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The NPD's Fact-pages |
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| NPDID wellbore: | ID assign to the wellbore by the NPD. |
| Well name: | Official well name based on NPD guidelines for designation of wells and wellbores. |
| Drilling operator name: | Short-name, used by the NPD, of the drilling operator company. |
| Geodetic datum: | Reference system for coordinates. |
| Coordinates: | Geographical coordinates. |
| UTM coordinates: | Universal Transverse Merkator coordinates. |
| UTM zone: | Universal Transverse Merkator zone. |
| Drilled in production licence: | The official designation of the production licence. Consists of name and version. |
| Area: | NORTH SEA, NORWEGIAN SEA, BARENTS SEA. |
| Discovery: | Discovery the wellbore is drilled on. |
| Field: | Field the wellbore is drilled on. |
| Drill permit: | The drilling permit number together with the version of the drilling permit as stated in the drilling permit granted when permission for drilling was applied by the NPD. |
| Drilling facility: | The NPD's designation of the facility which the wellbore was drilled from. |
| Production facility: | For development wellbores, the NPD's designation of the production facility. |
| Operation days: | Number of days from wellbore entry to wellbore completion. |
| Pre-drill entry date: | In the pre-drilling phase, the date when the drill bit penetrates the earth crust/sea floor. |
| Pre-drill completion date: | In the pre-drilling phase, the date when the anchor handling starts. In case of jack-ups, the completion date is the date the jacking down starts. |
| Wellbore entry date: | The date when the drill bit penetrates the earth crust / sea floor. |
| Wellbore completion date: | The date when the anchor handling starts. In case of jack-ups, the completion date is the date the jacking down starts. |
| Re-entry activity: | Re-entry activity: PLUGGING, DRILLING, TESTING, LOGGING. |
| Multilateral wellbore: | Multilateral wellbore: YES or NO. A well that has more than one branch radiating from the main borehole. See also NPD guidelines for designation of wells and wellbores. |
| Original wellbore purpose: | Pre-drill purpose of the wellbore. |
| Wellbore purpose: | Post-drill classification of the wellbore. |
| Wellbore status: | Present wellbore status. P&A (plugged and abandoned), SUSPENDED, JUNKED, SUSP. REENTERED LATER, ... |
| Original wellbore contents: | For development wellbores, pre-drill expected type of produced/injected fluid: OIL, GAS, GAS/CONDENSATE, OIL/GAS, WATER, WATER/GAS, CUTTINGS, CO2. |
| Wellbore contents: | For exploration wellbores, status of discovery: DRY, SHOWS (trace amounts of hydrocarbons), GAS, GAS/CONDENSATE, OIL, OIL/GAS or OIL/GAS/CONDENSATE. SHOWS (GAS SHOWS, OIL SHOWS or OIL/GAS SHOWS) are detected as direct fluorescence, fluorescent "cut" (organic extract), petroleum odour, or visual stain on cuttings or cores, or as increased gas reading on the mud-loggers gas detection equipment. For development wellbores, type of produced/injected fluid: OIL, GAS, GAS/CONDENSATE, OIL/GAS, WATER, WATER/GAS, CUTTINGS, CO2. |
| Discovery wellbore: | Discovery wellbore: YES or NO. |
| Formation/age with hydrocarbons 1 (2, 3): | Name(s) (according to NPD bulletins) and age(s) (according to Geologic Time Scale 2004 by F.M. Gradstein, et al. (2004)) of lithostratigraphic unit(s) where hydrocarbons have been encountered. |
| Seismic location: | Position of well on seismic survey lines. SP: shotpoint. |
| Kelly bushing elevation (RKB) [m]: | Elevation of rotary kelly bushing above mean sea level. |
| Water depth [m]: | Water depth from mean sea level at well site. |
| Total Depth (TD) [m]: | Total measured length of well bore from kelly bushing to total depth (drillers depth). |
| Final vertical depth (TVD) [m]: | Final vertical elevation from total depth to kelly bushing. Often reffered to as true vertical depth (TVD). |
| Max inclination [°]: | Maximum deviation, in degrees, from a vertical well path. |
| Bottom hole temperature [°C]: | Estimated temperature at final total depth. Description. |
| Oldest penetrated age: | Age (according to Geologic Time Scale 2004 by F.M. Gradstein, et al. (2004)) of the oldest penetrated formation. May differ from age at total depth in deviated wells. |
| Oldest penetrated formation: | Name (according to NPD bulletins) of the oldest penetrated formation. May differ from formation at total depth. |
Short account of purpose, operations and results. Commonly used abbreviations.
A casing is a metal or plastic tubing set in the wellbore.
| Type: | A typical wellbore will be cased with CONDUCTOR and SURFACE CONDUCTOR types of casing in the upper section, INTERMEDIATE casing through non-reservoir sections, and a PRODUCTION or plastic LINER types of casing, or even OPEN HOLE, in potential reservoir sections towards final total depth of the wellbore. |
| Casing diam. [inch]: | Inner diameter of casing. |
| Depth below KB [m]: | Total depth of a cased section (casing shoe). |
| Hole diam. [inch]: | Diameter of wellbore (the drill bit). |
| Hole depth below KB [m]: | Total depth of a well section drilled with a certain diameter. |
| Lot mud eqv. [g/cm3]: | A leak-off test (LOT) measures the formation integrity by increasing the mud load to the point where the mud starts to leak into the formation. |
Formation fluid samples submitted from the operators according to NPD regulations.
| Test type: | Technology used to acquire the sample. |
| Bottle test number: | Test number as specified on the bottles submitted to the NPD. |
| Bottle interval [m]: | Test interval as specified on the bottles submitted to the NPD. |
| Fluid type: | Sampled fluid as specified on the bottles submitted to the NPD. |
| Test date and time: | Test date and time. |
Cuttings samples submitted from the operators according to NPD regulations.
| Interval [m]: | Sampled interval. |
Cores submitted from the operators according to NPD regulations.
| Core length [m]: | Sum of length of all cores in the well. |
| Core number: | Core number. |
| Interval: | Cored interval according to the labels on the core boxes submitted to the NPD core store. |
Palynological slides submitted from the operators according to NPD regulations.
| Sample depth: | Depth at which the sample was taken. |
| Depth unit: | Depth unit is meter (M) or feet (F). |
| Sample type: | Sample type is: DC: ditch cuttings C: core SWC: sidewall core |
| Laboratory: | Laboratory that prepared the sample: APT: Applied Petroleum Technology BIOST(RAT): Biostrat FUGRO: Fugro/Robertson GEOCH: Geochem GEOST(R): Geostrat HYDRO: Norsk Hydro IKU: Institutt for kontinentalsokkelundersøkelser LAP: Laboratory for applied palynology OD: Norwegian Petroleum Directorate PALEO/PAS: Paleoservices RRI: Robertson Research International SAGA: Saga Petroleum STATO: Statoil STRAT: Stratlab UOS: University of Sheffield WESTL.: West Lab |
The physical properties of the mud used to drill the bore hole. Commonly used abbreviations.
| Mud weight [g/cm3]: | The mud density. |
| Visc. [mPa.s]: | The mud viscosity. |
| Yield point [Pa]: | The resistance to initial flow, or represents the stress required to start fluid movement. |
| Mud type: | Mud type as reported in the Daily Drilling Report System (DDRS). |
| Date measured: | Date, during drilling operations, when mud properties are measured and logged. |
The basic drill stem test tool consists of packers, valve or ports that may be opened and closed from the surface, and two or more pressure-recording devices. The tool is lowered on the drill string to the zone to be tested. The packers are set to isolate the zone from the drilling fluid column. The valves or ports are then opened to allow for formation flow while the recorders chart static pressures. A sampling chamber traps clean formation fluids at the end of the test. A DST typically consists of several flow periods separated by shut-in periods where pressure is allowed to restore (buildup) towards static conditions. The first flow period is the cleanup period.The initial shut-in period is usually followed immediately by an extended period of flow. The well is then shut-in for the final or main buildup period. Data obtained during this period are analyzed to determine permeability and skin effect. Final flow periods commonly range from 4 to 24 hours, and final buildup periods from 6 to 48 hours.
| Test no.: | Usually assiciated with a specific test interval but may also represent tests under different conditions from the same interval. |
| Test interval [m]: | The zone that is opened up for flow. |
| Choke size [mm]: | The choke is a type of orifice installed in a well flow line for the purpose of restricting the flow and controlling the rate of production. During testing of a well the flow will often be measured through a series of different choke diameters. |
| Final shut-in pressure [MPa]: | Pressure as recorded at the wellhead when the valve is closed and the well is shut-in in the final buildup period. |
| Final flow pressure [MPa]: | The pressure determined at the formation face just prior to shut-in for a buildup test. |
| Bottom hole pressure [MPa]: | The downhole pressure opposite a formation of interest when the valves at the surface (or downhole) are completely closed. The pressure is transmitted by fluids which exist in a formation and are in communication with the well bore. |
| Downhole temperature [°C]: | The downhole temperature opposite a formation of interest, typically measured as the final or maximum temperaure in the main flow period. |
The basic drill stem test tool consists of packers, valve or ports that may be opened and closed from the surface, and two or more pressure-recording devices. The tool is lowered on the drill string to the zone to be tested. The packers are set to isolate the zone from the drilling fluid column. The valves or ports are then opened to allow for formation flow while the recorders chart static pressures. A sampling chamber traps clean formation fluids at the end of the test. A DST typically consists of several flow periods separated by shut-in periods where pressure is allowed to restore (buildup) towards static conditions. The first flow period is the cleanup period. The initial shut-in period is usually followed immediately by an extended period of flow. The well is then shut-in for the final or main buildup period. Data obtained during this period are analyzed to determine permeability and skin effect. Final flow periods commonly range from 4 to 24 hours, and final buildup periods from 6 to 48 hours.
| Test no.: | Usually assiciated with a specific test interval but may also represent tests under different conditions from the same interval. |
| Oil [Sm3/day]: | The rate of oil produced from the formation. |
| Gas [Sm3/day]: | The rate of gas produced from the formation. |
| Oil density [g/cm3]: | Oil density. |
| Gas grav. rel.air: | Gas gravity relative to air. Air gravity is by definition = 1.0. |
| GOR [m3/m3]: | Gas to oil ratio. |
Wireline and MWD logs that have been run in the well.
| Log type: | Assembly of log tools in a run. Abbreviations as reported from the companies. |
| Intervals logged [m]: | Intervals logged. |
NPD interpretations. May be subject to changes. Measured length along the wellbore from kelly bushing to start of lithostratigraphic unit. Always the formation which the bit goes into. Note that in some situations, for example highly deviated wells, faults, drilling beyond salt walls, this might not be a true stratigraphic top. The start of a unit will be its stratigraphic base when drilled from underneath. In case of intercalating formations several top depths may occur for the same formation designating the top depths of the sub-packages. For some intervals in some wells only groups are interpreted and no formation tops have been assigned. Members have been assigned only near the type well area.
Descriptions of the stratigraphic units kan be found on the fact-pages under the “Stratigraphic units” topic or in the NPD bulletins. "Informal" units represent units that are not yet described in any NPD bulletin or are represented by “No formal name”.
| Top depth [m]: | Measured depth to top of formation or group. |
| Lithostratigraphic unit: | According to official nomenclature in the
NPD bulletins. GP: Group FM: Formation MBR: Member |
A composite log for the wellbore compiled by the NPD.
Raw data from organic geochemical analyses of samples of fluids and rocks from the well (.pdf and .txt format).
Pdf-documents from selected scanned documents for wellbores more than 20 years old, for example Final well reports, Completion logs, reports on biostratigraphy.
Pdf-documents from old NPD WDSS reports and completion logs and other documents related to the wellbore. Interpretations presented in these documents may differ from updated interpretations shown on the fact page.
