Flow characteristic of polymer solutions in porous media: Influence of the molecular weight and concentration

IF 4.2 Q2 ENERGY & FUELS

Petroleum Pub Date : 2023-06-01 DOI:10.1016/j.petlm.2023.03.002

Yingjie Dai , Jia Li , Li Li , Yifei Liu , Yuan Li , Xiangyu Wang , Xuguang Song , Caili Dai , Bin Yuan

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引用次数: 0

Abstract

The polymer solution flow in porous media is a central research topic related to hydraulic fracturing measures, formation damage and fracture propagation. Influenced by molecular weights and concentrations, various flow patterns of polymer in pores are presented, resulting in different filtration loss. In this work, the effectiveness of various polymer solutions for filtration loss was assessed by utilizing the core flooding experiment firstly. The result shows that lesser filtration loss normally is inextricably linked to solutions with high molecular weight and concentration. Subsequently, the flow behaviors of polymer solutions investigated by designed micro pore-throat structure and micro-particle image velocimetry (μ-PIV) further confirmed the above result. It was found that the central convergent flow pattern benefiting from higher viscous force loss and less filtration loss was observed at high flow rates (0.5 mL/h), and higher molecular weight and concentration were more prone to convergent flow patterns. The viscosity force loss increases by about 4 times varying the molecular weight of polymer from 5 × 10⁶ to 18 × 10⁶ g/mol or the concentration from 0.05 to 0.3%. It interprets higher molecular weight and concentration in core studies and field observations with decreased filtration loss of HPAM. This work provides a theoretical foundation for the application of fracturing fluids as well as fresh perspectives on how to access the filtration loss of fracturing fluids.

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聚合物溶液在多孔介质中的流动特性:分子量和浓度的影响

聚合物溶液在多孔介质中的流动是一个与水力压裂措施、地层损害和裂缝扩展相关的核心研究课题。受分子量和浓度的影响，聚合物在孔隙中呈现出不同的流动模式，从而导致不同的滤失。本文首先利用岩心驱油实验，评价了不同聚合物溶液对滤失效果的影响。结果表明，较小的过滤损失通常与高分子量和高浓度的溶液密不可分。随后，通过设计的微孔喉结构和微粒子成像测速仪(μ-PIV)对聚合物溶液的流动行为进行了研究，进一步证实了上述结果。研究发现，在高流速(0.5 mL/h)条件下，胶黏力损失较大，过滤损失较小，且分子量和浓度越高，胶黏力损失越大，胶黏力损失越小。聚合物的分子量从5 × 106到18 × 106 g/mol，浓度从0.05到0.3%，黏力损失增加约4倍。它解释了核心研究和现场观察中HPAM的分子量和浓度较高，过滤损失减少。该研究为压裂液的应用提供了理论基础，也为压裂液滤失量的研究提供了新的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Petroleum Earth and Planetary Sciences-Geology

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

124 days

期刊介绍： Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing