Landmark Compass培训PPT

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Geodesy
Geodetic System
One or more map projections covering adjacent parts of the globe. May be comprised of one or more zones
Geodetic Datum
Defines a common reference and shape for the surface of the earth in the area of interest
Anti-Collision Module
Checks the separation of surveyed and planned wellpaths against any number of offset wells
Site Optimiser Module Determines optimum site location to minimize all drilling.
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Coordinates
EASTING To avoid negative values, the Central Meridian in any zone is defined as 500,000 m.
Central Meridian
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Coordinates
NORTHINGS: Northern Hemisphere
0 meters at the equator and increasing toward the north.
Equator
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Magnetic Declination
DEFINITION: The angle between True North and Magnetic North as measured from True.
CONVERGENCE: Convergence is the correction applied to convert
True North to Grid North. At the central meridian, Grid North equals True
North. Convergence will vary with distance away from the
Lambert Conformal Conic Projection
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Transverse Mercator (TM) System
Transverse form of Mercator projection: This is equivalent to wrapping the cylinder around an Earth ellipsoid so that it touches the central meridian throughout its length.
central meridian and with distance away from the equator.
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Grid Convergence
Quantifies the amount of distortion for each mapping area
Is applied to each survey
Errors intrinsic in wellbore surveying
• A Company may have several Fields • Companies may have different policies on ...
• Anti-collision calculations ... • Survey Calculation methods
Compass - Sign of Magnetic Declination
True North
Magnetic North
Magnetic North
tion
- Magnetic
Declination
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Universal Transverse Mercator
Site
0.0 N/S 0.0 E/W
Drilling Targets
• A Site is a collection of Wells. • The site centre may be given map or geodetic co-ordinates... • And an elevation above a system or Field Datum. • Sites can have drilling targets... • Which can be assigned to a single Wellpath... • Or can be shared amongst more than one Wellpaths
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Universal Transverse Mercator
The earth is divided into 60 zones Any point on the earth may be identified by it’s
▪ Zone number ▪ “Northing” ▪ “Easting” Length is defined in meters
GN TN
LONGITUDINAL UTM ZONE
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Grid Convergence
DEFINITION: The angle between True North and Grid North as measured from True North Easterly Convergence (clockwise) is positive Westerly Convergence (anticlockwise) is negative Convergence is SUBTRACTED from Corrected Azimuth
can be linked other data modules.
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COMPASS Modules
Planning Module
Enables you to design the shape of the proposed wellbore
Survey Module
Calculates a wellpath’s actual trajectory
co-ordinates (angles on a round earth latitude/longitude) to map co-ordinates (distance on a flat map - easting/northing) To do this we must know the geodetic system, the datum and the zone
TN GN
EAST
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Grid Convergence
Sign of Grid Convergence
Central
Grid = True - Conv Meridian
GT
T
-
Grid = True - Conv G
+
TG
Equator GT
+
Grid = True - Conv
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-
Grid = True - Conv 500,000 m
• Survey Tool Error Parameters.
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Vertical Section Origin
Slot
Local Centre
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Field
Geodetic System
Geomagnetic Model
• A Field is a collection of Sites... • Within the same Geodetic System. • All Sites within a Field are aligned to either Grid North or True North • A Field has a System Datum the name given to 0 TVD for the Field e.g.
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What is COMPASS?
A suite of software tools for
Directional Well Planning - Planning Module Survey Management - Survey Module
Calculating positional uncertainty and wellbore separation -
Mean Sea Level. • You can select a Geomagnetic Model to compute magnetic declination.
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Geodesy
Science of measuring earth’s surface Earth is round and maps are flat A geodetic system enables the conversion of geodetic
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0.0 N/S 0.0 E/W
Well
• A Well is a surface location referenced from from the Site local co-ordinate system
• May contain one or more Wellpaths
COMputerized Planning Analysis Survey System
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Drilling and Well Services Software
Compass - Directional Drilling Software Suite Casing Seat - Casing Shoe Setting Depths StressCheck - Casing Design WellCat - Tubular Design/Production Load Analysis Drill Model - AFE Generation WELLPLAN - Engineering Analysis Dims - Drilling Reporting/Data Analysis Profile - Wellbore Schematic/Drilling Data Retrieval