Drilling jar

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/107 (2006.01)

Patent

CA 2723420

A bidirectional drilling jar, capable of repeated unidirectional firing, including a sliding assembly that is disposed in a sliding relation to the interior of a barrel assembly. A portion of the inner diameter of the barrel assembly forms a restricted barrel segment. The restriction intermediate an upper chamber and a lower chamber. A metering system comprising an upper flange a meter valve, and a lower flange. The meter valve slideably disposed on the sliding assembly between the upper and lower flanges. The metering system travels between the upper chamber and the lower chamber providing limited, controlled flow of the fluid contained therein when passing through the restriction in order to pressurize the system and produce a jarring stroke. Alternatively, the metering system comprises an upper flange, a meter ring, a meter valve, and a lower flange. The meter valve and meter ring are slideably disposed on the sliding assembly intermediate the upper and lower flanges.

Linvention concerne une coulisse de forage bidirectionnelle, capable de tir unidirectionnel répété, comprenant un ensemble coulissant qui est disposé dans une relation de coulissement à lintérieur dun ensemble baril. Une partie du diamètre interne de lensemble baril forme un segment de baril limité. La restriction se situe entre une chambre supérieure et une chambre inférieure. Un système de mesure comporte une bride supérieure, une soupape dintroduction et une bride inférieure. La soupape dintroduction est disposée de manière coulissante sur lensemble coulissant entre les brides supérieure et inférieure. Le système de mesure se déplace entre la chambre supérieure et la chambre inférieure fournissant un écoulement régulé et limité du fluide contenu à lintérieur lorsquil traverse la restriction afin de mettre sous pression le système et de produire une course de battage. En variante, le système de mesure comporte une bride supérieure, une bague dintroduction, une soupape dintroduction et une bride inférieure. La soupape dintroduction et la bague dintroduction sont disposées de manière coulissante sur lensemble coulissant entre les brides supérieure et inférieure.

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