Data Mining on the Influence of Capillary Force on the Productivity of CBM Wells. Issue 1 (April 2021)

• Record Type: Journal Article
• Authors: Bin, Liu; Hongli, Wang; Suian, Zhang; Xiao, Zhang; Qiguang, Liu
• Is Part Of: Journal of physics. Volume 1894:Issue 1(2021)
• Publication Date: 2021-04
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1894/1/012061
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: To explore the influence of the capillary force in the coal matrix on the productivity, based on the dynamic capillary force of the gas and water phase, the high-pressure Hg injection method, the porous plate method, and the centrifuge method were used to analyze the No.3 coal seam of the Zhengzhuang block in the southern Qinshui Basin. Through the experimental analysis of 97 samples, 3 different capillary force models are proposed. Through data mining, it is found that when the displacement pressure is 1.247 MPa, the average residual water saturation of the sample is 89.21%; when the displacement pressure is 4.0 MPa, the residual saturation of 82.5% of the samples exceeds 80%. This means that the desorption process of adsorbed coalbed methane is subject to greater capillary force. If the capillary force cannot be overcome, the gas production of coalbed methane wells will be at a low level.