Stable suspension of hydrocolloids

• US 6,221,152 B1
• Filed: 09/08/2000
• Issued: 04/24/2001
• Est. Priority Date: 06/07/1995
• Status: Expired due to Fees

• Current Assignee: Cp Kelco (JM Huber Corporation)
• Original Assignee: Cp Kelco (JM Huber Corporation)
• Inventors: Rakitsky, Walter Gregory, Dial, Harold Dean, Skaggs, Crawford Bryan
• Primary Examiner(s): BRUNSMAN, DAVID M
• Application Number:
  US09/657,615
• Time in Patent Office: 228 Days
• Field of Search: 507/112, 507/113, 507/114, 507/213, 507/214, 507/215, 507/216, 106/162.8, 106/162.9, 106/202.1, 106/729, 106/730, 106/805, 106/823
• US Class Current: 106/805
• CPC Class Codes: C04B 16/02 Cellulosic materials cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24
• CPC Class Codes: C04B 2103/0053 Water-soluble polymers
• CPC Class Codes: C04B 2103/32 Superplasticisers
• CPC Class Codes: C04B 2103/44 Thickening, gelling or viscosity increasing agents
• CPC Class Codes: C04B 2111/70 Grouts, e.g. injection mixtures for cables for prestressed concrete
• CPC Class Codes: C04B 24/16 Sulfur-containing compounds
• CPC Class Codes: C04B 24/18 Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
• CPC Class Codes: C04B 24/22 Condensation or polymerisation products thereof
• CPC Class Codes: C04B 24/2623 Polyvinylalcohols; Polyvinylacetates
• CPC Class Codes: C04B 24/38 Polysaccharides or derivatives thereof C04B24/243 takes precedence
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 40/0035 Processes characterised by the absence of a mechanical mixing step, e.g. "no-mix" processes
• CPC Class Codes: C04B 40/0039 Premixtures of ingredients
• CPC Class Codes: C09K 8/04 Aqueous well-drilling compositions
• CPC Class Codes: C09K 8/206 Derivatives of other natural products, e.g. cellulose, starch, sugars
• CPC Class Codes: C09K 8/22 Synthetic organic compounds
• CPC Class Codes: C09K 8/46 containing inorganic binders, e.g. Portland cement

Abstract

The present invention comprises a stable hydrocolloid welan gum in which a hydrocolloid, preferably welan gum, is uniformly dispersed in a superplasticizer such as sulfonated naphthalene, sulfonated melamine, modified lignosulfate, their derivatives and mixtures thereof. This is then dispersed in a rheological control agent which is a microbially-produced cellulose fiber composition. The composition is rapidly hydratable and useful as a stabilizing additive in many cement and drilling fluid applications, insulation fluids and de-icer compositions.

Claims

1. An oil well spacer fluid comprising a salt solution, a water soluble polymer, a superplasticizer, and a rheological control agent comprising water insoluble microbially derived cellulose fibers.

2. The spacer fluid composition of claim 1, wherein the water soluble polymer is selected from the group consisting of welan gum, xanthan gum, rhamsan gum, heteropolysaccharide S-657, carboxymethylhexyl cellulose, hydroxypropyl cellulose, hydroxyethylcellulose and mixtures thereof.

3. The spacer fluid composition of claim 1, wherein said superplasticizer is selected from the group consisting of organic salts, organic esters and mixtures thereof.

4. The spacer fluid composition of claim 3, wherein said organic salt or ester is selected from the group consisting of lignosulfonate, sulfonated melamine formaldehyde condensates, sulfonated naphthalene-formaldehyde condensates, sulfonic acid esters, carbohydrate esters, their inorganic salts and mixtures thereof.

5. The spacer fluid composition of claim 1, wherein said salt solution is selected from the group consisting of sodium chloride, potassium chloride, calcium chloride and mixtures thereof.

6. The spacer fluid composition of claim 1, wherein said water soluble polymer comprises from about 1.0 wt. % to about 25.0 wt. % of the total weight of the fluid.

7. The spacer fluid composition of claim 1, wherein said superplasticizer comprises from about 25.0 wt. % to about 60.0 wt. % of the total weight of the fluid.

8. The spacer fluid composition of claim 1, wherein said rheological control agent comprises from about 0.01 wt. % to about 1.0 wt. % of the total weight of the fluid.

9. The spacer fluid composition of claim 1, wherein said salt concentration comprises from about 20% w/v to about 35% w/v of the fluid.

10. The spacer fluid of claim 1, wherein said cellulose fiber is produced by the microorganism Acetobacter.

11. A cement or injection grout comprising a uniform suspension of a water soluble polymer, a superplasticizer and a rheological control agent comprising water insoluble microbially derived cellulose fibers.

12. The grout of claim 11, wherein the water soluble polymer is selected from the group consisting of welan gum, xanthan gum, rhamsan gum, heteropolysaccharide S-657, carboxymethylhexyl cellulose, hydroxypropyl cellulose, hydroxyethylcellulose and mixtures thereof.

13. The grout of claim 11, wherein said superplasticizer is selected from the group consisting of organic salts, organic esters and mixtures thereof.

14. The grout of claim 13, wherein said organic salt or ester is selected from the group consisting of lignosulfonate, sulfonated melamine formaldehyde condensates, sulfonated naphthalene-formaldehyde condensates, sulfonic acid esters, carbohydrate esters, their inorganic salts and mixtures thereof.

15. The grout of claim 11, wherein said water soluble polymer comprises from about 1.0 wt. % to about 25.0 wt. % of the total weight of the uniform suspension.

16. The grout of claim 11, wherein said superplasticizer comprises from about 25.0 wt. % to about 60.0 wt. % of the total weight of the suspension.

17. The grout of claim 11, wherein said rheological control agent comprises from about 0.01 wt. % to about 1.0 wt. % of the total weight of the uniform suspension.

18. The grout of claim 11, wherein said cellulose fiber is produced by the microorganism Acetobacter.