APPARATUS AND METHOD FOR SAMPLING AN EARTH FORMATION THROUGHA CASED BOREHOLE

摘要

An apparatus is disclosed for perforating, testing and resealing casing in an earth formation borehole. The apparatus is moveable through the casing. The apparatus can also be mounted on a wireline, on tubing or on both. A perforating device is mounted in the apparatus for producing a perforation i n the casing. The perforating device contains a flexible drilling means that enabl es the drilling of perforations in the casing of lengths greater than the diameter of the borehole. The apparatus will usually contain components for hydraulic testing and sampling from the formation behind the casing. Also mounted in t he apparatus is a device for plugging and resealing the perforation with a soli d plug.