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Title: Wellbore Seal Repair Using Nanocomposite Materials.


Abstract not provided.

; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the U.S. DOE National Laboratories ? Workshop on Well Integrity for Natural Gas Storage in Depleted Reservoirs and Aquifers held July 12-13, 2016 in Denver, CO.
Country of Publication:
United States

Citation Formats

Matteo, Edward N, Stormont, John C., and Taha, Mahmoud Reda. Wellbore Seal Repair Using Nanocomposite Materials.. United States: N. p., 2016. Web.
Matteo, Edward N, Stormont, John C., & Taha, Mahmoud Reda. Wellbore Seal Repair Using Nanocomposite Materials.. United States.
Matteo, Edward N, Stormont, John C., and Taha, Mahmoud Reda. Wed . "Wellbore Seal Repair Using Nanocomposite Materials.". United States. doi:.
title = {Wellbore Seal Repair Using Nanocomposite Materials.},
author = {Matteo, Edward N and Stormont, John C. and Taha, Mahmoud Reda},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}

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  • Abstract not provided.
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  • Abstract not provided.
  • Nanocomposite wellbore repair materials have been developed, tested, and modeled through an integrated program of laboratory testing and numerical modeling. Numerous polymer-cement nanocomposites were synthesized as candidate wellbore repair materials using various combinations of base polymers and nanoparticles. Based on tests of bond strength to steel and cement, ductility, stability, flowability, and penetrability in opening of 50 microns and less, we identified Novolac epoxy reinforced with multi-walled carbon nanotubes and/or alumina nanoparticles to be a superior wellbore seal material compared to conventional microfine cements. A system was developed for testing damaged and repaired wellbore specimens comprised of a cement sheathmore » cast on a steel casing. The system allows independent application of confining pressures and casing pressures while gas flow is measured through the specimens along the wellbore axis. Repair with the nanocomposite epoxy base material was successful in dramatically reducing the flow through flaws of various sizes and types, and restoring the specimen comparable to an intact condition. In contrast, repair of damaged specimens with microfine cement was less effective, and the repair degraded with application of stress. Post-test observations confirm the complete penetration and sealing of flaws using the nanocomposite epoxy base material. A number of modeling efforts have supported the material development and testing efforts. We have modeled the steel-repair material interface behavior in detail during slant shear tests, which we used to characterize bond strength of candidate repair materials. A numerical model of the laboratory testing of damaged wellbore specimens was developed. This investigation found that microannulus permeability can satisfactorily be described by a joint model. Finally, a wellbore model has been developed that can be used to evaluate the response of the wellbore system (casing, cement, and microannulus), including the use of either cement or a nanocomposite in the microannulus to represent a repaired system. This wellbore model was successfully coupled with a field-scale model of CO 2 injection, to enable predictions of stress and strains in the wellbore subjected to subsurface changes (i.e. domal uplift) associated with fluid injection.« less