BZ19-6低渗透储层反凝析污染及解除方法实验研究

doi:10.13809/j.cnki.cn32-1825/te.2024.01.014

Abstract

Abstract:

The BZ19-6 condensate gas field, characterized by large reserves, small surface pressure differential, high temperature and pressure reservoir conditions, and low porosity and permeability, is highly susceptible to retrograde condensation contamination during production operations. Evaluating the degree of retrograde condensation contamination and adopting appropriate contamination remediation measures are crucial for improving the situation in the BZ19-6 condensate gas field. The long core failure experiment was carried out using the mixed condensate gas to simulate the reverse condensate pollution, test the gas permeability corresponding to different exhaustion pressure points and evaluate the degree of reverse condensate pollution. Additionally, experiments on remediation of retrograde condensation contamination were carried out using three different approaches: injection of surfactant（TC281）, injection of methanol, and injection of a combination of methanol and surfactant. Furthermore, an experiment was conducted using a combination of methanol and surfactant to address both retrograde condensation and water blockage, a comprehensive liquid phase contamination. The experimental results indicate that all three schemes of injecting active agent（TC281）, injecting methanol and injecting methanol + active agent have certain effects on removing retrograde condensation pollution. The group of injecting methanol + active agent 1 has the best effect on removing retrograde condensation and removing retrograde condensation pollution, and the permeability recovery rate is 84%. The permeability recovery rate of methanol injection to remove retrograde condensation pollution is 81%. The recovery rate of retrograde condensate permeability in the surfactant injection group 1 was 54%. The injection of methanol + active agent 1 relieved the comprehensive liquid phase pollution of reverse condensation + water lock, and the permeability recovery rate reached 80%. These experiments provide guidance for remediation strategies to address retrograde condensation contamination in the BZ19-6 condensate gas field.

Key words: low permeability, condensate gas reservoir, retrograde condensate damage, remove damage, permeability recovering rate

CLC Number:

TE372

TANG Yong, TANG Kai, XIA Guang, XU Di. Retrograde condensation pollution and removal method of BZ19-6 low permeability reservoir[J].Petroleum Reservoir Evaluation and Development, 2024, 14(1): 102-107.

Figures/Tables 11

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Table 1

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Table 2

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References 23

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取心编号	长岩心编号	孔隙度/ %	渗透率/10^-3μm²	长度/ cm	直径/ cm
2-003A	5	5.44	0.15	5.02	2.52
2-004A	3	4.11	0.07	5.09	2.53
2-005A	4	5.89	0.09	5.03	2.53
2-006A	6	7.51	0.14	5.18	2.53
2-008A	1	7.25	0.64	5.05	2.53
2-009A	2	7.49	0.34	5.02	2.52

解堵剂	束缚水渗透率/μm²	反凝析后渗透率/μm²	解堵后渗透率/μm²	渗透率恢复率（K₂/K₀）/%
甲醇	1.78×10^-5	0.64×10^-5	1.43×10^-5	81
甲醇+TC281	1.78×10^-5	0.64×10^-5	1.49×10^-5	84
TC281	1.78×10^-5	0.64×10^-5	0.96×10^-5	54

Retrograde condensation pollution and removal method of BZ19-6 low permeability reservoir

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