Principle of a self-protective sealing device for MWD and its influencing factors

Authors

WANG Yaoming, China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, ChinaFollow
YE Genfei, College of Construction Engineering, Jilin University, Changchun 130015, China
ZHAO Yongzhe, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
GAO Ke, College of Construction Engineering, Jilin University, Changchun 130015, ChinaFollow
LIU Weiwei, Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
DUAN Huijun, China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China

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.

Keywords

MWD, self-protection, sealing device, airbag inflation, numerical simulation, factor affecting expansion

DOI

10.12363/issn.1001-1986.21.11.0668

Recommended Citation

WANG Yaoming, YE Genfei, ZHAO Yongzhe, et al. (2022) "Principle of a self-protective sealing device for MWD and its influencing factors," Coal Geology & Exploration: Vol. 50: Iss. 4, Article 21.
DOI: 10.12363/issn.1001-1986.21.11.0668
Available at: https://cge.researchcommons.org/journal/vol50/iss4/21

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