Study on the Shearing Force of Ram and Fracture Characteristics of Drillpipe Under Precutting

IF 3.2 3区工程技术 Q1 ENGINEERING, PETROLEUM

SPE Journal Pub Date : 2024-02-01 DOI:10.2118/219482-pa

Shihong Xiao, Maolin Xiang, Jun Guo, Jiakai Cui, Qiulin Tang, Junjie Jiang

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引用次数: 0

Abstract

The working pressure of the hydraulic system, as well as the volume and weight of the ram blowout preventer (BOP), cannot be increased excessively. This limitation affects the shearing force provided by the hydraulic cylinder of the BOP. When shearing high-strength, large-thickness, and large-diameter drillpipes, it is easy to cause shear failure, making blowout control challenging. Therefore, we proposed a high-pressure water-jet-assisted precutting method to reduce the force required to shear the drillpipe. Based on the numerical model verified by experiments, we compared and analyzed the shearing force variations and drillpipe fracture characteristics under different precutting methods. We also provided recommendations for selecting precutting methods. Furthermore, we identified the weights and grades of drillpipes that affect the shearing force under precutting. The results demonstrate that precutting the drillpipe can reduce shear forces, shorten fracture time, and improve fracture quality. The use of water-jet precutting technology enhances the efficiency of emergency well shut-in operations and subsequent pipe fishing. The presented technology is currently at a prefeasibility stage, and further efforts are needed to implement these ideas in practice.

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预切削下钻杆的柱塞剪切力和断裂特性研究

液压系统的工作压力以及柱塞式防喷器（BOP）的体积和重量不能过度增加。这一限制会影响 BOP 液压缸提供的剪切力。在剪切高强度、大厚度和大直径钻杆时，很容易造成剪切失效，给井喷控制带来挑战。因此，我们提出了一种高压水射流辅助预切割方法，以减少剪切钻杆所需的力。基于实验验证的数值模型，我们对比分析了不同预切割方法下的剪切力变化和钻杆断裂特征。我们还提供了选择预切割方法的建议。此外，我们还确定了影响预切割下剪切力的钻杆重量和等级。结果表明，钻杆预切割可以降低剪切力，缩短压裂时间，提高压裂质量。使用喷水预切割技术可提高紧急关井作业和后续捞管的效率。所介绍的技术目前还处于预可行性阶段，需要进一步努力将这些想法付诸实践。

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来源期刊

SPE Journal 工程技术-工程：石油

CiteScore

7.20

自引率

11.10%

发文量

229

审稿时长

4.5 months

期刊介绍： Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.