Changes

At the well site, cores should be carefully fitted together into ''continuous intervals'', which are defined as lengths of core in which each piece fits into the next. Continuous intervals can vary in length from a few centimeters to [[length::10 m]] or more. Intervals are nomally broken by drill string connection points, core rubble zones, core spinoffs, and the tops and bottoms of core runs.

At the well site, cores should be carefully fitted together into ''continuous intervals'', which are defined as lengths of core in which each piece fits into the next. Continuous intervals can vary in length from a few centimeters to [[length::10 m]] or more. Intervals are nomally broken by drill string connection points, core rubble zones, core spinoffs, and the tops and bottoms of core runs.

Each continuous interval should be marked with a continuous line or lines parallel to the axis of the core. A right angle straight edge can be used to ensure that this ''master orientation line (MOL)''<ref name=pt03r10>Bleakly, D. C., Van Alstine, D. R., Packer, D. R., 1985a, Controlling errors minimizes risk and cost in core orientation in technology: Oil and Gas Journal, v. 83, n. 48, p. 103–110.</ref> is parallel to the core's long axis. Placement of an MOL on each interval can be critical to interpretation of orientation results after the core leaves the wellsite. If mechanical orientation has been done, orientation results can be compared against measurements taken on the core, using the MOL as a baseline.<ref name=pt03r11 /> For core-based orientation techniques, the MOL can serve as the orientation reference line.

Each continuous interval should be marked with a continuous line or lines parallel to the axis of the core. A right angle straight edge can be used to ensure that this ''master orientation line (MOL)''<ref name=pt03r10>Bleakly, D. C., D. R. Van Alstine, D. R. Packer, 1985a, Controlling errors minimizes risk and cost in core orientation in technology: Oil and Gas Journal, v. 83, n. 48, p. 103–110.</ref> is parallel to the core's long axis. Placement of an MOL on each interval can be critical to interpretation of orientation results after the core leaves the wellsite. If mechanical orientation has been done, orientation results can be compared against measurements taken on the core, using the MOL as a baseline.<ref name=pt03r11 /> For core-based orientation techniques, the MOL can serve as the orientation reference line.

==See also==

==See also==