非均质油藏层间干扰室内实验优化

doi:10.7657/XJPG20240208

摘要/Abstract

摘要：

多层非均质油藏在合注合采开发时，受储集层岩性、物性、地层压力、流体性质等因素影响，层与层之间相互干扰。早期开展的并联驱替室内实验，无法有效地模拟油藏多层合采时各层间的流体交换，且所定义的干扰系数的物理内涵与注水开发渗流过程不符。为此，建立串并联组合驱替实验模型，模拟储集层层内岩性的变化。通过研究串并联驱替实验下不同渗透率岩心的产油量、含水率以及采收率，对干扰系数进行验证和再认识。研究结果表明：层间干扰的实质是不同储集层渗流阻力随着时间的变化，导致储集层流量分配发生改变；储集层非均质性是多层合采过程中形成优势渗流通道的主要因素。研究结果为后续开展层间干扰相关实验设计和非均质油藏合理高效开发提供了参考依据。

关键词: 非均质油藏, 层间干扰, 干扰系数, 驱替实验, 并联, 串联, 岩心

Abstract:

During the development of multi-layer heterogeneous reservoirs through commingled injection and production, interference between layers occurs due to various factors such as reservoir lithology, petrophysical properties, formation pressure, and fluid properties. The previous laboratory experiments on parallel displacement failed to effectively simulate fluid exchange between layers during the commingled production of multiple layers, and the physical meaning of the defined interference coefficient does not align with the flow process in water injection development. In this paper, an experimental model of series-parallel combined displacement was established to simulate the variation of lithology within the reservoir layers. The oil production, water cut, and recovery rate of cores with different permeabilities in the experiments were investigated to verify and re-understand the interference coefficient. The results show that interlayer interference is essentially a phenomenon that the variation of flow resistance of reservoir layers with time leads to alteration in flow distribution within the layers. Reservoir heterogeneity is identified as a key factor in forming dominant flow channels during commingled production. The research results provide a reference for designing interlayer interference experiments and developing heterogeneous reservoirs rationally and efficiently.

Key words: heterogeneous reservoir, interlayer interference, interference coefficient, displacement experiment, parallel, series, core

中图分类号:

TE311

王杰, 黎鸿屿, 吕栋梁, 钱川川, 周群茂. 非均质油藏层间干扰室内实验优化[J]. 新疆石油地质, 2024, 45(2): 199-204.

WANG Jie, LI Hongyu, LYU Dongliang, QIAN Chuanchuan, ZHOU Qunmao. Optimized Laboratory Experiment on Interlayer Interference in Heterogeneous Reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(2): 199-204.

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驱替时间/s	单采各岩心产油量/mL				合采各岩心产油量/mL
驱替时间/s	3-3	4-3	Z3	Z5	3-3	4-3	Z3	Z5
0	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
43	0.30	0.61	0.80	0.50	0.10	0.15	0.50	0.35
66	0.35	0.64	0.95	0.80	0.13	0.26	0.85	0.52
199	0.40	0.80	1.10	1.40	0.20	0.56	1.00	1.31
252	0.55	0.94	1.10	1.50	0.40	0.60	1.05	1.33
347	0.70	1.10	1.10	1.50	0.60	0.70	1.10	1.36
740	0.80	1.60	1.10	1.50	0.80	1.00	1.10	1.40
1 313	0.80	1.80	1.10	1.50	0.80	1.40	1.10	1.50
3 013	0.80	2.00	1.10	1.50	0.80	2.00	1.10	1.50