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Multifunctional polymer oil displacing agent and preparation method and application thereof

An oil-displacing agent and polymer technology are applied in the field of multifunctional polymer oil-displacing agent and its preparation, which can solve the problems of weakening oil-displacing effect, difficulty in forming oil-displacing slug, and reducing effective viscosity, and achieving good oil-displacing performance , The effect of long validity period and high profile control strength

Inactive Publication Date: 2018-07-31
XINJIANG HUAYOU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the polymer is degraded by machinery, perforation throat and formation shear during the injection process, the effective viscosity decreases, and it is difficult to form an effective oil displacement slug, which weakens the oil displacement effect

Method used

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  • Multifunctional polymer oil displacing agent and preparation method and application thereof
  • Multifunctional polymer oil displacing agent and preparation method and application thereof
  • Multifunctional polymer oil displacing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of multifunctional polymerization oil displacement agent of the present invention is:

[0038] Dissolve a certain amount of emulsifier OP-10 and hydrophobic monomer FM in deionized water, pour it into a three-necked flask, pass nitrogen to drive oxygen for 30 minutes; stir to raise the temperature, add AM, DMC, AMPS and ammonia water, and then add initiator K 2 S 2 o 8 Initiate polymerization, the reaction temperature is 50°C, and the copolymerization reaction time is 8h (without stirring), to obtain a colloidal copolymer (FPAM), which is precipitated with absolute ethanol and washed 3 times, and the precipitate is dried in a vacuum oven (80°C) , and then put it in a desiccator for later use. Table 1 is the specific formulation of the multifunctional polymer oil displacement agent of the present invention.

[0039] Table 1

[0040]

[0041] Comprehensively comparing the above experiments, the performance of the multifunctional polymer oil d...

Embodiment 2

[0042] Example 2 Viscosity-increasing performance evaluation of the multifunctional polymeric oil displacement agent of the present invention

[0043] We put the multifunctional polymer oil displacing agents prepared by formula 4 with concentrations of 1500mg / l and 2500mg / l in a constant temperature water bath at 50°C, and recorded the relationship curve of the viscosity of the oil displacing agent solution with time every day. Experimental results such as figure 1 shown.

[0044] Depend on figure 1 It can be seen that when the concentration of the multifunctional polymeric oil displacement agent is 1500mg / l and 2500mg / l, the viscosity of the multifunctional polymeric oil displacement agent changes with time, and the viscosity does not change much, indicating that the oil displacement agent solution has better stability , will not degrade in the formation.

Embodiment 3

[0045] Example 3 Evaluation of the salt resistance performance of the multifunctional polymeric oil displacement agent of the present invention

[0046] With w (NaCl) is respectively 0, 3%, 6%, 9%, 12% brine with the multifunctional polymer oil displacement agent of the present invention prepared by application formula 4 and unmodified hydrolyzed polyacrylamide (HPAM ) were prepared into aqueous solutions, and the mass fractions of multifunctional polymer oil displacement agent and hydrolyzed polyacrylamide were both 0.1%. After dissolving for 2 hours, at a temperature of 20°C and a shear rate of 1850s -1 The apparent viscosity was measured as follows, the results can be found in figure 2 .

[0047] From figure 2It can be seen that with the increase of brine content, the apparent viscosity of unmodified HPAM shows a downward trend, especially when w(NaCl) is in the range of 6% to 9%, the apparent viscosity drops rapidly. When w(NaCl) is 9% %, the apparent viscosity drops...

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Abstract

The invention provides a preparation method of a multifunctional polymer oil displacing agent, and the method is as follows: using 2-(Perfluorooctyl) Ethyl Acrylate as a hydrophobic monomer, adding anemulsifier, an initiator and water, adding acrylamide, 2-Acrylamide-2-methylpropanesulfonic acid and Methacrylatoethyl trimethyl ammonium chloride to together form a solution, and preparing the multifunctional polymer oil displacing agent by free radical micellar copolymerization. The invention also provides the oil displacing agent prepared by the method and application thereof. The multifunctional polymer oil displacing agent can be used as a multifunctional polymer for integration of profile control of a water injection well of an oilfield, oil washing and oil displacement of an oil layerand viscosity reduction of crude oil. The multifunctional polymer oil displacing agent has strong intermolecular hydrophobic association in an aqueous solution, and has salt resistance, shear resistance and high temperature resistance. The preparation process is simple, the profile control intensity is high, the effective period is long, and the oil displacement performance is good.

Description

technical field [0001] The invention relates to a tertiary oil recovery process for an oil well in an oil field area, in particular to a multifunctional polymer oil displacement agent used in an oil field to enhance oil recovery and its preparation method and application. Background technique [0002] Most domestic oil fields are already in the high water-cut development period. The total recovery degree of most domestic oilfields does not exceed 30%, and the total amount of remaining oil resources in the reservoir is very large. Therefore, it is urgent to explore new methods to improve water flooding effect and enhance oil recovery in high water cut oilfields. At present, the polymer flooding technology widely used in Daqing, Shengli, Dagang and other oilfields has improved the effect of water flooding and enhanced oil recovery. However, because the polymer is degraded by the shear of machinery, perforation throat and formation during the injection process, the effective ...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/34C08F220/24C08F220/56C09K8/588
CPCC08F220/34C08F220/58C08F220/585C09K8/588C08F220/24C08F220/56
Inventor 纪振云周洋
Owner XINJIANG HUAYOU TECH SERVICE
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