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Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and synthesis method thereof

A hydrophobic association and polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the application range of HAWP, produce precipitation, and reduce viscosity, and achieve enhanced oil recovery and viscosity increase. , the effect of enhancing rigidity

Inactive Publication Date: 2013-10-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In reservoirs with high salinity, especially those with high content of high-valent metal ions, the viscosity will drop significantly, and even precipitate, which affects the application range of HAWP

Method used

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  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and synthesis method thereof
  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and synthesis method thereof
  • Hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the preparation of DNDA monomer

[0024] Add 42.3g of oleic acid into the reactor, slowly add 10.2g of phosphorus trichloride under stirring, the feeding temperature is controlled at 10-15°C, after the addition is completed, the temperature is raised to 55°C, and the lower layer and the upper layer are separated after 4 hours of heat preservation reaction. Unreacted phosphorus trichloride was removed by evaporation to obtain oleoyl chloride with a yield of 99.0%. Dilute 12.46 g of oleoyl chloride obtained in the previous step with a dichloromethane solvent and put it into a constant pressure dropping funnel for use, then add 3.63 g of diallylamine to a 250 ml dry three-necked flask, dilute with a dichloromethane solvent, and then Add 3.79 g of triethylamine and 0.02 g of hydroquinone, and slowly add the oleoyl chloride solution to be used dropwise in an ice-water bath with constant stirring, and control the dropping for 1 hour. After dripping, it was reac...

Embodiment 2

[0025] Embodiment 2: the synthesis of terpolymer AM / NaAA / DNDA

[0026] According to the ratio in Table 1, first weigh acrylic acid and dilute it with 10g of deionized water, slowly add NaOH in an ice-water bath, and cool to room temperature; add the DNDA monomer prepared above into a 250ml three-necked flask, and then add OP-10 to emulsify and 10g of deionized water, stir well until the emulsification is complete, add AM, then add sodium acrylate solution, adjust the pH of the system to 8 with NaOH solution, and pass nitrogen for 20 minutes; then add initiator sodium bisulfite and ammonium persulfate solution, Continue to pass N 2 After reacting for 10 minutes at a constant temperature of 40°C for 12h, washing with absolute ethanol, precipitation and crushing, and drying at a constant temperature of 40°C, the AM / NaAA / DNDA ternary polymer was prepared.

[0027] Table 1 Addition amount of ternary polymer synthetic drugs

[0028]

[0029]

Embodiment 3

[0030] Embodiment 3: AM / NaAA / DNDA terpolymer structure characterization

[0031] The infrared spectrogram of the ternary polymer AM / NaAA / DNDA synthesized by embodiment 2 is as follows figure 1 shown. It is known from the figure that -C(O)NH 2 The stretching vibration peaks are at 3436.53cm -1 , the -C=O stretching vibration peak is at 1654.62cm -1 .

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Abstract

The invention relates to a hydrophobically associating water-soluble polymer (HAWSP) oil displacement agent applied to oil displacement of an oil reservoir and capable of increasing a crude oil recovery ratio and a synthesis method thereof. The HAWSP oil displacement agent has water solubility, improves solution viscosity and has high temperature tolerance, salt tolerance and shearing resistance. The technical scheme is that: the oil displacement agent is terpolymer consisting of 53.5 to 59.9 mass percent of acrylamide (AM), 40 to 45 mass percent of sodium acrylate (NaAA) and 0.1 to 1.5 mass percent of N,N-diallyl oleoyl imine (DNDA). The synthesis method comprises the following steps of: adding the prepared DNDA into a flask; adding an OP-10 emulsifying agent and water; adding the AM, acrylic acid and NaOH after stirring and emulsifying to prepare 10 to 25 percent solution; adjusting the pH value to 7.5 to 11; introducing N2 for 20 minutes; adding an initiator; introducing N2 for 10 to 20 minutes again; reacting at the temperature of between 30 and 70 DEG C for 4 to 12 hours; and washing, crushing and drying to prepare the AM / NaAA / DNDA polymer. The polymer has high temperature tolerance and salt tolerance, can better increase the crude oil recovery ratio, and is applied to the oil displacement of the oil reservoir in an oil field.

Description

technical field [0001] The invention relates to a water-soluble hydrophobic association polymer oil-displacing agent used for oil-displacement of oil reservoirs to enhance oil recovery and a synthesis method thereof. Background technique [0002] Hydrophobic association water-soluble polymer (HAWP) is a polymer synthesized by hydrophobic modification, which can improve the shear resistance, salt resistance, and temperature resistance of polyacrylamide, and it has become an effective way to enhance oil recovery when used in tertiary oil recovery. An effective oil repellant. [0003] In foreign countries, as early as 1951, Strauss reported a series of polysoap and hypercoil (Hypercoil) HAWP and used to simulate the solution behavior of proteins (Strauss U P, Jackson E G. Polysoaps I. Viscosity and solu-bilization studies on ann -dodecyl bromide addition com-pound of poly-2-vinylpyridine[J].Polym Sci1951,6:649-659.). In the 1980s, Landoll's research on the hydrophobic modific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/70C09K8/588
Inventor 叶仲斌董婉苟绍华封明明赖南君
Owner SOUTHWEST PETROLEUM UNIV
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