Real-Time Visualization and Geometry Reconstruction of Large Oil and Gas Boreholes Based on Caliper Database - Visual Computing: Scientific Visualization and Imaging Systems - page 234

Fig. 13.5 Sample data obtained from Caliper tool

Table 13.1 A sample of some caliper fundamental measures data

Data Sample value Definition

Depth measure 0.07 m Measure's depth

Arm 01 9.37619 in Length of Arm 01

Arm 02 9.01049 in Length of Arm 02

Arm 03 9.15924 in Length of Arm 03

Arm 04 8.29704 in Length of Arm 04

Arm 05 9.21574 in Length of Arm 05

Arm 06 9.59120 in Length of Arm 06

DEVI 1.23091 Deviation from the surface

HAZI 0.01578 Projection of the borehole axis in the horizontal plane

P1AZ 359.99640 Projection of pad 1 in the horizontal plane

13.3.3 Math

At this stage we implement one of the most important parts of the visualization
tool, which is the transformation process of the 2D data obtained by the Caliper
tool into 3D data. This effort is divided in 6 steps as can be see on the following
subtopics.

13.3.3.1 Transformation of the Caliper Arms Length
into a 2D Data

The Caliper data file stores the arms' length as a single value that represents the
distance from the tool center and the arm pad. This data must be transformed into
2D coordinates (and later 3D) in order to build the borehole geometry.
For the sake of simplicity, the tool axes are located in the center of the Cartesian
coordinate system and the direction of the first arm coincides with the positive
X-axis, as shown in Fig. 13.6 . The arms can be described in polar coordinates, so
each coordinate for the other arms can be obtained from equations in Table 13.2 .