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

油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (1): 102-107.doi: 10.13809/j.cnki.cn32-1825/te.2024.01.014

BZ19-6低渗透储层反凝析污染及解除方法实验研究

汤勇¹(),唐凯²(),夏光³,徐笛⁴

1.西南石油大学油气藏地质及开发工程国家重点实验室，四川成都 610500
2.中国石油塔里木油田分公司英买采油气管理区，新疆库尔勒 841000
3.中海油能源发展股份有限公司钻采工程研究院，天津 100027
4.中国石油新疆油田分公司玛湖勘探开发项目部，新疆克拉玛依 834000

收稿日期:2023-03-13 发布日期:2024-03-05 出版日期:2024-02-26
通讯作者: 唐凯（1993—），男，硕士，助理工程师，主要从事气田与凝析气田开发相关研究工作。地址：新疆库尔勒市石化大道26号，邮政编码：841000。E-mail:416231575@qq.com
作者简介:汤勇（1975—），男，博士，教授，现从事油气相态理论及测试、气田及凝析气田开发、注气提高采收率方面的教学及科研工作。地址：四川省成都市新都大道8号，邮政编码：610500。E-mail：tangyong2004@126.com
基金资助:
国家自然科学基金面上项目“超低渗透油藏CO2强化采油过程中多孔介质相态及微观渗流机理研究”(51974268)

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

TANG Yong¹(),TANG Kai²(),XIA Guang³,XU Di⁴

1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Yingmai Oil and Gas Production Management Area, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
3. Drilling and Production Engineering Research Institute of CNOOC Energy Development Co. Ltd., Tianjin 100027, China
4. Exploration and Development Project Department of Mahu Area, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China

Received:2023-03-13 Online:2024-03-05 Published:2024-02-26

摘要/Abstract

摘要：

BZ19-6凝析气田储量大、地露压差小、储层高温高压且低孔低渗，生产作业过程中极易产生反凝析污染。评价反凝析污染程度，采用合适的污染解除措施，对改善BZ19-6凝析气田反凝析污染具有重要意义。利用复配凝析气开展长岩心衰竭实验，模拟反凝析油污染，测试不同衰竭压力点对应的气相渗透率并评价反凝析污染程度；同时开展了注活性剂（TC281）、注甲醇、注甲醇+活性剂3组解除反凝析污染实验，及注甲醇+活性剂1组解除反凝析+水锁综合液相污染实验。实验结果表明：注活性剂（TC281）、注甲醇、注甲醇+活性剂3种方案对解除反凝析污染均有一定效果，注甲醇+活性剂1组解除反凝析污染效果最好，渗透率恢复率达84%；注甲醇解除反凝析污染渗透率恢复率为81%；注活性剂1组解除反凝析渗透率恢复率为54%；注甲醇+活性剂1组解除反凝析+水锁综合液相污染，渗透率恢复率达到80%。实验为BZ19-6凝析气田解除反凝析污染提供了方案指导。

关键词: 低渗透, 凝析气藏, 反凝析污染, 解除污染, 渗透率恢复率

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

中图分类号:

TE372

汤勇,唐凯,夏光等. BZ19-6低渗透储层反凝析污染及解除方法实验研究[J]. 油气藏评价与开发, 2024, 14(1): 102-107.

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

图/表 11

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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

BZ19-6低渗透储层反凝析污染及解除方法实验研究

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

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