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Preparation method of viscoelastic surfactant for development of low-permeability oil reservoir

A surfactant and reservoir development technology, applied in the field of viscoelastic surfactant preparation, can solve the problems of poor temperature resistance, high concentration of surfactant and high cost

Pending Publication Date: 2020-05-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the fracturing of low-permeability reservoirs, the following problems exist in the current use of viscoelastic surfactant fracturing fluids, including high concentration and high cost of surfactants; poor temperature resistance of the system; The imbibition effect is not good, the oil washing efficiency of the system after fracturing is not high, etc.

Method used

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  • Preparation method of viscoelastic surfactant for development of low-permeability oil reservoir
  • Preparation method of viscoelastic surfactant for development of low-permeability oil reservoir

Examples

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preparation example Construction

[0011] (1) Preparation of amidation product

[0012] Add organic acid, 1-methylpiperazine, and sodium fluoride into a four-neck glass bottle equipped with a stirrer, a nitrogen pipe, a drying pipe and a thermometer, raise the temperature and stir until all the raw materials are dissolved. Control the reaction temperature at 120-190°C, react for 3-48 hours, and distill off the volatile components under reduced pressure at 180°C to obtain the product; the mass ratio of organic acid to 1-methylpiperazine is 1:(0.2-1.5) , the mass ratio of 1-methylpiperazine to sodium fluoride is 1:(0.003~0.02);

[0013] (2) Preparation of amphoteric surfactant

[0014] In a four-neck glass bottle equipped with a stirrer, a reflux condenser, a thermometer, and a dropping funnel, add the amidation product, raise the temperature and stir until all the raw materials are dissolved. Gradually raise the temperature, control the reaction temperature at 60-130°C, and react for 0.5-10 hours to obtain the...

specific Embodiment approach

[0028] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0029] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0030] The present invention will be further described below in conjunction with specific examples, but the protection scope of the present invention is not limited thereto.

Embodiment 1

[0032] (1) Preparation of amidation product

[0033] Add 100g of octadecanoic acid, 50g of 1-methylpiperazine, and 0.4g of sodium fluoride into a four-neck glass bottle equipped with a stirrer, a nitrogen pipe, a drying pipe and a thermometer, heat up and stir until all the raw materials are dissolved, and then pass After nitrogen gas for 20 minutes, control the reaction temperature at 170°C, react for 12 hours, and distill the volatile components under reduced pressure at 180°C to obtain the amidation product;

[0034] (2) Preparation of amphoteric surfactant

[0035] In a four-necked glass bottle equipped with a stirrer, a reflux condenser, a thermometer, and a dropping funnel, add 100 g of the amidation product, heat up and stir until all the raw materials are dissolved, and after nitrogen gas is introduced for 20 minutes, add 50 g of propanesulfonic acid successively under stirring After the lactone is completed, the temperature is raised gradually, the reaction temperatu...

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Abstract

The invention relates to a preparation method of a viscoelastic surfactant for development of a low-permeability oil reservoir, and belongs to the technical field of oilfield chemistry. The preparation method comprises the following steps: reacting 1-methylpiperazine with long-chain organic acid to prepare an amidation product; and then, reacting the amidation product with a sulfonation reagent toprepare the ampholytic surfactant. The surfactant has excellent dissolution, temperature resistance and salt resistance; a viscoelastic system can be formed at a low concentration, and an excellent tackifying effect is achieved; and in addition, the surfactant is controllable in adsorption, interfacial tension change, wettability adjustment and other properties, and has a good imbibition oil recovery effect on low-permeability oil reservoirs.

Description

technical field [0001] The invention relates to a preparation method of a viscoelastic surfactant used in the development of low-permeability oil reservoirs, belonging to the technical field of oil field chemistry. Background technique [0002] Petroleum is an important strategic resource, and its exploitation and utilization play an important role in the development of the national economy. my country's low-permeability reservoirs account for 60% of the total domestic petroleum resources, and are the largest petroleum resource category in China. At present, water injection development is the main way of low-permeability development, but the breakthrough of water flooding is fast, the invalid water cycle is serious, and the field application effect is not good. [0003] Hydraulic fracturing is an effective measure to transform low-permeability oil and gas reservoirs and increase oil and gas production and recovery. Fracturing fluid plays the role of transmitting pressure, ...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/86C07D295/185B01F17/18B01F17/02B01F17/32C09K23/02C09K23/18C09K23/32
CPCC09K8/68C09K8/86C07D295/185C09K2208/30C09K23/00
Inventor 冯奇吕开河曹杰米恒坤宁一凡王佳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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