Volume 45 Issue 4
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ZHANG Biao, ZHANG Suian, DONG Yintao, SUN Yanming, DU Yao. Friction loss calculation and wellhead pressure prediction in CBM radial drilling[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(4): 170-174. DOI: 10.3969/j.issn.1001-1986.2017.04.030
Citation: ZHANG Biao, ZHANG Suian, DONG Yintao, SUN Yanming, DU Yao. Friction loss calculation and wellhead pressure prediction in CBM radial drilling[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(4): 170-174. DOI: 10.3969/j.issn.1001-1986.2017.04.030
shu

Friction loss calculation and wellhead pressure prediction in CBM radial drilling

  • Coalbed Methane Research Center of China University of Petroleum(Beijing), Beijing 102249, China

Funds: 

Shanxi Province Coal Fund Key Project(MQ2014-04)

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  • Received Date: March 12, 2016
  • Published Date: August 24, 2017
    Graphical Abstract
    • Abstract
  • The paper analyzed the pressure loss of drillpipe system for CBM radial drilling and high pressure water jet breaking mechanism, and listed the formula of various parts of resistance coefficient and nozzle jet power in drill pipe system, presented the relationship between hydraulic impact broken pressure and physical and mechanical parameters, and the relationship between hydraulic erosion velocity and dimensionless impact pressure by theoretical analysis and laboratory tests. The results show that the critical breaking pressure calculated by the weighted average method agrees with the measured values. At the 3~8 times critical breaking pressure, erosion rate is about 0.4 times as much as dimensionless impact pressure. According the requirements of construction, by pressure prediction step, the wellhead pressure of field operation was predicted, the predicted pressure was 3~5 MPa lower than construction pressure.
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