A DEVICE FOR CONTROLLING AND ISOLATING A TOOL IN THE FORM OF AN EXPANSIBLE SLEEVE FOR ISOLATING AREAS IN A WELL

摘要

The present invention relates to a device for controlling and isolating a tool for isolating areas in a well which comprises: a main inlet conduit which communicates with the inside of said casing, and which is obturated by a first element able to form a barrier to a fluid circulating in said casing, while yielding beyond a first pressure, this conduit communicating, with two auxiliary conduits, the ends of which join up in order to form an outlet conduit, one of these auxiliary conduits, forming a first chamber, while, in the other one, a second element is provided forming a barrier, moveable between a first position and a second position wherein said first position, said second element forming a barrier and the wall of said second auxiliary conduit make between them a sealed annular chamber in which prevails a so-called <> pressure, this chamber not communicating with the outside, notably with the well.

主权项

1. A device for controlling and isolating a tool in the form of an expansible sleeve for treating a well or a duct, this tool being connected to a casing for supplying a pressurized fluid and is inserted between said casing and the wall of said well or of the duct, which comprises:
a main inlet conduit which communicates with the inside of said casing, and which is obturated by a first element able to form a barrier to a fluid circulating in said casing, while yielding beyond a first predetermined pressure of said fluid, this conduit communicating, downstream from said element forming a barrier, with two auxiliary conduits positioned in parallel, the ends of which join up in order to form an outlet conduit which opens inside the tool, one of the auxiliary conduits, called<> forming, notably with said first element, a first chamber in which prevails an isolation pressure, while in the other one, called <>, a second element is provided, forming a barrier moveable between a first position in which it obturates this second conduit while clearing the communication between the first conduit and the outlet conduit, and a second position in which it prevents any communication between the auxiliary conduits and the outlet conduit, the passing from one position to the other being accomplished by increasing the fluid pressure to a second predetermined pressure greater than said first pressure,wherein in said first position, said second element forming a barrier and the wall of said second auxiliary conduit make between them a sealed annular chamber wherein a so-called <> pressure also prevails, this chamber not communicating with the outside, notably with the well.