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→Wireline core barrel
===Wireline core barrel===
===Wireline core barrel===
The wireline core barrel allows drilling or coring without pulling the drill string. This reduces drilling costs by eliminating the need to trip pipe. The maximum size of a wireline core is [[length::30 ft]] long and 2.75 in. wide. The most commonly used tools produce a 2.36-in.-diameter core. For applications in which small diameter samples are adequate, this is a cost effective method.
The wireline core barrel allows drilling or coring without pulling the drill string. This reduces drilling costs by eliminating the need to [[trip]] pipe. The maximum size of a wireline core is [[length::30 ft]] long and 2.75 in. wide. The most commonly used tools produce a 2.36-in.-diameter core. For applications in which small diameter samples are adequate, this is a cost effective method.
The wireline core barrel is designed so that the inner core barrel and bearing assembly can be dropped through the drill string, locked in place for coring, and retrieved by wireline. Sequential cores may be cut or a diamond drilling plug can be dropped into place to drill ahead. The drilling plug may also be retrieved by wireline for inspection or to resume coring. During planning, it is important to check that the inner diameter of the drill pipe is large enough to allow the tool to pass through.
The wireline core barrel is designed so that the inner core barrel and bearing assembly can be dropped through the drill string, locked in place for coring, and retrieved by wireline. Sequential cores may be cut or a diamond drilling plug can be dropped into place to drill ahead. The drilling plug may also be retrieved by wireline for inspection or to resume coring. During planning, it is important to check that the inner diameter of the drill pipe is large enough to allow the tool to pass through.