US2005247238A1PendingUtilityA1

Cement compositions with improved mechanical properties and methods of cementing in a subterranean formation

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Individually held — no corporate assignee on recordPriority: Apr 16, 2003Filed: Jul 18, 2005Published: Nov 10, 2005
Est. expiryApr 16, 2023(expired)· nominal 20-yr term from priority
Inventors:Lance E. BrothersRobert Sepulvado
Y02W30/91C09K 8/46C04B 28/02
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Claims

Abstract

Cement compositions having enhanced mechanical properties and comprising microspheres and carbon fibers are provided herein. The cement compositions comprise a cement material, carbon fibers, microspheres, sufficient water to form a slurry, and optionally other ingredients.

Claims

exact text as granted — not AI-modified
1 . A cement composition comprising: 
 hydraulic cement;    water;    microspheres; and    carbon fibers present in the cement composition in an amount in the range of from about 1% to about 15% by weight of cement.    
   
   
       2 . The cement composition of  claim 1  wherein the hydraulic cement comprises at least one of the following: a Portland cement; a pozzolana cement; a gypsum cement; a high alumina content cements; a silica cements; a high alkalinity cements; and a calcium phosphate cement.  
   
   
       3 . The cement composition of  claim 1  wherein the carbon fibers have a mean length of about 150 microns.  
   
   
       4 . The cement composition of  claim 1  wherein the carbon fibers have a mean length of about 1 mm or less.  
   
   
       5 . The cement composition of  claim 1  wherein the carbon fibers have a mean length of about 50 to about 500 microns.  
   
   
       6 . The cement composition of  claim 1  wherein the carbon fibers have a mean length of about 100 to about 200 microns.  
   
   
       7 . The cement composition of  claim 1  wherein the carbon fibers are milled.  
   
   
       8 . The cement composition of  claim 1  wherein the carbon fibers have a tensile modulus greater than about 180 GPa.  
   
   
       9 . The cement composition of  claim 1  wherein the carbon fibers have a tensile strength greater than about 3000 MPa.  
   
   
       10 . The cement composition of  claim 1  wherein the cement composition has a tensile strength greater than about 183 psi.  
   
   
       11 . The cement composition of  claim 1  wherein the microspheres are present in the cement composition in an amount in the range of from about 10% to about 390% by weight of cement.  
   
   
       12 . The cement composition of  claim 1  wherein the microspheres are present in the cement composition in an amount in the range of from about 20% to about 100% by weight of the cement.  
   
   
       13 . The cement composition of  claim 1  wherein the water is present in the cement composition in an amount in the range of from about 50% to about 350% by weight of cement.  
   
   
       14 . The cement composition of  claim 1  wherein the density of the cement composition is in the range of from about 5 pounds per gallon to about 15 pounds per gallon.  
   
   
       15 . The cement composition of  claim 1  wherein the density of the cement composition is in the range of from about 6 pounds per gallon to about 14 pounds per gallon, wherein the carbon fibers have a mean length of about 100 to about 200 microns, and wherein the microspheres are present in an amount in the range of from about 20% to about 100% by weight of cement.  
   
   
       16 . The cement composition of  claim 1  wherein the microspheres are pre-suspended in water before being introduced into the composition.  
   
   
       17 . The cement composition of  claim 1  wherein the microspheres are dry blended with the cement before the addition of water.  
   
   
       18 . The cement composition of  claim 1  further comprising at least one of the following: a fluid loss control additive, a defoamer, a surfactant, vitrified shale, mica, fiber, fly ash, bentonite, fumed silica, a salt, a dispersing agent, a set accelerator, a formation conditioning agent, and a set retarder.  
   
   
       19 . A cement composition comprising: 
 hydraulic cement;    water;    microspheres present in the cement composition in an amount in the range of from about 10% to about 390% by weight of cement; and    carbon fibers present in the cement composition in an amount in the range of from about 1% to about 15% by weight of cement.    
   
   
       20 . A cement composition comprising: 
 hydraulic cement;    water;    microspheres present in the cement composition in an amount in the range of from about 10% to about 390% by weight of cement; and    carbon fibers having a mean length of about 1 mm or less present in the cement composition in an amount in the range of from about 1% to about 15% by weight of cement.

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