Hydrate dissociation induced by gas diffusion from pore water to drilling fluid in a cold wellbore

Authors

  • Youhong Sun Key Laboratory of Drilling and Exploitation Technology in Complex Conditions of Ministry of Land and Resources,College of Construction Engineering, Jilin University, Changchun 130026, P. R. China
  • Hongfeng Lu Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, P. R. China
  • Cheng Lu Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, P. R. China
  • Shengli Li* Key Laboratory of Drilling and Exploitation Technology in Complex Conditions of Ministry of Land and Resources, College of Construction Engineering, Jilin University, Changchun 130026, P. R. China （Email：lishengli@jlu.edu.cn）
  • Xiaoshu Lv Department of Civil and Structural Engineering, School of Engineering, Aalto University, PO Box 12100, FIN-02015, Finland

Keywords:

Gas hydrate dissociation, model, gas diffusion, pore water, wellbore stability

Abstract

It is a common view that the high temperature of the drilling fluid can lead to the dissociation of gas hydrate during drilling through hydrate-bearing sediments. This study indicates that the hydrate dissociation in wellbore can also be induced by gas diffusion from pore water to drilling fluid even if the temperature (and the pressure if necessary) of the drilling fluid is well controlled to keep the conditions of hydrate-bearing sediments along the hydrate equilibrium boundary. The dissociation of gas hydrate was modelled based on Fick's first law. It was found that the dissociation rate mainly depended on the temperature of the sediments. The locations of dissociation front of CH4 hydrate and CO2 hydrate in wellbore were calculated as a function of time. The impacts of the hydrate dissociation on the wellbore stability and the resistivity well logging in sediments were evaluated.

Cited as: Sun, Y., Lu, H., Lu, C., Li, S., Lv, X. Hydrate dissociation induced by gas diffusion from pore water to drilling fluid in a cold wellbore. Advances in Geo-Energy Research, 2018, 2(4): 410-417, doi: 10.26804/ager.2018.04.06

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Published

2018-08-24

Issue

Vol. 2 No. 4 (2018): Decemeber

Section

Articles