Granted Patent B2

US 12,644,036 · App. 18/893,281 · Granted Jun 2, 2026

Inventors: Radhika Suresh (Sugar Land, TX); Angela Doan (Spring, TX); Rostyslav Dolog (Houston, TX); Oleg Mazyar (Katy, TX)

C09K8/467C04B14/045C04B22/124C04B28/02C04B40/0641E21B33/13C04B2103/10

Abstract

Claims (17)

1 . 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, where the disintegrating agent exerts pressure on the shell from within the accelerator composite thereby breaking the shell;

a cementitious material; and

an aqueous carrier; and

releasing the accelerator from the accelerator composite,

wherein the releasing the accelerator comprises breaking the shell by heating the disintegrating agent.

2 . The method of claim 1 , wherein the cement slurry further comprises an aggregate.

3 . The method of claim 1 , wherein releasing the accelerator comprises breaking the shell by heating the disintegrating agent to cause a phase change material to expand, or to cause a gas-producing material to produce a gas, or a combination thereof.

4 . The method of claim 3 , 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.

5 . The method of claim 3 , 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, a metal hydroxide, an eutectic mixture of an inorganic salt with an organic material, a hydrate of an inorganic salt, a hydrate of metal hydroxide, or an organic material.

6 . The method of claim 1 , wherein the shell comprises at least one of alginate, cellulose, starch, chitosan, dextran sulfate, pectin, xanthan gum, a polymethacrylate, a polydimethylsiloxane, a polystyrene, a polyvinyl acetate, a polyvinylpyrrolidone, silica, alumina, titania, sodium silicate, calcium carbonate, nickel, nickel phosphorus, a nickel alloy, an iron oxide, an oxyhydroxide, or an iron salt.

7 . The method of claim 1 , wherein the accelerator comprises at least one of an alkali metal salt, or an alkali earth metal salt.

8 . The method of claim 1 , wherein the accelerator comprises at least one of sodium meta silicate or calcium chloride.

9 . The method of claim 1 , wherein the accelerator composite further comprises a magnetic material.

10 . The method of claim 9 , wherein the method further comprises applying an electromagnetic radiation to the magnetic material to generate heat.

11 . The method of claim 1 , wherein the accelerator composite is present in an amount of about 0.5 wt. % to about 10 wt. %, based on the total weight of the cementitious material.

Assignments (1)

Continuity (2)

References Cited (120)