English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China

Wang, Y., Pan, M., Mayanna, S., Schleicher, A. M., Spangenberg, E., Schicks, J. (2020): Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China. - Applied Energy, 263, 114619.
https://doi.org/10.1016/j.apenergy.2020.114619

Item is

Basic

show hide
Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000685 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000685_4
Genre: Journal Article

Files

show Files
hide Files
:
5000685.pdf (Postprint), 3MB
Name:
5000685.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Wang, Yi1, Author              
Pan, Mengdi1, Author              
Mayanna, S.2, Author              
Schleicher, Anja Maria1, Author              
Spangenberg, Erik3, Author              
Schicks, J1, Author              
Affiliations:
13.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              
23.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_754888              
34.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146039              

Content

show
hide
Free keywords: Gas hydrate, Reservoir formation damage, Qilian Mountain, Hydrate dissociation, Gas production
 Abstract: Permeability is known as a key factor affecting the gas production effectiveness from the natural gas hydratebearing reservoir. We studied the permeability behavior of natural clayey sand core samples from a natural hydrate-bearing reservoir in the Qilian Mountain permafrost before and after hydrate formation, as well as after hydrate decomposition. We found a substantially lower permeability after hydrate decomposition and assumed a formation damage process involving fines mobilization, migration and deposition at pore throats. The assumption was proved by SEM analysis of the filter paper separating the sample and the end caps containing the fluid ports. The analysis showed fines trapped in the paper from the outlet side. Fines migration and resulting formation damage is known from enhanced oil recovery by low salinity water flooding, but was unexpected for hydrate decomposition. The underlying mechanism was identified by a series of different permeability tests. The results indicate that fresh water released from the hydrate dissociation causes the fines mobilization, migration and redeposition at pore throats leading to the observed permeability decrease. Obviously the large volume of released methane gas displaces the remaining saline water and separates it from the fresh water released from the hydrate. The fresh water in contact with parts of the grain framework causes the detachment of clay particles by increased electrostatic forces and clay swelling, if swellable clays are present. This is an important mechanism that has to be taken into account in the planning of gas production from low-permeability clayey hydratebearing formations.

Details

show
hide
Language(s): eng - English
 Dates: 2020-02-052020
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.apenergy.2020.114619
GFZPOF: p3 PT8 Oceans
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Applied Energy
Source Genre: Journal, SCI, Scopus, p3
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 263 Sequence Number: 114619 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/0910
Publisher: Elsevier