Patent ID: 7413008

Claim:
A tool for fluid filling and circulation during oilfield well tubing, the tool capable of being positioned in drilling equipment having a block ( 2 ), a hook ( 4 ) supported by the block, tube elevating means ( 1 ), and connectors ( 3 , 3 ′) spaced from one another and connecting the block to the tube elevating means, comprising: an upper core ( 10 ) adapted to oscillate on the hook; two opposed side members ( 8 ) and ( 9 ) attached to the upper core; a transverse member ( 7 ) adapted to hang on the hook, the transverse member extending from one of the side members to the other of the side members; a telescopic dynamic hydraulic positioning device ( 6 ) connected to the upper core ( 10 ), wherein the tool has a length, the positioning device operable to increase and decrease the length of the tool to produce mating and decoupling displacements of the tool, and the positioning device includes a first hydraulic cylinder ( 28 ) and a second hydraulic cylinder ( 29 ) of greater diameter than the first hydraulic cylinder, the first hydraulic cylinder being coaxially positioned in the second hydraulic cylinder; an injection head ( 22 ) mounted on the positioning device and defining a confinement chamber ( 44 ) adapted to be connected to a source of drilling mud; and a bushing ( 20 ) mounted on the injection head, the bushing having an internal annular seal ( 25 ) adapted to form a hermetic seal with a tube of the oilfield well tubing by encompassing the tube.