Method for making nano- and micro-particles for use as a proppant and fluid-loss-control additive

Patent metadata

Field	Value
Publication number	US-2024150642-A1
Application number	US-202418416019-A
Country	US
Kind code	A1
Filing date	Jan 18, 2024
Priority date	Jan 4, 2019
Publication date	May 9, 2024
Grant date	—

Abstract

Nano- and micro-particles (NMP) can be formed from an oil/water emulsion. The emulsion is made by mixing a liquid solvent, at least one surfactant, a particle-forming compound, and at least curing agent. If desired, pH control agents and viscosity enhancers can be added to the liquid solvent. The particle-forming compound and the curing agents are mixed together and form the oil phase in the emulsion and after curing, the particles are formed. The nano- and micro-particles can be used as proppant to enhance the conductivity of nano- and microfractures and fluid-loss-control additive for hydraulic fracturing operations.

First claim

What is claimed is:

1 . A liquid for making an oil/water emulsion to form a mixture of nano- and micro-particles comprising:
a surfactant; a micro-emulsion flowback aid; seawater; a pH control agent; an epoxy resin; and a curing agent.

2 . The liquid of claim 1 wherein the surfactant is a polyoxyethyene (20) sorbitan monolurate surfactant and comprises between about 2.9-3.7 wt % of the liquid.

3 . The liquid of claim 1 wherein the micro-emulsion aid comprises:
10-20% by weight proprietary ingredient 6615, 10-20% by weight ethoxylated isotridecanol, 1-10% proprietary ingredient 6715, 1-5% solvent naphtha, 0.1-1% by weight naphthalene,
less than 12% by weight “alcohols, C11-14-iso, C13 rich, ethoxylated”, less than 10% by weight polyoxyethylene monobutyl ether, less than 5% propylene glycol, or
less than or equal to 50% by weight proprietary ingredients, less than or equal to 15% by weight solvent naphtha, less than or equal to 10% Ethoxylated alcohol; and
comprises between about 6.7-8.6 wt % of the liquid.

4 . The liquid of claim 1 wherein the seawater comprises between about 29-36.8 wt % of the liquid.

5 . The liquid of claim 1 wherein the pH control agent comprises between about 1.4-1.8 wt % of the liquid.

6 . The liquid of claim 1 wherein the epoxy resin comprises:
90-100% phenol, 4-(1-methylethylidne) Bis, polymer with (chloromethane) Oxecrane, 1-20% epoxide diluent, 0-10% modified epoxy novalac, 1-0.5% non-silicone additive,
an epoxy embedding medium, or
a 75-90% by weight modified derivatives of bisphenol a resins, 5-10% by weight modified derivative of cycloaliphatic resin, 1-3% by weight acrylated monomer, and 3-10% by weight glycidyl ether (c12-c14 alkyloxy); and
comprises between about 29.6-36.8 wt % of the liquid.

7 . The liquid of claim 1 wherein the curing agent comprises
5-15% by weight benzyl alcohol, 15-35% by weight isophoromediamine adduct, and 50-60% by weight aliphatic amine adduct, or
30-60% by weight 4,4 Methylenebis(cyclohexylamine), 30-50% by weight 3,3(Oxybis(2,1 ethane-diloxy))bis 1-propanamine, or
75-90% by weight modified derivatives of bisphenol a resins, 5-10% by weight modified derivative of cycloaliphatic resin, 1-3% by weight acrylated monomer, and 3-10% by weight glycidyl ether (c12-c14 alkyloxy); and
comprises between about 12.3-30.0 wt % of the liquid.

8 . The liquid of claim 1 further comprising a viscosity enhancer comprising calcium carbonate nanoparticles, silicate nanoparticles, or water-soluble polymers comprising polyacrylamide or polyvinyl alcohol

9 . The liquid of claim 1 wherein a size of the micro-particles formed from the liquid is from about 100 μm to 1 μm.

10 . The liquid of claim 1 wherein the pH of the liquid is above 12.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc
• China Nat Petroleum Corp

Inventors

• Lin Lijun
• Huang Jiangshui
• Liu Fuchen
• Song Lulu
• Yang Zhenzhou
• Liu Yu
• Wang hanxiao

Classifications

• C09K8/80 Primary

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C09K2109/00

  pH regulation · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title

• C09K8/88

  macromolecular compounds · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title