Method of Improving Wellbore Integrity and Loss Control
First Claim
1. ) An expandable sealant material for use in improving integrity of a wellbore, said expandable sealant material comprising a reactive expandable filler and elastic-plastic binder.
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Accused Products
Abstract
The present invention pertains to a method for enhancing wellbore integrity and/or for sealing a wellbore by sealing formation or micro-annulus fractures in a wellbore. Such sealing can be at least partially accomplished by the use of timed expansion of an expandable sealant material that is placed a wellbore. The expansion of the expandable sealant material causes the cement surface or formation surface to be compressed, thereby creating a tight seal and/or eliminating annulus cracking, fracture, and/or gas channels in the wellbore. A degradable polymer can be used when restoration of the wellbore formation is desired.
9 Citations
26 Claims
- 1. ) An expandable sealant material for use in improving integrity of a wellbore, said expandable sealant material comprising a reactive expandable filler and elastic-plastic binder.
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19. ) An expandable cement comprising 60-95 wt. % cement and 5-40 wt. % expandable sealant material.
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20. ) A wellbore that includes a casing and an expandable sealant material, said expandable sealant material is a) coated on at least a portion of an outer surface of said casing and/or b) intermixed with concrete that is positioned between said casing and in outer surface of said wellbore.
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21. ) A method for improving integrity of a wellbore comprising:
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a. providing an expandable sealant material; b. providing an oxidizing wellbore fluid, such as an aqueous or CO2-containing wellbore fluid; c. placing said expandable sealant material in said wellbore or formation as a deposit or as a mixture with another material such as cement, mud and/or wellbore fluid; d. exposing said expandable sealant material to the oxidizing wellbore fluid; and
,e. allowing said expandable sealant material to expand to create compressive stresses to said cement layer, mud layer, wellbore wall, liner wall and/or casing wall to facilitate in sealing said wellbore and/or fracture in said wellbore. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification