POSC Specifications
Version 2.2
| EXPRESS-I Examples of Instances
Well Information |
Well Information
Introduction
This section describes common information about wells and wellbores. These examples include the type of data that is found in typical "header" files, such as names, spud dates, statuses, lease and field names and operators. Also, surface and bottomhole locations are described.
Well Header Data
Well Name and Alias
PIDD Key P0002404, WELL NAME: The name assigned to a well, e.g., a special name or one derived from the name of the property with which the well is associated.
A well alias is any well name not used as the unique identifier (i.e., local well name, internal company name, alternate or retired API number, etc.).
Spud Date
PIDD Key P0002086, SPUD DATE: The day when the drilling bit penetrates the surface utilizing a drilling rig capable of drilling the well to the authorized depth.
Completion Date
PIDD Key P0002387, WELL COMPLETION_DATE:(1) Oil well or gas well: the date on which the installation of permanent equipment is completed (for the production of oil or gas) as reported to the appropriate agency. (2) Dry hole: the date of abandonment as reported to the appropriate regulatory agency (synonymous with Abandoned Date). (3) Service well: the date on which the well is equipped to perform the service for which it was intended.
Well Status
PIDD Key P0005876, WELL STATUS CODE:A code that represents the operational state of the well reported as a well activity for a time period. Well status requires associated date/time information.
Lease Name for a Well
PIDD Key P0001236, LEASE NAME: The name assigned to a lease by the regulatory agency having jurisdiction over mineral activity in the territory where the lease is located.
This example shows how to find the name of the lease in which a well is located. This uses an instance of topological relationship defined for spatial objects to say that the well is inside a lease that has a name.
Field Name for a Well
PIDD Key P0002632, FIELD NAME: Name of the field in which the well is located. This name may be company specific or regulatory.
This example shows how to find the name of the field in which a well is located. This uses an instance of a special transient association defined for wells to say that the well is inside a named portion of the Earth (which is not a spatial object but rather is represented by a spatial object).
Note: this structure is used for all the subtypes of EARTH_SURFACE_FEATURE, including GEOPOLITICAL_FEATURE (cities, states, provinces, countries, etc.), GEOGRAPHIC_FEATURES (forests, lakes, etc.), GEOLOGIC_PROVINCES, etc.
Well Operator
PIDD Key P0001575, OPERATOR: The individual, partnership, firm or corporation having control or management of operations for a facility or on the leased area or a portion thereof. The operator may be a lessee, designated agent of the lessees, or holder of operating rights under an approved operating agreement.
In this example, the Operator is shown in the context of an operator for a well.
Well Surface Location
PIDD Key P0002162, SURFACE LOCATION: The location of a well or facility/measurement point. This location is defined by the Minerals Management Service (MMS) in the MMS/PAAS Reporter Handbook. The location is defined by a two digit Location Method Code and a location description. This enables reporters to select the appropriate method (e.g., Lat-Long; Quarter-Quarter Section-Township-Range-Meridian; Metes and Bounds; Lambert Coordinates) to identify the location of their wells, facilities and meters. The location method code identifies which method was used by the reporter to define the location of the entity.
Surface Location: Latitude-Longitude
This example describes the surface location of a well expressed as a latitude - longitude coordinate pair for a standard geographic coordinate system. The coordinate system used is one of the standard "NAD 1927" or the "North American Datum 1927" geographic coordinate system. Other geodetic datums may be referenced by substituting the appropriate geographic coordinate system.
Surface Location: Northing-Easting
This example describes the surface location of a well expressed as a northing -easting coordinate pair for a standard projected coordinate system. In this example, the standard reference instance of the "NAD27 / Texas North Cen." projected coordinate system is used.
Well Elevation
PIDD Key P0004028, WELL ELEVATION: The distance above a specified reference datum, commonly the surface of the earth or mean sea level. A positive value denotes a point higher than the reference point.
When the location is given without specifying a "coordinate_reference" vertex, the origin of the measurement is defined by the coordinate system used. In this example, the coordinate system specifies that the elevation is referenced to mean sea level. This coordinate system is defined in the Coordinate Systems section of the examples.
Well Bottomhole Location
PIDD Key P0005894, BOTTOMHOLE: Bottomhole is used to describe a position a long a wellbore path that is usually at or near a terminus of an open borehole. Bottomhole is also used to describe equipment used at these positions, or physical conditions or agreements related to these positions.
PIDD Key P0003012, BOTTOMHOLE LOCATION: The location of a wellbore bottomhole.
Bottomhole Measured Depth
PIDD Key P0001378, MEASURED DEPTH: Depth into a wellbore measured along a wellbore path from the wellbore path datum to a wellbore point. Commonly abbreviated as MD. All measured depth values are recorded relative to a wellbore path and its datum and basis.
In this example, the kelly bushing is used as the "coordinate_reference" point for measured depth of the bottomhole for a wellbore. Also, the coordinate system for elevation above mean sea level is defined in the section on Coordinate Systems.
Bottomhole True Vertical Depth
PIDD Key P0007112, WELL TOTAL TRUE VERTICAL DEPTH: The vertical, straight-line depth from the surface datum to the wellbore bottomhole. Often abbreviated as Well TVD.
A point representing the termination of the wellbore, beyond which no further drilling was performed. The point is measured in true vertical depth below the mean sea level datum. This coordinate system is defined in the section on Coordinate Systems.
Bottomhole Location: Latitude-Longitude
Position of the wellbore bottomhole with respect to the well surface location. This example uses a standard instance of a geographic coordinate system.
Bottomhole Location: Northing-Easting
Position of the wellbore bottomhole with respect to the well surface location. This example uses a standard instance of a projected coordinate system.
Wellbore Deviation Information
This example describes the geometry of a wellbore from the surface to bottomhole, but not the activity of conducting a deviation survey (also known as a directional survey). The wellbore deviation information is typically a set of measured depths, true vertical depths, north deviations and east deviations at a series of points from the top to the bottom of the wellbore. The measured depths, north deviations and east deviations are conventionally measured using the top of the wellbore as (0, 0, 0). although another reference point may be used (such as a standard platform reference point).
The well is first described as a directional well, which is a classification based upon intentions and measurable characteristics of the well. Secondly, the generic shape of the wellbore is described as a "build and hold" wellbore. Finally, the wellbore path, as derived from an interpretation using the tangential method, is given as:
| Measured Depth (ft)
| True Vertical Depth (m)
| North Deviation (m)
| East Deviation (m)
|
|---|
| 0
| -85.04
| 0
| 0
|
| 2500
| 656.59
| 155.24
| 12.04
|
| 5000
| 1427.35
| 340.48
| -24.57
|
| 7500
| 2307.02
| 916.83
| -69.17
|
| 9843
| 2687.42
| 1491.18
| -103.78
|
Copyright 1997 POSC. All rights reserved.