ENHANCED OIL RECOVERY PROCESS USING WATER SOLUBLE POLYMERS HAVING IMPROVED SHEAR RESISTANCE

• US 20130005616A1
• Filed: 03/15/2010
• Published: 01/03/2013
• Est. Priority Date: 03/15/2010
• Status: Abandoned Application

• Current Assignee: SPCM SA
• Original Assignee: SPCM SA
• Inventors: Gaillard, Nicolas, Favero, Cédrick
• Application Number:
  US13/581,527
• Publication Number:
  US 20130005616A1
• Time in Patent Office: Days
• US Class Current: 507/225
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/285 and containing a polyether chain in the alcohol moiety
• CPC Class Codes: C08F 220/56 Acrylamide; Methacrylamide
• CPC Class Codes: C09K 8/588 characterised by the use of specific polymers polymeric surfactants C09K8/584

Abstract

An enhanced oil recovery process using high molecular weight water soluble polymer consisting in: —dispersing said polymer in injection brine, —and then injecting the dispersed polymer in the subterranean formation, characterized in that the high molecular weight water soluble polymer contains at least a non-ionic monomer and at least an amphiphilic monomer containing at least a side chain having an HLB above 4.5, said high molecular weight water soluble polymer having a molecular weight of more than 10 000 000.

Claims

1. An enhanced oil recovery process using high molecular weight water soluble polymer consisting in:

dispersing said polymer in injection brine,

and then injecting the dispersed polymer in the subterranean formation, characterized in that the high molecular weight water soluble polymer contains at least a non-ionic monomer and at least an amphiphilic monomer containing at least a side chain having an HLB above 4.5, said high molecular weight water soluble polymer having a molecular weight of more than 10 000 000.

2. An enhanced oil recovery process according to claim 1, characterized in that the amphiphilic monomer represents less that 10% by weight of the high molecular weight water soluble polymer, preferably between 0.1% and 7%, more preferably between 0.2% and 5%.

3. An enhanced oil recovery process according to claim 1, characterized in that the non-ionic monomer is selected from the group containing acrylamide, methacrylamide, N-vinyl pyrrolidone, N-vinyl formamide, N,N dimethylacrylamide, N-vinyl acetamide, N-vinylpyridine, N-vinylimidazole, isopropyl acrylamide and polyethelene glycol methacrylate.

4. An enhanced oil recovery process according to claim 1, characterized in that the amphiphilic monomer is selected from the group comprising (meth)acrylamide, (meth)acrylic, vinyl, allyl or maleic backbone, having a side group selected from the group of alkyl, arylalkyl containing at least one heteroatom.

5. An enhanced oil recovery process according to claim 1, characterized in that the amphiphilic monomer is selected from the group containing acrylamido undecanoic acid, acrylamido methyl undodecyl sulphonic acid, dimethyl dodecyl propyl methacrylamide ammonium chloride, behenyl 25-ethoxylated methacrylate.

6. An enhanced oil recovery process according to claim 1, characterized in that the high molecular weight water soluble polymer comprises at least one anionic monomer(s) selected from the group comprising, acrylic acid, methacrylic acid and salts thereof, 2-acrylamido-2-methylpropane sulphonic acid (ATBS) and salts thereof.

7. An enhanced oil recovery process according to claim 1, characterized in that the high molecular weight water soluble polymer has a molecular weight from 11.000.000 to 35.000.000.

8. An enhanced oil recovery process according to claim 1, characterized in that the high molecular weight water soluble polymer is obtained by inverse emulsion or water in water polymerisation.

9. An enhanced oil recovery process according to claim 1, wherein the high molecular weight water soluble polymer is injected at a rate of 200 to 7500 ppm.