Compass application

（1）Geodetic coordinate system
Geodetic coordinate refers to the latitude and longitude which belongs to the space coordinate system Rectangular coordinate system refers to X and Y coordinate, which belongs to the plane coordinate system
WGS-84 System
（2） Map projection system
TM: From the geometric sense put the imaginary an ellipse column sleeve outside earth reference ellipsoid , and tangent with the central meridian, the central shaft of ellipse Axis is locate on the equator of the ellipsoid . According to the projection conditions , the intersection of latitude and longitude lines in the certain longitude difference scope from the east and west of meridian will is projected on the surface of elliptic cylinder, and expand the cylinder into a plane to obtain the projection.
（2） Treatment of directional well test data Data can be typed or imported , processing method using 5 kinds of Calculation modes meeting the petroleum industry standard : the minimum curvature method, radius of curvature method ,the average angle method balance tangent method, the tangential method. Survey result file can be edited, stitched, printed or analyzed, Enhanced the predicted function from any point to targets.

COMPASS widely applies many software tools which not only is applicable to all oil companies ， also suitable for directional drilling contractor . From the initial design, engineering work to waiting for drilling well design , COMPASS can provide fast, accurate trajectory design and judge the potential problems in the initial stage . The characteristics of all the complex well trajectory design and analysis ，for example: Optional calculation method , Anti-collision drawing , Uncertainty ellipse, Mesh drawing 、
A’
A
Equator
Several projection system：
Coordinate system Projection system Central meridian Scale factor False north False east
BeiJing 54 System
WGS-72 System
（5） Support the database of targets on a site or a
platform .
（6） The 2 and 3 dimensional design becomes very
（7） More targeted area can be Processed in the design of horizontal well . （8） For some more design and survey documents well, System settings survey history retain the check marks, to record change history of a well survey data. （9） Graphics and data input screen is the dynamic connection. （10） Improved graphics processing control and editing functions, high quality graphic output and support printing equipment, improve the reporting function and add the report preview window. （11） Flexible security system and data protection .
(3) Anti-collision calculation Anti-collision calculation function provides network drawing , control cylinder and print output the nearest distance scan result . The unique advantage is 3 dimensional distance analysis ， And can be arbitrarily enlarged on the graphics (narrow), rotation, prediction ,TVD Section examination and equidistant mesh drawing .
二、Basic concept and using method of Compass

1. Basic concepts
（1） Geodetic coordinate system （2） projection system and zone （3） The relationship between geodetic coordinate system and projection system （4） True north, Magnetic north, Grid North (Coordinates north)
M’ E G’ L F G
M
1.Longitude/ meridian (MPM’A’P’A) 2.zero meridian(PEFP’) 3.geodetic longitude ：λ（FLA） 4.equatorial plane A’FGA) titude(MEM’) 6.geodetic latitude :φ（MLA)
2. COMPASS also has some utility ： （1） The data quality checking

The survey system is the first in the world to use variable curve quality control, the method can query to the defects of the standard method.
Compass application
Main Content
Compass： Software description Compass ：Basic concepts and application methods Design method of directional well trajectory
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（3）UTM And geographic data output This model provides a UTM output settings , all measurements can be established in the spherical coordinate . The geographic coordinates (longitude and latitude) output format is for degrees, minutes and seconds. （4）Plot It Support all kinds of large-scale plotter and has the high quality wall display which the user completely control .
1. Compass —The main functions （1） Directional well trajectory design The design environment has the man-machine communication drawing tools ，the user can design according to their specific constraints. many curve types are available under different well section, The curve selection is mainly based on the dogleg as a constant or the build and Turn as constant.