Proppant coating for heavy metal recovery

Patent metadata

Field	Value
Publication number	US-10752830-B2
Application number	US-201615740383-A
Country	US
Kind code	B2
Filing date	Jun 27, 2016
Priority date	Jun 30, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A coated proppant includes a solid core proppant particle and a heavy metal recovery coating, including heavy metal recovery crystals embedded within a polymer resin matrix. A process for the manufacture of a coated proppant includes providing a solid core proppant particle, and forming on the solid core proppant particle, a heavy metal recovery coating including heavy metal recovery crystals embedded within a polymer resin matrix.

First claim

The invention claimed is:

1. A coated proppant, comprising:
a solid core proppant particle; and
a heavy metal recovery coating on the solid core proppant particle, the heavy metal recovery coating including heavy metal recovery crystals embedded within a polymer resin matrix that is a permeable or semi-permeable polymer resin with respect to heavy metals; wherein:
the heavy metal recovery crystals are metal sulfates, metal oxides, or any combination thereof, and the heavy metal recovery crystals include at least 20 wt % of barium sulfate, based on the total weight of the heavy metal recovery crystals in the heavy metal recovery coating, and
the heavy metal recovery crystals are provided in a carrier polymer when forming the heavy metal recovery coating, the carrier polymer being a crosslinkable resin so as to provide the permeable or semi-permeable polymer resin of the polymer resin matrix and including a polyether polyol or a liquid epoxy resin, and the polymer resin matrix includes one or more polyurethane resins, one or more epoxy resins, and/or one or more polyurethane/epoxy hybrid resins.

2. The coated proppant as claimed in claim 1 , wherein the heavy metal recovery crystals include at least 50 wt % of barium sulfate, based on the total weight of the heavy metal recovery crystals in the heavy metal recovery coating.

3. The coated proppant as claimed in claim 1 , wherein the polymer resin matrix is at least one selected from the group of a polyurethane based matrix and an epoxy based matrix.

4. The coated proppant as claimed in claim 1 , wherein the polymer resin matrix is a polyurethane/epoxy hybrid matrix.

5. The coated proppant as claimed in claim 1 , wherein the heavy metal recovery crystals pull radium out of a fracturing fluid surrounding the coated proppant and hold ions of the heavy metals on or within the heavy metal recovery coating.

6. A process for the manufacture of the coated proppant according to claim 1 , the process comprising:
providing the solid core proppant particle; and
forming on the solid core proppant particle, the heavy metal recovery coating including the heavy metal recovery crystals embedded within the polymer resin matrix, the heavy metal recovery crystals are added to the carrier polymer before forming the heavy metal recovery coating.

7. The coated proppant as claimed in claim 6 , wherein the carrier polymer is present in an amount from 15 wt % to 85 wt %, based on the total weight of the heavy metal recovery crystals and the carrier polymer.

Assignees

• Dow Global Technologies Llc

Inventors

• Aou Kaoru
• Medina Juan Carlos
• Goltz H Robert
• Goyal Sachit
• Raghuraman Arjun
• Aguirre Vargas Fabio
• Watkins Avery L
• Reuschle David A
• Johnson Ann F
• Srivastava Yasmin N

Classifications

• C09K8/528

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• B29K2101/12

  Thermoplastic materials · CPC title

• C09K8/805 Primary

  Coated proppants · CPC title

• B29C70/026

  and with one or more layers of pure plastics material, e.g. foam layers (applying a non-preformed coating, e.g. a gel-coat B29C37/0025; with foam blocks B29C70/86) · CPC title