Effect of Ammonium Persulfate on Adsorption and Desorption of Coal

Tuo Shan

《World Scientific Research Journal》 8卷4期 (2022/04) Pp. 49-55

https://doi.org/10.6911/WSRJ.202204_8(4).0008

摘要

The effects of ammonium persulfate on parameters such as desorption constant, critical desorption pressure, gas saturation, initial gas release velocity and firmness coefficient of coal reservoir are discussed, which provides basic data for the application of ammonium persulfate as gel breaker in coal reservoir fracturing. Ten groups of coal samples before and after ammonium persulfate treatment were tested for isothermal adsorption, initial gas emission rate and firmness coefficient. The results show that: Ammonium persulfate can effectively reduce the limit adsorption capacity of medium and high rank coal reservoirs, improve their critical desorption pressure and gas saturation, and is conducive to the production of coalbed methane; To a certain extent, it can accelerate the desorption of coalbed methane under atmospheric pressure and improve the output efficiency of coalbed methane; After ammonium sulfate treatment, the f value of coal sample decreases comprehensively, and the larger the original F value is, the greater the decline is.

關鍵字

Ammonium persulfate ； Coal ； Isothermal adsorption ； Initial speed of methane diffusion ； Consistent coefficient

參考文獻

Jack C. Pashin.Variable gas saturation in coalbed methane reservoirs of the Black Warrior Basin: Implications for exploration and production[J]. International Journal of Coal Geology. 2010(No. 3-4).

Zhang Qun,Feng Sanli,Yang Xilu. Discussion on basic reservoir characteristics and development strategies of coalbed methane in my country[J]. Coal Journal. 2001(03):230-235.

Willberg D M, et al. Determination of the effect of formation water on fracture fluid clean up through field testing in the east texas cotton valley. Paper SPE 38620, 1977, October: 5-8.

Houchin L R, Hudson L L, Caothien S, et al. Reducing formation damage through two- stage polyMer filtration: Paper SPE15408.

Zhang Gaoqun, Xiao Bing, Hu Yaya,et al. Application of new active water fracturing fluid in coalbed methane wells[J].Drilling and Completion Fluids.2013,30(02):66-68+95.