Changes

Designed to recover core from consolidated formations, conventional coring systems consist of an inner core barrel with a core catcher, suspended by a swivel assembly inside of an outer core barrel that is attached to the drill string, and a core bit (Figure 1). As mentioned previously, the final selection of a particular system depends upon the formation, location, and objectives of the coring program.

Designed to recover core from consolidated formations, conventional coring systems consist of an inner core barrel with a core catcher, suspended by a swivel assembly inside of an outer core barrel that is attached to the drill string, and a core bit (Figure 1). As mentioned previously, the final selection of a particular system depends upon the formation, location, and objectives of the coring program.

[[file:conventional-coring_fig1.png|thumb|{{figure number|1}}Conventional core barrel. Copyright: Eastman Christensen, Technical Data Sheet C-105.]]

[[file:conventional-coring_fig1.png|thumb|{{figure number|1}}Conventional core barrel © Eastman Christensen, Technical Data Sheet C-105.]]

Types of inner barrels are summarized in Table 1. Core diameter can vary from 1.75 to 5.25 in. Core length can range from [[length::1.5 ft]] for short radius horizontal wells to greater than [[length::400 ft]] for vertical holes.

Types of inner barrels are summarized in Table 1. Core diameter can vary from 1.75 to 5.25 in. Core length can range from [[length::1.5 ft]] for short radius horizontal wells to greater than [[length::400 ft]] for vertical holes.