保压取心钻具球阀工作动力学分析
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1.中国地质科学院勘探技术研究所,河北 廊坊 065000;2.中国地质大学(武汉),湖北 武汉 430074;3.廊坊聚力勘探科技有限公司,河北 廊坊 065000

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:国家自然科学“海洋天然气水合物保压取样球阀密封失效机理及优化设计研究”(项目编号:42102352)和国家重点研发计划“天然气水合物勘查开发技术联合研究”(项目编号:2018YFE0208200)联合资助。


Analysis of working dynamics of ball valve with pressure core sampler
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Affiliation:

1.Institute of Exploration Techniques, CAGS, Langfang Hebei 065000, China;2.China University of Geosciences, Wuhan Hubei 430074, China;3.Langfang Juli Exploration Technology Co., Ltd., Langfang Hebei 065000, China

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    摘要:

    保压取心技术可以使取出的岩心保持在原位状态下,最大限度地减少岩心重要数据的丢失,进而准确获取地下矿产资源储量和地层参数。本文利用数值模拟研究了保压取心工具的球阀机构,探索其动力学特性,优化球阀机构。分析结果表明,随着上阀座推力的增大,球阀关闭时间越短,但产生的振动增大,易造成密封失效,因此可选择较小的推力有助于提高球阀密封的可靠性;随着接触面摩擦系数的降低,球阀翻转关闭时间也随之减小,但产生的振动随之加剧,增加了球阀泄漏的风险;翻转到位后球阀在30MPa条件下,最大接触应力为133.67MPa,最大应变为0.0328,其应力、应变皆在球阀的许可范围内。该项研究对于指导球阀机构的优化设计及提高其工作可靠性具有重要意义。

    Abstract:

    The pressure holding coring technology can keep the extracted core under in-situ condition, minimize the loss of important data in the core, and then accurately obtain important formation parameters which can calculate the reserves of mineral resources. In this paper, the ball valve mechanism of pressure core sampler is studied by numerical simulation, and its dynamic characteristics are explored to optimize the ball valve mechanism. The results show that with the increasing of thrust force on the ball valve, the shorter the closing time of ball valve, but the vibration generated increases, which is easy to cause seal failure. Thus, the small thrust force is selected to help improve the sealing reliability. With the decreasing of friction coefficient, the ball valve closing time also decreases. However, the vibration generated increases, making the leakage risk of ball valve much bigger. When the ball valve is closed, the pressure simulation of 30MPa is conducted. The maximum contact stress is 133.67MPa and the maximum strain is 0.0328, which are both within the allowable range of ball valve.This study are meaningful to guide the optimal design of ball valve mechanism and improve its working reliability.

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  • 收稿日期:2024-01-03
  • 最后修改日期:2024-05-08
  • 录用日期:2024-05-15
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