Preparation of thickened P(AA-AMPS) copolymers by inverse emulsion polymerization and evaluation of fracturing and oil flooding performance

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2024-11-01 DOI:10.1016/j.molliq.2024.126400

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Abstract

Polymer is an essential type of fracturing fluid. Nevertheless, issues such as slow dissolution, high initial viscosity, and challenges in storage, transportation and operation limit its application. To address these issues, a thickened copolymer P(AA-AMPS) was synthesized by inverse emulsion polymerization using acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as the monomers. Three P(AA-AMPS) copolymers were obtained by changing the weight ratio of AA and AMPS monomers. When the weight ratio of AA to AMPS monomers was 8.2:1.8, the P(AA-AMPS) copolymer solution exhibited the best interfacial activity, reducing the oil–water interfacial tension to 3.95 mN m⁻¹. The initial viscosity of the copolymer was only 66 mPa s, but its solution could reach a high viscosity of up to 817 mPa s. P(AA-AMPS) copolymers demonstrated good resistance for temperature and shear. For instance, the viscosity of copolymer solution still remained 300 mPa s with a shear rate of 170 s⁻¹ at 90 °C. Furthermore, P(AA-AMPS) copolymers had excellent gel-breaking capacity, sand suspension stability, wettability and oil displacement ability. Therefore, the integration of fracturing and oil flooding can be realized for the development of low permeability reservoirs by selecting appropriate copolymers. P(AA-AMPS) copolymers would play an important role due to their significant viscosity differences and easy operation on storage, transportation and application.

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通过反向乳液聚合法制备增稠 P（AA-AMPS）共聚物并评估其压裂和油浸性能

聚合物是一种重要的压裂液。然而，溶解慢、初始粘度高以及储存、运输和操作方面的挑战等问题限制了其应用。为了解决这些问题，我们以丙烯酸（AA）和 2-丙烯酰胺-2-甲基丙磺酸（AMPS）为单体，通过反向乳液聚合法合成了增稠共聚物 P(AA-AMPS)。通过改变 AA 和 AMPS 单体的重量比，得到了三种 P(AA-AMPS)共聚物。当 AA 与 AMPS 单体的重量比为 8.2:1.8 时，P(AA-AMPS) 共聚物溶液的界面活性最佳，可将油水界面张力降至 3.95 mN m-1。P(AA-AMPS) 共聚物的初始粘度仅为 66 mPa s，但其溶液的粘度可高达 817 mPa s。例如，在 90 °C 下，剪切速率为 170 s-1 时，共聚物溶液的粘度仍保持在 300 mPa s。此外，P（AA-AMPS）共聚物还具有优异的凝胶破裂能力、砂悬稳定性、润湿性和油置换能力。因此，选择合适的共聚物可以实现压裂与油浸的一体化，从而开发低渗透油藏。P（AA-AMPS）共聚物因其显著的粘度差异和易于储存、运输和应用而将发挥重要作用。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.