A case study on the effective stimulation techniques practiced in the superposed gas reservoirs of coal-bearing series with multiple thin coal seams in Guizhou, China

Jia, Jia; Cao, Liwen; Sang, Shuxun; Yi, Tongsheng; Zhou, Xiaozhi

doi:10.1016/j.petrol.2016.07.005

Cited by 17 publications

(2 citation statements)

References 46 publications

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“…Many sets of coal and CBM formation have been developed in Guizhou (Gao et al., 2009; Xu et al., 2016; Yang et al., 2018). For the characteristics of multi-thin coal seams in Longtan formation, some technologies about small layer perforation, staged fracturing technique, ball sealer diversion and graded proppant injection have been applied for CBM development recently (Jia et al., 2016). However, the research on shale gas was more concentrated in the marine black shale of the Lower Silurian Longmaxi formation and Lower Cambrian Niutitang formation, and the coal-bearing shale is less studied (Luo et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Sang

Yang

et al. 2018

Energy Exploration & Exploitation

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Indentifying reservoir characteristics of coals and their associated shales is very important in understanding the co-exploration and co-production potential of unconventional gases in Guizhou, China. Accordingly, comprehensive experimental results of 12 core samples from well LC-1# in the northern Guizhou were used and analyzed in this paper to better understand their vertical reservoir study. Coal and coal measured shale, in Longtan Formation, are rich in organic matter, with postmature stage of approximately 3.5% and shales of type III kerogen with dry gas generation. All-scale pore size analysis indicates that the pore size distribution of coal and shale pores is mainly less than 20 nm and 100 nm, respectively. Pore volume and area of coal samples influenced total gas content as well as desorbed gas and lost gas content. Obvious relationships were observed between residual gas and BET specific surface area and BJH total pore volume (determined by nitrogen adsorption). For shale, it is especially clear that the desorbed gas content is negatively correlated with BET specific surface area, BJH total pore volume and clay minerals. However, the relationships between desorbed gas and TOC (total

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Section: Introductionmentioning

confidence: 99%

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Sang

Yang

et al. 2018

Energy Exploration & Exploitation

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“…Nasedkina and Trufanov (2006) established a mathematical model of the process of hydrodynamic fracturing in a multi-layer coal seam based on the equation of continuity and Darcy's law. Jia et al (2016) suggested some effective stimulation techniques adapting to the superposed reservoirs of coal measures and further studied the mechanism on adaptable hydraulic fracturing of the superposed reservoirs associated with multiple thin coal seams. Ni et al (2010) researched the key technology of combined seam fracturing and confirmed the practicality of the craft, reducing development costs and overcoming the limitations of geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fracture Propagation Characteristics of Hydraulic Fracturing in Multiple Coal Seams, Eastern Yunnan, China

et al. 2022

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As a reservoir reconstruction technology, hydraulic fracturing is a key method to improve the production of coalbed methane (CBM) wells. The CBM reservoir in eastern Yunnan, an important CBM exploration and development zone in China, is characterized by multiple thin coal seams. Compared to the fracturing of the single-layer coal seam, the combined seam fracturing technology is more difficult and complex. To study the fracture propagation characteristics and influencing factors of hydraulic fracturing in multiple coal seams, taking No. 9 and No. 13 coal seams as the research objects, the fracturing process was numerically simulated by using the finite element method and ANSYS software in this work. Based on the mathematical model of low permeable coal-rock mass, a two-dimensional hydraulic fracture model was established. In addition, the fracture geometries of combined seam fracturing were studied quantitatively. The results indicate that although No. 9 coal and No. 13 coal seams have similar rock mechanical properties, the propagation process and final geometry of a fracture are different. The reliability of the simulation results is verified by the comparison of experimental parameters and field investigation. The results prove the feasibility of combined seam fracturing in eastern Yunnan. The high Young’s modulus and thickness of the coal seam make the fracture geometry longer, but the fracture height is smaller. The low Young’s modulus, high Poisson’s ratio, and thickness of the No. 13 coal seam result in an increase in the length and height of the No. 9 coal seam. The increase in Young’s modulus of interlayer inhibits the propagation of fractures, while the high thickness and low Poisson’s ratio of interlayers facilitate the extension of the length and inhibit the extension of the height. This work provides a case reference for combined seam fracturing of coal reservoirs and has practical significance for the development of CBM characterized by multiple coal seams in eastern Yunnan.

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Coupled accumulation characteristics of Carboniferous-Permian coal measure gases in the Northern Ordos Basin, China

2018

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A case study on the effective stimulation techniques practiced in the superposed gas reservoirs of coal-bearing series with multiple thin coal seams in Guizhou, China

Cited by 17 publications

References 46 publications

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China

Numerical Simulation of Fracture Propagation Characteristics of Hydraulic Fracturing in Multiple Coal Seams, Eastern Yunnan, China

Coupled accumulation characteristics of Carboniferous-Permian coal measure gases in the Northern Ordos Basin, China

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