Research on Fracturing Optimization of Coalbed Methane Wells Aiming at Economic Benefit—A Case Study of Liulin Block

Jianzhong Liu, Yanchun Su, Lichun Sun, Chen Li (), Lei Wang, Yanjun Meng and Yong Li
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Jianzhong Liu: Exploration and Development Department, CNOOC China Limited, 25 Chaoyangmen North Street, Beijing 100010, China
Yanchun Su: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Beijing 100028, China
Lichun Sun: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Beijing 100028, China
Chen Li: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Beijing 100028, China
Lei Wang: School of Earth Resources, China University of Geosciences Wuhan, 388 Lumo Road, Wuhan 430074, China
Yanjun Meng: College of Mining Engineering, Taiyuan University of Technology, No. 79 Yingze Xi Street, Taiyuan 030002, China
Yong Li: College of Geosciences and Surveying Engineering, China University of Mining & Technology, No. 11, Xueyuan Road, Beijing 100083, China

Energies, 2024, vol. 17, issue 8, 1-21

Abstract: Hydraulic fracturing is an essential technology in the development of coalbed methane reservoirs. Hydraulic fracturing can create a highly conductive fracture in the reservoir and increase its permeability. At present, the focus of coalbed methane reservoir fracturing optimization is gradually shifting to the fracturing scale. In the current development process, more and more coalbed methane blocks try to increase the fracturing scale to increase the gas production of coalbed methane wells. Field tests show that gas production of coalbed methane wells will increase to a certain extent with the increase of fracturing scale. However, the increase in the scale of fracturing also increases its cost. Therefore, the most economical fracturing scale is not necessarily the optimal fracturing scale for gas production. The field test usually pays more attention to the gas production effect, but the development of a coalbed methane field should pay more attention to the economic benefit, and the optimization of fracturing should take the economic benefit as the goal. Taking economic benefits as the starting point, this paper uses fracturing simulation to calculate the fracture extension under different geological conditions and different fracturing scales. It also uses numerical simulation to calculate the gas well productivity under different fracture extension conditions. The economic evaluation model was established to calculate the economic benefits under different fracturing scales, and the optimal fracturing scale was obtained. Finally, the typical maps of fracturing optimization under different geological conditions are formed. The optimization method of fracturing scale integrating economy, fracturing, and gas reservoir is realized. The research results have been successfully applied to the optimization scheme of Liulin block development, and very good results have been achieved. Because this method is targeted at different geological conditions, it can be used to guide the fracturing optimization of other coalbed methane blocks and has very important significance for the development and optimization of coalbed methane reservoirs.

Keywords: coalbed methane; production forecast; fracturing simulation; economic evaluation; fracturing scale optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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