Apache Canada Coordinates Workshop CBM inter-well distance calculation methods used by Apache and ERCB Map projections.

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Presentation transcript:

Apache Canada Coordinates Workshop CBM inter-well distance calculation methods used by Apache and ERCB Map projections

Apache calculation Latitude and longitude of first point is A1 & B1 Latitude and longitude of second point is A2 & B2 The arc distance can be computed as: Arccos [cos(A1)cos(B1)cos(A2)cos(B2) + cos(A1)sin(B1)cos(A2)sin(B2) + sin(A1)sin(A2)]/360 * 2Pi * r In navigation, this is a great circle distance between two points on the surface of a sphere

ERCB calculation Gov’t uses ATS ver 4.1 (MATS 2005) for lat/lon of the nearest section corner ‘Metes and bounds’ from section corner used to validate lat/lon of the surface location Directional/horizontal survey used to compute lat/long of the bottom hole Latitude and longitude of the bottom hole are projected onto a 10TM map projection in their GIS A 3 km buffer circle is created around the control well Wells to be licensed more than 3 km from the control well are non-compliant ERCB is using a 10TM map grid distance between the wells

An example of the differences

The 10TM distance Text Text

Map Projections

Transverse Mercator Projections in Alberta

Metadata – where would you be without it? Lat: ° Lon: °

Metadata – where would you be without it? North: East: UTM Zone 12

Recommendations Inverse between NAD83 UTM coordinates as shown on well site plan for well license application Use online tools as a check

Online Resources Natural Resources Canada – Geodetic Tools Movable Type Scripts – Great Circle Distance United States Geodetic Survey – “Map Projections: A Working Manual” The Geographer’s Craft – Map Projections Moving to NAD83: Impacts and Issues for Oil and Gas Companies… Moving_To_NAD83_BUS-1.pdf Moving_To_NAD83_BUS-1.pdf CAPP: Migrating from NAD27 to NAD83… e6046d67b4a6/CAPP_Migrating-from-NAD27-to-NAD83.aspx e6046d67b4a6/CAPP_Migrating-from-NAD27-to-NAD83.aspx

Questions?