摘要 |
Retrievable packer for operations in wells cased by means of a casing pipe, the packer being applied in operations involving very high pressures, of up to about 15,000 psi, wherein the packer comprises a connecting head for being fixed to a service pipe, an upper mandrel threaded at a lower mandrel, a balancing liner holder concentrically arranged on the upper mandrel so as to form a space of hydraulic pressure between both, within which space one balancing liner is accommodated, designed to apply a downward force on an annular ledge of the upper mandrel, to offset upwards thrust forces that operate on the tool and the service pipe. |
主权项 |
1. Retrievable packer for operations in wells cased by means of a casing pipe, where the packer is one of the type employed to temporarily or permanently seal the annular space between the casing pipe of the well and a service pipe which is inserted into the casing for operations of treatment of one or more sections of the cased well, the packer comprising:
a head for connection to the service pipe, an upper mandrel, a lower mandrel threaded to the upper mandrel, pistons and clamps for fixing the packer against the casing pipe, arranged to resist the upward and downward forces, respectively, a set of rubber gaskets to seal said annular space, a balancing sleeve holder concentrically arranged one such upper mandrel whereby a hydraulic pressure space is defined between the balancing sleeve holder and the upper mandrel, at least, one balancing sleeve arranged in said hydraulic pressure space, an annular ledge of the upper mandrel, aligned with and arranged below said at least one balancing sleeve, and wherein said pistons and clamps respectively comprise a piston holder body, and a set of clamps. |