A kind of fluorine-containing surfactant compound and its preparation method and application

A technology of surfactants and compounds, which is applied in the petrochemical field to improve the recovery of shale gas, can solve the problems of easy plugging of porous media in reservoirs, difficult biodegradation of polymers, and reduced permeability of reservoirs, etc. The effect is good, the operation is simple, and it is beneficial to the effect of on-site promotion

Active Publication Date: 2021-01-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the fluorocarbon surfactants that can be used in the market to change the wettability of reservoirs during oil and gas field development are polymer types (such as CN101449026), and this type of fluorocarbon surfactants has a large relative molecular weight and is easy to block Reservoir porous media reduces reservoir permeability, especially for low-permeability reservoirs, and high polymers are difficult to biodegrade, causing environmental pollution to the formation

Method used

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  • A kind of fluorine-containing surfactant compound and its preparation method and application
  • A kind of fluorine-containing surfactant compound and its preparation method and application
  • A kind of fluorine-containing surfactant compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A kind of preparation of fluorine-containing surfactant compound, the steps are as follows:

[0069] (1) Take 138g (1.2mol) of n-heptylamine and 4.8g (0.06mol) of pyridine in a round-bottomed flask equipped with a magnet, use absolute ethanol as a solvent, and slowly drop it with a constant pressure dropping funnel under an ice bath Add 259 g (0.6 mol) of perfluorooctanoyl chloride, after the dropwise addition is complete, react for 2 hours and then raise the temperature to 75°C, react in an oil bath for 8 hours, filter with suction, remove the solvent, and dry to obtain the compound of formula II.

[0070] (2) Take 153g (0.3mol) of the compound of formula II prepared in step (1) in a round-bottomed flask equipped with a magnet, use an appropriate amount of acetone as a solvent, heat up to 55°C, and after dissolving, drop the liquid with a constant pressure Slowly drop 49.2 g (0.3 mol) of chloroheptanoic acid into the funnel, after the dropwise addition, react in oil fo...

Embodiment 2

[0076] The preparation of the fluorine-containing surfactant is as described in Example 1, the difference is: the prepared fluorine-containing surfactant is added with deionized water to make a 0.7% solution, soak the rock core with it for 48 hours, place it at room temperature after drying 8 hours, measured the contact angle of water phase and oil phase on the core surface after treatment, and its water phase contact angle was 125 ° (as image 3 shown), the oil phase contact angle is 95° (as Figure 10 shown).

Embodiment 3

[0078] The preparation of the fluorine-containing surfactant is as described in Example 1, the difference is: the prepared fluorine-containing surfactant is added with deionized water to make a 1.0% solution, soak the rock core with it for 48 hours, place it at room temperature after drying 8 hours, measured the contact angle of water phase and oil phase on the rock core surface after treatment, and its water phase contact angle was 128 ° (as Figure 4 shown), the oil phase contact angle is 108° (as Figure 11 shown).

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Abstract

The invention relates to a fluorine-containing surfactant compound, its preparation method and application. The fluorine-containing surfactant has the structure shown in formula I. The preparation method includes: (1) reacting perfluorooctanoyl chloride compound with n-heptylamine to obtain compound of formula II, (2) reacting compound of formula II with chloroheptanoic acid compound to obtain compound of formula III, (3) reacting compound of formula III with alkali to prepare A compound of formula I is obtained as a fluorine-containing surfactant. The fluorine-containing surfactant of the present invention has good hydrophobic and oleophobic properties, and can obviously reverse the reservoir from liquid-wet to gas-wet, so as to keep the fracture surface clean and reduce the adsorption of wellbore working fluid on the surface of the formation, especially at low In the narrow gaps and pore roars of the seepage reservoir, the fluidity of the fluid can be obviously improved, so as to achieve the purpose of increasing production.

Description

technical field [0001] The invention relates to a fluorine-containing surfactant for changing the surface wettability of shale reservoirs, a preparation method and application thereof, and belongs to the petrochemical technical field of improving shale gas recovery. [0002] technical background [0003] Surfactant refers to a class of substances that can significantly reduce the surface tension of solvents at very low concentrations. Its molecular structure has a common feature, that is, its molecules are composed of two parts: a non-polar hydrophobic group and a polar hydrophilic group. Molecular fragments or groups with diametrically opposite structures and properties are located at both ends of the same molecule and are connected by chemical bonds to form an asymmetric and polar structure. Therefore, such substances are both hydrophilic and lipophilic, but they are not overall hydrophilic or lipophilic. It can play a series of functions such as emulsification, dispersio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C241/04B01F17/22B01F17/28C07C243/28C09K8/584C09K23/22C09K23/28
Inventor 王彦玲李永飞梁雷白宝君汤龙浩孟令韬兰金城蒋保洋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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