Surface Mixing of Encapsulated Plug Components for Well Remediationg

a technology wells, applied in the field of well remediation, wells, remediated wells, etc., can solve the problems of affecting the quality of encapsulated plug components, and causing fractures,

Inactive Publication Date: 2008-10-30
BURTS BOYCE D +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to high pressures involved, squeeze cementing can be accompanied by problems such as propagating fractures.
In addition, the use of conventional Portland cement has several potential problems of its own, particularly where high strength and good adhesion to the borehole wall are needed in order to effect good sealing.
The presence of drilling mud pockets on channels under the primary cement may not only lead to failure of the primary cement job, but can adversely affect the strength of the squeeze cementing job.
In addition, the presence of brine in the well can adversely affect both the primary and remedial cement jobs, increasing setting time and causing loss of strength of the cement.
In spite of the advances in the prior art, conventional cement systems suffer from a 6 hour safety margin to dump the slurry; long set times; low shear bond values; long cement lengths, and long wait on cement (WOC) times causing high expense.

Method used

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Embodiment Construction

[0019]The method of the present invention for remediating an active well involves the use of a two part plugging composition, which is incorporated into known plugging methods. As used herein “active well” refers to any well that is not an abandoned well or one that is not undergoing abandonment. For example, a well during the process of drilling, an operating producing well, and the like.

[0020]The method of the present invention for remediation of an active well involves the use of a two part plugging composition, which is incorporated into known remediation methods.

[0021]The present invention will utilize any of the known agglomeration and encapsulation technology to bind and coat powders into pellets that will perform as described.

[0022]In the present invention, the two powders are pelletized separately to withstand the trip down hole and then release to form a settable mix with water. The encapsulated material is protected from being wetted by well fluids and is of sufficient pa...

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Abstract

A two part encapsulated cementing system is surface mixed and then placed downhole in a method of remediating an active well. This mixture is then placed downhole where it is allowed to degrade in the well fluid allowing for the formation of a cement plug.

Description

RELATED APPLICATION DATA[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 162,456, filed Sep. 9, 2005, herein incorporated by reference, that claimed priority / benefit of U.S. Provisional Patent Application Ser. Nos. 60 / 608,255, 60 / 608,256, and 60 / 608,257, all filed Sep. 9, 2004, and all herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to wells, well operations, to methods, apparatus and products for operating wells. In another aspect, the present invention relates to wells, remediated wells, remediation of wells, to methods, apparatus and products for remediating wells, including oil, gas, water, geothermal, or analogous wells.[0004]2. Brief Description of the Related Art[0005]The hard impermeable mass deposited in the annular space in a well by primary cementing processes is subjected to a number of stresses during the lifetime of the well. The pressure inside the casing can ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C09K8/46
CPCC04B40/0666C09K8/426E21B33/13C04B28/34C04B40/065C04B28/18C04B28/32
InventorBURTS, BOYCE D.BURTS, BOYCE DONALDSABINS, FREDDIE L.WATTERS, LARRY
OwnerBURTS BOYCE D