Patent ID: 8178475

Claim:
A wellbore fluid comprising: an oleaginous continuous phase; a non-oleaginous phase; and a polymeric additive formed by mixing at least one lipophilic monomer and at least one crosslinking agent; wherein the at least one lipophilic monomer is at least one selected from an epoxide-functionalized derivative of at least one selected from soybean oil, linseed oil, rapeseed oil, cashew nut shell oil; perilla oil, tung oil, oiticia oil, safflower oil, poppy oil, hemp oil, cottonseed oil, sunflower oil, high-oleic triglycerides, triglycerides of euphorbia plants, peanut oil, olive oil, olive kernel oil, almond oil, kapok oil, hazelnut oil, apricot kernel oil, beechnut oil, lupine oil, maize oil, sesame oil, grapeseed oil, lallemantia oil, castor oil, herring oil, sardine oil, menhaden oil, whale oil, tall oil, and synthetic aliphatic or aromatic ethers; and wherein the at least one crosslinking agent comprises at least one selected from amines, alcohols, phenols, thiols, carbanions, carboxylates, and mixtures thereof; wherein the at least one lipophilic monomer comprises derivatives of the extracts of cashew nut oil comprising structures represented by formulas: wherein x is an integer selected from 0 to 1; wherein y is an integer selected from 0 to 5; wherein z is an integer selected from 1 to 5; wherein R 1 is selected from H, alkyl, alkenyl epoxide, and derivatives thereof; and wherein R 2 is selected from H alkyl, alkenyl epoxide, and derivatives thereof.