Manufacture of intermediate strength proppant or lost circulation material from drill cuttings

Patent metadata

Field	Value
Publication number	US-9714377-B2
Application number	US-201615068202-A
Country	US
Kind code	B2
Filing date	Mar 11, 2016
Priority date	Sep 16, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The present disclosure provides methods and techniques for manufacturing proppant or lost circulation material from drilling cuttings. In an example embodiment, a method for manufacturing proppant or lost circulation material from drilling cuttings includes obtaining solid drilling cuttings from drilling fluid, removing any remaining hydrocarbon from the solid drilling cuttings, and rending the solid drilling cuttings into a powder form. The method further includes using the powdered drilling cuttings as raw material in a proppant or lost circulation material manufacturing process. In an example embodiment, the proppant or lost circulation material manufacturing process can be sintering or flame spheroidization.

First claim

What is claimed is:

1. A method of manufacturing proppant from drilling cuttings, comprising:
obtaining a plurality of drilling cuttings that have been separated from a drilling fluid;
removing hydrocarbon from the plurality of drilling cuttings;
pulverizing the plurality of drilling cuttings into a powder,
wherein the removing and pulverizing steps are done in a thermo-mechanical cuttings cleaner or a grinding/friction based thermal unit, wherein the thermo-mechanical cuttings cleaner or the grinding/friction based thermal unit removes the hydrocarbon from the plurality of drilling cuttings through evaporation and pulverizes the plurality of drilling cuttings into the powder; and
forming a proppant from the powder.

2. The method of manufacturing proppant from drilling cuttings of claim 1 , further comprising:
separating the plurality of drilling cuttings from the drilling fluid.

3. The method of manufacturing proppant from drilling cuttings of claim 1 , further comprising:
simultaneously removing hydrocarbon from the plurality of drilling cuttings and pulverizing the plurality of drilling cuttings.

4. The method of manufacturing proppant from drilling cuttings of claim 1 , wherein removing hydrocarbon from the plurality of drilling cuttings produces recoverable hydrocarbon.

5. The method of manufacturing proppant from drilling cuttings of claim 1 , wherein removing hydrocarbon from the plurality of drilling cuttings comprises evaporating hydrocarbon from the plurality of drilling cuttings.

6. The method of manufacturing proppant from drilling cuttings of claim 1 , wherein forming the proppant comprises applying a flame spheroidization process to the powder.

7. The method of manufacturing proppant from drilling cuttings of claim 1 , wherein forming the proppant comprises applying a sintering process to the powder.

8. The method of manufacturing proppant from drilling cuttings of claim 1 , wherein the proppant is an intermediate or higher strength proppant.

9. The method of manufacturing proppant from drilling cuttings of claim 1 , further comprising:
removing hydrocarbon from the plurality of drilling cuttings and forming the proppant via vitrification.

10. The method of manufacturing proppant from drilling cuttings of claim 1 , further comprising:
separating the proppant into size classes.

11. A method of manufacturing proppant, comprising:
processing a plurality of drilling cuttings in a thermo-mechanical cuttings cleaner or a grinding/friction based thermal unit;
removing hydrocarbon from the plurality of drilling cuttings;
rendering the drilling cuttings into powdered drilling cuttings, wherein the thermo-mechanical cuttings cleaner or the grinding/friction based thermal unit simultaneously evaporates hydrocarbon from the plurality of drilling cuttings and pulverizes the plurality of drilling cuttings;
forming the powdered drilling cuttings into a plurality of pellets;
dropping the plurality of pellets into a flame drop tower;
melting the plurality of pellets inside the flame drop tower, producing a plurality of liquefied pellets; and
solidifying the plurality of liquefied pellets into a proppant.

12. The method of manufacturing proppant of claim 11 , further comprising:
separating the plurality of drilling cuttings from a drilling fluid.

13. The method of manufacturing proppant of claim 11 , wherein removing hydrocarbon from the plurality of drilling cuttings produces a recoverable hydrocarbon.

14. The method of manufacturing proppant of claim 11 , further comprising:
mixing the powdered drilling cuttings with a binding agent to form the plurality of pellets.

15. The method of manufacturing proppant of claim 11 , wherein the flame drop tower comprises an inner column, the inner column comprising a heating zone in an upper portion and a cooling zone in a lower portion connected to and beneath the heating zone, wherein the plurality of pellets melt as they travel through the heating zone and solidify as they subsequently travel through the cooling zone.

16. The method of manufacturing proppant of claim 11 , further comprising:
doping the drilling cuttings or the pellets with an additive to modify one or more characteristics of the proppant.

17. The method of manufacturing proppant of claim 11 , wherein the proppant is at least partially rounded.

18. The method of manufacturing proppant of claim 11 , further comprising:
separating the proppant into size classes.

Assignees

• Chevron Usa Inc

Inventors

• Malachosky Edward
• Getliff Jonathan Mark

Classifications

• E21B43/267

  reinforcing fractures by propping · CPC title

• E21B21/066

  with further treatment of the solids, e.g. for disposal · CPC title

• C09K8/805

  Coated proppants · CPC title

• C09K8/80 Primary

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