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US 7,442,249 B2Granted
Cement compositions useful in oil and gas wells
AssigneeBJ Services Company
InventorT. Dan Mueller
Life of this patent
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Abstract
Cement compositions containing low reactivity materials are disclosed. The compositions are useful in conditions involving high temperatures, high pressures, and tectonic forces such as oil and gas wells. The cement compositions display increased compressive strength, flexural strength, and tensile strength. Fractures appear to occur in a non-linear fashion between the Interfacial Transition Zone (ITZ) of the particles, rather than in a straight line such as those observed in conventional cement materials.
Claims19
A cement composition comprising cement and low reactivity particles,
- wherein the low reactivity particles have a size of about 40 mesh to about 250 mesh, and
- wherein the low reactivity particles are present at a concentration of about 30 weight percent to about 100 weight percent, based on the weight of the cement.
A cement composition comprising:
- cement;
- and
- silica sand having a size of about 40 mesh to about 250 mesh, and
- wherein the silica sand is present at a concentration of about 30 weight percent to about 100 weight percent, based on the weight of the cement.
1 more element
Dependencies are inferred from the claim text.