation for a well.
The Commission uses a very specific 6 digit well number
format; A/N_N_N_N_A_A. All well numbers are right
justified to the fourth position so that well number
1 really reads as _ _ _ 1 _ _.
* All well numbers must contain at least one numeric character.
* Well numbers cannot contain any characters other than numbers and letters
no punctuation marks such as a dash (-).
* The last 2 places can only contain letters; these are generally used to
designate injection/disposal wells (1W, 1 W, 2SW), or multi-completions (1
U, 2 L, 3 C).
* The Commission will automatically right justify numeric only well numbers
to the correct position.
- Well Separation Extraction Loss
- Gas equivalent volume of the condensate production
calculated by laboratory or determined by using a
value of 1.1 MCF per barrel.
- Well Spacing Pattern
- Railroad Commission approved and administered well
spacing rules for a field which determine the proximity
that well can be drilled to one another in order to
conserve resources and protect correlative rights.
- Well Type
- Type of activity the well is anticipated to perform.
* Oil (either the field is only classified as an oil field or only the oil
spacing and density rules will be met)
* Gas (either the field is only classified as a gas field or only the gas
spacing and density rules will be met)
* Oil or Gas (both oil and gas spacing and density rules must be met)
* Injection (water/salt water/gas/steam injection, disposal)
* Storage (LPG, gas, underground)
* Service (testing tools, slim hole test, monitor, demonstration, observation,
* Water supply
* Catholic protection
* Exploratory test (core, stratigraphic, seismic, sulfur, uranium)
- Wellbore Profile
- This term is used only for W-1's filed through
the ECAP system to indicate if the wellbore is planned
to be vertical, sidetrack, directional sidetrack,
horizontal, or horizontal sidetrack.
- Wet Gas
- Natural gas containing liquid hydrocarbons in solution.
- Wildcat Well
- The popular name for an exploratory well.
- Work Oil
- see Frac Oil
- Interval of subsurface formation.