[auscope-geosciml] GeoSciML3 Borehole Collar [SEC=UNCLASSIFIED]

Dale.Percival at ga.gov.au Dale.Percival at ga.gov.au
Mon Jun 20 19:40:38 EDT 2011


Exposing my lack of practical knowledge in boreholes… ☺

Dale Percival | Division Architect
________________________________
Information Development and Analysis Services
PMD
Tel x9265 | Mobile 0448 674 582
-----Original Message-----
From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Bruce.Simons at dpi.vic.gov.au
Sent: Tuesday, 21 June 2011 8:44 AM
To: auscope-geosciml at lists.arcs.org.au
Subject: Re: [auscope-geosciml] GeoSciML3 Borehole Collar [SEC=UNCLASSIFIED]

The issue is that the Borehole reference point (the collar) may change over the life of the Borehole.

For Petroleum wells the original reference point is usually the KB, and all wireline logs, samples etc are measured relative to this. But there is also the ground height (or subsea height) that represents a different "collar" location.

For Water Bores the top of casing is usually the reference point, and again this is different to ground height. A further complication is that this casing height may change over time for water monitoring bores as the casing is replaced.

Life is usually fairly simple for mineral, coal and engineering bores, where irrespective of the height of the drill rig, the ground surface is usually provided as the reference height.  However, in some areas, such as the LaTrobe Valley where there is significant de-watering occurring, even this ground height may change over time.

So the aim is to be able to capture these variations, of which there are at least two usually required (KB/Casing and ground height) along with the date they apply to (period?) and the role of the collar location.

----------------------------------------------------
Bruce Simons
Senior Information Geoscientist
IUGS-Commission for Geoscience Information Oceania Councillor
GeoScience Victoria/Australian Spatial Research Data Commons
Level 9, 55 Collins St
PO Box 4440
Melbourne, Victoria, 3001
Australia

Ph: +61-3-9658 4502
Fax: +61-3-9658 4555
Mobile: +61 429 177155



From:        <Dale.Percival at ga.gov.au>
To:        <auscope-geosciml at lists.arcs.org.au>
Date:        21/06/2011 08:34 AM
Subject:        Re: [auscope-geosciml] GeoSciML3 Borehole Collar [SEC=UNCLASSIFIED]
Sent by:        auscope-geosciml-bounces at lists.arcs.org.au
________________________________



I hope I’m missing something obvious here but I assumed a collar is the physical item (casing) that maintains the integrity of the top of the borehole.

Does the position of a borehole collar depend on the purpose of the borehole? The difference between an exploration and a production well (apologies for the petroleum perspective), exploration uses the KB and production uses the point on the earth’s surface?

Conceptually I would have thought that the importance of the borehole would be the point of origin on the earth’s surface. Once a machine has been removed from the location the only remaining physical structure is the borehole collar, is it important to know what the height of the rig/truck was from that point?


________________________________

From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Bruce.Simons at dpi.vic.gov.au
Sent: Thursday, 16 June 2011 3:59 PM
To: auscope-geosciml at lists.arcs.org.au
Subject: Re: [auscope-geosciml] GeoSciML3 Borehole Collar [SEC=UNCLASSIFIED]

> allow 1..* collarLocation with an associated role


----------------------------------------------------
Bruce Simons
Senior Information Geoscientist
IUGS-Commission for Geoscience Information Oceania Councillor
GeoScience Victoria/Australian Spatial Research Data Commons
Level 9, 55 Collins St
PO Box 4440
Melbourne, Victoria, 3001
Australia

Ph: +61-3-9658 4502
Fax: +61-3-9658 4555
Mobile: +61 429 177155



From:        <Oliver.Raymond at ga.gov.au>
To:        <auscope-geosciml at lists.arcs.org.au>
Date:        16/06/2011 03:40 PM
Subject:        Re: [auscope-geosciml] GeoSciML3 Borehole Collar [SEC=UNCLASSIFIED]
Sent by:        auscope-geosciml-bounces at lists.arcs.org.au

________________________________




If more than one collar elevation is given, then there must also be a mechanism to tell which elevation is the one used as the zero starting point (ie, the CRS) for downhole measurements for MappedIntervals.  Any ideas from Bruce, Gilly?

Cheers,
Ollie




________________________________


From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Guillaume.Duclaux at csiro.au
Sent: Thursday, 16 June 2011 3:23 PM
To: auscope-geosciml at lists.arcs.org.au
Subject: Re: [auscope-geosciml] GeoSciML3 Borehole Collar

I totally support for first point Bruce. In the pressureDB petroleum wells service available via the AuScope portal we had to impose the use of the seafloor elevation (bathymetry?) to provide the elevation value 'from ground surface'. All the logs are usually referenced from the rotary tables. Should be very good to be able to encode more than one collar.

Cheers

Gilly

From: Bruce.Simons at dpi.vic.gov.au [mailto:Bruce.Simons at dpi.vic.gov.au]
Sent: Thursday, June 16, 2011 03:17 PM
To: auscope-geosciml at lists.arcs.org.au <auscope-geosciml at lists.arcs.org.au>
Subject: [auscope-geosciml] GeoSciML3 Borehole Collar

Hi all,
Mapping hydrological bores from Ballarat University and Victorian Future Farming Systems Research, and DPI's Petroleum Wells has indicated that BoreholeCollar:elevation is more complex than currently captured in GeoSciML v2. There are two issues:

1. Multiple BoreholeCollar:elevations
Petroleum Wells usually have a Kelly Bush elevation and a ground level elevation. Similarly Water wells usually have a 'natural surface' elevation and a 'top casing' elevation.
Currently GeoSciML only has an elevation property, so it is unclear which of these should be used. GroundWaterML 1 has a 'referenceElevation' to indicate the elevation other values (such as water level) relate to.

I think both referenceElevation and groundElevation should be available.
Really CollarLocation should be a 3D point, but we have split the elevation and location data for software reasons.

I think we should either have two elevation properties on BoreholeCollar, or preferably allow 1..* collarLocation with an associated role.  Perhaps we should also bite the bullet and combine elevation and location into a 3D BoreholeCollar. The elevation notes state: "Compromise approach to supply elevation explictly for location; this is to allow for software that cannot process 3-D GM_Point. "

2. Some Borehole Casing height values vary with time as farmers drive over the casing, the hole is re-cased etc. I'm not sure if this happens in the mineral, engineering and petroleum industries.
A request has been made by the hydrogeologists to add a date stamp to the BoreholeCollar so these changes can be tracked.

----------------------------------------------------
Bruce Simons
Senior Information Geoscientist
IUGS-Commission for Geoscience Information Oceania Councillor
GeoScience Victoria/Australian Spatial Research Data Commons
Level 9, 55 Collins St
PO Box 4440
Melbourne, Victoria, 3001
Australia

Ph: +61-3-9658 4502
Fax: +61-3-9658 4555
Mobile: +61 429 177155

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