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A reversible emulsion capable of controlling phase transition by salinity, its preparation method and phase transition method

An emulsion and phase transformation technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor stability of emulsions and no research on the phase reversal process of emulsions

Active Publication Date: 2019-03-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emulsion used in the experiment of this paper is an oil-in-water emulsion prepared with SDBS with a mass fraction of 0.4% as an emulsifier, crude oil and water. Experiments have shown that although divalent and trivalent metal salts can cause the emulsion to turn phase, but the stability of the emulsion after phase inversion is poor
In addition, this article did not study the phase inversion process of its emulsion
So far, there is no report on the method of reversible phase reversal of emulsion controlled by salinity

Method used

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  • A reversible emulsion capable of controlling phase transition by salinity, its preparation method and phase transition method
  • A reversible emulsion capable of controlling phase transition by salinity, its preparation method and phase transition method
  • A reversible emulsion capable of controlling phase transition by salinity, its preparation method and phase transition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Embodiment 1, the synthesis of monomer P (St-co-MAn-co-PVBTEAB)

[0093] 1. At room temperature, add 70mmol p-methylstyrene, 60mmol N-bromosuccinimide (NBS), 1mmol lauryl peroxide (LPO) and 100ml carbon tetrachloride ( CCl 4 ), reflux reaction in an oil bath at 60°C for 7h; after the reaction, the succinimide solid was filtered off, and the solvent was spin-dried by a rotary evaporator to obtain p-bromomethylstyrene (PBMS) as a yellow oil.

[0094] At room temperature, add 0.2mol p-bromomethylstyrene (PBMS), 0.2mol triethylamine (TEA) and 100ml tetrahydrofuran (THF) to a 250ml round bottom flask successively, and stir for 20h; after the reaction, filter to obtain a yellow solid product, and washed three times with ether to obtain the salt-sensitive monomer p-vinylbenzyltriethylammonium bromide (PVBTEAB).

[0095] 2. At room temperature, add 30mmol styrene (St), 45mmol maleic anhydride (MA), 5mmol p-vinylbenzyltriethylammonium bromide (PVBTEAB), 1mmol azobisisobutyl N...

Embodiment 2

[0097] Example 2, a reversible emulsion whose salinity can control the phase transition, its preparation and phase transition method

[0098] A reversible emulsion whose phase transition can be controlled by salinity, the composition of the raw materials is as follows:

[0099] Reversible emulsifier 0.18g, Scarland 5# white oil 100mL, deionized water 100mL. Wherein, described reversible emulsifier is formulated by the following components by mass percentage:

[0100] P(St-co-MAn-co-PVBTEAB) 20%,

[0101] Sodium dodecylbenzenesulfonate 30%,

[0102] Sodium Petroleum Sulfonate 32%,

[0103] Potassium salt of perfluoroalkyl ether carboxylate FC-5 18%;

[0104] Preparation method of reversible emulsion:

[0105] Mix 0.18g of reversible emulsifier with 100mL of deionized water, stir with a glass rod until completely dissolved; add 100mL of Scarland 5# white oil, and stir at 12000r / min for 10min to form a milky white O / W emulsion (such as figure 1 , image 3 ), which is the r...

Embodiment 3

[0118] A reversible emulsion whose phase transition can be controlled by salinity, the composition of the raw materials is as follows:

[0119] Reversible emulsifier 0.24g, dehydrated crude oil 110mL, deionized water 90mL. Wherein, described reversible emulsifier is formulated by the following components by mass percentage:

[0120]

[0121] Described reversible emulsion preparation method is as follows:

[0122] Mix 0.24g of reversible emulsifier with 90mL of deionized water, stir with a glass rod until completely dissolved; add 110mL of dehydrated crude oil, and stir for 10min at a speed of 12000r / min to form a milky white O / W emulsion, which is the reversible emulsifier of the present invention. Emulsion, denoted as B1 emulsion.

[0123] The stability test shows that the water separation rate of the B1 emulsion after standing for 5 hours is 9%.

[0124] A phase inversion method of a reversible emulsion that can be controlled by salinity for phase inversion, using the ...

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Abstract

The invention relates to a reversible emulsion for controlling phase transformation through salinity, and a preparation method and a phase transformation method thereof. The reversible emulsion is composed of a reversible emulgator, water and an oil phase, wherein the reversible emulgator is composed of P(St-co-MAn-co-PVBTEAB), sodium dodecyl benzene sulfonate, petroleum sodium sulfonate and perfluoroalkyl ether potassium carboxylate FC-5. The invention also provides the preparation method and the phase transformation method of the reversible emulsion for controlling phase transformation through salinity. The mutual conversion of the emulsion between W / O type and O / W type can be conveniently and quickly controlled by adjusting the concentration of inorganic salt or a reversal agent, and thus the reversible emulsion can meet the requirements of various operation environments while being free from pollution to environment.

Description

technical field [0001] The invention relates to a salinity-controlled reversible emulsion that can realize multiple phase transitions, a preparation method and a phase transition method thereof, and belongs to the field of colloid and interface chemistry. Background technique [0002] Emulsion refers to a dispersion system formed by dispersing one liquid in another immiscible liquid in the form of droplets. It has good physical and chemical properties and is widely used in oilfield construction. The common form of oil and water in the industry. On the one hand, due to the complexity of the oilfield construction process, a single-character working fluid cannot meet the requirements of various working conditions, so it is particularly important to change the nature of the working fluid during the construction process; on the other hand, due to the water-in-oil emulsion and water-in-oil Oil emulsions have great differences in viscosity, conductivity, rheology, etc. By changing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36C09K8/28C09K8/035C08F222/08C08F212/06C08F212/14
CPCC08F222/08C09K8/035C09K8/28C09K8/36C08F212/06C08F212/14
Inventor 王彦玲任金恒刘飞王坤尹子辰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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