Heterogeneities of seepage pore and fracture of high volatile bituminous coal core: implications on water invasion degree

Xin Li, Xuehai Fu, J. Tian, Weiming Guan, Xueliang Liu, Yanyan Ge, P. G. Ranjith, Wenfeng Wang, Meng Wang, Shun Liang

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

High volatile bituminous coal (HVBC) reservoirs are now regarded as one of the most important targets for coalbed methane (CBM) exploration and development in northwestern China. Water invasion during coalbed methane reservoir fracturing can induce water blockage damage, leading to decreased relative permeability of gas and reduced production of CBM well. To study the influences of heterogeneities of seepage pore and fracture on water invasion degree (WID), water flooding experiment using HVBC core was conducted to simulate water invasion; magnetic resonance imaging and gray calculation were applied to quantitatively determine WID; heterogeneous parameters of seepage pore and fracture were extracted based on micro-CT and fractal characterization; finally implications of seepage pore and fracture heterogeneities on WID were discussed, and water invasion mechanism was analyzed. The results show that fracture porosity, connected fracture porosity, minerals’ filling porosity, displacement pressure, efficiency of mercury withdrawal, and fractal dimension as well as tortuosity of seepage pore, are closely correlated with WID. As fracture porosity increases, WID initially increases then tends to be unchanged. Minerals’ filling can be dominated factor resisting water invasion when severe filling occurs. Seepage pores with good connection and permeability are beneficial for water invasion, while those with complex structure and tortuosity are detrimental to water invasion. Reservoirs developing connected fractures and homogeneous seepage pores are not only beneficial for water invasion, but also beneficial for water elimination. Reservoirs developing unconnected fractures and homogeneous seepage pores are beneficial for water invasion while detrimental to water elimination. Reservoirs lacking fractures’ development but developing complex structural seepage pores are detrimental to both water invasion and elimination.

Original languageEnglish
Article number106409
Number of pages13
JournalJournal of Petroleum Science and Engineering
Volume183
DOIs
Publication statusPublished - 1 Dec 2019

Cite this

Li, Xin ; Fu, Xuehai ; Tian, J. ; Guan, Weiming ; Liu, Xueliang ; Ge, Yanyan ; Ranjith, P. G. ; Wang, Wenfeng ; Wang, Meng ; Liang, Shun. / Heterogeneities of seepage pore and fracture of high volatile bituminous coal core : implications on water invasion degree. In: Journal of Petroleum Science and Engineering. 2019 ; Vol. 183.
@article{9e6c49b3287441e28687279353dd7d9f,
title = "Heterogeneities of seepage pore and fracture of high volatile bituminous coal core: implications on water invasion degree",
abstract = "High volatile bituminous coal (HVBC) reservoirs are now regarded as one of the most important targets for coalbed methane (CBM) exploration and development in northwestern China. Water invasion during coalbed methane reservoir fracturing can induce water blockage damage, leading to decreased relative permeability of gas and reduced production of CBM well. To study the influences of heterogeneities of seepage pore and fracture on water invasion degree (WID), water flooding experiment using HVBC core was conducted to simulate water invasion; magnetic resonance imaging and gray calculation were applied to quantitatively determine WID; heterogeneous parameters of seepage pore and fracture were extracted based on micro-CT and fractal characterization; finally implications of seepage pore and fracture heterogeneities on WID were discussed, and water invasion mechanism was analyzed. The results show that fracture porosity, connected fracture porosity, minerals’ filling porosity, displacement pressure, efficiency of mercury withdrawal, and fractal dimension as well as tortuosity of seepage pore, are closely correlated with WID. As fracture porosity increases, WID initially increases then tends to be unchanged. Minerals’ filling can be dominated factor resisting water invasion when severe filling occurs. Seepage pores with good connection and permeability are beneficial for water invasion, while those with complex structure and tortuosity are detrimental to water invasion. Reservoirs developing connected fractures and homogeneous seepage pores are not only beneficial for water invasion, but also beneficial for water elimination. Reservoirs developing unconnected fractures and homogeneous seepage pores are beneficial for water invasion while detrimental to water elimination. Reservoirs lacking fractures’ development but developing complex structural seepage pores are detrimental to both water invasion and elimination.",
author = "Xin Li and Xuehai Fu and J. Tian and Weiming Guan and Xueliang Liu and Yanyan Ge and Ranjith, {P. G.} and Wenfeng Wang and Meng Wang and Shun Liang",
year = "2019",
month = "12",
day = "1",
doi = "10.1016/j.petrol.2019.106409",
language = "English",
volume = "183",
journal = "Journal of Petroleum Science and Engineering",
issn = "0920-4105",
publisher = "Elsevier",

}

Heterogeneities of seepage pore and fracture of high volatile bituminous coal core : implications on water invasion degree. / Li, Xin; Fu, Xuehai; Tian, J.; Guan, Weiming; Liu, Xueliang; Ge, Yanyan; Ranjith, P. G.; Wang, Wenfeng; Wang, Meng; Liang, Shun.

In: Journal of Petroleum Science and Engineering, Vol. 183, 106409, 01.12.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Heterogeneities of seepage pore and fracture of high volatile bituminous coal core

T2 - implications on water invasion degree

AU - Li, Xin

AU - Fu, Xuehai

AU - Tian, J.

AU - Guan, Weiming

AU - Liu, Xueliang

AU - Ge, Yanyan

AU - Ranjith, P. G.

AU - Wang, Wenfeng

AU - Wang, Meng

AU - Liang, Shun

PY - 2019/12/1

Y1 - 2019/12/1

N2 - High volatile bituminous coal (HVBC) reservoirs are now regarded as one of the most important targets for coalbed methane (CBM) exploration and development in northwestern China. Water invasion during coalbed methane reservoir fracturing can induce water blockage damage, leading to decreased relative permeability of gas and reduced production of CBM well. To study the influences of heterogeneities of seepage pore and fracture on water invasion degree (WID), water flooding experiment using HVBC core was conducted to simulate water invasion; magnetic resonance imaging and gray calculation were applied to quantitatively determine WID; heterogeneous parameters of seepage pore and fracture were extracted based on micro-CT and fractal characterization; finally implications of seepage pore and fracture heterogeneities on WID were discussed, and water invasion mechanism was analyzed. The results show that fracture porosity, connected fracture porosity, minerals’ filling porosity, displacement pressure, efficiency of mercury withdrawal, and fractal dimension as well as tortuosity of seepage pore, are closely correlated with WID. As fracture porosity increases, WID initially increases then tends to be unchanged. Minerals’ filling can be dominated factor resisting water invasion when severe filling occurs. Seepage pores with good connection and permeability are beneficial for water invasion, while those with complex structure and tortuosity are detrimental to water invasion. Reservoirs developing connected fractures and homogeneous seepage pores are not only beneficial for water invasion, but also beneficial for water elimination. Reservoirs developing unconnected fractures and homogeneous seepage pores are beneficial for water invasion while detrimental to water elimination. Reservoirs lacking fractures’ development but developing complex structural seepage pores are detrimental to both water invasion and elimination.

AB - High volatile bituminous coal (HVBC) reservoirs are now regarded as one of the most important targets for coalbed methane (CBM) exploration and development in northwestern China. Water invasion during coalbed methane reservoir fracturing can induce water blockage damage, leading to decreased relative permeability of gas and reduced production of CBM well. To study the influences of heterogeneities of seepage pore and fracture on water invasion degree (WID), water flooding experiment using HVBC core was conducted to simulate water invasion; magnetic resonance imaging and gray calculation were applied to quantitatively determine WID; heterogeneous parameters of seepage pore and fracture were extracted based on micro-CT and fractal characterization; finally implications of seepage pore and fracture heterogeneities on WID were discussed, and water invasion mechanism was analyzed. The results show that fracture porosity, connected fracture porosity, minerals’ filling porosity, displacement pressure, efficiency of mercury withdrawal, and fractal dimension as well as tortuosity of seepage pore, are closely correlated with WID. As fracture porosity increases, WID initially increases then tends to be unchanged. Minerals’ filling can be dominated factor resisting water invasion when severe filling occurs. Seepage pores with good connection and permeability are beneficial for water invasion, while those with complex structure and tortuosity are detrimental to water invasion. Reservoirs developing connected fractures and homogeneous seepage pores are not only beneficial for water invasion, but also beneficial for water elimination. Reservoirs developing unconnected fractures and homogeneous seepage pores are beneficial for water invasion while detrimental to water elimination. Reservoirs lacking fractures’ development but developing complex structural seepage pores are detrimental to both water invasion and elimination.

UR - http://www.scopus.com/inward/record.url?scp=85071235202&partnerID=8YFLogxK

U2 - 10.1016/j.petrol.2019.106409

DO - 10.1016/j.petrol.2019.106409

M3 - Article

AN - SCOPUS:85071235202

VL - 183

JO - Journal of Petroleum Science and Engineering

JF - Journal of Petroleum Science and Engineering

SN - 0920-4105

M1 - 106409

ER -