Open Access Articles


Contact Us

Ausasia Science and Technology Press, Australia

Press address: Unit 3/3 Peace St, Box Hill South, Melbourne, Victoria 3128, Australia

Press email: ausasia.info@gmail.com

Press phone: 0421672696

Journal office email: ager2017@126.com

Our Visitors

206201 visitors Look details

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

Youhong Sun, Hongfeng Lu, Cheng Lu, Shengli Li, Xiaoshu Lv

(Published: 2018-08-24)


Corresponding Author and Email:Shengli Li, lishengli@jlu.edu.cn


Citation: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.


Article Type:Original article


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.


Keywords:Gas hydrate dissociation, model, gas diffusion, pore water, wellbore stability.


Views:858
Downloads:226



Download this Manuscript:PDF

Copyright ©2016. All Rights Reserved
Website: www.yandy-ager.com
E-mail: ager2017@126.com
鄂ICP备17029718号-1