Methods and compositions for grouting heat exchange pipe
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, W. Andrew Liao, Jason G. Bell
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Abstract
The present invention provides improved methods and compositions for grouting heat exchange pipe in a hole or trench in the ground. The grouting compositions of the invention have quick set and high thermal conductivity properties and are basically comprised of an amorphous silica material, an alkaline earth metal oxide or hydroxide, a water swellable clay and water present in an amount sufficient to form a slurry. The compositions optionally also include a set retarder and a thermal conductivity increasing agent.
Claims14
A method of grouting a heat exchange pipe in a hole or trench in the ground comprising the steps of:
- (a) preparing a quick set grouting composition having high thermal conductivity compared to conventional cement grouts, comprising ASTM Class C fly ash present in an amount in the range of from about 25% to about 50% by weight of said composition;
- a second amorphous silica material selected from the group consisting of condensed silica fume, rice hull ash, natural pozzolan and mixtures of two or more said materials, present in an amount in the range of from about 1% to about 4.5% by weight of said composition;
- a water swellable sodium bentonite clay present in an amount in the range of from about 2% to about 5% by weight of said composition;
- and water present in an amount in the range of from about 30% to about 50% by weight of said composition;
- (b) placing said grouting composition in said hole or trench between the ground and the walls of said pipe;
- and
- (c) allowing said grouting composition to set therein.
A method of grouting a heat exchange pipe in a hole or trench in the ground comprising the steps of:
- (a) preparing a quick set grouting composition having high thermal conductivity compared to conventional cement grouts comprising ASTM Class C fly ash present in an amount in the range of from about 25% to about 50% by weight of said composition, condensed silica fume present in an amount in the range of from about 1% to about 4.5% by weight of said composition, sodium bentonite present in an amount in the range of from about 2% to about 5% by weight of said composition, and fresh water present in an amount in the range of from about 30% to about 50% by weight of said composition;
- (b) placing said grouting composition in said hole or trench between the ground and the walls of said pipe;
- and
- (c) allowing said grouting composition to set therein.
Dependencies are inferred from the claim text.