Paper Title:
Numerical Simulations of Drilling Mud Invasion into the Marine Gas Hydrate-Bearing Sediments
  Abstract

When drilling through the oceanic gas hydrate-bearing sediments, the water-based mud under overbalanced drilling condition will invade into the borehole sediments. The invasion behavior can influence the hydrate stability, wellbore stability and well logging evaluation. In this work, we performed the numerical simulations to study the effects of density (i.e., corresponding pressure), temperature and salinity of mud on the mud invasion and hydrate stability around borehole. The results show that the mud invasion will promote greatly the hydrate dissociation near wellbore sediments if the temperature of mud is higher than that of hydrate stability. Under certain conditions, the higher mud density, temperature and salinity, the greater degree of mud invasion and heat transfer, and the more hydrate dissociation. The gas produced from hydrate dissociation can reform hydrates again in the sediments, and even the hydrate saturation is higher than that in situ sediments due to the displacing effect of the mud invasion, which forms a high-saturation hydrate girdle band around the borehole.

  Info
Periodical
Chapter
Chapter 2: Material Science and Manufacturing Technology
Edited by
Helen Zhang and David Jin
Pages
378-387
DOI
10.4028/www.scientific.net/AMR.366.378
Citation
F. L. Ning, Y. B. Yu, G. S. Jiang, X. Wu, K. N. Zhang, L. Zhang, L. Liu, "Numerical Simulations of Drilling Mud Invasion into the Marine Gas Hydrate-Bearing Sediments", Advanced Materials Research, Vol. 366, pp. 378-387, 2012
Online since
October 2011
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$32.00
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