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Title: High temperature lightweight foamed cements

Abstract

Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.

Inventors:
 [1]
  1. (Mastic Beach, NY)
Publication Date:
Research Org.:
ASSOC UNIVERSITIES INC
OSTI Identifier:
867120
Patent Number(s):
US 4871395
Assignee:
Associated Universities, Inc. (Washington, DC) BNL
DOE Contract Number:
AC02-76CH00016
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
temperature; lightweight; foamed; cements; cement; slurries; disclosed; suitable; geothermal; withstand; temperatures; pressures; formulation; consists; silica; flour; water; retarder; foaming; agent; foam; stabilizer; reinforcing; process; producing; silica flour; foaming agent; foam stabilizer; /106/

Citation Formats

Sugama, Toshifumi. High temperature lightweight foamed cements. United States: N. p., 1989. Web.
Sugama, Toshifumi. High temperature lightweight foamed cements. United States.
Sugama, Toshifumi. 1989. "High temperature lightweight foamed cements". United States. doi:. https://www.osti.gov/servlets/purl/867120.
@article{osti_867120,
title = {High temperature lightweight foamed cements},
author = {Sugama, Toshifumi},
abstractNote = {Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1989,
month = 1
}

Patent:

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  • Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 3 figs.
  • Foamed cement slurries that were prepared by mixing a cementitious material having a Class H cement-to-silica flour ratio of 1.0 in conjunction with a alpha-olefin sulfate foam surfactant and a coconut diethanolamide foam stabilizer were exposed in an autoclave at a temperature of 300/sup 0/C and a hydrostatic pressure of 2000 psi (13.79 MPa). One lightweight slurry having a density of 9.61 lb/gal (1.15 g/cc) yielded a cellular cement having a compressive strength at 24 hr of >1000 psi (6.9 MPa) and a water permeability of approx.10/sup -3/ darcys. The factors responsible for the attainment of these mechanical and physicalmore » properties were identified to be well-crystallized truscottite phases and a uniform distribution of discrete fine bubbles. The addition of graphite fiber reinforcement for the cement matrix significantly suppressed any segregation of foam caused by thermal expansion of the air bubbles and further improved the mechanical characteristics of the cured cements.« less
  • A high-flexibility, noncollapsing, lightweight, large-bore, wire-reinforced hose is inside fiber-reinforced PVC tubing that is flexible, lightweight, and abrasion resistant. It provides a strong, kink- and collapse-free conduit for moving large quantities of dangerous fluids, e.g., removing radioactive waste water or processing chemicals.
  • A sintered ceramic composition includes at least 50 wt. % boron carbide and at least 0.01 wt. % of at least one element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy Ho, Er, Tm, Yb, and Lu, the sintered ceramic composition being characterized by a density of at least 90% of theoretical density.
  • A method of making a sintered ceramic composition includes the steps of: providing a powder that includes at least 50 wt. % boron carbide and 0.05 wt. % to 30 wt. % of at least one oxide selected from oxides of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy Ho, Er, Tm, Yb, and Lu; milling the powder to form a milled powder; drying the milled powder to form a milled, dried powder; and consolidating the milled, dried powder at a temperature in the range of 1500.degree. C. to 2200.degree. C. to form a sintered ceramic composition havingmore » a density of at least 90% of theoretical density, the sintered ceramic composition including zirconium diboride in an amount in the range of 1 wt. % to 10 wt. %.« less