Imbibition is one of the main factors that reduces the fracturing efficiency and damages gas production in unconventional oil and gas wells, which is an important issue that has been valued in recent years. However, deficiencies still exist both in experimental tests and theory analysis, owing to the difference between reservoir conditions and current laboratory technology. Water imbibition in reservoirs is under the conditions of high pressure and high temperature, which is under the effects of complex water-gas occurrence state and multi-scale porous medium. Actually, it is difficult to reproduce these conditions in the laboratory. Meanwhile, the effects of water imbibition on unconventional oil and gas reservoirs are controversial. Some scholars believe that water imbibition can increase the desorption of adsorbed gas and shale permeability, but others think that water imbibition is deleterious for oil/gas production and estimated ultimate reserve.
The emerging new physical simulation methods mainly include microfluidic technology, high pressure and temperature dynamic displacement device and nuclear magnetic resonance technology, CT, while the latest theoretical approaches mainly include the expression of water imbibition in micro- and nanoscale pores covered with adsorbed gas and bound water, the clarification of water imbibition in through and blind pores and multi-scale pores, and the characterization of imbibition effects on reservoir and oil/gas production. These advancements are advantageous to reveal the actual reservoir state before water/gas/oil production and improve the measurements to reduce water damage and increase water benefit. The purpose of this Research Topic is to explore the advances in experimental and theoretical research on mechanism and affecting effects of water imbibition on unconventional oil and gas reservoirs.
This research topic will collect comprehensive review papers and research articles of any scientific work and fundamental study for water imbibition in unconventional oil and gas reservoirs. It will cover topics of interest that include, but are not limited to the following:
(1) Molecular simulation or experiment of gas-water competition adsorption
(2) Geological characterization and fluid occurrence state in unconventional gas/oil reservoirs
(3) Experiment and mathematical model of water imbibition
(4) Microscopic Water-gas displacement mechanism
(5) Visual observation for microflow in porous media
(6) Water-gas-rock reaction on unconventional gas/oil development
(7) Rock wettability characterization and its impact on nanoconfined flow
(8) The effect of flowback fracturing fluid on gas production
Imbibition is one of the main factors that reduces the fracturing efficiency and damages gas production in unconventional oil and gas wells, which is an important issue that has been valued in recent years. However, deficiencies still exist both in experimental tests and theory analysis, owing to the difference between reservoir conditions and current laboratory technology. Water imbibition in reservoirs is under the conditions of high pressure and high temperature, which is under the effects of complex water-gas occurrence state and multi-scale porous medium. Actually, it is difficult to reproduce these conditions in the laboratory. Meanwhile, the effects of water imbibition on unconventional oil and gas reservoirs are controversial. Some scholars believe that water imbibition can increase the desorption of adsorbed gas and shale permeability, but others think that water imbibition is deleterious for oil/gas production and estimated ultimate reserve.
The emerging new physical simulation methods mainly include microfluidic technology, high pressure and temperature dynamic displacement device and nuclear magnetic resonance technology, CT, while the latest theoretical approaches mainly include the expression of water imbibition in micro- and nanoscale pores covered with adsorbed gas and bound water, the clarification of water imbibition in through and blind pores and multi-scale pores, and the characterization of imbibition effects on reservoir and oil/gas production. These advancements are advantageous to reveal the actual reservoir state before water/gas/oil production and improve the measurements to reduce water damage and increase water benefit. The purpose of this Research Topic is to explore the advances in experimental and theoretical research on mechanism and affecting effects of water imbibition on unconventional oil and gas reservoirs.
This research topic will collect comprehensive review papers and research articles of any scientific work and fundamental study for water imbibition in unconventional oil and gas reservoirs. It will cover topics of interest that include, but are not limited to the following:
(1) Molecular simulation or experiment of gas-water competition adsorption
(2) Geological characterization and fluid occurrence state in unconventional gas/oil reservoirs
(3) Experiment and mathematical model of water imbibition
(4) Microscopic Water-gas displacement mechanism
(5) Visual observation for microflow in porous media
(6) Water-gas-rock reaction on unconventional gas/oil development
(7) Rock wettability characterization and its impact on nanoconfined flow
(8) The effect of flowback fracturing fluid on gas production