石油学报 ›› 2018, Vol. 39 ›› Issue (3): 335-340,364.DOI: 10.7623/syxb201803009

• 石油工程 • 上一篇    下一篇

深水井筒环空圈闭压力单向控制机理

于晓聪1,2, 杨进3, 阚长宾1,3, 胡昌蓬4, 吴旭东5, 许发宾5, 张超5, 李磊5, 黄亮5   

  1. 1. 西安石油大学石油工程学院 陕西西安 710065;
    2. 西北工业大学航空学院 陕西西安 710072;
    3. 中国石油大学海洋工程研究院 北京 102249;
    4. 中国石油技术开发公司 北京 100009;
    5. 中海石油(中国)有限公司湛江分公司 广东湛江 524057
  • 收稿日期:2017-04-27 修回日期:2018-01-26 出版日期:2018-03-25 发布日期:2018-04-10
  • 通讯作者: 阚长宾,男,1981年2月生,2006年获中国石油大学(华东)学士学位,现为中国石油大学(北京)博士研究生,主要从事深水油气井钻井技术及深水钻完井工具研究。Email:kchangbin@163.com
  • 作者简介:于晓聪,女,1981年12月生,2006年获中国石油大学(华东)学士学位,现为西北工业大学航空学院博士研究生,主要从事油气田开发技术及深水油气开发研究。Email:niker124@163.com
  • 基金资助:

    国家自然科学基金项目"海洋深水浅层钻井关键技术基础理论研究"(No.51434009)和国家自然科学基金项目"深水油气井导管全寿命周期承载力演化机理研究"(No.51774301)资助。

Unidirectional control mechanism of annulus trapped pressure in deepwater shaft

Yu Xiaocong1,2, Yang Jin3, Kan Changbin1,3, Hu Changpeng4, Wu Xudong5, Xu Fabin5, Zhang Chao5, Li Lei5, Huang Liang5   

  1. 1. College of Petroleum Engineering, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
    2. School of Aeronautics, Northwestern Polytechnical University, Shaanxi Xi'an 710072, China;
    3. Research Institute of Ocean Engineering, China University of Petroleum, Beijing 102249, China;
    4. China Petroleum Technology & Development Corporation, Beijing 100009, China;
    5. Zhanjiang Branch, CNOOC China Limited Guangdong Zhanjiang 524057, China
  • Received:2017-04-27 Revised:2018-01-26 Online:2018-03-25 Published:2018-04-10

摘要:

深水油气井水下完井技术条件下,多级中间套管的环空圈闭压力是影响深水井筒完整性的关键因素之一。为有效控制油气生产或测试过程中圈闭压力对井筒安全性的威胁,开发了一种深水井筒环空圈闭压力单向控制技术。以南海深水油气典型井的井身结构为设计依据,研究了深水井筒生产测试过程的圈闭空间压力单向释放与控制工艺技术方法;构建了单向控制技术的室内实验模拟系统,实验模拟了井筒产出热流体对圈闭空间内圈闭液体温度、压力的影响。基于所设计的环空圈闭压力单向控制的方法,研制了一套压力单向控制的套管短节工具,并对压力单向控制套管短节工具的原理样机进行了室内模拟实验。实验结果表明,圈闭压力单向控制的方法可有效降低圈闭热应力异常升高而导致的套管变形、井口密封破坏等井筒安全事故的发生。圈闭空间的单向控制技术可有效保护深水井筒完整性,同时为深水圈闭压力的控制提供了安全方法。

关键词: 深水完井, 环空圈闭压力, 单向控制, 套管工具, 实验研究

Abstract:

Under the condition of underwater completion technology for deep water oil and gas wells, the annulus trapped pressure of multistage intermediate casing is one of the key factors affecting the integrity of deep water shaft. To effectively control the threat of trapped pressure to shaft safety during hydrocarbon production or testing process, a unidirectional control technology of annulus trapped pressure in deep water shaft was developed. According to the wellbore structure of typical deepwater hydrocarbon wells in the South China Sea as the design basis, a research was performed on the unidirectional release and control technology of trapped space pressure in the production and test process of deepwater shaft. An indoor experiment simulation system of unidirectional control technology was constructed to simulate the influences of shaft thermal fluid on the trapped liquid temperature and pressure. Based on the unidirectional control method of annulus trapped pressure, a set of casing nipples for unidirectional pressure control was developed. Then laboratory simulation experiments were carried out on the principle prototype of casing nipples for unidirectional pressure control. The results show that the unidirectional control method of trap pressure can effectively reduce the casing deformation caused by abnormal increase of trap thermal stress, wellhead sealing failure and other shaft safety accidents. This technology can not only effectively protect the integrity of deep water shaft, but also offer a safety method to control the deepwater trapped pressure.

Key words: deep water completion, annulus trapped pressure, unidirectional control, casing tool, experimental research

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