中国石油勘探 ›› 2023, Vol. 28 ›› Issue (5): 135-144.DOI: 10.3969/j.issn.1672-7703.2023.05.012

• 工程技术 • 上一篇    下一篇

气井带压作业关键技术与展望

胡旭光1,2,李黔1,罗园2,庞平2,刘贵义2,罗卫华2,卿玉2,   

  1. 1西南石油大学石油与天然气工程学院;2中国石油集团川庆钻探公司井控应急救援响应中心
  • 出版日期:2023-09-15 发布日期:2023-09-15
  • 作者简介:胡旭光(1988-),男,湖北天门人,在读博士,现主要从事油气井井控技术研发工作。地址:四川省广汉市福州路三段,邮政编码:618300。
  • 基金资助:
    中国石油天然气集团有限公司科学研究与技术开发项目“气井带压作业技术推广”(2020B-4121),“陆上井控应急关键装备与配套技术研究”(2021ZZ03)。

Key technology and prospect of snubbing operation in gas well

Hu Xuguang1,2,Li Qian1,Luo Yuan2,Pang Ping2,Liu Guiyi2, Luo Weihua2,Qing Yu2   

  1. 1 Petroleum Engineering School, Southwest Petroleum University; 2 Well Control Emergency Rescue Response Center, CNPC Chuanqing Drilling Engineering Co., Ltd.
  • Online:2023-09-15 Published:2023-09-15

摘要: 气井带压作业技术是目前国际上气田开发中一项重要的完井和修井技术,可避免常规压井作业造成的储层伤害,具有保护储层、降本增效等突出的技术优势。针对气井带压作业中环空动密封耐磨件使用寿命短、管柱内密封工具压力等级低、管柱飞出及压弯风险高的突出技术难题,通过开展环空动密封压力控制技术、管柱内密封压力控制技术、防管柱飞出技术及防压弯管柱技术四方面研究,研制了井口压力35MPa下使用寿命超1200m的动密封耐磨件及70MPa管柱内密封工具,建立了管柱受力中和点的计算公式及极限抗弯长度计算模型。研究成果成功突破了环空动密封、管柱内密封等技术瓶颈,形成了气井带压作业关键技术,在中国石油长宁—威远、长庆油田及中国石化涪陵等区块累计应用逾千井次,极大提高了气井带压作业技术能力及作业效率,增产效果明显。研究认为,形成的气井带压作业关键技术为常规气井修井、页岩气井大规模完井提供了有力的技术支撑。

关键词: 气井带压作业技术, 环空动密封, 管柱内密封, 防管柱飞出, 防压弯管柱

Abstract: At present, gas well snubbing operation is an important completion and workover technology in the global gas field development, which enables to avoid reservoir damage caused by conventional well killing operation, and has outstanding technical advantages such as reservoir protection, cost reduction and efficiency improvement. In view of the prominent technical problems such as short service life of annulus motive sealing wear-resistant parts in gas well snubbing operation, low pressure grade of inner pipe string sealing tools, and high risk of pipe string flying out and bending, research has been conducted on four aspects, including pressure control technology of annulus motive seal, pressure control technology of inner pipe string sealing, anti-pipe string flying out technology and anti-pressure bending technology. The motive sealing wear-resistant parts with a service life of over 1200m at the wellhead pressure of 35MPa have been developed, as well as the inner pipe string sealing tools at a pressure of 70MPa. The calculation formula of neutralization point and the calculation model of ultimate bending length of pipe strings have been established. The research results have successfully broken through technical bottlenecks such as annular motive sealing and inner pipe string sealing, and formed key technology of gas well snubbing operation, which have been applied for more than 1000 wells in PetroChina Changning-Weiyuan, Changqing Oilfield and Sinopec Fuling blocks, greatly improving the technical capability and efficiency of snubbing operation in gas wells, and obtaining significant results of production increase. The research shows that the key technology of gas well snubbing operation provides powerful technical support for conventional gas well workover and large-scale completion of shale gas wells.

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