Research on Drilling Tool Wear and Anti-Wear Technology for Hot Dry Rock Drilling
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摘要: 为了明确干热岩钻井过程中的钻具磨损机理，并采取合适的防磨技术方案来降低钻具磨损，首先分析了井眼内钻柱的运动状态，描述了钻柱与井壁的接触关系，并采用有限单元法建立了钻柱动力学有限元理论分析模型；然后以某干热岩典型实钻井为例，通过求解钻柱动力学模型，分析了钻具与井壁的接触状态；最后以降低钻具与井壁间的接触作用力为目标，探讨了钻具组合和钻进参数对钻具动态特性的影响规律，并进行了钻具组合优化和钻进参数优选，给出了钻具组合、钻进参数防磨推荐技术方案。该防磨技术在某干热岩井钻井作业中进行了试验，进尺116.00 m，稳定器外径磨损3.0 mm，取得了较好的钻具防磨效果。研究给出的钻具组合、钻进参数防磨技术方案，为解决干热岩钻井钻具磨损问题提供了新的技术手段。Abstract: In order to clarify the wear mechanism of drilling tools during hot dry rock drilling and propose an appropriate anti-wear technical scheme to alleviate the wear of drilling tools, the motion state of drilling string in the wellbore was first analyzed and the contact relationship between the drilling string and the sidewall was described. Furthermore, the finite element method was used to establish a model for analyzing the drilling string dynamics. Later, by taking the drilling of a typical hot dry rock well as an example, the contact state between the drilling tool and the sidewall was analyzed by solving the dynamic model of the drilling string. Finally, with the goal of reducing the contact force between drilling tool and sidewall, the influence law of BHA (bottom hole assembly) and drilling parameters on the dynamic characteristics of drilling tools were analyzed. In addition, the recommended anti-wear technical scheme of BHA and drilling parameters was proposed through the optimization of BHA and drilling parameters. The technical scheme was then tested and applied in on-site hot dry rock drilling. After drilling 116.00 m, the stabilizer was worn by only 3.0 mm, indicating that a good anti-wear effect was obtained. This technical scheme can provide a new solution to alleviate drilling tool wear in hot dry rock drilling.
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Keywords:
- hot dry rock /
- drilling tool /
- wear /
- bottom hole assembly /
- motion state /
- contact force
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图 3 不同位置处钻柱与井壁间的接触压力分布
Figure 3. Distribution of the contact force between drilling string and sidewall at different positions
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图 8 不同转速下稳定器的运动状态
Figure 8. Motion states of the stabilizer under different rotary speeds
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图 9 不同转速下稳定器与井壁的动态接触压力
Figure 9. Dynamic contact force between stabilizer and sidewall under different rotary speeds
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