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Sealant for forming durable plugs in wells and methods for completing or abandoning wells

a technology of durable plugs and sealants, which is applied in the direction of fluid removal, chemistry apparatus and processes, and wellbore/well accessories, etc., can solve the problems of fracturing typical abandonment plugs made from cement, futile typical plug procedures,

Inactive Publication Date: 2011-08-25
WILD WELL CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a typical plug procedure may be futile as the subsistence may have made the casings 10, 40, 55 unstable subject to continued movement and / or the formation 50 may continue to subside even after abandonment, thereby fracturing typical abandonment plugs made from cement.

Method used

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  • Sealant for forming durable plugs in wells and methods for completing or abandoning wells
  • Sealant for forming durable plugs in wells and methods for completing or abandoning wells
  • Sealant for forming durable plugs in wells and methods for completing or abandoning wells

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Embodiment Construction

[0019]FIGS. 2A-F illustrate a plug and abandon (P&A) operation conducted on the subsided wellbore 5, according to one embodiment of the present invention. FIG. 2A illustrates killing the formation 50. The formation 50 may be killed by pumping in a kill fluid 205, such as seawater or mud. The production tubing 70 and packer 85 may then be removed from the wellbore 5.

[0020]FIG. 2B illustrates plugging the production casing 55 bore by pumping in a multi-layer plug 250. A workstring 210, such as coiled tubing or drill pipe, may be deployed from the platform 30 to a depth proximate to the formation 50. The workstring 210 may be deployed through a bore of the production casing 55. The multi-layer plug 250 may be pumped through the workstring using one or more darts or plugs (not shown). The plug 250 may include a bottom layer 253 of cement, a middle layer 252 of sealant, and a top layer 251 of cement. The cement layers 251, 253 may be Portland cement. The bottom layer 253 may fill in the ...

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Abstract

Embodiments of the present invention generally relate to a sealant for forming durable plugs in wells and method for completing or abandoning wells. In one embodiment, a method of plugging a wellbore includes mixing sealant; mixing cement; pumping the cement and sealant into the wellbore. The cement is above the sealant and the sealant cures to become viscoelastic or semisolid.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]Embodiments of the present invention generally relate to a sealant for forming durable plugs in wells and methods for completing or abandoning wells.[0003]2. Description of the Related Art[0004]FIG. 1A is a cross section of a prior art sub-sea wellbore 5 drilled and completed with a land-type completion 1. A conductor casing string 10 may be set from above sea-level 15, through the sea 20, and into the sea-floor or mudline 25. The conductor casing 10 allows the wellhead (not shown) to be located on a production platform 30 above sea-level 15 rather than on the sea-floor 25. Alternatively, the platform 30 may service a subsea-type completion or a manifold from multiple subsea-type completions.[0005]Once the conductor casing 10 has been set and cemented 35 into the wellbore 5, the wellbore 5 may be drilled to a deeper depth. A second string of casing, known as surface casing 40, may then be run-in and cemented 45 into pla...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/12
CPCC09K8/42C09K8/467E21B33/134E21B33/1208C09K8/512
Inventor MURPHY, CHRISTOPHER JOHNHOFFMAN, COREY EUGENEWATTERS, LARRYSABINS, FREDWATTERS, JEFFREYSONNIER, PAUL L.
Owner WILD WELL CONTROL