Spiral Slip Structural Design for Ultra-Small Diameter Dissolvable Bridge Plug in Hydraulic Fracturing of Casing Deformation Wells

Yu Chenggang; Yang Jian; Fu Yukun; Wang Kang; Jiang Jie; Shi Changshuai; Mei Lei

doi:10.12473/CPM.202503087

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Spiral Slip Structural Design for Ultra-Small Diameter Dissolvable Bridge Plug in Hydraulic Fracturing of Casing Deformation Wells

THEMATIC PAPER | 更新时间：2026-01-19

- Spiral Slip Structural Design for Ultra-Small Diameter Dissolvable Bridge Plug in Hydraulic Fracturing of Casing Deformation Wells
- China Petroleum Machinery Vol. 53, Issue 10, Pages: 72-78(2025)
- 作者机构：
  
  1.中国石油西南油气田分公司工程技术研究院
  2.西南石油大学机电工程学院
- 作者简介：
- 基金信息：
- DOI：10.12473/CPM.202503087
  CLC： TE925
- Received：24 March 2025，
  
  Revised：2025-06-15，
  
  Published：10 October 2025
- 稿件说明：
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喻成刚，杨建，付玉坤，等.套管变形井压裂用超小直径可溶桥塞螺旋卡瓦结构设计［J］.石油机械，2025，53（10）：72-78.

Yu Chenggang，Yang Jian，Fu Yukun，et al.Spiral slip structural design for ultra⁃small diameter dissolvable bridge plug in hydraulic fracturing of casing deformation wells［J］.China Petroleum Machinery，2025，53（10）：72-78.
喻成刚，杨建，付玉坤，等.套管变形井压裂用超小直径可溶桥塞螺旋卡瓦结构设计［J］.石油机械，2025，53（10）：72-78. DOI： 10.12473/CPM.202503087.

Yu Chenggang，Yang Jian，Fu Yukun，et al.Spiral slip structural design for ultra⁃small diameter dissolvable bridge plug in hydraulic fracturing of casing deformation wells［J］.China Petroleum Machinery，2025，53（10）：72-78. DOI： 10.12473/CPM.202503087.

摘要

随着四川盆地页岩气勘探开发逐步向深层迈进，地层温度压力更高、水平段更长、施工压力更大，套管变形井数量显著增加，套管变形程度也愈发严重。传统可溶桥塞受外径大小限制，在套管变形井下入时存在遇阻、遇卡等问题，导致不能顺利下放至目的层段，影响正常层段压裂施工作业。为此，设计了一种螺旋式卡瓦机构，建立小直径可溶桥塞+螺旋卡瓦+套管组合的有限元模型，并对螺旋卡瓦的螺距、圈数、旋向进行数值模拟分析与室内验证。研究结果表明：随着螺旋卡瓦螺距和圈数的增加，螺旋卡瓦最大锚定力均呈现减小趋势，螺旋卡瓦螺距推荐40 mm、螺旋卡瓦圈数推荐1圈；螺旋卡瓦旋向与螺旋胀锥旋向相反时，超小直径可溶桥塞的锚定性能更好；螺旋卡瓦最大锚定力为502.3 kN，可满足套管变形井条件下小直径锚定大环空的分段压裂需求。所得结论可为超小直径可溶性桥塞设计提供参考。

Abstract

As shale gas exploration and development in the Sichuan Basin progressively advances into deeper formations， the formation temperature and pressure become higher， the horizontal sections grow longer， and the operational pressures increase significantly. Consequently， there has been a notable rise in the number of casing deformation wells， and the degree of casing deformation is becoming more and more serious. Traditional dissolvable bridge plugs often encounter obstruction and sticking issues when running in casing deformation wells due to the limitation of their outside diameter， resulting in difficulties in smoothly lowering them to the target section and affecting normal staged fracturing operations. To address this issue， a spiral anchoring mechanism was designed， a finite element model of small-diameter dissolvable bridge plug + spiral slip + casing was established， and numerical simulation analysis and laboratory validation were conducted on the pitch， number of turns and thread orientation of the spiral slip. The study results show that as the pitch and number of turns of the spiral slip increase， the maximum anchoring force of the spiral slip shows a downward trend. The pitch of spiral slip is recommended to be 40 mm， and the number of turns of spiral slip is recommended to be 1. Meanwhile， when the thread orientation of the spiral slip is opposite to that of the spiral expansion cone， the anchoring performance of the ultra-small diameter dissolvable bridge plug is better. The maximum anchoring force of the spiral slip reaches 503.2 kN， meeting the requirements of staged fracturing in casing deformation wells where small-diameter anchoring in large annulus is needed. The conclusions drawn provide references for the design of ultra-small diameter dissolvable bridge plugs.

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