Stable suspension of hydrocolloids and superplasticizer

• US 6,106,603 A
• Filed: 04/16/1998
• Issued: 08/22/2000
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: Cp Kelco (JM Huber Corporation)
• Original Assignee: Pharmacia Corporation (Pfizer Inc.)
• Inventors: Rakitsky, Walter, Dial, Harold, Skaggs, Bryan
• Primary Examiner(s): BRUNSMAN, DAVID M
• Application Number:
  US09/061,521
• Time in Patent Office: 859 Days
• Field of Search: 106/724, 106/725, 106/726, 106/730, 106/802, 106/804, 106/805, 106/172.1, 106/191.1, 106/205.01, 106/206.6, 106/287.32, 106/287.35, 523/131, 524/4, 524/5, 507/103, 507/108, 507/110, 507/114, 507/120, 507/124, 507/135
• US Class Current: 106/205.6
• CPC Class Codes: C04B 14/104 Bentonite, e.g. montmorillonite
• CPC Class Codes: C04B 14/106 Kaolin
• CPC Class Codes: C04B 20/026 Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
• CPC Class Codes: C04B 2103/32 Superplasticisers
• 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 24/26 obtained by reactions only involving carbon-to-carbon unsaturated bonds C04B24/243 takes precedence
• CPC Class Codes: C04B 24/38 Polysaccharides or derivatives thereof C04B24/243 takes precedence
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• 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 composition in which preferably welan gum is uniformly dispersed in a superplasticizer solution such as sulfonated naphthalene, sulfonated melamine, modified lignosulfate, their derivatives and solution thereof. The mixture is wet milled to form an extremely fine particle size, from about 3 microns to about 500 microns distribution of the gum. The composition is rapidly hydratable and useful as a stabilizing additive in many cement and drilling fluid applications.

Claims

1. An improved stabilized suspension comprised of a rapidly hydratable hydrocolloid uniformly dispersed in a superplasticizer solution, wherein said hydrocolloid and superplasticizer are milled together to a particle size range of from about 3 μ

m to about 500 μ

m.

2. The stabilized suspension of claim 1 wherein said hydrocolloid is selected from the group consisting of welan gum, hydroxypropylmethyl cellulose, polyvinyl alcohol, hydroxyethyl cellulose, polyacrylamide and mixtures thereof.

3. The stabilized suspension of claim 1 wherein said hydrocolloid is welan gum.

4. The stabilized suspension of claim 1 wherein said superplasticizer solution is selected from the group comprising sulfonated napthalene, sulfonated melamine, modified lignosulfate, their derivatives and mixtures thereof.

5. The stabilized liquid suspension of claim 1 further comprising bentonite, kaolin and a bentonite extender.

6. An improved cementitious grout with improved bond strength, flowability and stability comprising a stabilized suspension consisting of a rapidly hydratable hydrocolloid uniformly dispersed in a superplasticizer solution, wherein said hydrocolloid and superplasticizer are milled together to a particle size range of from about 3 μ

m to about 500 μ

m.

7. The cementitious grout of claim 6 wherein said hydrocolloid is selected from the group consisting of welan gum, hydroxypropylmethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, polyacrylamide and mixtures thereof.

8. The cementitious grout of claim 6 wherein said hydrocolloid is welan gum.

9. The cementitious grout of claim 6 wherein said superplasticizer solution is selected from the group comprising sulfonated napthalene, sulfonated melamine, modified lignosulfate, their derivatives and mixtures thereof.

10. The cementitious grout of claim 6 further comprising bentonite, kaolin and a bentonite extender.

11. An anti-washout composition for flushing subterranean oil formations comprising a liquid stabilized suspension consisting of a rapidly hydratable hydrocolloid uniformly dispersed in a superplasticizer solution, wherein said hydrocolloid and superplasticizer are milled together to a particle size range of from about 3 μ

m to about 500 μ

m.

12. The anti-washout composition of claim 11 wherein said hydrocolloid is selected from the group consisting of welan gum, hydroxypropylmethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, polyacrylamide and mixtures thereof.

13. The anti-washout composition of claim 11 wherein said hydrocolloid is welan gum.

14. The anti-washout composition of claim 11 wherein said superplasticizer solution is selected from the group comprising sulfonated naphthalene, sulfonated melamine, modified lignosulfate, their derivatives and mixtures thereof.

15. The anti-washout composition of claim 11 further comprising bentonite, kaolin and a bentonite extender.