Lost circulation material

Patent metadata

Field	Value
Publication number	US-2016137903-A1
Application number	US-201514944403-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Nov 18, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

Fluid compositions including a base fluid and at least one granular hemicellulose material. The base fluid may be an oleaginous fluid or a non-oleaginous fluid. The granular hemicellulose material may have a cumulative particle size distribution D90 of about 4 mm or less and D10 of about 1 mm or greater, or D90 of 2.5 mm or less and D10 of about 1.5 mm or greater, or even D90 of about 3.8 mm or less, and D10 of about 2.4 mm or greater. The granular hemicellulose materials useful may have an average aspect ratio equal to or less than about 5:1, an average aspect ratio equal to or less than about 2:1, or even an average aspect ratio is about 1:1. The granular hemicellulose materials have hemicellulose in an amount from about 10% to about 50% by weight, cellulose in an amount from about 30% to about 50% by weight, and lignin in an amount from about 5% to about 35% by weight. The granular hemicellulose materials may be added to the base fluid in an amount from about 1 ppb to about 50 ppb, or even from about 4 ppb to about 40 ppb. The fluid compositions may be useful for sealing fractures in a subterranean formation, and reducing fluid loss in a subterranean formation.

First claim

We claim:

1 . A wellbore fluid composition comprising:
a base fluid; and, at least one granular hemicellulose material.

2 . The wellbore fluid composition of claim 1 , wherein the base fluid is an oleaginous fluid.

3 . The wellbore fluid composition of claim 1 , wherein the base fluid is a non-oleaginous fluid.

4 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material has a particle size distribution D90 of about 10 mm or less, and D10 of about 0.1 mm or greater.

5 . The wellbore fluid composition of claim 4 , wherein the at least one granular hemicellulose material has a particle size distribution D 90 of about 4 mm or less, and D 10 of about 1 mm or greater.

6 . The wellbore fluid composition of claim 5 , wherein at least one granular hemicellulose material has a particle size distribution D 90 of 2.3 mm or less, and D 10 of about 1.5 mm or greater.

7 . The wellbore fluid composition of claim 5 , wherein the at least one granular hemicellulose material has a particle size distribution D 90 of about 3.8 mm or less, and D 10 of about 2.4 mm or greater.

8 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material has an average aspect ratio equal to or less than about 5:1.

9 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material has an average aspect ratio equal to or less than about 2:1.

10 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material has an average aspect ratio is about 1:1.

11 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material comprises hemicellulose in an amount from about 10% to about 50% by weight, cellulose in an amount from about 30% to about 50% by weight, and lignin in an amount from about 5% to about 35% by weight.

12 . The wellbore fluid composition of claim 1 , wherein the at least one granular hemicellulose material content is from about 1 ppb to about 50 ppb.

13 . The wellbore fluid composition of claim 12 , wherein the at least one granular hemicellulose material content is from about 4 ppb to about 40 ppb.

14 . The wellbore fluid composition of claim 1 further comprising synthetic fiber.

15 . The wellbore fluid composition of claim 1 further comprising particulate solids.

16 . A method of reducing fluid loss in a subterranean formation, the method comprising:
preparing a fluid composition, wherein the fluid composition comprises a base fluid and at least one granular hemicellulose material; and emplacing the fluid loss composition in an interval of the subterranean formation.

17 . The method of claim 16 further comprising applying pressure to the wellbore to drive the fluid loss composition into the formation.

18 . The method of claim 17 further comprising allowing the fluid composition to form a plug or seal in at least one interval of the subterranean formation.

19 . The method of claim 16 , wherein the plug or seal formed is sufficient to withstand applied pressures of up to about 4500 psi.

20 . The method of claim 16 , wherein the at least one granular hemicellulose material has a particle size distribution D90 of about 10 mm or less, and D10 of about 0.1 mm or greater.

21 . The method of claim 16 , wherein the at least one granular hemicellulose material has an average aspect ratio equal to or less than about 5:1.

22 . The method of claim 16 , wherein the at least one granular hemicellulose material content is from about 1 ppb to about 50 ppb.

23 . The method of claim 16 further comprising introducing at least one spacer pill into the wellbore before introducing the fluid composition.

24 . The method of claim 16 further comprising introducing at least one spacer pill after the fluid composition is introduced into the wellbore.

25 . The method of claim 16 further comprising introducing a second fluid composition in a second interval of the wellbore.

26 . A method of sealing a fracture in a subterranean formation, the method comprising:
preparing a fluid loss composition, wherein the fluid loss composition comprises a base fluid and at least one granular hemicellulose material, wherein the at least one granular hemicellulose material has a particle size distribution D90 of about 10 mm or less and D10 of about 0.1 mm or greater, and an average aspect ratio equal to or less than about 5:1, and wherein the at least one granular hemicellulose material content is from about 1 ppb to about 50 ppb; and emplacing the fluid loss composition in the fracture in the subterranean formation.

Assignees

• Mi Llc

Inventors

• Friedheim James
• Moffitt John
• Sheldon Joshua
• Guo Quanxin

Classifications

• C09K8/501

  using spacer compositions · CPC title

• C09K2208/04

  Hulls, shells or bark containing well drilling or treatment fluids · CPC title

• C09K8/502

  Oil-based compositions · CPC title

• C09K8/514

  of natural origin, e.g. polysaccharides, cellulose (C09K8/512 takes precedence) · CPC title

• C09K8/516 Primary

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title