Effect of desiccation on shut-in benefits in removing water blockage in tight water-wet cores

Wijaya, Nur; Sheng, James J.

doi:10.1016/j.fuel.2019.01.180

Cited by 38 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the gas relative permeability showed a decline of 25.7% according to the rock relative permeability data. This is mainly because water invaded the low-pressure layer along with the gas back-flow and will have led to an increase in water saturation and to water block 28–30 . The closer they were to the outlet, the greater the influence of the back-flow, the greater the increase in water saturation, and the greater the decline in permeability.…”

Section: Resultsmentioning

confidence: 99%

Secondary formation damage of low-pressure layer during commingled production in multilayered tight gas reservoirs

Ding

Yan

et al. 2019

Sci Rep

View full text Add to dashboard Cite

This paper experimentally investigates fluid back-flow behavior and formation damage during commingled production in multilayered tight gas reservoirs. The development of fluid back-flow in commingled tight gas reservoirs was simulated using a newly designed experimental platform. The results indicate that when there is a pressure difference between different layers during commingled production from tight gas reservoir, water produced from the high-pressure layer will invade the low-pressure layer along with gas back-flow and will accumulate in the near-wellbore area. This will lead to an increase in water saturation and a decline in permeability in the low-pressure layer and result in a significant reduction in ultimate recovery. The outcomes of these experiments demonstrate that as well as the formation damage caused by the working fluid during drilling and fracturing, “Secondary Formation Damage” also occurs during commingled production in multilayered tight gas reservoirs. This secondary formation damage mainly occurs in the near-wellbore area of low-pressure layers and is more severe with greater proximity to the wellbore. Through further experimentation to assess the factors influencing secondary formation damage, it is shown that the degree of secondary formation damage increases with decreasing original formation pressure, original water saturation, and permeability in the lower-pressure layer.

show abstract

Section: Resultsmentioning

confidence: 99%

Secondary formation damage of low-pressure layer during commingled production in multilayered tight gas reservoirs

Ding

Yan

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…At present, the measures for handling water blocking mainly include shut-in, chemical additive application, and hydraulic fracturing. Wijaya and Sheng indicated that shut-in is effective because it dissipates the water blockage from the matrix-fracture interface, causing deeper matrix penetration through capillary imbibition [7]. However, this method requires a lengthy implementation time and is too passive.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tight Sandstone Reservoir Gas Permeability Improvement Using Electric Heating

Chen

Yang

et al. 2022

Energies

View full text Add to dashboard Cite

Although tight sandstone gas formations are abundant in China, their single-well productivities and exploitation efficiencies are restricted by water blocking from drilling and completion. At present, shut-in, chemical additive application, and hydraulic fracturing are the common approaches applied to handle this problem. However, these approaches are also characterized by low efficiencies or even cause secondary damage. In this study, the impact of high temperatures (of up to 800 °C) on the microstructure of a tight sandstone, including water blocking and gas permeability, are investigated through the electric heating of a simulated wellbore. The results show that the threshold temperature for fracturing of the tight sandstone is approximately 450 to 600 °C. Many secondary microcracks emerged near the wellbore beyond this temperature, improving the gas permeability, with some microcracks visible even after cooling. The gas permeability of the formation after heating to 800 °C increased by 456% and 3992% compared with the initial gas permeability and the water-blocking impacted gas permeability, respectively. This study demonstrates that electric heating is a potential method for improving the permeability of tight gas formations.

show abstract

“…3−8 However, the traditional coal seam fracturing methods have some limitations that not only can produce a water lock and water sensitivity during construction, but some methods also cause pollution and wastewater resources. 9,10 As a water-free technique for increasing coal seam permeability, liquid nitrogen fracturing has been extensively studied by many researchers. 11−16 Research on coal gas adsorption includes that by Meng et al, 17 who established the XGBoost model for evaluating gas adsorption capacity and optimizing shale gas production curves.…”

Section: Introductionmentioning

confidence: 99%

“…Coalbed methane, dominantly methane, is an important energy resource, and many countries have realized the use of coalbed methane. Gas extraction is not only the most direct way to solve the coal mine gas problem but also the best way to collect and utilize the gas. , Coal seams have low permeability, and many fracturing methods have been proposed, and some of them used, to increase the seam’s permeability and allow efficient gas extraction. − However, the traditional coal seam fracturing methods have some limitations that not only can produce a water lock and water sensitivity during construction, but some methods also cause pollution and wastewater resources. , As a water-free technique for increasing coal seam permeability, liquid nitrogen fracturing has been extensively studied by many researchers. − …”

Section: Introductionmentioning

confidence: 99%

Gas Adsorption Capacity of Coal Frozen with Liquid Nitrogen and Variations in the Proportions of the Organic Functional Groups on the Coal after Freezing

Qin

Wang

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

Studying the law of coal adsorption capacity under the action of liquid nitrogen is very important for the extraction of coalbed methane. For this study, the lignite's ability to adsorb methane was studied after it had been frozen by a number of different freezing techniques. In addition, the changes in the organic functional groups on the coal after freezing were identified by using infrared spectroscopy. The results demonstrate that as the duration of liquid nitrogen freezing and the number of freezing cycles increase, the lignite's gas adsorption capacity first decreases, then increases, and finally maintains a stable value. As the liquid nitrogen freezing time increases, the proportion of oxygen-containing functional groups increases, but the percentages of substituted benzene groups and aliphatic hydrocarbon functional groups decrease. The research shows that, compared with a single freezing, cyclic freezing has a greater effect on the lignite's gas adsorption capacity. Freezing influences the proportion of the substituted benzene functional groups on the coal the most; after freezing, the rates of change in the proportions of aliphatic hydrocarbon and oxygencontaining functional groups are only 70.76% and 80.29% as large as the change in the substituted benzene functional groups. As the proportions of the three types of functional groups increase, the lignite's gas adsorption capacity first decreases but then increases. This study will promote the development of liquid nitrogen freezing technology for coalbed methane extraction.

show abstract

Effect of desiccation on shut-in benefits in removing water blockage in tight water-wet cores

Cited by 38 publications

References 22 publications

Secondary formation damage of low-pressure layer during commingled production in multilayered tight gas reservoirs

Secondary formation damage of low-pressure layer during commingled production in multilayered tight gas reservoirs

Experimental Study on Tight Sandstone Reservoir Gas Permeability Improvement Using Electric Heating

Gas Adsorption Capacity of Coal Frozen with Liquid Nitrogen and Variations in the Proportions of the Organic Functional Groups on the Coal after Freezing

Contact Info

Product

Resources

About