Set on demand cement
OwnerRadhika Suresh, Angela Doan +2inventors
InventorsRadhika Suresh, Angela Doan, Rostyslav Dolog, Oleg Mazyar
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Abstract
A method of cementing a wellbore includes injecting into the wellbore a cement slurry containing: an accelerator composite having a shell encapsulating a core including an accelerator and a disintegrating agent, the disintegrating agent including at least one of a phase change material or a gas-producing material; a cementitious material; and an aqueous carrier; and releasing the accelerator from the accelerator composite.
Claims15
A method of cementing a wellbore, the method comprising:
- injecting into the wellbore a cement slurry comprising:
- an accelerator composite having a shell encapsulating a core comprising an accelerator and a disintegrating agent, the disintegrating agent comprising a phase change material;
- a cementitious material;
- and
- an aqueous carrier;
- and
- releasing the accelerator from the accelerator composite, wherein releasing the accelerator comprises breaking the shell by heating the disintegrating agent to cause the phase change material to expand,
- wherein the core comprises the phase change material, and the phase change material comprises at least one of an inorganic salt, an eutectic mixture of inorganic salts, an eutectic mixture of an inorganic salt with an organic material, or a hydrate of an inorganic salt.
A method of cementing a wellbore, the method comprising:
- injecting into the wellbore a cement slurry comprising:
- an accelerator composite having a shell encapsulating a core, wherein the core comprises an inner core of an accelerator, and an outer core of a disintegrating agent disposed between the inner core and the shell, the disintegrating agent comprising a phase change material;
- a cementitious material;
- and
- an aqueous carrier;
- and
- releasing the accelerator from the accelerator composite, wherein the core comprises the phase change material, and the phase change material has a phase transition temperature of about 125° F. (52° C.) to about 1,000° F. (538° C.);
- and a volumetric expansion of at least 3% during a phase transition relative to a volume of the phase change material before the phase transition,
- wherein the phase change material comprises a hydrate of an inorganic salt configured to expand in volume during a phase transition and to release water that generates additional pressure upon vaporization when heated above its boiling point.
A method of cementing a wellbore, the method comprising:
- injecting into the wellbore a cement slurry comprising:
- an accelerator composite having a shell encapsulating a core, wherein the core comprises an inner core of an accelerator, and an outer core of a disintegrating agent disposed between the inner core and the shell, the disintegrating agent comprising a phase change material;
- a cementitious material;
- and
- an aqueous carrier;
- and
- releasing the accelerator from the accelerator composite, wherein the accelerator composite further comprises a magnetic material,
- wherein the phase change material comprises a hydrate of an inorganic salt configured to expand in volume during a phase transition and to release water that generates additional pressure upon vaporization when heated above its boiling point.
Dependencies are inferred from the claim text.