CN-122011277-A - Preparation method of high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid

CN122011277ACN 122011277 ACN122011277 ACN 122011277ACN-122011277-A

Abstract

The invention discloses a preparation method of a high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid, and belongs to the technical field of oil drag reducer preparation. The drag reducer (PAAAF) takes gallium-based liquid metal (GLM@BCNF) coated by Bacterial Cellulose Nanofiber (BCNF) as a low-temperature rapid initiator, combines Acrylamide (AM), acrylic Acid (AA) and 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) as comonomers, and simultaneously introduces the high-temperature resistance of fluorine-containing imidazole ionic liquid (FIL) reinforced materials. The introduction BCNF can better disperse liquid gallium, simultaneously provide a continuous heat conduction network and accelerate initiation efficiency. AMPS gives excellent salt resistance to drag reducer, while fluoroimidazole ionic liquid improves its thermal stability remarkably. The drag reducer prepared by the invention has the characteristics of quick initiation, high temperature resistance, high salt resistance and high-efficiency drag reduction, and has wide application prospects in high-temperature and high-salt systems such as oil gas exploitation, geothermal development and the like.

Inventors

LUO MINA
TAO DEJIAN
ZHONG CHENG
GUO JIANCHUN
ZHANG XUEZHONG
ZHANG YUXIN

Assignees

西南石油大学

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The preparation method of the high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid is characterized by comprising the following steps of: S1, mixing gallium-based liquid metal (GLM) with deionized water and performing ultrasonic treatment to obtain GLM suspension; S2, mixing cellulose and GLM suspension liquid and performing ultrasonic treatment to obtain cellulose modified gallium-based liquid metal suspension liquid (GLM@BCNF); S3, mixing Acrylamide (AM), acrylic Acid (AA), 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and fluorine-containing imidazole ionic liquid (FIL) with deionized water, and uniformly stirring to obtain a uniform monomer mixed solution; s4, blending and stirring the uniform monomer mixed solution obtained in the step S3 and the cellulose modified gallium-based liquid metal suspension obtained in the step S2, and rapidly initiating a polymerization reaction at room temperature to obtain polymer gel; S5, washing the polymer gel prepared in the step S4 with ethanol to remove unreacted monomers and byproducts in the system and promote the polymer to be fully separated out; S6, drying the washed polymer under normal pressure to remove the solvent, and crushing the dried polymer to obtain the high-temperature-resistant and salt-resistant instant dry powder drag reducer.
2. The preparation method of the high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid is characterized in that the mass ratio of the gallium-based liquid metal to deionized water in the step S1 is 1:20-1:100, the specific conditions of ultrasonic treatment in the step S1 are that the ultrasonic power is 400-800W, the pulse mode is 0.1S/0.3S, the temperature is 0-10 ℃, and the time is 20-60 min.
3. The preparation method of the high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid is characterized in that the cellulose in the step S2 is bacterial cellulose or Carboxylated Cellulose Nanofiber (CCNF) with the concentration of 0.5-wt% -10-wt% of dispersion liquid, the cellulose and GLM suspension liquid in the step S2 are mixed with ultrasound, and the specific conditions are that the mass ratio of the gallium-based liquid metal to the cellulose (in terms of solid content) is 1:0.5-1:5, the ultrasonic power is 400-800W, the pulse mode is 0.1S/stop 0.3S, the temperature is 0-10 ℃, and the time is 20-60 min.
4. The preparation method of the high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid is characterized in that the specific conditions of mixing Acrylamide (AM), acrylic Acid (AA), 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and fluorine-containing imidazole ionic liquid (FIL) with deionized water in the step S3 are that the mass fraction of the AM is 10 wt% -30 wt%, the mass ratio of the total mass of the AM, the AA and the AMPS to the total mass of the deionized water and the FIL is 1:2-1:5, the mass ratio of the AM, the AA and the AMPS is (20-80) (5-30) (10-50), the mass ratio of the FIL is 1wt% -10 wt% of the total mass of monomers, and the components are uniformly mixed and stirred to prepare a monomer mixed solution.
5. The preparation method of the high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid according to claim 1, wherein the specific conditions of blending and stirring in the step S4 are that the mass ratio of GLM in GLM@BCNF suspension to the total mass of monomers is 1:500-1:100, and the stirring and mixing temperature is 5-30 ℃ and the time is 1-10 min.
6. The method for preparing the high-temperature-resistant salt-resistant instant drag reducer by initiating polymerization by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid according to claim 1, wherein the specific conditions of ethanol washing in the step S5 are that ethanol aqueous solution with the volume ratio of 1:1-1:5 is adopted for washing, and the washing times are 2-5.
7. The method for preparing the high-temperature-resistant salt-resistant instant drag reducer by polymerization initiated by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid according to claim 1, wherein the specific condition of drying in the step S6 is that the drying temperature is 40-80 ℃ and the drying time is 12-48 h.
8. The method for preparing the high-temperature-resistant salt-resistant instant drag reducer by polymerization initiated by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid according to claim 1, wherein the specific conditions of crushing in the step S6 are that the crushing rotating speed is 2000 r/min-5000 r/min, the crushing time is 10 min-30 min, and the particle size of the drag reducer prepared after crushing is controlled to be 80-200 meshes.
9. A high temperature resistant and salt resistant instant drag reducer polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid, characterized in that the drag reducer is prepared by the preparation method of any one of claims 1-8.
10. The high temperature resistant and salt resistant instant drag reducer initiated by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid according to claim 9, wherein the drag reducer is a copolymer dry powder polymerized by taking cellulose modified gallium-based liquid metal (GLM@BCNF) as a low temperature initiator, acrylamide (AM), acrylic Acid (AA) and 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) as monomers, and fluorine-containing imidazole ionic liquid (FIL) as a high temperature resistant instant auxiliary agent.

Description

Preparation method of high-temperature-resistant salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid Technical Field The invention relates to the technical field of oil drag reducer preparation, in particular to a gallium-based liquid metal modified by cellulose (including bacterial cellulose and cellulose nanofiber) as a low-temperature free radical initiator, and high-performance salt-resistant Wen Jianzu-agent dry powder formed by copolymerization of Acrylamide (AM), acrylic Acid (AA) and 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), and fluorine-containing imidazole zwitterionic liquid (FIL) are used for endowing the drag reducer with excellent high-temperature stability and quick dissolution performance. Background In the fields of oil exploitation, hydraulic transportation, heating systems and the like, the flow resistance of fluid in a pipeline is one of the main sources of energy consumption. The polymer drag reducer effectively reduces the fluid turbulence resistance by changing the structure of a fluid boundary layer, thereby obviously improving the conveying efficiency and saving energy. However, some limitations are common to existing polymeric drag reducers. First, many drag reducers have poor stability in high temperature environments and are subject to degradation, which results in rapid attenuation of drag reduction effects and difficulty in meeting the requirements of high temperature oil and gas fields or geothermal fluid transport. Secondly, in formation water or industrial wastewater with high salt content, polymer chains of the traditional drag reducer are easy to curl or aggregate, so that water solubility is reduced, drag reduction performance is greatly reduced, and salt resistance is insufficient. Moreover, most polymeric drag reducing agents are typically present in the form of liquid concentrates or solid particles for use in the field, which have relatively slow dissolution rates and require long agitation to dissolve completely, affecting the efficiency of the field operation. In addition, conventional polymer synthesis often requires external heating, ultraviolet irradiation or the use of persulfate, azo-type and other initiators, which may have problems such as toxicity, inconvenient storage or severe initiation conditions. Liquid gallium (Ga) and its alloys have been found in recent years to be effective initiators for radical polymerization of vinyl monomers due to their unique physicochemical properties such as high thermal conductivity, low melting point, and surface oxidation susceptibility to form reactive oxide layers. The polymerization process can be usually carried out at room temperature or even lower temperature without additional illumination or heating, and has the advantages of greenness and high efficiency. However, liquid metals are difficult to stably disperse into nano-sized droplets in an aqueous phase due to their large surface energy and cohesive energy, and are easily agglomerated, thereby affecting their initiation efficiency and uniform distribution in a polymer matrix. In addition, after the liquid metal initiates polymerization, further post-treatment processes are required to prepare the dry powder product. Therefore, the polymer drag reducer dry powder which can overcome the defects, integrates the characteristics of high temperature resistance, salt resistance and instant dissolution, can be prepared in a high-efficiency and green initiation mode and has important theoretical significance and practical application value is developed. Disclosure of Invention In view of the problems of complex preparation, poor solubility, harsh polymerization initiation conditions (such as ultraviolet irradiation or higher temperature), performance reduction in a high-temperature and high-salt environment and the like of the high-temperature-resistant salt resistance reducing agent in the prior art, the invention aims to provide the dry powder resistance reducing agent which is simple and convenient to prepare, can rapidly initiate polymerization at room temperature, has excellent high-temperature-resistant salt resistance and rapid solubility, and the preparation method thereof. In order to solve the problems, the technical scheme of the invention is as follows: The invention provides a preparation method of a high-temperature-resistant and salt-resistant instant drag reducer initiated and polymerized by cellulose, gallium-based liquid metal and fluorine-containing ionic liquid, wherein the drag reducer takes cellulose modified gallium-based liquid metal (GLM@BCNF) as a low-temperature initiator, acrylamide (AM), acrylic Acid (AA) and 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) as monomers, and fluorine-containing imidazole ionic liquid (FIL) as a high-temperature-resistant instant auxiliary agent or comonomer. The GLM@BCNF is used for rapidly initiating the polymeriza