CN-119875132-B - Condensate nano demulsifier and preparation method and application thereof

Abstract

The invention provides a condensate oil nano demulsifier and a preparation method and application thereof, wherein the preparation method comprises the following steps of S1, adding 1, 3-propylene diamine and methyl acrylate into an ethanol solution containing sodium ethoxide for reaction to obtain a prepolymer; S2, adding nano silicon dioxide and a coupling agent into an ethanol solution, regulating pH, and reacting to obtain a modified body, and S3, adding the obtained prepolymer and the modified body into the ethanol solution containing sodium ethoxide, and reacting to obtain the condensate oil nano demulsifier. The condensate oil nanometer demulsifier is a polymer with a space network structure taking nanometer silicon dioxide as a core connection point, and the size of a repeating unit structure is 100-200 nm. The condensate oil nanometer demulsifier provided by the invention has excellent performance and good demulsification effect on condensate oil emulsion, and can obviously improve the oil-water separation efficiency of the condensate oil emulsion.

Inventors

• LIANG LEI
• YE HAIFENG
• WEN TAO
• XIN JUN
• SU CHAO
• WEI LEI
• GU CONGYUE
• ZHAO WEI
• Xiong yujia
• XIAO QINGHUA

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团川庆钻探工程有限公司

Dates

Publication Date

20260508

Application Date

20231025

Claims (6)

1. 1. The preparation method of the condensate nano demulsifier is characterized by comprising the following steps of: S1, adding 1, 3-propylene diamine and methyl acrylate into an ethanol solution containing sodium ethoxide, and reacting to obtain a prepolymer, wherein in the step S1, the ratio of the 1, 3-propylene diamine to the ethanol is 1 (0.1-2) mol/L, the molar ratio of the 1, 3-propylene diamine to the methyl acrylate is 1 (1-8), and in the step S1, the ratio of the sodium ethoxide to the ethanol is 1 (0.1-2) g/L; S2, adding nano silicon dioxide and a coupling agent into an ethanol solution, regulating the pH value to be 1-7, and reacting to obtain a modified body, wherein in the step S2, the ratio of the nano silicon dioxide to the ethanol is 1 (0.01-0.1) g/L, the mass ratio of the nano silicon dioxide to the coupling agent is 1 (0.05-0.2), and the nano silicon dioxide is hydrophilic nano silicon dioxide with the particle size of 5-20 nm; s3, adding the prepolymer and the modifier into an ethanol solution containing sodium ethoxide, and reacting to obtain a condensate oil nanoemulsion, wherein in the step S3, the ratio of sodium ethoxide to ethanol in the ethanol solution containing sodium ethoxide is 1 (0.1-2) g/L; The condensate oil nanometer demulsifier is a polymer with a space network structure taking nanometer silicon dioxide as a core connection point, and the size of a repeating unit structure of the condensate oil nanometer demulsifier is 100-200 nm.
2. 2. The method for preparing the condensate nano demulsifier according to claim 1, wherein in the step S1, the reaction temperature is 50-90 ℃ and the reaction time is 4-12 hours, in the step S2, the reaction temperature is 40-80 ℃ and the reaction time is 1-4 hours, and in the step S3, the reaction temperature is 60-120 ℃ and the reaction time is 4-24 hours.
3. 3. The method for preparing a condensate oil nanoemulsion according to claim 1, wherein the coupling agent comprises at least one of vinyltriethoxysilane, vinyltrimethoxysilane, methacryloxypropyl trimethoxysilane, 3-aminopropyl triethoxysilane, or N-2-aminoethyl-3-aminopropyl trimethoxysilane.
4. 4. The method of claim 1, wherein the agent for adjusting pH comprises hydrochloric acid.
5. 5. A condensate nanoemulsion, characterized in that the condensate nanoemulsion is prepared by the method for preparing a condensate nanoemulsion according to any one of claims 1-4.
6. 6. The use of the condensate nanoemulsion of claim 5 in the demulsification of condensate emulsions.

Description

Condensate nano demulsifier and preparation method and application thereof Technical Field The invention relates to the technical field of oil and gas field development and oil and gas field application chemistry, in particular to a condensate nano demulsifier and a preparation method and application thereof. Background In the process of exploiting condensate oil from a gas well, various measures can inject a large amount of surface active liquid into the gas well, so that the well liquid and the condensate oil form a complex emulsion system, and the emulsion breaking of the condensate oil emulsion becomes very difficult. This not only affects the yield and quality of condensate, but also brings serious challenges to the normal operation of the purification plant and production of the gas field. The prior art of demulsifiers is mostly based on conventional crude oil demulsification, for example Zhang Lifeng et al discloses a hyperbranched polyglycidyl methacrylate as a demulsifier for O/W type emulsion (refer to: zhang Lifeng, zhan Ningning, qin Lijuan, etc. hyperbranched polyglycidyl methacrylate as a demulsifier for O/W type emulsion [ J ]. Chemical progress, 2021,40 (06): 3434-3443.), and the deoiling rate reaches 90% at a concentration of 2000 mg/L. And as Xu Hui, methyl acrylate and 1, 3-propylene diamine are used as raw materials to synthesize a hyperbranched polymer reverse demulsifier (refer to Xu Hui, wei Qing, zhang Lifeng, and the like. The synthetic and performance of the hyperbranched polymer reverse demulsifier [ J ]. Fine petrochemical industry, 2019,36 (03): 46-49.), and the deoiling rate reaches 91% when the adding amount is 40mg/L, the demulsification temperature is 60 ℃ and the sedimentation time is 30 min. The above-mentioned research has very good effect on general crude oil demulsification, but the applicability to condensate oil is yet to be studied. Unlike crude oil demulsification, condensate oil emulsion is a special emulsion layer for demulsifying oil fields rarely, the causes are complex and changeable, the condensate oil has generally smaller molecular weight, emulsion is formed by emulsification more easily, and the selection of the demulsifier becomes a difficult point. Chinese patent application No. CN201310552699.8, entitled "a condensate emulsion demulsifier and application thereof" discloses a condensate emulsion demulsifier and application thereof, the demulsifier is composed of, by mass, 100% of benzenesulfonate anionic surfactant, 5-10% of polyether nonionic surfactant, 5-20% of polyether nonionic surfactant, 10-30% of low molecular alcohol, and the balance of water. However, this patent focuses on the use in condensate acid gas fields, where large amounts of sulfonates and dispersants are added to the formulation, which are inferior in acid and alkali resistance and salt resistance. The Chinese patent with the application number of CN201410200571.X and the name of preparation method and application of a condensate demulsifier discloses a preparation method and application of the condensate demulsifier, 5-60 parts by mass of solvent is added into a reaction kettle or a mixer, a stirrer is started, 2-25 parts of sulfonate, 5-20 parts of polyethylene polyamine polyoxyethylene polyoxypropylene polyether and 1-25 parts of polyoxyethylene polyoxypropylene stearyl ether are sequentially added for reaction for 1-30 minutes, and 1-15 parts of alkyl phenolic resin block polyether, 5-10 parts of silicon-containing demulsifier and 5-10 parts of dispersing agent are slowly added for reaction for 10-60 minutes. However, the addition of an organosilicon surfactant in addition to a large amount of sulfonate in the formula of the patent can increase the silicon content of condensate oil and reduce the quality of the condensate oil, and the formula has changeable components, complex components and poor controllability. Therefore, the condensate demulsifier which has excellent performance and good demulsification effect and can remarkably improve the oil-water separation efficiency of the condensate emulsion is prepared under the environment of mild preparation conditions, easily controlled reaction conditions and safe reaction process. Disclosure of Invention The present invention is directed to solving one or more of the problems of the prior art, including the shortcomings of the prior art. For example, one of the purposes of the invention is to provide a preparation method of condensate demulsifier with mild preparation conditions, easy control of reaction conditions and safe reaction process. For another example, another object of the present invention is to provide a condensate demulsifier that has stable properties, excellent performance, good demulsification effect, and can significantly improve the oil-water separation efficiency of the condensate emulsion. In order to achieve the aim, the invention provides a preparation method of a condensate oil nanoemulsion, which comprises