METHOD AND COMPOSITION OF MATTER FOR REDUCING LOST CIRCULATION

• US 20200131420A1
• Filed: 03/15/2018
• Published: 04/30/2020
• Est. Priority Date: 03/17/2017
• Status: Active Application

• Current Assignee: Bastlab, LLC
• Original Assignee: Bastlab, LLC
• Inventors: Carpenter, John, Chatterjee, Tapan
• Application Number:
  US16/493,781
• Publication Number:
  US 20200131420A1
• Time in Patent Office: Days
• CPC Class Codes: C09K 2208/08 Fiber-containing well treatment fluids
• CPC Class Codes: C09K 8/035 Organic additives
• CPC Class Codes: C09K 8/508 macromolecular compounds C09K8/512 takes precedence
• CPC Class Codes: C09K 8/514 of natural origin, e.g. polysaccharides, cellulose C09K8/512 takes precedence
• CPC Class Codes: C09K 8/516 characterised by their form or by the form of their components, e.g. encapsulated material

Abstract

The present invention provides a method and a composition for eliminating or reducing the effects of loss of circulation events. In particular, the present invention provides a fiber-based loss of circulation material which seals fractures during drilling operations.

Claims

1. A method for eliminating or reducing lost circulation from a well, wherein the method comprises:

introducing powder dissolved in water as a treatment fluid into at least a portion of the well, wherein the treatment fluid comprises;

a) a lost-circulation material;

b) wherein the lost-circulation material comprises cellulose;

c) wherein the lost-circulation material is made from bio-degradable products;

d) wherein the lost-circulation material has a specific gravity in a range from about 1.25 to about 1.5;

e) wherein the lost-circulation material has a median particle size in a range from about 80 US Mesh to 110 Mesh value (0.177 mm to 0.149 mm); and

f) wherein the bulk density varies from 0.4 to 0.55 gm/cc.

2. The method according to claim 1, wherein the lost-circulation material is comprised of at least 50% bast fiber cellulosic material.

3. The method according to claim 1, wherein the lost-circulation material comprises:

cellulosic material, a weighting agent and positive water solubility-maintained polysaccharides.

4. The method according to claim 3, wherein the cellulosic material is comprised of bast fiber obtained from the xylem portion of a plant.

5. The method according to claim 1, wherein the lost-circulation material has a median particle size in a range from 80 Mesh to 110 Mesh.

6. The method according to claim 1, wherein the lost-circulation material is in a concentration of at least 1:

10 liquor ratio of the loss prevention fluid.

7. The method according to claim 1, wherein the lost-circulation material is in a concentration in a range of about 10% to 15% weight by volume of the loss prevention fluid.

8. The method according to claim 1, wherein the loss prevention fluid has a sealing time of less than 5 minutes.

9. The method according to claim 1, wherein the loss prevention fluid is a drilling fluid.

10. The method according to claim 1, wherein the loss prevention fluid is a polysaccharide-based fluid.

11. The method according to claim 1, wherein the loss prevention fluid has a sealing pressure of at least 20 psi.

12. The method according to claim 1, wherein the loss prevention fluid has a sealing pressure of at least 100 psi.

13. The method according to claim 1, wherein the median particle size and the concentration of the lost-circulation material is selected such that the loss prevention fluid has a sealing pressure in a range of about 50 to about 100 psi (about 0.3 to about 0.7 MPa).

14. The method according to claim 13, wherein the median particle size of the lost-circulation material is selected such that the loss prevention fluid has a sealing pressure at the bottom-hole pressure of the well.

15. A loss prevention fluid comprising lost-circulation material, wherein the lost-circulation material comprises cellulosic material.

16. The loss prevention fluid of claim 15, wherein the lost-circulation material is comprised of at least 50% bast fiber cellulosic material.

17. The loss prevention fluid of claim 16, wherein the lost-circulation material comprises:

cellulosic material, a weighting agent and positive water solubility maintained polysaccharides.

18. The loss prevention fluid of claim 17, wherein the cellulosic material is comprised of bast fiber obtained from the xylem portion of a plant.

19. The loss prevention fluid of claim 18, wherein the lost-circulation material has a median particle size in a range from 80 Mesh to 110 Mesh.

20. The loss prevention fluid of claim 19, wherein the lost-circulation material is in a concentration of at least 1:

10 liquor ratio of the loss prevention fluid.

21. The loss prevention fluid of claim 20, wherein the lost-circulation material is in a concentration in a range of about 10% to 15% weight by volume of the loss prevention fluid.

22. The loss prevention fluid of claim 21, wherein the loss prevention fluid has a sealing time of less than 5 minutes.

23. The loss prevention fluid of claim 22, wherein the loss prevention fluid is a drilling fluid.

24. The loss prevention fluid of claim 23, wherein the loss prevention fluid is a polysaccharide based fluid.

25. The loss prevention fluid of claim 24, wherein the loss prevention fluid has a sealing pressure of at least 20 psi.

26. The loss prevention fluid of claim 25, wherein the loss prevention fluid has a sealing pressure of at least 100 psi.

27. The loss prevention fluid of claim 26, wherein the median particle size and the concentration of the lost-circulation material is selected such that the loss prevention fluid has a sealing pressure in a range of about 50 to about 100 psi (about 0.3 to about 0.7 MPa).

28. The loss prevention fluid of claim 27, wherein the median particle size of the lost-circulation material is selected such that the loss prevention fluid has a sealing pressure at the bottom-hole pressure of the well.