Int. J. of Oil, Gas and Coal Technology   »   2017 Vol.14, No.1/2

 

 

Title: Study of the effects of hydraulic fracturing at different dip angles for the development of coalbed methane: a case study in the southeast part of Qinshui Basin, China

 

Authors: Qian Zhang; Wenhui Huang; Zhazha Hu; Hongpu Zhou; Xiaoxia Lu; Kunqi Lin; Xiaodong Xia

 

Addresses:
School of Energy Resources, China University of Geosciences, Beijing 100083, China
School of Energy Resources, China University of Geosciences, Beijing 100083, China
School of Energy Resources, China University of Geosciences, Beijing 100083, China
School of Energy Resources, China University of Geosciences, Beijing 100083, China
China United Coalbed Methane Co. Ltd., Beijing100011, China; School of Energy Resources, China University of Geosciences, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China

 

Abstract: Considering the negative relationship between the production of gas and water, we should minimise water production. The dip angle of hydraulic fracturing can control not only the hydraulic connectivity between the roof and floor aquifers and the coal seam, but also the gas flow direction in the coal seam. Permeability test results show that, under the circumstances of natural fractures and cleats fewer impacts, the permeability of coal samples along the direction of the coal seam is obviously higher than that in the direction perpendicular to the coal seam (accounting for 79.2% of the samples). According to the dip angle of hydraulic fracturing, combined with the thickness of coal seam and the development status of natural fractures and cleats, hydraulic fracturing will be divided into three types: vertical dip angle of fracturing, horizontal dip angle of fracturing and inclined dip angle of fracturing. The optimal fracture dip angle: α = arcsin (H/Lmax). [Received: July 6, 2015; Accepted: June 4, 2016]

 

Keywords: coalbed methane; CBM; Qinshui Basin; negative relationship; optimal dip angle; hydraulic connectivity; hydraulic fracturing; fracking; dip angles; case study; China; coal seam thickness; permeability; natural fractures; cleats.

 

DOI: 10.1504/IJOGCT.2017.10002100

 

Int. J. of Oil, Gas and Coal Technology, 2017 Vol.14, No.1/2, pp.186 - 200

 

Date of acceptance: 04 Jun 2016
Available online: 21 Dec 2016

 

 

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