Swellable elastomer-based apparatus, oilfield elements comprising same, and methods of using same in oilfield applications
Oilfield elements and assemblies are described comprising, in one embodiment, an elastomeric composition comprising the reaction product of a linear or branched polymer having residual ethylenic unsaturation with an ethylenically unsaturated organic monomer having at least one reactive moiety selected from acid, acid anhydride, and acid salt, the elastomeric composition formed into an oilfield element. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.
1. A swellable elastomeric material for use in a wellbore comprising:
one or more acid grafted elastomers having residual unsaturation;
about 0.5 phr to about 5 phr of one or more ethylenically unsaturated organic monomers comprising one or more acids, anhydrides, or salts thereof;
about 1 phr to about 10 phr of an inorganic swelling agent selected from the group consisting of alkali- or alkaline earth carbonate in the form of carbonate of beryllium, calcium, strontium, magnesium, potassium, or lithium;
about 1 phr to about 10 phr of a vulcanizing agent; and
about 15 phr to about 20 phr of a zwitterionic polymer or monomer.
2. The swellable elastomeric material of claim 1 , further comprising 1 phr to about 40 phr of a fibrous reinforcing material comprising one or more fibrous strands, mats, or woven matrices.
3. The swellable elastomeric material of claim 1 , wherein the acid grafted elastomer having residual unsaturation comprises ethylene-propylene-diene.
4. The swellable elastomeric material of claim 1 , wherein the acid grafted elastomer having residual unsaturation comprises ethylene-propylene-diene and nitrile.
5. The swellable elastomeric material of claim 1 , wherein the acid grafted elastomer having residual unsaturation comprises a mixture of maleic acid and ethylene-propylene-diene or nitrile, or a mixture of maleic acid, ethylene-propylene-diene and nitrile.
6. The swellable elastomeric material of claim 1 , further comprising a thermoplastic polymer.
7. The swellable elastomeric material of claim 1 , further comprising a thermoset polymer.
8. A swellable elastomeric material for use in a wellbore comprising:
one or more acid grafted elastomers having residual unsaturation;
about 0.5 phr to about 5 phr of one or more ethylenically unsaturated organic monomers comprising one or more acids, anhydrides, or salts thereof;
about 1 phr to about 10 phr of an inorganic swelling agent selected from the group consisting of alkali- or alkaline earth carbonate in the form of carbonate of beryllium, calcium, strontium, magnesium, potassium, or lithium; and
about 1 phr to about 10 phr of a vulcanizing agent, wherein the one or more ethylenically unsaturated organic monomers comprises 2-acrylamido-2-methylpropane sulfonic acid.
9. A swellable elastomeric material for use in a wellbore comprising:
one or more acid grafted elastomers having residual unsaturation, wherein at least one acid grafted elastomer consists essentially of ethylene-propylene-diene and maleic acid;
about 0.5 phr to about 5 phr of 2-acrylamido-2-methylpropane sulfonic acid;
about 1 phr to about 10 phr of sodium carbonate; and
about 1 phr to about 10 phr of a vulcanizing agent comprising dicumyl peroxide.
10. The swellable elastomeric material of claim 9 , further comprising about 15 phr to about 20 phr of a zwitterionic polymer or monomer.
11. The swellable elastomeric material of claim 9 , further comprising nitrile rubber or acrylate-based elastomer.
12. The swellable elastomeric material of claim 9 , wherein the maleic acid content of the at least one acid grafted elastomer which consists essentially of ethylene-propylene-diene and maleic acid is 30 phr.