支化预交联凝胶颗粒提高采收率机理实验

doi:10.3969/j.issn.1006-6535.2023.05.014

摘要/Abstract

摘要： 为解决华北油田河间东营某区块化学驱因聚合物老化导致的驱油体系黏度及驱油效果下降的问题,基于黏度和黏弹性测试、粒径分布测量、核磁共振测试、并联岩心驱替等多种实验手段,明确了支化预交联凝胶颗粒(B-PPG)的微观驱油机理以及并联岩心的驱油效果。结果显示:B-PPG分子的支链结构的水溶性较好,可提高溶液的表观黏度;B-PPG网状分子结构以破碎或变形的方式进入地层,从而改善流度比,提高非均质储层的波及效率;当主力油层的渗透率级差为7.4时,质量浓度为2 000 mg/L的B-PPG体系提高采收率的幅度较水驱高20%。研究表明:B-PPG体系黏弹性好,变形能力强,具有理想的抗盐性,能在高渗层形成有效封堵,大幅度提高采收率。该研究为改善高温高盐油藏剖面、封堵高渗优势通道、大幅度提高油藏波及效率和采收率提供了借鉴。

关键词: 支化预交联凝胶颗粒, 黏弹性测试, 性能测试, 提高采收率, 封堵实验, 波及效率

Abstract: In order to solve the problem of decreasing viscosity and oil displacement effect of the oil displacement system due to polymer aging of the chemical displacement in a certain block in Dongying, Hejian, Huabei Oilfield, the microscopic oil displacement mechanism of branched pre-crosslinked gel particles (B-PPGs) as well as the oil displacement effect of parallel cores were clarified based on a variety of experimental means such as viscosity and viscoelasticity tests, particle size distribution measurements, nuclear magnetic resonance (NMR) tests, and parallel core displacement. The results show that the branched structure of B-PPG molecules has better water solubility, which can improve the apparent viscosity of the solution; the B-PPG reticulated molecular structure enters into the formation in a crushed or deformed manner, which improves the mobility ratio and increases the sweep efficiency of the non-homogeneous reservoirs; when the permeability gradient of the main reservoir is 7.4, the recovery enhancement of the B-PPG system with a mass concentration of 2000 mg/L is 20% higher than that of the water displacement. The study shows that: The B-PPG system has good viscoelasticity, strong deformation ability, and ideal salt resistance, which can form an effective seal in the highly permeable layer and substantially increase the recovery rate. This study provides a reference for improving the profile of high-temperature and high-salt reservoirs, sealing the preferential channels of high permeability, and substantially increasing the reservoir sweep efficiency and recovery rate.

Key words: branched pre-crosslinked gel particles, viscoelasticity test, performance test, enhanced recovery, sealing experiment, sweep efficiency

中图分类号:

TE357.46

孟庆春, 何刚, 郭发军, 李华斌, 王莉. 支化预交联凝胶颗粒提高采收率机理实验[J]. 特种油气藏, 2023, 30(5): 105-112.

Meng Qingchun, He Gang, Guo Fajun, Li Huabin, Wang Li. Experiment on the Mechanism of Enhanced Recovery by Branched Pre-Crosslinked Gel Particles[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 105-112.

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