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保压取心钻具的球阀机构,探索其动力学特性,优化球阀机构,增加其密封可靠性。分析结果表明,随着关闭推力的增大,球阀关闭时间缩短,产生的振动增大,易造成密封失效,需选择较小的推力提高密封的可靠性;随着接触面摩擦系数的降低,产生的振动反而增加;翻转到位后球阀在30 MPa条件下,其应力、应变皆在球阀的许可范围内,满足使用需求。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的意义。
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,and increase its sealing reliability.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,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 and the maximum strain 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.
作者
韩泽龙
李小洋
赵明
宋刚
张欣
蒋亚峰
田英英
HAN Zelong;LI Xiaoyang;ZHAO Ming;SONG Gang;ZHANG Xin;JIANG Yafeng;TIAN Yingying(Institute of Exploration Techniques,CAGS,Langfang Hebei 065000,China;China University of Geosciences,Wuhan Hubei 430074,China;Langfang Juli Exploration Technology Co.,Ltd.,Langfang Hebei 065000,China)
出处
《钻探工程》
2024年第6期32-38,共7页
Drilling Engineering
基金
国家自然科学基金项目“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”(编号:42102352)
国家重点研发计划项目“天然气水合物勘查开发技术联合研究”(编号:2018YFE0208200)。
关键词
保压取心钻具
球阀
推力
摩擦系数
振动
可靠性
pressure coring
ball valve
thrust force
friction coefficient
vibration
reliability
