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Zonal isolation system

a technology of zonal isolation and isolation system, which is applied in the direction of sealing/packing, fluid removal, borehole/well accessories, etc., can solve the problems of hydraulic isolation, openhole, and current openhole zonal isolation system not designed to enable long-term

Inactive Publication Date: 2009-11-19
SCHLUMBERGER TECH CORP
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  • Abstract
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AI Technical Summary

Benefits of technology

[0006]In general, a zonal isolation system for use in a well is provided. The zonal isolation system includes a zonal isolation tool, at least one anchor, and at least one polished bore receptacle. The zonal isolation system includes

Problems solved by technology

However, most of the current openhole zonal isolation systems are not designed to enable long term, openhole, hydraulic isolation.
Specific challenges include sealing and anchoring the system, and the ability to allow for expansion and / or contraction due to thermal effects, all located within the openhole interval of a sandface completion.
There are also issues of coping with retaining the differential pressure rating for wider open hole internal diameters or changes in the open hole internal diameter within the specified operating envelope.

Method used

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Embodiment Construction

[0029]In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.

[0030]Described herein is a zonal isolation system 80 for use in wellbores. A “wellbore” may be any type of well, including, but not limited to, a producing well, a non-producing well, an experimental well, and exploratory well, and the like. Wellbores may be vertical, horizontal, any angle between vertical and horizontal, diverted or non-diverted, and combinations thereof, for example a vertical well with a non-vertical component. Also, in the description, the terms “connect”, “connection”, “connected”, “in connection with”, and “connecting” are used to mean “in direct connection with” or “in connection with via another element”. The term “set” is u...

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Abstract

A zonal isolation system for use in a well is provided. The zonal isolation system includes a zonal isolation tool, at least one anchor, and at least one polished bore receptacle. The zonal isolation system may include a setting string for activation of the zonal isolation tool and / or the at least one anchor. The zonal isolation system may also include an isolation string for maintaining separation zones during production or injection of the well.

Description

[0001]This application claims the benefit under 35 U.S.C. § 119(e) of and is a continuation-in-part of U.S. Provisional Application Ser. No. 60 / 594,628, entitled “Zonal Isolation Tool,” filed Apr. 25, 2005; and of U.S. application Ser. No. 11 / 308,617, entitled, “Zonal Isolation Tools and Methods of Use,” filed Apr. 12, 2006, both hereby incorporated by reference.RELATED ART[0002]A zonal isolation tool should provide reliable, long-term isolation between two or more subsurface zones in a well. A typical application would be to segregate two zones in an open-hole region of a well, the zones being separated by a layer of low permeability shale in which the zonal isolation tool is placed. A nominal size configuration would be usable in wellbores drilled with an 8½ inch (21.6 cm) outer diameter bit below 9⅝ inch (24.5 cm) casing, but the use of zonal isolation tools is not limited to any particular size, or to use in open holes. By segregating open-hole intervals, downhole chokes may be ...

Claims

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Application Information

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IPC IPC(8): E21B33/12E21B23/00E21B23/01
CPCE21B23/06E21B33/1216E21B33/129E21B33/1272
Inventor PATEL, DINESH R.GAMBIER, PHILIPPEGARCIA, JOSE F.
Owner SCHLUMBERGER TECH CORP
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