Water-soluble hydrophobic associated polymer oil displacement agent and synthesis method thereof

A technology of hydrophobic association and synthesis method, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve the problems of reducing the control degree of polymer flooding, low retention rate of polymer solution viscosity, and decrease of solution viscosity. To achieve the effect of increasing the simulated oil recovery rate, enhancing the promotion and application value, and improving the expansion of the swept volume

Inactive Publication Date: 2013-01-02
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] The present invention provides a water-soluble hydrophobic association polymer oil displacement agent and its synthesis method, aiming to solve the problem that the hydrophobic association polymer provided by the prior art has poor long-term stability and is hydrolyzed at high temperature. The viscosity retention rate of polymer solution is low, and the viscosity drops rapidly, which reduces the actual control degree of polymer flooding and seriously affects the application effect of polymer flooding technology. Due to poor temperature resistance, under high temperature conditions, This kind of polymer will undergo obvious thermo-oxidative degradation and hydrolysis, which will reduce the viscosity of the solution and make the oil displacement effect worse. Viscosity will drop significantly, and even precipitate, which will affect the scope of use of HAWP

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  • Water-soluble hydrophobic associated polymer oil displacement agent and synthesis method thereof
  • Water-soluble hydrophobic associated polymer oil displacement agent and synthesis method thereof
  • Water-soluble hydrophobic associated polymer oil displacement agent and synthesis method thereof

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preparation example Construction

[0066] Another object of the present invention is to provide a kind of synthetic method of water-soluble hydrophobic association polymer oil displacement agent, and this synthetic method comprises the following steps:

[0067] Step 1, using oleic acid, phosphorus trichloride, dichloromethane, diallylamine, dichloromethane, triethylamine and hydroquinone to prepare monomer N, N-diallyl oleimide DNDA ;

[0068] Step 2, prepare AM / AA / DNDA terpolymer by copolymerization of acrylamide AM, acrylic acid AA, N,N-diallyl oleimide DNDA;

[0069] Step 3: Use formaldehyde and sodium bisulfite as sulfonating agents to sulfonate the AM / AA / DNDA ternary polymer to obtain a water-soluble hydrophobic association polymer oil displacement agent.

[0070] In the embodiment of the present invention, in step 1, oleic acid, phosphorus trichloride, dichloromethane, diallylamine, dichloromethane, triethylamine and hydroquinone are used to prepare the monomer N,N-dichloro The specific steps of allyl o...

Embodiment 1

[0097] Embodiment 1: the preparation of DNDA monomer

[0098] 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 in a yield of 99.0%. Dilute 2.46 g of the 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, 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, react at room tempe...

Embodiment 2

[0099] Embodiment 2: the synthesis of terpolymer AM / AA / DNDA

[0100] 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 AA solution, adjust the pH of the system to 8 with NaOH solution, and pass nitrogen for 20 minutes; then add the initiator sodium bisulfite and ammonium persulfate solution, continue The AM / AA / DNDA ternary polymer was prepared by blowing nitrogen gas for 10 minutes, reacting at a constant temperature of 40°C for 12 hours, washing with absolute ethanol, and drying at a constant temperature of 40°C after precipitation and pulverization.

[0101] Table 1 Addition amount of ternary polymer synthetic drugs

[0102] name

[0103] DNDA

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Abstract

The invention discloses a water-soluble hydrophobic associated polymer oil displacement agent and a synthesis method thereof. The synthesis method includes: copolymerizing, by mass, 53.5-59.9% of AM (acrylamide), 40-45% of AA (acrylic acid) and 0.1-1.5% of DNDA (N, N-diallyl oil imide), and then, performing sulfonated modification for terpolymers by using formaldehyde and sodium bisulfite as sulfonating agents, wherein the components in sulfonation include, by mass, 90.0-95.0% of the AM/AA/DNDA terpolymers and 5.0-10.0% of the sulfonating agents composed of the sodium bisulfite and the formaldehyde, and the ratio of the sodium bisulfite to the formaldehyde is 2:1-5:1. The polymer oil displacement agent is good in temperature resistance and salt tolerance and is capable of achieving better fluidity control capability, reducing water-phase permeability, improving polymer solution swept volume expanding capability and effectively increasing simulated oil recovery ratio.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a water-soluble hydrophobic association polymer oil displacement agent and a synthesis method thereof. Background technique [0002] Hydrophobic association polymer (HAWP) is a polymer synthesized by hydrophobic modification, which can improve the shear resistance, temperature resistance and salt resistance of polyacrylamide, and it has become an effective method for enhancing oil recovery when used in tertiary oil recovery. An oil repellent. [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 protein (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 Sci 1951, 6: 649-659.). In the 1980s, Landoll's research on the hydrophobic modification of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/52C08F8/36C09K8/588
Inventor 赖南君覃孝平叶仲斌张雪苟绍华周利华舒政陈洪
Owner SOUTHWEST PETROLEUM UNIV
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