Resin composition, coated particles, injection material and method for injecting injection material into fracture

Patent metadata

Field	Value
Publication number	US-10106729-B2
Application number	US-201414161305-A
Country	US
Kind code	B2
Filing date	Jan 22, 2014
Priority date	Jan 22, 2014
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A resin composition is used for forming a surface layer coating at least a part of an outer surface of a particle. The particle is adapted to be packed into a fracture formed in a subterranean formation, and contains a thermosetting resin and a hydrophilic polymer. It is preferred that the resin composition further contains a surfactant. According to the present invention, it is possible to provide an effect of preventing pieces of core particles from being scattered due to the action of a thermo-setting resin and an effect of improving compatibility with respect to water (that is, fluid repellent with respect to hydrocarbon) due to the action of a hydrophilic polymer in a synergistic manner. This increases conductivity of packed spaces of a subterranean formation (that is, fractures of the subterranean formation) in which coated particles are packed.

First claim

What is claimed is:

1. A resin composition when used for forming a surface layer coating at least a part of an outer surface of a particle, the particle adapted to be packed into a fracture formed in a subterranean formation, the resin composition comprising:
a novolac phenolic resin;
hexamethylenetetramine;
a hydrophilic polymer; and
wherein an amount of the novolac phenolic resin contained in the resin composition is in the range of 70 to 99 wt %;
a nonionic surfactant in an amount in the range of 0.001 to 0.2 wt %;
wherein the nonionic surfactant is an acetylene-type surfactant;
wherein a weight average molecular weight of the hydrophilic polymer is in the range of 100 to 8,000;
wherein the hydrophilic polymer includes 1 to 10 of hydroxyl groups in one molecule thereof; and
wherein an amount of the hydrophilic polymer contained in the resin composition is in the range of 0.001 to 15 wt %.

2. The resin composition as claimed in claim 1 , wherein the hydrophilic polymer contains polyalkylene glycol.

3. Coated particles adapted to be packed into a fracture formed in a subterranean formation, each coated particle comprising:
a core particle having an outer surface; and
a surface layer coating at least a part of the outer surface of the core particle,
wherein the surface layer contains a novolac phenolic resin, hexamethylenetetramine and a hydrophilic polymer;
wherein an amount of the novolac phenolic resin contained in the surface layer is in the range of 70 to 99 wt %;
wherein the surface layer further contains a nonionic surfactant in an amount in the range of 0.001 to 0.2 wt %;
wherein the nonionic surfactant is an acetylene-type surfactant, wherein a weight average molecular weight of the hydrophilic polymer is in the range of 100 to 8,000;
wherein the hydrophilic polymer includes 1 to 10 of hydroxyl groups in one molecule thereof; and
wherein an amount of the hydrophilic polymer contained in the surface layer is in the range of 0.001 to 15 wt %.

4. The coated particles as claimed in claim 3 , wherein the hydrophilic polymer contains polyalkylene glycol.

5. The coated particles as claimed in claim 3 , wherein the surface layer contains the surfactant in the amount in the range of 0.03 to 0.2 wt %.

6. The coated particles as claimed in claim 3 , wherein the surface layer consists essentially of the novolac phenolic resin, hexamethylenetetramine, the hydrophilic polymer and the nonionic surfactant and wherein the novolac phenolic resin forms a thermosetting resin, which is in a cured state or in an uncured state.

7. The coated particles as claimed in claim 3 , wherein an average thickness of the surface layer is in the range of 0.5 to 20 μm.

8. The coated particles as claimed in claim 3 , wherein the surface layer coats 50 to 100% of the outer surface of the core particle.

9. The coated particles as claimed in claim 3 , wherein the core particles contain at least one kind of sand particles and ceramics particles.

10. The coated particles as claimed in claim 3 , wherein an average particle size of the core particles is in the range of 100 to 3,000 μm.

11. The coated particles as claimed in claim 3 , wherein the novolac phenolic resin forms a thermosetting resin, which is in a cured state or in an uncured state.

12. An injection material adapted to be injected into a fracture formed in a subterranean formation, the injection material comprising:
the coated particles defined by claim 3 ; and
a fluid into which the coated particles are dispersed, the fluid for transferring the coated particles to the fracture; and
wherein an amount of the coated particles contained in the injection material is in the range of 1 to 99 wt %.

13. The injection material as claimed in claim 12 , wherein the fluid contains at least one of a solvent, a viscosity modifier, a surface acting agent, a breaker, a viscosity stabilizer, a gelling agent and a stabilizer.

Assignees

• Durez Corp
• Sumitomo Bakelite Co

Inventors

• Rappolt James J
• Santorelli Michael
• Mori Motoko
• Asami Masakatsu

Classifications

• C09K8/805 Primary

  Coated proppants · CPC title