Retrievable packer for operations in cased wells at high pressures

Abstract

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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a Packer, also known as gasket or “Packer” retrievable and usable in operations in wells, which is part of tools used in cased wells, such as oil, gas or water wells. More specifically, the invention primarily refers to a Packer, gasket or well packer, preferably for operations at high pressures, i.e. at pressures above 10,000 psi, which can be used with conventional tubing and / or coiled tubing alone or together with a retrievable plug.[0003]2. Description of the Prior Art[0004]Devices like that of the invention, well known in the art with the popular name “Packer”, are devices or tools currently used as retrievable sealing or packing elements and which are used in wells where it is required to perform works which should be restricted to one or more distinct areas, such as Operations of Acid Stimulation or Fracturing (“fracking”), Case-hardenings, Pressure Testing, etc. These known retrievable ...

AI Technical Summary

Benefits of technology

[0011]It is therefore an object of this invention to provide a new packer capable of solving the above drawbacks, being a packer or gasket which combines in a novel manner elements of support, fixation and sealing as well as valve and pressure equalization elements between the annular p

Problems solved by technology

These known retrievable Packers (Packers or Gaskets), even when operated satisfactorily in most applications, have limitations when pressures involved in the service, such as case-hardening, fracking, etc., exceed values considered high, e.g. between 11,000 and 15,000 Psi.

In such cases, the packer runs the risk of not remaining fixed in the workplace, with a high possibility of being detached, thus putting the entire system operation at risk.

When the service or treatment involves very high pressures, this function becomes essential and is not satisfied by known packers in the art.

Although this system could better resist upward thrusts, the drawback is that it is required to strain the coiled tubing to fix and pack the tool, limiting the ability of the pipe in terms of pressures of treatment or limiting tensile safety joints.

When the pressure operation occurs

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