Effect of Fracturing Fluid on Coalbed-Methane Desorption, Diffusion, and Seepage in the Ningwu Basin of China

2017 ◽  
Vol 32 (02) ◽  
pp. 177-185 ◽  
Author(s):  
Xiangchen Li ◽  
Yili Kang ◽  
Defei Chen
Keyword(s):  
Coalbed Methane ◽  
Fracturing Fluid ◽  
Methane Desorption

Microwave irradiation’s effect on promoting coalbed methane desorption and analysis of desorption kinetics

Fuel ◽  
2018 ◽  
Vol 222 ◽  
pp. 56-63 ◽  
Author(s):  
Zhijun Wang ◽  
Xiaotong Ma ◽  
Jianping Wei ◽  
Ning Li
Keyword(s):  
Coalbed Methane ◽  
Desorption Kinetics ◽  
Methane Desorption

Research on Nano-Emulsion Relieving Coal Seam Water Block Damage

2021 ◽  
Author(s):  
Wei Sun ◽  
LongHao Zhao ◽  
Qian Wang ◽  
Yanchi Liu ◽  
Weiping Zhu ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Mixed Micelles ◽  
Polymer Adsorption ◽  
Coal Seams ◽  
Fracturing Fluid ◽  
Flow Experiment ◽  
Nano Emulsion ◽  
Water Block ◽  
Lock In

Abstract Hydraulic fracturing is the most effective reservoirstimulation techniques in the coalbed methane. However, the polymer in the fracturing fluid has a strong effect on the surface of the coal, causing the water lock damage as high as 70% to 90%. It is important to develop an efficient method for releasing coal seam water lock. In this paper, adsorption experiment, SEM, particle size experiment, core flow experiment, wettability and surface tension experiment are used to study the cause of coal seam water lock damage during fracturing and the effect of nano-emulsion on releasing water lock damage in coal seams. Experimental results show that after coal fracturing, the adsorption amount of polymer on the surface of coal is 14.81 mg/g. The large amount of hydrophilic polymer adsorption causes the pore radius of the coal to narrow. And the surface wettability changes from weak hydrophilic to strong hydrophilic, which increase the water lock damage. Compared with conventional slick water, fracturing fluid, the composite of nano-emulsion and fracturing fluid forms mixed micelles, which reduces the polymer adsorption capacity from 14.81 mg/g to 7.42 mg/g. After scanning by electron microscope, it is observed that the surface roughness of the rock sample is restored; The size of the nano-emulsion is about 10nm, and the very small volume can act deep in the pores of the coal seam; After using nano-emulsion, the gas/water interfacial tension is reduced by 45.1mN/m, and the wettability of coal is improved from hydrophilic to neutral, which reduces the capillary pressure in the pores of the coal and reduces the breakthrough pressure of coalbed methane by 11.1KPa; The water lock release rate is as high as 53.09%. The Nano-emulsion is an ideal choice to remove water lock damage.

The Main Problems Existing in the Exploitation of Coalbed Methane

2013 ◽  
Vol 868 ◽  
pp. 589-592
Author(s):  
Cheng Xiu Zhang ◽  
Xiao Hong Ma ◽  
Tao Wang ◽  
Qiu Hui Zhan
Keyword(s):  
Coalbed Methane ◽  
Gas Flow ◽  
Damage Mechanism ◽  
Practical Significance ◽  
Fracturing Fluid ◽  
Selection Of

Coalbed methane is one of the important unconventional energy, due to its characteristics determined there must be taken effective fracturing modification measure to get industrial gas flow, this paper analyzes the damage mechanism of fracturing fluid, the selection of additives in fracturing fluid and the methods of enhancing coalbed methane, and puts forward some corresponding suggestions to improve the recovery of CBM wells supporting a certain practical significance.

Staged Coalbed Methane Desorption and the Contribution of Each Stage to Productivity

2014 ◽  
Vol 50 (4) ◽  
pp. 344-353
Author(s):  
Feiying Ma ◽  
Yongqing Wang ◽  
Haitao Li ◽  
Lin Wang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Methane Desorption
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