火驱阶段特征对比与分析

doi:10.13809/j.cnki.cn32-1825/te.2020.05.017

摘要/Abstract

摘要：

燃烧阶段的划分对火驱有着重要的意义,可以指导现场的生产设计与调控。而以往燃烧阶段划分方法的阶段特征较为片面,没有考虑到多方面因素,其参数指标的适用性不强。为了得到更全面的火驱燃烧阶段划分及驱油特征,通过一维燃烧管实验、数值模拟与火驱现场实例的对比分析,研究了不同火驱的阶段特点,并将不同火驱过程中的生产动态、燃烧前缘推进特征进行对比论证,从中选取了生产井的产量增加倍数、含水率、空气油比、氧气含量、燃烧前缘推进速度等10个参数进行阶段性分析,得到阶段性特征,并将其作为阶段划分对比的指标,将富氧燃烧火驱、常规火驱分为4个阶段,蒸汽吞吐后火驱分为5个阶段,并建立了较为完善的燃烧阶段划分的参考标准,为现场生产提供参考。

关键词: 燃烧管实验, 火驱, 阶段划分, 燃烧前缘, 生产动态分析

Abstract:

The division of combustion stage is significance to fire drive, which can guide the production design and control in site. However, the characteristics of the previous combustion stage division methods are one-sided without considering many factors, and the applicability of its parameter index is not strong. In order to obtain a more comprehensive combustion phase division and oil displacement characteristic of in situ combustion（ISC）, the characteristics of different fire drive stages are studied by the experiment of one-dimensional combustion tube and the comparison of numerical simulation and field example of ISC. Meanwhile, the production dynamics and the characteristics of combustion front propulsion in the process of in situ combustion are compared and analyzed. 10 parameters, such as yield increase multiple, water cut, air/oil ratio, oxygen content of production well, and combustion leading edge propulsion velocity, are selected for the stage analysis to obtain the stage characteristics, which is used as the index of stage division and contrast. The conventional fire drive is divided into four stages, while the fire drive after steam huff and puff is divided into five stages. The reference standard for the division of combustion stage is established, guiding the on-site production.

Key words: combustion tube experiment, in situ combustion（ISC）, stage division, burning front, Production dynamic analysis

中图分类号:

TE357

蒋海岩,李晓倩,高成国,任宗孝,袁士宝. 火驱阶段特征对比与分析[J]. 油气藏评价与开发, 2020, 10(5): 114-119.

JIANG Haiyan,LI Xiaoqi,GAO Chengguo,REN Zongxiao,YUAN Shibao. Comparison and analysis of stage feature of in situ combustion[J]. Reservoir Evaluation and Development, 2020, 10(5): 114-119.

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阶段划分		燃烧程度/ %		产量增加倍数,Q/Q₀		采出程度/ %	含水率/ %			氧气含量/ %			燃烧前缘推进速度/ （m·d^-1）	燃烧带厚度/m		燃烧前缘温度/℃	产出端温度变化/ （℃·d^-1）		空气油比/ （m³·t^-1）
阶段划分		常规火驱	吞吐后火驱	常规火驱	吞吐后火驱	常规火驱	常规火驱	吞吐后火驱	富氧燃烧	常规火驱	富氧燃烧	吞吐后火驱	常规火驱	常规火驱	吞吐后火驱	常规火驱	常规火驱	吞吐后火驱	常规火驱	吞吐后火驱
燃烧建立阶段	排水阶段	0~ 20 %	0~ 10 %	无变化	无变化	5 %	低产水	90 %以上	低产水	较正常空气含量明显下降	含量明显下降	较正常空气明显下降	缓慢, 0.04 m/d 左右	0.2 m	0.1 m	300 ℃ 左右	无变化	无变化	大于经济值	大于经济值
油井见效阶段	反应阶段	20 % ~50 %	10~ 20 %	2~5 倍	2~3倍	上升至20 %左右	5 %左右	下降至50 %左右	5 % 左右	2 %	大于2 %	2 %以下	快速上升, 达0.13 m/d 左右	0.8 m	0.2 m	上升至500 ℃	平稳上升	缓慢上升	趋稳定, 2 000 左右	1 000左右
热效驱油阶段	产量上升阶段	50 % ~80 %	20~ 40 %	2~10倍	3~6倍	平稳上升至80 %	平稳上升至30 %	30 %左右	上升至30 %	2 %~ 5 %	含量明显上升	2 %左右	回落, 保持稳定, 0.07 m/d	1.2 m 左右	0.5 m左右	保持稳定	明显上升	平稳上升	趋稳定, 2 000 左右	1 000左右
热效驱油阶段	稳产阶段	50 % ~80 %	40~ 75 %	2~10倍	2~5倍	平稳上升至80 %	平稳上升至30 %	30 %左右	上升至30 %	2 %~ 5 %	含量明显上升	5 %以下	回落, 保持稳定, 0.07 m/d	1.2 m 左右	0.6 m左右	保持稳定	明显上升	平稳上升	趋稳定, 2 000 左右	大于 1 000
油井见火阶段	氧气突破阶段	80 % 以上	>75 %	迅速下降	迅速下降	保持稳定, 大于80 %	快速上升, 可达40 %	上升至40 %以上	上升至40 %以上	明显上升至5 %	较富氧空气含量低	明显上升至5 %	回升, 0.1 m/d 左右	1.5 m 左右	0.8 m左右	下降至300 ℃	迅速上升	明显上升	高出稳定值	1 000以上