Mechanical-hydraulic double-acting drilling jar

Details Mechanical-hydraulic double-acting drilling jar Mechanical-hydraulic double-acting drilling jar

E - Fixed Constructions

21

B

E21B 31/113 (2006.01) E21B 31/107 (2006.01)

Patent

CA 2223144

A mechanical-hydraulic double-acting drilling jar includes an inner tubular mandrel (12)telescopingly supported inside an outer tubular housing (14). The mandrel and the housing each consist of a plurality of tubular segments joined together, preferably by threaded inner connections. Upper (134) and lower (166) pressure pistons are slidably disposed within the housing, respectively closing upper and lower substantially sealed hydraulic chambers (132,164). Longitudinal movement of the mandrel engages the collet (184), which in tum, translates either the upper piston (134) or the lower piston (166), depending on the direction of mandrel movement. As one of the pistons is moved, fluid pressure builds in the associated hydraulic chamber, retarding further movement of the mandrel, enabling potential energy to build in the drill string. The collet is restricted from expanding until the mandrel reaches a particular point in the housing, at which time the collet expands, releasing the mandrel to rapidly collide a hammer surface (32,21) thereon with an anvil surface (44,41) in the housing.

Coulisse de forage mécanique - hydraulique à double effet qui comporte un mandrin intérieur de forme tubulaire (12) monté de façon télescopique à l'intérieur d'un carter extérieur de forme tubulaire (14). Le mandrin et le carter sont, tous deux, constitués de plusieurs segments de forme tubulaire réunis ensemble, de préférence, par des raccords internes à filetage. Des pistons à pression, supérieur (134) et inférieur (166), sont placés coulissants à l'intérieur du carter, fermant respectivement des chambres hydrauliques supérieure et inférieure quasiment hermétiques (132, 164). Un mouvement longitudinal du mandrin le fait venir au contact de la douille (184) qui, à son tour, translate le piston supérieur (134) ou le piston inférieur (166) selon le sens de déplacement du mandrin. Lors du déplacement de l'un des pistons, une pression de fluide s'établit dans la chambre hydraulique associée, retardant un mouvement ultérieur du mandrin, ce qui permet à une énergie potentielle de s'établir dans le train de forage. L'expansion de la douille, qui est entravée jusqu'à ce que le mandrin atteigne un point particulier du carter, a alors lieu, libérant le mandrin qui heurte vivement de sa surface de marteau (32, 21) la surface d'enclume (44, 41) du carter.

Affiliated with

Also associated with

Rating

Mechanical-hydraulic double-acting drilling jar does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mechanical-hydraulic double-acting drilling jar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mechanical-hydraulic double-acting drilling jar will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1396298