Proppant particles formed from fluid coke and flexicoke, fracturing fluids comprising such proppant particles, and methods related thereto
View Patent ↗A fracturing fluid comprises a carrier fluid and thermally post-treated fluid coke and/or flexicoke proppant particles, comprising fluid coke and/or flexicoke particles, respectively, that have been thermally post-treated to a temperature in a range from 400° C. to 1200° C. for a predetermined duration. A method of utilizing such fracturing fluid comprises introducing the fracturing fluid into a subterranean formation. A method of making such fracturing fluid comprises producing the thermally post-treated fluid coke and/or flexicoke proppant particles by thermally post-treating the fluid coke and/or flexicoke particles, respectively, to the temperature in the range from 400° C. to 1200° C. for the predetermined duration and mixing the thermally post-treated fluid coke and/or flexicoke proppant particles with the carrier fluid, optionally along with one or more other types of proppant particles and/or one or more additives.
1 . A fracturing fluid, comprising:
a carrier fluid; and
first proppant particles selected from thermally post-treated fluid coke proppant particles, thermally post-treated flexicoke proppant particles, and mixtures thereof, wherein the first proppant particles have been thermally post-treated at a temperature in a range from 400 degrees Celsius (° C.) to 1200° C. for a predetermined duration.
2 . The fracturing fluid of claim 1 , wherein the predetermined duration ranges from 1 minute to 24 hours.
3 . The fracturing fluid of claim 1 , wherein the first proppant particles have particle sizes in a range from 5 microns (μm) to 500 μm.
4 . The fracturing fluid of claim 1 , wherein the first proppant particles have an apparent density in a range from 1.0 gram per cubic centimeter (g/cm 3 ) to 2.2 g/cm 3 .
5 . The fracturing fluid of claim 1 , wherein the first proppant particles have a crush strength in a range from 3,000 pounds per square inch (psi) to 15,000 psi.
6 . The fracturing fluid of claim 1 , wherein the first proppant particles have a nanoindentation modulus in a range from 5 gigapascals (GPa) to 50 GPa.
7 . The fracturing fluid of claim 1 , wherein the first proppant particles have a local hardness value as measured through nanoindentation in a range from 1 gigapascal (GPa) to 5 GPa.
8 . The fracturing fluid of claim 1 , wherein the first proppant particles have a carbon content in a range from 60 weight percent (wt %) to 99.5 wt % and a carbon-to-hydrogen (C/H) molar ratio in a range from 25:1 to 100:1.
9 . The fracturing fluid of claim 1 , wherein the first proppant particles comprise degradables at a concentration in a range from 0% to 3%, based on the total weight of the first proppant particles.
10 . The fracturing fluid of claim 1 , wherein the first proppant particles have an impurities content in a range from 1 wt% to 25 wt %, a sulfur content in a range from 0 wt % to 10 wt %, and a nitrogen content in a range from 0 wt % to 3 wt%, based on the total weight of the first proppant particles.
11 . The fracturing fluid of claim 1 , wherein the first proppant particles comprise particles having sizes no greater than 105 microns (μm) at a concentration of no more than 25 weight percent (wt %), based on the total weight of the first proppant particles.
12 . The fracturing fluid of claim 1 , wherein at least a portion of the flexicoke particles comprise at least one of thermally post-treated wet flexicoke fines and/or thermally post-treated dry flexicoke.
13 . The fracturing fluid of claim 1 , further comprising second proppant particles differing from the first proppant particles.
14 . The fracturing fluid of claim 13 , wherein the second proppant particles comprise at least one of:
sand;
fluid coke particles that have not been thermally post-treated;
flexicoke particles that have not been thermally post-treated;
delayed coke particles that have not been thermally post-treated;
thermally post-treated delayed coke particles;
pyrolysis coke particles; and
coal-derived coke particles.
15 . The fracturing fluid of claim 1 , wherein the carrier fluid comprises water.
16 . The fracturing fluid of claim 1 , wherein the carrier fluid is substantially free of water.
17 . The fracturing fluid of claim 1 , further comprising at least one of an acid, a biocide, a breaker, a corrosion inhibitor, a crosslinker, a friction reducer, a gel, an oxygen scavenger, a pH control additive, a scale inhibitor, a surfactant, a weighting agent, an inert solid, a fluid loss control agent, an emulsifier, an emulsion thinner, an emulsion thickener, a viscosifying agent, a foaming agent, a stabilizer, a chelating agent, a mutual solvent, an oxidizer, a reducer, and a clay stabilizing agent.
18 . The fracturing fluid of claim 1 , wherein the predetermined duration ranges from 15 minutes to 4 hours.
19 . The fracturing fluid of claim 1 , wherein the first proppant particles have been thermally post-treated at a temperature in a range from 600 degrees Celsius (°C.) to 1050°C. for the predetermined duration.
20 . The fracturing fluid of claim 1 , wherein the first proppant particles have been thermally post-treated at a temperature in a range from 800 degrees Celsius (°C.) to 1050°C. for the predetermined duration.
21 . The fracturing fluid of claim 1 , wherein the first proppant particles have particle sizes in a range from 50 microns (μm) to 400 um.
22 . The fracturing fluid of claim 1 , wherein the first proppant particles have an apparent density in a range from 1.2 g/cm 3 to 2.0 g/cm 3.
23 . The fracturing fluid of claim 1 , wherein the first proppant particles have a crush strength in a range from 5,000 pounds per square inch (psi) to 15,000 psi.
24 . The fracturing fluid of claim 1 , wherein the first proppant particles have a nanoindentation modulus in a range from 10 gigapascals (GPa) to 40 GPa.
25 . The fracturing fluid of claim 1 , wherein the first proppant particles have a carbon content in a range from 75 wt % to 95 wt %, based on the total weight of the first proppant particles, and a carbon-to-hydrogen (C/H) molar ratio in a range from 50:1 to 100:1.
26 . The fracturing fluid of claim 1 , wherein the first proppant particles are not coated.
27 . The fracturing fluid of claim 1 , wherein at least a portion of the first proppant particles are coated.
28 . The fracturing fluid of claim 1 , wherein the first proppants are prepared by a process comprising:
thermally post-treating fluid coke particles, flexicoke particles, and/or a mixture thereof at a temperature in a range from 400 degrees Celsius (°C.) to 1200°C. for the predetermined duration to obtain thermally post-treated coke particles;
grinding and/or sieving the thermally post-treated coke particles to obtain ground and/or sieved coke particles;
optionally coating the ground and/or sieved coke particles to obtain coated coke particles; and
obtaining the first proppants from the ground and/or sieved coke particles and/or the coated coke particles.
29 . The fracturing fluid of claim 1 , wherein the first proppants are prepared by a process comprising:
grinding and/or sieving fluid coke particles, flexicoke particles, and/or a mixture thereof to obtain ground and/or sieved coke particles;
thermally post-treating the ground and/or sieved coke particles at a temperature in a range from 400 degrees Celsius (°C.) to 1200°C. for the predetermined duration to obtain thermally post-treated coke particles;
optionally coating the thermally post-treated coke particles to obtain coated coke particles; and
obtaining the first proppants from the thermally post-treated coke particles and/or the coated coke particles.
30 . A method, comprising:
introducing a fracturing fluid into a subterranean formation, the fracturing fluid comprising a carrier fluid and first proppant particles selected from thermally post-treated fluid coke proppant particles, thermally post-treated flexicoke proppant particles, and mixtures thereof;
wherein the first proppant particles have been thermally post-treated to a temperature in a range from 400 degrees Celsius (° C.) to 1200° C. for a predetermined duration.
31 . The method of claim 19 , wherein the predetermined duration ranges from 1 minute to 24 hours.
32 . The method of claim 30 , wherein the predetermined duration ranges from 15 minutes to 4 hours.
33 . The method of claim 30 , wherein the first proppant particles have been thermally post-treated at a temperature in a range from 600 degrees Celsius (C) to 1050°C. for the predetermined duration.
34 . The method of claim 30 , wherein the first proppant particles have been thermally post-treated at a temperature in a range from 800 degrees Celsius (°C.) to 1050°C. for the predetermined duration.
35 . The method of claim 30 , wherein the first proppant particles are not coated.
36 . The method of claim 30 , wherein at least a portion of the first proppant particles are coated.
37 . A method of making a fracturing fluid, comprising:
(I) post-treating fluid coke particles, flexicoke particles, or a mixture thereof at a temperature in a range from 400 degrees Celsius (° C.) to 1200° C. for a predetermined duration that is in range from 1 minute to 24 hours to obtain thermally post-treated particles;
(II) obtaining first proppant particles from the post-treated particles; and
(III) combining the first proppant particles with at least a carrier fluid.
38 . The method of claim 37 , wherein at least a portion of the first proppant particles have sizes no greater than 105 microns (μm).
39 . The method of claim 37 , wherein the first proppant particles comprise flexicoke fine particles having sizes no greater than 105 microns (μm), and at least a portion of the flexicoke fine particles are obtained from wet flexicoke fines and/or dry flexicoke fines as produced from the flexicoke production process.
40 . The method of claim 37 , further comprising combining second proppant particles with the carrier fluid.
41 . The method of claim 37 , wherein at least a portion of the first proppants are not coated.
42 . The method of claim 37 , wherein step (II) comprises:
(II.1) grinding and/or sieving the thermally post-treated particles to obtain ground and/or sieved coke particles;
(II.2) optionally coating the ground and/or sieved coke particles to obtain coated coke particles; and
(II.3) obtaining the first proppant particles from the ground and/or sieved coke particles and/or the coated coke particles.
43 . The method of claim 37 , wherein:
in step (I), the fluid coke particles and/or the flexicoke particles and/or the mixture thereof are prepared by a processing comprising:
(Ia) grinding and/or sieving precursor fluid coke particles, precursor flexicoke particles, and/or a mixture thereof to obtain ground and/or sieved coke particles; and
(Ib) obtaining the fluid coke particles, the flexicoke particles, and/or the mixture thereof from the ground and/or sieved coke particles.