Principle of a self-protective sealing device for MWD and its influencing factors
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摘要: 为适应钻孔深度越来越深要求,延长随钻测量工作寿命,针对组合静密封结构缺陷,设计一种适用于随钻测量仪器的自保护密封装置。通过静力学膨胀数值模拟对橡胶气囊膨胀位移与气压关系进行研究,并在此基础上对模型尺寸大小不同,结果不同原因进行分析,讨论造成自保护密封装置模拟结果不同的因素,确定气囊直径、宽度、壁厚和内腔宽度4个自变量,并对4个自变量进行模拟,探究其与橡胶气囊膨胀关系;在静力学膨胀模拟基础上,建立自保护密封简易模型,通过流体数值模拟对其密封效果进行分析。结果表明:自保护密封装置橡胶气囊膨胀位移大小与压力成线性关系,橡胶气囊膨胀位移比
$ k $ 与气囊直径和宽度呈二次函数关系,与气囊内腔宽度和壁厚成反比且橡胶气囊内外圈膨胀位移比$ k $ 大小不同,并随着自变量参数增大,外圈膨胀位移比$ k $ 逐渐小于内圈,可推导出橡胶气囊结构尺寸存在膨胀位移比$ k $ 最大的临界值; 在自保护密封装置保护下,自保护密封简易模型内部无水流动轨迹,证明了自保护密封装置可靠。橡胶气囊结构尺寸临界值的存在为设计在仪器空间有限情况下达到最佳密封效果的自保护密封装置尺寸提供依据。Abstract: For deeper drilling depth and longer service life of MWD, a self-protection sealing device for the MWD instrument is designed given the defects of the combined static sealing structure. The relationship between rubber airbag expansion displacement and air pressure was studied through static expansion numerical simulation. On this basis, the reasons for different results due to different model sizes were analyzed, and the factors causing the different simulation results of the self-protection sealing device were discussed. The four independent variables of airbag diameter, width, wall thickness and inner cavity width were determined and simulated to explore their relationship with the rubber airbag expansion. Based on the static expansion simulation, a simple model of self-protection seal was established, and its sealing effect was simulated by fluid numerical simulation. The results show that the expansion displacement of the rubber airbag of the self-protection sealing device has a linear relationship with the pressure. The expansion displacement ratio$ k $ of the rubber airbag has a quadratic function relationship with the diameter and width of the airbag, and is inversely proportional to the inner cavity width and wall thickness of the airbag. The expansion displacement ratio$ k $ of the inner and outer rings of the rubber airbag is different, and with the increase of the independent variable parameters, the expansion displacement ratio$ k $ of the outer ring is gradually smaller than that of the inner ring. It can be deduced that there is a critical value of the structural size of the rubber airbag to reach the maximum expansion displacement ratio$ k $ . Under the protection of the self-protection sealing device, the fact that there is no water flow trajectory inside the simple self-protection sealing model proves that the self-protection sealing device is reliable. The critical value of the rubber airbag structure size provides a basis for designing the size of the self-protection sealing device to achieve the best sealing effect under the condition of the limited instrument space.-
Key words:
- MWD /
- self-protection /
- sealing device /
- airbag inflation /
- numerical simulation /
- factor affecting expansion
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表 1 自保护密封装置结构参数
Table 1 Structural parameters of the self-protective sealing device
mm 模型 内径 壁厚 内腔宽度 气囊宽度 外径 模型1 33 0.3 2.55 3 40 模型2 29 0.5 4.25 5 40 表 2 不同气压下自保护密封装置膨胀位移
Table 2 Expansion displacement of the self-protective sealing device under different air pressures
气压/MPa 膨胀位移/mm 模型1 模型2 0.1 1.21 0.83 0.2 2.41 1.65 0.3 3.61 2.48 0.4 4.81 3.31 0.5 6.02 4.14 1.0 12.03 8.27 1.5 18.04 12.41 2.0 24.06 16.54 表 3 橡胶气囊膨胀自变量参数
Table 3 Independent variable parameters of rubber airbag expansion
mm 自变量 气囊直径 气囊宽度 内腔宽度 气囊壁厚 气囊1 24 3.0 2.4 0.3 气囊2 28 3.5 2.8 0.6 气囊3 32 4.0 3.2 0.9 气囊4 36 4.5 3.6 1.2 气囊5 40 5.0 4.0 1.5 -
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