POSC Specifications
Version 2.2 |
Summary of Changes |
Summary of Changes in v2.2
This document introduces the changes made to POSC Specifications during the creation of version 2.2. This file presents an overview of these changes. Detailed descriptions of these changes are available inside individual specifications.
The following sections present a summary of the changes in version 2.2. This summary is presented for the following areas:
Preferred Values
Simple preferred value:
- new boolean flag in property (supertype of all pty entities) "set to True if this instance of property is the preferred value in this data store of this type of property for the object which this property describes"
- any property of an object may be projected in the object's table
Complex preferred values
- ref data collection type = "preferred value"
What are the benefits?
- Simple tables for those with a relational point of view
- Easier and quicker access to those with a relational point of view
- Better fit with legacy data and applications
Class Aliases
New class alias entities
- material class alias
- equipment class alias
- facility class alias
- activity class alias
Logical behavior
- Unique name in class entities
- Unique alias, class, classification system in class aliases
- Name in class alias not duplicated in class
What are the benefits?
- Can now have alias for activity classes, so we can have DST as an alias for Drill Stem Test
- Can have alias for material classes, so can allow for sulphur, as well as sulfur
Activity Cause and Effect
- Cause: an activity may be caused by many other activities
- Effect: an activity may cause many other activities
- May be recorded as "intentional"
What are the benefits?
- Previously, could not say "this fishing job was the result of this tool being dropped downhole" - could only have an activity being scheduled to follow another one, or actually following another in time, without knowing that one caused the other.
Facilities & Equipment Improvements
- Some of the current subtypes of Equipment Item moved to the subtypes of Facility; general facility and wellbore component facility.
- There is a new equipment installation subtype: catalog equipment installation, that points to catalog equipment and provides optional count descriptor.
- Start and end time were added to well, wellbore, well completion
What are the benefits?
- Much easier to find spud date and abandon date
- Can now do "60 joints of 2 3/8 N80 tubing" handling of equipment
- More consistent (and hence less confusing) handling of equipment and facilities
Wellbore Components
New Items:
- downhole pump
- downhole valve
- floatshoe
- gauge
- hole in tubing
- mud anchor
- muleshoe
- nipple
- packer
Items moved from Equipment:
- bridge plug
- centralizer
- core bit
- drill bit
- drill pipe
- dst gauge adapter
- hole opener
- stabilizer
- underreamer
- (and others)
Describe composition using a simple "list of parts".
- The parts are identified by the whole.
- The parts are not shared.
Defines connections as a set of things "connected to"
- There is no "connected from" behavior (easier to query)
Start and end times have been added to wellbore facility components
What are the benefits?
- Adds many things previously missing, such as packer, sliding sleeve, nipple, etc.
- Can state things like "this downhole valve is part of this tubing string" much more easily than before.
- "Tally order" easily recovered.
Geologic Classification
- Rock feature subtypes removed
- Rock feature subtypes information loaded into material class
- Part and assembly of rocks and rock bodies now handled generally.
What are the benefits?
- Rock segments, rocks, samples, etc. can now be classified by many different geologic classifications, so we can assign a chronostratigraphic class as well as a lithostratigraphic, for example.
- We can now say that a core plug comes from a specific core, that these subsurface_rock_segments found in wells X, Y and Z are all part of formation F, etc
Production Data
- Measurement points in wellbore
- Production allocation (shrinkage and split) factors
- Generic produced fluids
- PFNU groups
What are the benefits?
- Better description of wireline formation tests and drilling kicks
- Epicentre is useable for reservoir simulation requiring controls on producing groups
- Now able to describe fluid flows using a non-specific fluid (i.e., "water rate" rather than "Salmon Trend water rate")
- Complete description of pre-allocation field measurements and post-allocated volumes
Changes due to Project Discovery
- Preferred values
- Nominal characteristics for some seismic facility subtypes
- Additional attributes for bin node
- Outline of seismic geometry set or binset grid
- Addresses of facilities
- Classes from POSC/Caesar
- Material, equipment and facility classes
- Well log trace mnemonics
- Version of standard values
- Status of standard values
What are the benefits?
- Extensions to the standard values give a wider basis for common data exchange and application interoperability
- Version and status tells you if a standard instance is "coming" or "going" - helps with planning data and application migration
- Subset awareness
- Versioning of meta data
- Instance token compatibility functions
- Compatibility access migration guide
- Bug fixes in Exchange Operations
- Added PIP/IV specification for Advanced Well Logs to Volume 2
What are the benefits?
- Waveform data, curves and areas
- Mapping waveform data traces to Cartesian plot coordinates
- Azimuthal images
- Tadpole curves
- Fanplots
- More sophisticated drawing attribute controls for trace modulated attributes
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