氮气对塔河油田原油轻质组分抽提作用实验与评价

doi:10.7623/syxb202103007

石油学报 ›› 2021, Vol. 42 ›› Issue (3): 341-349.DOI: 10.7623/syxb202103007

氮气对塔河油田原油轻质组分抽提作用实验与评价

宋传真^1,2, 赵海宁³, 张慧^1,2

1. 中国石油化工股份有限公司石油勘探开发研究院北京 100083;
2. 中国石油化工集团公司海相油气藏开发重点实验室北京 100083;
3. 中国石油大学(北京)安全与海洋工程学院北京 102249

收稿日期:2020-04-24 修回日期:2020-12-17 出版日期:2021-03-25 发布日期:2021-04-09
通讯作者: 宋传真,女,1974年9月生,1998年获成都理工学院学士学位,2001年获成都理工学院硕士学位,现为中国石油化工股份有限公司石油勘探开发研究院技术专家、高级工程师,主要从事特殊油气藏开发研究工作。
作者简介:宋传真,女,1974年9月生,1998年获成都理工学院学士学位,2001年获成都理工学院硕士学位,现为中国石油化工股份有限公司石油勘探开发研究院技术专家、高级工程师,主要从事特殊油气藏开发研究工作。Email:songfax.syky@sinopec.com
基金资助:
国家科技重大专项“缝洞型油藏注气提高采收率技术”（2016ZX05014-004）和国家自然科学基金青年科学基金项目（No.51604284）资助。

Experiment and evaluation of extraction effect of nitrogen on light components of crude oil in Tahe oilfield

Song Chuanzhen^1,2, Zhao Haining³, Zhang Hui^1,2

1. Sinopec Petroleum Exploration & Production Research Institute, Beijing 100083, China;
2. Sinopec Key Laboratory of Marine Oil & Gas Reservoirs Production, Beijing 100083, China;
3. College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, China

Received:2020-04-24 Revised:2020-12-17 Online:2021-03-25 Published:2021-04-09

摘要/Abstract

摘要： 采用塔河油田缝洞型油藏稀油和常规稠油两种代表性油样，通过开展向前多次接触相平衡实验模拟蒸发气驱过程、向后多次接触相平衡实验模拟凝析气驱过程，研究了氮气与塔河油田原油在高温高压条件下的相态变化，明确了氮气与地层原油充分接触混合后地层流体的气液组分变化规律，提出了抽提指数的计算表达式，定量评价了氮气在高温高压条件下对原油轻组分的抽提效果，深化了注氮气提高采收率作用机理的认识。研究结果表明，塔河油田油藏条件（压力>65 MPa、温度>415 K）下，原油中轻质组分（C₁—C₅）经过5次接触后的流失率高达94%~100%，氮气对原油有较强的抽提作用；向前接触实验中，随接触次数增加，抽提作用越来越强，抽提指数越来越大，同次接触氮气对稀油的抽提指数是稠油的5倍以上；注入气中加入20%的CO₂后对原油中轻质组分的抽提效果增强不显著，抽提指数仅小幅变化。两种气体与塔河油田稀油在多次向前接触后展现出了近混相的趋势；向后接触实验表明，首次接触抽提作用最大，抽提指数随着接触次数的增加逐渐减小至0，较之向前接触明显偏小。

关键词: 多次接触, 相平衡, 注氮气, 塔河油田, 抽提指数

Abstract: Using two representative oil samples of the light crude oil and conventional heavy oil from the Tahe fractured-cavity reservoir, the forward multiple-contact and the backward multiple-contact phase equilibrium experiment are performed to simulate the process of evaporative gas flooding and condensate gas flooding, respectively. On this basis, this paper investigates the phase behavior changes of nitrogen (N₂) and the Tahe oil under high temperature and high pressure, clarifies the changing rules of gas-liquid composition of the formation fluid sufficiently contacted and mixed with N₂, proposes the parameter ‘Extraction Indicator’ and its calculating formula, quantitatively evaluates the extraction effect of N₂ on the light components of crude oil under high temperatures and high pressures, and deepens the understanding of the mechanism of enhanced oil recovery by N₂ injection. The study shows that under Tahe reservoir conditions (pressure>65 MPa, temperature>415 K), up to 94% -100% of light components (C₁ to C₅) is extracted from the oil phase after 5 contacts with nitrogen, indicating that N₂ has a strong extraction effect on crude oil. In the forward contact experiment, with the increase in contact times, the extraction effect is getting stronger and the extraction indicator becomes larger. The corresponding extraction indicator of N₂ to thin oil is more than 5 times that of N₂ to heavy oil under the same contact condition. After adding 20% CO₂ to the injected nitrogen, the extraction effect on light components in oil is not significantly enhanced, and the extraction indicator only changes slightly. The near-miscible tendency is observed for both the N₂ and N₂-CO₂ injectant during forward contacting with the Tahe light oil for multiple times; the backward contact experiment shows that the extraction effect of the first contact is the strongest, and the extraction indicator is gradually decreased to 0 with the incrase in contact times, which is sigificantly smaller as compared with the results of the forward contact experiment.

Key words: multiple-contact, phase equilibrium, nitrogen injection, Tahe oilfield, extraction indicator

中图分类号:

TE357.7

宋传真, 赵海宁, 张慧. 氮气对塔河油田原油轻质组分抽提作用实验与评价[J]. 石油学报, 2021, 42(3): 341-349.

Song Chuanzhen, Zhao Haining, Zhang Hui. Experiment and evaluation of extraction effect of nitrogen on light components of crude oil in Tahe oilfield[J]. Acta Petrolei Sinica, 2021, 42(3): 341-349.

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氮气对塔河油田原油轻质组分抽提作用实验与评价

Experiment and evaluation of extraction effect of nitrogen on light components of crude oil in Tahe oilfield

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