新疆石油天然气 ›› 2024, Vol. 20 ›› Issue (1): 38-43.DOI: 10.12388/j.issn.1673-2677.2024.01.005

• 油气开发 • 上一篇    下一篇

超稠油老区氮气辅助VHSD开发数值模拟

  

  1. 中国石油新疆油田分公司,新疆克拉玛依 834000

  • 出版日期:2024-03-06 发布日期:2024-03-06
  • 作者简介:王攀(1987-),2023年在西南石油大学攻读硕士,高级工程师,现从事超稠油油藏驱泄开发研究工作。(Tel)15809003623(E-mail)406588708@qq.com
  • 基金资助:

    国家科技重大专项“油田开发新技术新方法研究”(2021DJ0901)

Numerical Simulation of Nitrogen-Assisted VHSD Development in Old Super-Heavy Oil Reservoirs

  1. PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China

  • Online:2024-03-06 Published:2024-03-06

摘要:

转直井辅助水平井重力泄油(VHSD)开发方式已成为超稠油老区进一步提高区块采油速度、油藏采收率的重要调整手段。氮气辅助VHSD的增能提压、顶部隔热效应可有效解决超稠油老区吞吐后压力保持程度低、驱泄操作压力低、蒸汽腔温度低的问题,进而实现节约蒸汽用量、提高产油水平、提升油汽比和减耗降碳的目的。以克拉玛依油田九区某VHSD开发单元为例,采用数值模拟方法分析了在氮气辅助VHSD开发过程中注氮时机、注氮方式、注氮量等参数对提压增能、建立隔热层的影响,以及采出速度和累计注采的变化特点。研究表明,转驱泄初期采用段塞方式注入氮气可有效建立隔热层;矿场试验表明,井组油汽比提升0.025,日产油提升0.7 t,取得了较好的应用效果。研究成果为同类型超稠油老区氮气辅助VHSD效益开发提供了技术借鉴。

关键词:

VHSD, 氮气辅助, 增能提压, 隔热层, 数值模拟, 超稠油

Abstract:

Changing over to Vertical-Horizonal well Steam Drive (VHSD) development pattern is becoming an important means for improving block production rate and recovery rate in old super-heavy oil reservoirs. Nitrogen-assisted VHSD can increase energy and pressure and form a heat insulating top layer,effectively solving the problems of pressure maintenance,low displacement pressure,and low steam chamber temperatures following huff-puff operations in old heavy oil reservoirs,saving steam volume,improving oil production levels and oil-steam ratio,and reducing carbon consumption. This paper examines a VHSD development unit in the Ninth Block of Karamay Oilfield. Numerical simulation is used to determine the influences of different parameters (nitrogen injection timing,injection pattern,injection amount) on pressure and energy increase,and on the establishment of heat insulating layers. Variations in recovery rates and accumulated injection-production indicators during VHSD development are also analyzed. The results show that nitrogen injection by slug can help to build a heat insulating layer in the initial stages of the transition to displacement and drainage. In field tests of this nitrogen-assisted VHSD approach,the oil-steam ratio of the study well group was increased by 0.025,and daily oil production was increased by 0.7 t,which are favorable results. This study provides a technical reference for efficient development using nitrogen-assisted VHSD in similar old heavy oil reservoirs.

Key words:

VHSD, nitrogen-assisted, increasing energy and pressure, heat insulating layer, numerical simulation, super heavy oil

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