Water swellable rubber composition having stable swelling property at high temperatures

a water-swellable rubber and composition technology, applied in the field of water-swellable rubber (or elastomer) compositions, can solve the problems of difficult to achieve a weight swell of over 200%, water-swellable rubber compositions disclosed in the above cited documents also do not perform well under prolonged exposure to high temperature or saline conditions, and achieve high and sustained swelling , the effect of high degree of swelling

Inactive Publication Date: 2015-10-22
ZEON CHEMICALS LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The above objects of the invention were achieved with a water swellable rubber composition comprising (a) a non-water swellable base rubber, (b) an ethylene oxide based hydrophilic elastomer having from zero up to and including 20 mole % of a crosslinkable curable functional group, and (c) a water swellable non-elastomeric material. In one aspect of the invention, the ethylene oxide based hydrophilic elastomer (b) has a low content from zero to less than 5 mole % of crosslinkable curable functional group, which results in a composition having a high constrained swell and satisfactory shape retention. The water swellable rubber composition may also contain a compatibilizing agent.
[0010]This water swellable rubber composition is characterized by high and sustained swelling at elevated temperature, as well as a high degree of swelling at elevated temperatures in electrolytes (saline or acidic) of different types and concentrations. The invention has overcome the problem of low swelling in multivalent salt solutions at high temperature, and the problem of loss of swelling over time at high temperature.

Problems solved by technology

In “free swell” applications the water swellable rubber compositions disclosed in the above cited documents do not perform well under prolonged exposure to high temperature or under saline conditions.
However, with this composition it is difficult to achieve a weight swell of over 200% at a temperature above 80° C., as is required for most oil field applications.
The water-swellable rubber compositions disclosed in the above documents also do not perform well under constrained swell conditions in different saline environments.
However, with this composition it is difficult to achieve a satisfactory constrained swell at a temperature above 80° C., as is required for most oil field applications.
The composition according to U.S. Pat. No. 4,590,227 also does not achieve sufficient constrained swell for oil field applications.

Method used

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  • Water swellable rubber composition having stable swelling property at high temperatures
  • Water swellable rubber composition having stable swelling property at high temperatures
  • Water swellable rubber composition having stable swelling property at high temperatures

Examples

Experimental program
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Effect test

example 1

[0086]In this example the non-water swellable base rubber is a hydrogenated acrylonitrile-butadiene rubber (ZETPOL 2020EP from Zeon Chemicals LP). The ethylene oxide based hydrophilic elastomer having a curable functional group is ZEOSPAN 8030 (from Zeon Chemicals LP). The water swellable non-elastomeric material is a partially neutralized / crosslinked polyacrylic acid sodium salt (AQUA KEEP 10SH-NF: Sumitomo Seika Chemicals Co. Ltd.). Other components are shown in Table 1. These components were blended in a 270 mL Brabender bowl at 70° C. for 15 minutes without curing agent or accelerator. The curing agent and accelerator shown in the table were added during the mill process under cooling. After measuring with MDR 2000 at 100 cpm 0.5° arc for 45 minutes at 160° C., curing was carried out at 160° C. for 15 minutes. To measure the degree of swelling in different electrolyte types and concentrations at different temperatures, button type samples (1 inch dia=meter×0.5 inch thickness) we...

example 2

[0087]The composition of Example 2 was prepared according to the same procedure as in Example 1 except that PLASTHALL 7050 was added. All components and their amounts are shown in Table 1. To measure the degree of swelling in different electrolyte types, at different electrolyte concentrations and at different temperatures, button type samples (1 inch diameter×0.5 inch thickness) were made and tested. The results are shown in FIG. 3.

example 3

[0088]The composition of Example 3 was prepared according to the same procedure as in Example 1 except that PLASTHALL TOTM was added. All components and their amounts are shown in Table 1. To measure the degree of swelling in different electrolyte types, at different electrolyte concentrations and at different temperatures, button type samples (1 inch diameter×0.5 inch thickness) were made and tested. The results are shown in FIG. 3.

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Abstract

A water swellable rubber composition comprising (a) a non-water swellable base rubber, (b) an ethylene oxide based hydrophilic elastomer having from zero up to and including 20 mole % of a crosslinkable curable functional group, and (c) a water swellable non-elastomeric material. The composition has excellent water swell characteristics under prolonged exposure to high temperature and various electrolyte solutions (strongly saline as well as acid conditions) and is particularly suitable for oil field applications. When the ethylene oxide based hydrophilic elastomer (b) has from zero to less than 5 mole % of crosslinkable functional group, the amount of (b) is between about 30 parts and 300 parts by weight based on 100 parts by weight of the base rubber (a) and the amount of (c) is between about 20 parts and 200 parts by weight based on 100 parts by weight of the base rubber (a), the composition is characterized by good shape retention after undergoing constrained swell, as well as a high degree of constrained swell at elevated temperatures in different saline concentrations.

Description

[0001]This application is a division of application Ser. No. 13 / 741,040 filed Jan. 14, 2013, which is a continuation-in-part of application Ser. No. 13 / 447,611 filed Apr. 16, 2012.[0002]The present invention relates to a water swellable rubber (or elastomer) composition which is swellable with water or aqueous fluids, in particular saline fluids or brines.[0003]There has been growing interest in recent years in developing water swellable elastomers, in particular for use in oil fields and similar subterranean applications. For this purpose, U.S. Pat. No. 4,590,227 discloses a homogeneous mixture of an elastomer, a water-absorbent resin and a water soluble resin. JP 3111510 B discloses a water swellable vulcanized rubber which is an ethylene oxide-propylene oxide-allyl glycidyl ether copolymer having 40-90 mole % of ethylene oxide. JP 2004-123887 discloses a water swellable vulcanizable rubber composition comprising an epichlorohydrin elastomeric polymer, a natural or synthetic rubbe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L9/02
CPCC08L2205/03C08L9/02C08L23/16C08L33/10C08L71/02C08L15/005E21B33/1208C08L33/02C08L21/00C08L33/18C08L63/00
Inventor CHOI, SOOBUMJUSTICE, LAWRENCE J.
Owner ZEON CHEMICALS LP
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