A kind of reservoir wettability improving agent and preparation method thereof

Abstract

The invention discloses an oil reservoir wettability improving agent and a preparation method thereof, which comprises a hydrophilic unsaturated monomer, a nitrogen-containing heterocyclic unsaturated monomer, a hydrophobic unsaturated monomer, a phase transfer agent and a solvent. Reservoir wettability improver. The invention is suitable for low-permeability and extra-low-permeability reservoirs with a temperature of 105°C. It can be used alone or added to existing oil displacement agents in tertiary oil recovery technology. The wettability improving agent is adsorbed on rocks to improve reservoir wetting It can improve the solubilization ability of crude oil, adjust the mobility ratio appropriately, make the reservoir "oil-permeable and water-blocking", improve the efficiency of oil displacement and throughput, and solve the technical oil change ratio of conventional water flooding, polymer flooding, surfactant throughput, etc. Low cost and complex on-site liquid configuration, the oil change ratio in indoor physical model experiments can be increased by 10% to 15%.

Description

Technical field

[0001] The present invention relates to the field of petroleum extraction technology, specifically to a reservoir wettability improver and a preparation method thereof. Background

[0002] After more than 20 years of research and practice, China's chemical flooding technology and scale have ranked at the forefront of the world, and the polymer and surface activator flooding of medium and high permeability reservoirs can improve the oil recovery by 10%. The oil repellent used in the tertiary oil recovery technology mainly includes two categories of polymers and surfactants, using the strong tack-increasing ability of water-soluble polymers to increase the viscosity of the displacement phase in the reservoir, improve the flow ratio, and adjust the formation permeability to achieve the purpose of improving the recovery rate; The ability to reduce the surface tension of aqueous solutions by using surfactants improves the recovery by reducing the tension at the oil-wat...

Examples

Embodiment 1

[0030]In a four-mouth flask equipped with a stirrer, constant pressure drip funnel, the thermometer, and condenser was injected into the nitrogen displacement air, and an appropriate amount of reactants glycerol allyl ether (AG), N-vinylpyrrolidone (NPV), p-methylstyrene (PMS), an appropriate amount of reducing agent sodium benzene sulfonate was added, and an appropriate amount of phase transfer agent propylene glycol phenyl ether was added, wherein the molar ratio of the reactants, reducing agents, and phase transfer agents was n (glyceryl allyl ether): n (N- vinylpyrrolidone): n (p-methylstyrene): n (sodium benzenesulfonate) : n (propylene glycol phenyl ether) = 6:1:1:0.08:2. Solvent deionized water to p-methylstyrene molar ratio of n (deionized water): n (p-methylstyrene) = 87:1, add 70% molar parts of deionized water to the four flasks, stirred at 250 rpm for 30 minutes. Initiator ammonium persulfate to N-vinylpyrrolidone molar ratio of n (ammonium persulfate): n (N-vinylpyrro...

Embodiment 2

[0035]Nitrogen displacement air was introduced in a four-mouth flask equipped with a stirrer, a constant pressure drip funnel, a thermometer, and a condenser, and an appropriate amount of reactants ethylene glycol monoallyl ether (AOE), 2-vinylpyridine (2VP), p-methylstyrene (PMS), an appropriate amount of reducing agent sodium benzene sulfonate was added, and an appropriate amount of phase transfer agent propylene glycol phenyl ether was added, wherein the molar ratio of the reactants, reducing agents, and phase transfer agents was n (ethylene glycol monoallyl ether): n (2-vinylpyridine): n (p-methylstyrene): n (sodium benzenesulfonate) : n (propylene glycol phenyl ether) = 18:2:1:0.2:6. Solvent deionized water to p-methylstyrene molar ratio of n (deionized water): n (p-methylstyrene) = 114:1, add 70% molar parts deionized water to the four-mouth flask, stirred at 250 rpm for 30 minutes. The molar ratio of the initiator ammonium persulfate to p-methylstyrene is n (ammonium persul...

Embodiment 3

[0040]In a four-mouth flask equipped with agitator, constant pressure drip funnel, thermometer, condenser through the nitrogen displacement air, add the appropriate amount of reactants allyl polyoxyethylene methyl ether (HPEG) (n = 10), N- vinyl caprolactam (NVC), styrene (St), add an appropriate amount of reducing agent sodium benzene sulfonate, add an appropriate amount of phase transfer agent propylene glycol phenyl ether, wherein the molar ratio of reactants, reducing agents, phase transfer agents is n (allyl polyoxyethylene methyl ether (n = 10)): n (N- vinyl caprolactam) : n (styrene): n (sodium benzenesulfonate): n (propylene glycol phenyl ether) = 4: 1: 1: 0.06: 2. Solvent deionized water to styrene molar ratio of n (deionized water): n (styrene) = 159:1, add 70% molar parts deionized water to the four flasks, stirred at 250 rpm for 30 minutes. The molar ratio of the initiator ammonium persulfate to styrene is n (ammonium persulfate): n (styrene) = 0.06:1, the ammonium per...

Technical field

[0001] The present invention relates to the field of petroleum extraction technology, specifically to a reservoir wettability improver and a preparation method thereof. Background

[0002] After more than 20 years of research and practice, China's chemical flooding technology and scale have ranked at the forefront of the world, and the polymer and surface activator flooding of medium and high permeability reservoirs can improve the oil recovery by 10%. The oil repellent used in the tertiary oil recovery technology mainly includes two categories of polymers and surfactants, using the strong tack-increasing ability of water-soluble polymers to increase the viscosity of the displacement phase in the reservoir, improve the flow ratio, and adjust the formation permeability to achieve the purpose of improving the recovery rate; The ability to reduce the surface tension of aqueous solutions by using surfactants improves the recovery by reducing the tension at the oil-wat...

Examples

Embodiment 1

[0030]In a four-mouth flask equipped with a stirrer, constant pressure drip funnel, the thermometer, and condenser was injected into the nitrogen displacement air, and an appropriate amount of reactants glycerol allyl ether (AG), N-vinylpyrrolidone (NPV), p-methylstyrene (PMS), an appropriate amount of reducing agent sodium benzene sulfonate was added, and an appropriate amount of phase transfer agent propylene glycol phenyl ether was added, wherein the molar ratio of the reactants, reducing agents, and phase transfer agents was n (glyceryl allyl ether): n (N- vinylpyrrolidone): n (p-methylstyrene): n (sodium benzenesulfonate) : n (propylene glycol phenyl ether) = 6:1:1:0.08:2. Solvent deionized water to p-methylstyrene molar ratio of n (deionized water): n (p-methylstyrene) = 87:1, add 70% molar parts of deionized water to the four flasks, stirred at 250 rpm for 30 minutes. Initiator ammonium persulfate to N-vinylpyrrolidone molar ratio of n (ammonium persulfate): n (N-vinylpyrro...

Embodiment 2

[0035]Nitrogen displacement air was introduced in a four-mouth flask equipped with a stirrer, a constant pressure drip funnel, a thermometer, and a condenser, and an appropriate amount of reactants ethylene glycol monoallyl ether (AOE), 2-vinylpyridine (2VP), p-methylstyrene (PMS), an appropriate amount of reducing agent sodium benzene sulfonate was added, and an appropriate amount of phase transfer agent propylene glycol phenyl ether was added, wherein the molar ratio of the reactants, reducing agents, and phase transfer agents was n (ethylene glycol monoallyl ether): n (2-vinylpyridine): n (p-methylstyrene): n (sodium benzenesulfonate) : n (propylene glycol phenyl ether) = 18:2:1:0.2:6. Solvent deionized water to p-methylstyrene molar ratio of n (deionized water): n (p-methylstyrene) = 114:1, add 70% molar parts deionized water to the four-mouth flask, stirred at 250 rpm for 30 minutes. The molar ratio of the initiator ammonium persulfate to p-methylstyrene is n (ammonium persul...

Embodiment 3

[0040]In a four-mouth flask equipped with agitator, constant pressure drip funnel, thermometer, condenser through the nitrogen displacement air, add the appropriate amount of reactants allyl polyoxyethylene methyl ether (HPEG) (n = 10), N- vinyl caprolactam (NVC), styrene (St), add an appropriate amount of reducing agent sodium benzene sulfonate, add an appropriate amount of phase transfer agent propylene glycol phenyl ether, wherein the molar ratio of reactants, reducing agents, phase transfer agents is n (allyl polyoxyethylene methyl ether (n = 10)): n (N- vinyl caprolactam) : n (styrene): n (sodium benzenesulfonate): n (propylene glycol phenyl ether) = 4: 1: 1: 0.06: 2. Solvent deionized water to styrene molar ratio of n (deionized water): n (styrene) = 159:1, add 70% molar parts deionized water to the four flasks, stirred at 250 rpm for 30 minutes. The molar ratio of the initiator ammonium persulfate to styrene is n (ammonium persulfate): n (styrene) = 0.06:1, the ammonium per...

Images