US 12,460,121 B2 · Composition, preparation method for and application of composition, and self-healing method for well cementing in oil/gas field

Abstract

Described are a self-healing composition, and a preparation method for and an application of the composition. The composition is of a core-shell structure; the core contains a hydrogenated styrenic thermoplastic elastomer polymer and an inorganic filler; the shell contains a hydrophilic polymer; the composition has a density of 1.2-2 g/cm3, a water contact angle of no more than 90°, and a diesel oil and/or natural gas absorption expansion ratio of 5-15 times. By coating the hydrogenated styrenic thermoplastic elastomer and the inorganic filler with the hydrophilic (surface polarized) polymer, a core-shell structure is formed. When the composition is used for well cementing in an oil/gas field, the composition has a density and compatibility matching cement mortar and thus can form a uniform and stable cement slurry for well cementing in the oil/gas field, and has excellent oil/gas absorption expansion performance and thus can expand after absorbing oil/gas to perform self-healing.

Claims16

Dependent claims

A composition, wherein the composition has a density of 1.2-2 g/cm3, a water contact angle not more than 90°, and a diesel oil and/or natural gas absorption expansion ratio of 5-15 times,

wherein the composition comprises a hydrogenated styrenic thermoplastic elastomer, a hydrophilic polymer and an inorganic filler, wherein the hydrophilic polymer is coated on the surfaces of said hydrogenated styrenic thermoplastic elastomer and said inorganic filler, a weight ratio of said hydrogenated styrenic thermoplastic elastomer to said inorganic filler is from 30:70 to 70:30:
wherein a weight ratio of the hydrogenated styrenic thermoplastic elastomer to the hydrophilic polymer is from 1:0.01 to 1:10.1, and
wherein the hydrophilic polymer contains hydrophilic functional group, which is one or more selected from the group consisting of a hydroxyl radical, an amino group and a carboxyl group.

A method for preparing a composition, the method comprises the following steps:

(1) uniformly mixing a hydrogenated styrenic thermoplastic elastomer with an inorganic filler to obtain a mixed material, and subjecting the mixed material to extrusion granulation under the melting conditions of said hydrogenated styrenic thermoplastic elastomer;
(2) coating the pellets obtained in step (1) with a hydrophilic polymer to obtain a granular material,
wherein a weight ratio inorganic filler to the hydrogenated styrenic thermoplastic elastomer is from 30:70 to 70:30, and a weight ratio of the hydrogenated styrenic thermoplastic elastomer to the hydrophilic polymer is from 1:0.01 to 1:10.1, and
wherein the hydrophilic polymer contains hydrophilic functional group, which is one or more selected from the group consisting of a hydroxyl radical, an amino group and a carboxyl group.

1 more element

Dependencies are inferred from the claim text.

Composition, preparation method for and application of composition, and self-healing method for well cementing in oil/gas field

Life of this patent

Composition, preparation method for and application of composition, and self-healing method for well cementing in oil/gas field

Life of this patent

Abstract

Claims16