Changes

The sponge coring system consists of a conventional core barrel fitted with a series of sponge-lined aluminum inserts (Figure 2). The system cuts a relatively small core, 2.5 or 3.25 in. wide and [[length::30 ft]] long. The sponge liner catches oil that “bleeds” out of the rock as the core is pulled (tripped) from the hole. The oil-wet sponge holds oil tightly, while allowing water and gas to move through the sponge and out vent holes drilled in the aluminum liner. Sponge and conventional cores may be cut one after another without making special trips to open the hole, so it is possible to “spot” a sponge core and still acquire larger diameter cores for other analyses.

The sponge coring system consists of a conventional core barrel fitted with a series of sponge-lined aluminum inserts (Figure 2). The system cuts a relatively small core, 2.5 or 3.25 in. wide and [[length::30 ft]] long. The sponge liner catches oil that “bleeds” out of the rock as the core is pulled (tripped) from the hole. The oil-wet sponge holds oil tightly, while allowing water and gas to move through the sponge and out vent holes drilled in the aluminum liner. Sponge and conventional cores may be cut one after another without making special trips to open the hole, so it is possible to “spot” a sponge core and still acquire larger diameter cores for other analyses.

[[file:conventional-coring_fig2.png|thumb|{{figure number|2}}Sponge-lined coring system. Copyright: DBS, a Baroid Company.]]

[[file:conventional-coring_fig2.png|thumb|{{figure number|2}}Sponge-lined coring system. © DBS, a Baroid Company.]]

===Full-closure coring systems===

===Full-closure coring systems===