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文23储气库封堵井完整性保障技术

吴俊霞 伊伟锴 孙鹏 刘欢乐

吴俊霞,伊伟锴,孙鹏,等. 文23储气库封堵井完整性保障技术[J]. 石油钻探技术,2022, 50(5):57-62 doi: 10.11911/syztjs.2022027
引用本文: 吴俊霞,伊伟锴,孙鹏,等. 文23储气库封堵井完整性保障技术[J]. 石油钻探技术,2022, 50(5):57-62 doi: 10.11911/syztjs.2022027
WU Junxia, YI Weikai, SUN Peng, et al. Integrity assurance technologies for plugged wells in Wen 23 Gas Storage [J]. Petroleum Drilling Techniques,2022, 50(5):57-62 doi: 10.11911/syztjs.2022027
Citation: WU Junxia, YI Weikai, SUN Peng, et al. Integrity assurance technologies for plugged wells in Wen 23 Gas Storage [J]. Petroleum Drilling Techniques,2022, 50(5):57-62 doi: 10.11911/syztjs.2022027

文23储气库封堵井完整性保障技术

doi: 10.11911/syztjs.2022027
基金项目: 中国石化科技攻关项目 “文23储气库井筒完整性评价技术与标准研究”(编号:PE19015 )部分研究内容
详细信息
    作者简介:

    吴俊霞(1969—),女,河南遂平人,1994年毕业于江汉石油学院采油工程专业,高级工程师,主要从事现代完井工程方面的研究工作。E-mail: wujx.sripe@sinopec.com。

  • 中图分类号: TE822

Integrity Assurance Technologies for Plugged Wells in Wen 23 Gas Storage

  • 摘要:

    文23储气库属于枯竭砂岩气藏型储气库,建设前需要对无法再利用的老井进行封堵。为确保老井的封堵质量,保障储气库的完整性,引入挪威石油工业协会井筒完整性技术标准的井筒完整性设计理念,识别了文23储气库老井封堵前后的窜漏风险状况,设计了井屏障系统,研发了适用于高温气层的耐高温缓膨气密封封堵体系,制定了确保封堵老井井筒完整性的工艺,形成了以井屏障设计、施工和监控为基础的井筒完整性保障技术。文23储气库老井采用该技术进行封堵,现场施工成功率100%,老井封堵后的井筒完整性良好,经受住多轮次注采交变应力的长期作用。研究和现场应用结果表明,根据井筒完整性设计理念进行井筒完整性设计和施工,可以确保老井封堵后井筒长期的完整性,也可为类似储气库设计提供借鉴。

     

  • 图 1  文23储气库封堵井窜漏通道示意

    Figure 1.  Channeling and leakage channels in plugged well in Wen 23 Gas Storage

    图 2  文23储气库老井封堵后的井屏障

    Figure 2.  Well barrier after plugging of old well in Wen 23 Gas Storage

    图 3  稠化时间与缓凝剂加量的关系

    Figure 3.  Relationship between thickening time and retarder dosage

    图 4  稠化时间、抗压强度与胶凝固化剂加量的关系

    Figure 4.  Relationships of thickening time and compressive strength with dosage of gelling curing agent

    图 5  滞留面积与网架结构形成剂加量的关系

    Figure 5.  Relationship between retention area and dosage of grid structure forming agent

    图 6  气体突破压力与微膨胀剂加量的关系

    Figure 6.  Relationship between gas breakthrough pressure and dosage of micro-swelling agent

    表  1  封堵目的层要求

    Table  1.   Plugging requirements for the target layers

    井段状况措施
    储气层底界以
    下100 m内
    已射孔 封堵合格后,进行下步作业
    未射孔 固井质量合格,在储层底界以下100 m套管内打水泥塞;固井质量不合格,在该井段内射孔进行二次固井,再在储气层底界以下100 m井筒内打水泥塞
    储气层已射孔 先采用挤注水泥的方式封堵射孔段,封堵半径0.50~2.00 m,并在射孔段井筒中打水泥塞,水泥塞长度在储气层顶界以上不少于300 m,同时水泥塞应覆盖储气层段,其长度要达100 m以上
    未射孔 在储气层段对应的套管打水泥塞,水泥塞覆盖储气层段长度达100 m以上
    储气层以上
    100 m内
    射孔且无套管漏失 在封堵储气层所留水泥面上坐封桥塞,然后在桥塞上打水泥塞,水泥塞长度要达到100 m以上;水泥塞上注防腐加重钻井液至井口
    未射孔或套管漏失 先在封堵层段以下坐封桥塞,挤水泥封堵后,再在井筒内打水泥塞,水泥塞长度要达100 m以上;水泥塞上注防腐加重钻井液至井口
    下载: 导出CSV

    表  2  超细水泥与普通封堵剂粒度分析结果

    Table  2.   Particle size analysis results of superfine cement and ordinary plugging agent

    封堵剂粒度中值/
    μm
    粒径范围/
    μm
    不同粒径占比,%
    3~30 μm>60 μm
    超细水泥 4.4520.25~262.3771.1 5.0
    普通封堵剂20.2111.98~451.5562.016.0
    下载: 导出CSV
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  • 收稿日期:  2021-11-09
  • 修回日期:  2022-06-07

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