Enhanced Recovery of Coalbed Methane Through Hydraulic Fracturing

1988 ◽  
Author(s):  
S.A. Holditch ◽  
J.W. Ely ◽  
M.E. Semmelbeck ◽  
R.H Carter ◽  
J. Hinkel ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Enhanced Recovery

scholarly journals Evaluation of Cyclic Gas Injection in Enhanced Recovery from Unconventional Light Oil Reservoirs: Effect of Gas Type and Fracture Spacing

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1370 ◽  
Author(s):  
Assef ◽  
Almao
Keyword(s):  
Hydraulic Fracturing ◽  
Enhanced Recovery ◽  
Gas Injection ◽  
Oil Reservoirs ◽  
Low Permeability ◽  
Fracture Spacing ◽  
Light Oil ◽  
Light Oil Reservoirs

ultra-low permeability; hydraulic fracturing; cyclical gas injection; fracking stages

scholarly journals Fracturing curve and its corresponding gas productivity of coalbed methane wells in the Zhengzhuang block, southern Qinshui Basin, North China

2020 ◽  
Vol 38 (5) ◽  
pp. 1387-1408
Author(s):  
Yang Chen ◽  
Dameng Liu ◽  
Yidong Cai ◽  
Jingjie Yao
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Continuous Production ◽  
Fracture Morphology ◽  
Geological Structure ◽  
In Situ Stress ◽  
Gas Production ◽  
Type Curves ◽  
Stable Type

Hydraulic fracturing has been widely used in low permeability coalbed methane reservoirs to enhance gas production. To better evaluate the hydraulic fracturing curve and its effect on gas productivity, geological and engineering data of 265 development coalbed methane wells and 14 appraisal coalbed methane wells in the Zhengzhuang block were investigated. Based on the regional geologic research and statistical analysis, the microseismic monitoring results, in-situ stress parameters, and gas productivity were synthetically evaluated. The results show that hydraulic fracturing curves can be divided into four types (descending type, stable type, wavy type, and ascending type) according to the fracturing pressure and fracture morphology, and the distributions of different type curves have direct relationship with geological structure. The vertical in-situ stress is greater than the closure stress in the Zhengzhuang block, but there is anomaly in the aggregation areas of the wavy and ascending fracturing curves, which is the main reason for the development of multi-directional propagated fractures. The fracture azimuth is consistent with the regional maximum principle in-situ stress direction (NE–NEE direction). Furthermore, the 265 fracturing curves indicate that the coalbed methane wells owned descending, and stable-type fracturing curves possibly have better fracturing effect considering the propagation pressure gradient (FP) and instantaneous shut-in pressure (PISI). Two fracturing-productivity patterns are summarized according to 61 continuous production wells with different fracturing type and their plane distribution, which indicates that the fracturing effect of different fracturing curve follows the pattern: descending type > stable type > wavy type > ascending type.

scholarly journals The case for enhanced coalbed methane using hydraulic fracturing in the geostructural belt

2018 ◽  
Vol 36 (6) ◽  
pp. 1629-1644 ◽  
Author(s):  
Guozhong Hu ◽  
Chao Sun ◽  
Mingfei Sun ◽  
Wei Qin ◽  
Jianshe Linghu
Keyword(s):  
Hydraulic Fracturing ◽  
Coalbed Methane ◽  
Pressure Control ◽  
Field Investigation ◽  
Gas Production ◽  
Control Flow ◽  
Location Selection ◽  
Vertical Well ◽  
Enhanced Coalbed Methane ◽  
Selection Of

Coal and gas outbursts mostly occur during mining at geostructural belts. Pre-drainage coalbed methane using hydraulic fracturing is one of the methods to prevent outbursts. However, the coal in geostructural belts is to be soft and crushed with special mechanical properties and pore structure. To explore the feasibility of hydraulic fracturing in geostructural belts, a field investigation on enhanced coalbed methane using hydraulic fracturing with vertical well was conducted at the Yangquan Coalfield, China. This case puts forward a method for the location selection of vertical well in geostructural belts. In addition, a triple-control technology for hydraulic fracturing, which is characterized by pressure control, flow control and sand ratio control of fracturing fluid, is presented. The results show that the average gas production and maximum gas drainage capacity of the test well were 5.67 and 12.88 times than those of the regular well, respectively, achieving good drainage effects.

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