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Temperature-resistant and salt-resistant polymer oil displacement agent and preparation method thereof

A technology of oil displacement agent and polymer, which is applied in the field of temperature-resistant and salt-resistant polymer oil displacement agent and its preparation, which can solve the problems of temperature resistance, salt resistance, poor performance, poor viscosity increasing performance, shear thinning, etc. problems, to achieve the effect of improving salt resistance, poor salt sensitivity, and good viscosity increasing

Active Publication Date: 2017-07-11
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyacrylamide is an existing widely used polymer oil displacement agent, but this type of polymer has the disadvantages of shear thinning, pyrolysis, and viscosity reduction when encountering salt, and the temperature in the deep oil well in the tertiary oil recovery stage Higher; and phase separation is prone to occur in oil layers with higher salinity, resulting in a sharp drop in solution viscosity, therefore, its viscosity-increasing performance is poor, and its temperature resistance, salt resistance, and use performance are not good.

Method used

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  • Temperature-resistant and salt-resistant polymer oil displacement agent and preparation method thereof
  • Temperature-resistant and salt-resistant polymer oil displacement agent and preparation method thereof
  • Temperature-resistant and salt-resistant polymer oil displacement agent and preparation method thereof

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Embodiment 1

[0034] Effects of the weight ratio of polymerized monomers on the viscosity and temperature and salt resistance of oil displacement agent aqueous solution

[0035] Different monomer ratios will have different synergistic effects among their functional groups, which will affect the viscosity and temperature and salt resistance of the synthesized polymer oil displacement agent aqueous solution. A single factor method was used to study the effects of different ratios of monomers on the viscosity and temperature and salt resistance of oil displacement agent solutions, in which the monomers were acrylamide (AM) and allyl polyethylene glycol (APEG-700) respectively. , Sodium styrene sulfonate (SSS), dimethyl allyl octadecyl ammonium chloride (C-18), the monomer total mass concentration is 20% during the reaction, and the initiator is accounted for 20% of the total monomer mass 0.3%, the initiator consists of NaHSO in a weight ratio of 2:1 3 and (NH 4 ) 2 S 2 O 8 Composition, th...

Embodiment 2

[0040] Effect of Reaction Temperature on Viscosity and Temperature and Salt Resistance of Oil Displacing Agent Aqueous Solution

[0041] The higher the reaction temperature is, the energy of the system will increase accordingly, the reaction polymerization rate will be accelerated, and the viscosity-increasing effect will be more significant, but as the reaction temperature continues to rise, the polymerization reaction will be too violent, forcing the chain termination to occur earlier, thus affecting The apparent viscosity of the polymer and its resistance to temperature and salt. Using the single factor method, under the condition that the fixed monomer ratio is n(AM):n(APEG-700):n(SSS):n(C-18)=97:1.7:0.3:1, during the reaction The total mass concentration of the monomer is 20%, the initiator is 0.3% of the total mass of the monomer, and the initiator is composed of NaHSO with a weight ratio of 2:1 3 and (NH 4 ) 2 S 2 O 8 Composition, the reaction time is 9 hours, chan...

Embodiment 3

[0046] Effects of Initiator Addition on Viscosity and Temperature and Salt Resistance of Oil Displacing Agent Aqueous Solution

[0047] When the amount of the initiator added is small, the polymerization reaction occurs slowly and cannot effectively increase the viscosity. However, if the amount of the initiator added is large, the synthesis reaction of the polymer will be intensified, and the polymer chain will be terminated in advance, thus affecting The apparent viscosity of the polymer and its resistance to temperature and salt. Using the single factor method, under the condition that the fixed monomer ratio is n(AM):n(APEG-700):n(SSS):n(C-18)=97:1.7:0.3:1, during the reaction The total mass concentration of monomers is 20%, and the initiator consists of NaHSO with a weight ratio of 2:1 3 and (NH 4 ) 2 S 2 O 8 Composition, the reaction temperature is 45°C, and the reaction time is 9 hours. Change the dosage of the initiator according to Table 3, configure the syntheti...

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Abstract

The present invention discloses a temperature-resistant and salt-resistant polymer oil displacement agent and a preparation method thereof, wherein the temperature-resistant and salt-resistant polymer oil displacement agent is formed by polymerizing acrylamide, allyl polyethylene glycol, sodium p-styrene sulfonate, and dimethyl allyl octadecylammonium chloride according to a molar ratio of (94-97):(1.7-4.7):(0.3-1.0):(0.3-1.0). According to the present invention, the polymer oil displacement agent can maintain good tackifying effect at a high temperature in a salt solution having a certain concentration, and has characteristics of good temperature resistance, good salt resistance, good shear resistance, low raw material monomer cost, mild polymerization reaction condition, and simple process.

Description

technical field [0001] The invention relates to the technical field of oil-displacement agents, in particular to a temperature-resistant and salt-resistant polymer oil-displacement agent and a preparation method thereof. Background technique [0002] Petroleum is known as "industrial blood" and is an important strategic resource of a country. Petroleum is a non-renewable energy source, and its exploitation and reserves are closely related to the country's economic development. The oil well development process can be divided into three stages: primary oil recovery, secondary oil recovery and tertiary oil recovery. Primary oil recovery, that is, self-spraying, is to use the natural ability of the reservoir itself to extract a part of the oil, and the recovery rate is 5% to 20%; secondary oil recovery is water injection and gas injection, and the recovery rate can reach 20% ~40%; tertiary oil recovery, such as chemical and miscible flooding, etc., the recovery rate can basica...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F283/06C08F220/56C08F212/14C08F226/02
CPCC08F283/065C09K8/588C09K8/885C08F220/56C08F212/14C08F226/02C08F2500/01
Inventor 全红平蒋思龙胡钰灵邢浪漫段文猛王金玉康慧
Owner SOUTHWEST PETROLEUM UNIV
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