A method for enhanced oil recovery from a hydrocarbon bearing subterranean formation, the method comprising: withdrawing hydrocarbons from a production well extending into the hydrocarbon bearing subterranean formation; identifying a high permeability streak in the hydrocarbon bearing subterranean formation; injecting a dense carbon dioxide composition from an injection well into the high permeability streak of the hydrocarbon bearing subterranean formation, where: the dense carbon dioxide composition comprises dense carbon dioxide and a thickener soluble in the dense carbon dioxide, and the thickener comprises a copolymer, the copolymer being the polymerized reaction product of monomers that include: at least one alkenyl ether or dialkenyl ether monomer; at least one acrylate or methacrylate monomer; at least one structural monomer selected from the group consisting of an acrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, a methacrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, styrene, methyl styrene, phenylpropene, and combinations of these; and at least one allyl ester monomer; and after injecting the dense carbon dioxide composition into the high permeability streak, injecting an aqueous treatment fluid from the injection well into the hydrocarbon bearing subterranean formation, wherein: the dense carbon dioxide composition blocks the high permeability streak to divert at least a portion of the aqueous treatment fluid into bypassed regions of the hydrocarbon bearing subterranean formation during the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation; and the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation drives hydrocarbons in the hydrocarbon bearing subterranean formation towards the production well. withdrawing hydrocarbons from a production well extending into the hydrocarbon bearing subterranean formation; identifying a high permeability streak in the hydrocarbon bearing subterranean formation; injecting a dense carbon dioxide composition from an injection well into the high permeability streak of the hydrocarbon bearing subterranean formation, where: the dense carbon dioxide composition comprises dense carbon dioxide and a thickener soluble in the dense carbon dioxide, and the thickener comprises a copolymer, the copolymer being the polymerized reaction product of monomers that include: at least one alkenyl ether or dialkenyl ether monomer; at least one acrylate or methacrylate monomer; at least one structural monomer selected from the group consisting of an acrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, a methacrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, styrene, methyl styrene, phenylpropene, and combinations of these; and at least one allyl ester monomer; and the dense carbon dioxide composition comprises dense carbon dioxide and a thickener soluble in the dense carbon dioxide, and the thickener comprises a copolymer, the copolymer being the polymerized reaction product of monomers that include: at least one alkenyl ether or dialkenyl ether monomer; at least one acrylate or methacrylate monomer; at least one structural monomer selected from the group consisting of an acrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, a methacrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, styrene, methyl styrene, phenylpropene, and combinations of these; and at least one allyl ester monomer; and at least one alkenyl ether or dialkenyl ether monomer; at least one acrylate or methacrylate monomer; at least one structural monomer selected from the group consisting of an acrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, a methacrylic acid long carbon chain ester having a carbon chain length of from 8 carbons to 18 carbons, styrene, methyl styrene, phenylpropene, and combinations of these; and at least one allyl ester monomer; and after injecting the dense carbon dioxide composition into the high permeability streak, injecting an aqueous treatment fluid from the injection well into the hydrocarbon bearing subterranean formation, wherein: the dense carbon dioxide composition blocks the high permeability streak to divert at least a portion of the aqueous treatment fluid into bypassed regions of the hydrocarbon bearing subterranean formation during the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation; and the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation drives hydrocarbons in the hydrocarbon bearing subterranean formation towards the production well. the dense carbon dioxide composition blocks the high permeability streak to divert at least a portion of the aqueous treatment fluid into bypassed regions of the hydrocarbon bearing subterranean formation during the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation; and the injecting of the aqueous treatment fluid into the hydrocarbon bearing subterranean formation drives hydrocarbons in the hydrocarbon bearing subterranean formation towards the production well.