Surfactant for development of low-permeability oil reservoir and preparation method of surfactant

A low-permeability, catalyst technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problems of poor stability, adsorption, precipitation, chromatographic separation, etc., and achieve the effects of low production cost, good dissolution, and convenient adjustment

Active Publication Date: 2020-02-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In comparison, the anion/nonionic surfactant compound system has a better imbibition effect, however, the simple compound system has poor

Method used

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  • Surfactant for development of low-permeability oil reservoir and preparation method of surfactant
  • Surfactant for development of low-permeability oil reservoir and preparation method of surfactant
  • Surfactant for development of low-permeability oil reservoir and preparation method of surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Preparation of amidation product

[0060] Add 120g palmitic acid, 100g 1-(4-hydroxyphenyl)piperazine, and 0.9g sodium fluoride into a four-necked glass bottle equipped with a stirrer, nitrogen pipe, drying pipe and thermometer, heat up and stir until all The raw materials were dissolved, and nitrogen gas was introduced for 20 minutes, the reaction temperature was controlled at 170°C, the reaction was carried out for 12 hours, and the volatile components were removed by distillation under reduced pressure at 180°C to obtain the amidation product shown in formula IV;

[0061]

[0062] In the formula IV, R is C 15 h 31 ;

[0063] (2) Preparation of polyoxyethylene segment product shown in formula III

[0064] Add 150g of the amidation product and 0.6g of potassium hydroxide into the autoclave, seal it and vacuumize to -0.1MPa while raising the temperature, continue vacuuming to 100°C, add 100g of ethylene oxide, control the reaction temperature at 120°C, and the ...

Embodiment 2

[0078] As described in Example 1, the difference is that the organic acid is capric acid in the step (1), and the addition amount is 135g.

Embodiment 3

[0080] As described in Example 1, the difference is that the organic acid in step (1) is behenic acid.

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Abstract

The invention discloses a surfactant for development of a low-permeability oil reservoir and a preparation method of the surfactant. The preparation method comprises the following steps: reacting 1-(4-hydroxyphenyl)piperazine with organic acid to prepare an amidation product; reacting an amidation product with ethylene oxide and propylene oxide in sequence to prepare a nonionic product containingpolyoxyethylene and polyoxypropylene chain segments; and finally, sulfonating the non-ionic product through fuming sulfuric acid to prepare the anionic/non-ionic surfactant. The surfactant has excellent dissolving, temperature-resistant and salt-resistant properties, the adsorption, interfacial tension change, wettability adjustment and other properties of the surfactant are controllable, and theself-imbibition recovery ratio of the low-permeability oil reservoir can be remarkably increased.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and relates to a surfactant used in the development of low-permeability oil reservoirs and a preparation method thereof. Background technique [0002] The development of low-permeability and ultra-low-permeability oilfield reserves has become an important potential for the stable development of my country's petroleum industry and the protection of national petroleum security, and it is also the main research direction for the sustainable development of the petroleum industry. Low-permeability oil and gas resources are rich in international reserves. In 2013, the U.S. Department of Energy estimated that the technically recoverable volume of global ultra-low-permeability oil and gas resources (shale oil / tight oil) was 48.3 billion tons, and the U.S. low-permeability crude oil production has reached 51 %. my country's low-permeability resources are also widely distributed and abundant, with about ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588C07D295/185E21B43/22
CPCC07D295/185C09K8/584C09K8/588E21B43/16
Inventor 王姗姗张健康晓东王秀军冯奇杨光朱玥珺未志杰赵娟李保振
Owner CHINA NAT OFFSHORE OIL CORP
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