Combo hydraulic fracturing fluid concentrate having both drag reduction and sand-carrying properties

Patent metadata

Field	Value
Publication number	US-10323177-B2
Application number	US-201715792742-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Oct 25, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A combo hydraulic fracturing fluid concentrate, is characterized by 1) firstly preparing “water-in-water” dispersion polymer drag reducer A, which is synthesized via dispersion polymerization to obtain water-soluble macromolecular colloidal particles dispersed in an aqueous solution of inorganic salts; 2) secondly, adding a dispersion B, which is a polymeric viscosifier, having shear-thinning properties, dispersed in aqueous inorganic salt solution; wherein the percentage by weight of drag reducing agent to viscosifier dispersion B is 20-80:80-20.

First claim

What is claimed is:

1. A combo hydraulic fracturing fluid concentrate, characterized by 1) firstly preparing “water-in-water” dispersion polymer drag reducer A, which is synthesized via dispersion polymerization to obtain water-soluble macromolecular colloidal particles dispersed in an aqueous solution of inorganic salts; 2) secondly, adding a dispersion B, which is a polymeric viscosifier, having shear-thinning properties, dispersed in aqueous inorganic salt solution; wherein the percentage by weight of drag reducing agent to viscosifier dispersion B is 20-80: 80-20;
wherein, the drag reducing agent A is obtained by dispersion polymerization at elevated temperature with heating a homogenous solution containing water-soluble monomer A1, water-soluble dispersant A2, water-soluble free radical initiator A3, inorganic salt A4, and water A5, under mechanical agitation; wherein, the weight percentages of each component described above, with regard to the total weight of reactant mixture for preparing drag reducer A, are as the following: water-soluble monomers A1: 5.0-20.0%; water-soluble dispersant A2: 0.1-5.0%; water-soluble radical initiator A3: 0.000001-0.100%; inorganic salt A4: 15.0-40.0%; water A5: remainder, wherein the water-soluble monomer A1 is hydroxyethyl acrylate, the water-soluble dispersant A2 is poly {[2-(methacryloyloxy)ethyl]trimethylammonium chloride};
wherein the viscosifier dispersion B is composed of shear-thinning polymer B1, inorganic salt B2 and water B3; wherein the weight percentages of each component based on the total weight of the viscosifier dispersion B are: shear-thinning polymer B1: 0.1-30.0%; inorganic salt B2: 10.0-50.0%; water B3: remainder, wherein the shear-thinning polymer B1 is xanthan gum.

2. The combo hydraulic fracturing fluid concentrate as described in claim 1 , wherein the water-soluble free radical initiator A3 is one or more of initiators selected from the group consisting of water-soluble initiators including ammonium persulfate, sodium persulfate, potassium persulfate, hydrogen peroxide, 2,2′-azobisisobutylamidine dihydrochloride, 2,2′-azo[2-(2-imidazolin-2-yl) propane] dihydrochloride, and 4,4′-azobis(4-cyanovaleric acid).

3. The combo hydraulic fracturing fluid concentrate as described in claim 1 , wherein the inorganic salt A4 is one or more of the inorganic salts selected from the group consisting of sodium chloride, ammonium chloride, ammonium bicarbonate, ammonium carbonate, ammonium sulfate, potassium chloride, sodium sulfate, aluminum tribromide, aluminum trichloride, aluminum nitrate, aluminum sulfate, potassium aluminum sulfate, ammonium chromate, ammonium chlorate, ammonium nitrate, ammonium sulfamate, ammonium sulfide, ammonium sulfite, ammonium perchlorate, barium nitrate, barium oxalate, cesium chloride, cesium chromate, calcium chloride, calcium chromate, calcium oxalate, copper nitrate, copper sulfate, ferrous chloride, ferric chloride, lithium bromide, lithium carbonate, lithium chloride, lithium hypochlorite, lithium chlorate, lithium perchlorate, lithium iodide, lithium nitrate, lithium sulfide, lithium sulfite, lithium sulfate, magnesium chloride, magnesium perchlorate, magnesium sulfate, manganese dichloride, manganese trichloride, potassium bromide, potassium bicarbonate, potassium bisulfite, potassium carbonate, potassium chlorate, potassium iodide, potassium nitrate, potassium iodate, potassium permanganate, potassium sulfate, potassium sulfite, potassium sulfide, rubidium bromide, rubidium chloride, rubidium iodide, rubidium nitrate, silver nitrate, sodium bicarbonate, sodium bisulfite, sodium borate, sodium borohydride, sodium bromide, sodium bromate, sodium carbonate, sodium chlorate, sodium chlorite, sodium sulfite, sodium hydrosulfide, sodium hypochlorite, sodium hypophosphite, sodium nitrate, sodium nitrite, sodium perchlorate, sodium periodate, sodium permanganate, sodium sulfide, strontium carbonate, strontium chloride, strontium nitrate, strontium titanate, stannous chloride, stannic chloride, vanadium chloride, zinc bromide, zinc carbonate, zinc chloride, zinc iodide, zinc sulfate, and zinc sulfide.

4. The combo hydraulic fracturing fluid concentrate as described in claim 1 , wherein the inorganic salt B2 is one or more of the inorganic salts selected from the group consisting of sodium chloride, ammonium chloride, ammonium bicarbonate, ammonium carbonate, ammonium sulfate, potassium chloride, sodium sulfate, aluminum tribromide, aluminum trichloride, aluminum nitrate, aluminum sulfate, potassium aluminum sulfate, ammonium chromate, ammonium chlorate, ammonium nitrate, ammonium sulfamate, ammonium sulfide, ammonium sulfite, ammonium perchlorate, barium nitrate, barium oxalate, cesium chloride, cesium chromate, calcium chloride, calcium chromate, calcium oxalate, copper nitrate, copper sulfate, ferrous chloride, ferric chloride, lithium bromide, lithium carbonate, lithium chloride, lithium hypochlorite, lithium chlorate, lithium perchlorate, lithium iodide, lithium nitrate, lithium sulfide, lithium sulfite, lithium sulfate, magnesium chloride, magnesium perchlorate, magnesium sulfate, manganese dichloride, manganese trichloride, potassium bromide, potassium bicarbonate, potassium bisulfite, potassium carbonate, potassium chlorate, potassium iodide, potassium nitrate, potassium iodate, potassium permanganate, potassium sulfate, potassium sulfite, potassium sulfide, rubidium bromide, rubidium chloride, rubidium iodide, rubidium nitrate, silver nitrate, sodium bicarbonate, sodium bisulfite, sodium borate, sodium borohydride, sodium bromide, sodium bromate, sodium carbonate, sodium chlorate, sodium chlorite, sodium sulfite, sodium hydrosulfide, sodium hypochlorite, sodium hypophosphite, sodium nitrate, sodium nitrite, sodium perchlorate, sodium periodate, sodium permanganate, sodium sulfide, strontium carbonate, strontium chloride, strontium nitrate, strontium titanate, stannous chloride, stannic chloride, vanadium chloride, zinc bromide, zinc carbonate, zinc chloride, zinc iodide, zinc sulfate, and zinc sulfide.

5. The combo hydraulic fracturing fluid concentrate as described in claim 1 , wherein during the preparation of the dispersion polymer drag reducer A having a drag reduction and sand carrying properties, mutual solvent A6 and hydrophobic monomer A7, or mutual solvent A6 and fluorocarbon-containing monomer A8 may be introduced to the homogeneous solution before polymerization takes place at elevated temperature; thus, the resultant dispersion polymer drag reducer A is a drag reducer basing upon hydrophobic or fluorocarbon-modified water-soluble macromolecules; wherein the mutual solvent A6 is ethylene glycol monobutyl ether; wherein the hydrophobic monomer A7 is methyl acrylate, methyl methacrylate wherein the fluorocarbon-containing monomer A8 is pentafluorophenyl acrylate.

6. The combo hydraulic fracturing fluid concentrate as described in claim 1 , wherein a mix of fluorocarbon surfactant A9 and water-soluble small or macromolecular quaternary ammonium-containing clay stabilizer A10, can be introduced to the dispersion polymer drag reducer A before or after polymerization; or the mix of fluorocarbon surfactant A9 and water-soluble small or macromolecular quaternary ammonium-containing clay stabilizer A10 may be introduced to the combo fracturing fluid concentrate via pre-mixing with the shear-thinning polymer dispersion B; wherein, the said water-soluble fluorocarbon surfactants A9 is water-soluble anionic fluorocarbon surfactants; wherein, the said water-soluble quaternary ammonium-containing clay stabilizer A10 is tetramethylammonium chloride.

Assignees

• Univ Yangtze

Inventors

• Wu Jun
• Yu Wei-Chu

Classifications

• C09K8/80

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

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title

• C09K8/665 Primary

  containing inorganic compounds (proppants C09K8/80) · CPC title

• C09K8/882 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title