期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 26, 期 -, 页码 981-991出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2015.07.031
关键词
Fractured horizontal well; Reynolds number; Apparent fracture permeability; Apparent equivalent wellbore radius; Inertial non-Darcy effects
资金
- Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering
- National Major Science and Technology Special Projects of A New Generation of Numerical Simulation Software System [2011ZX05009-006]
A multiply fractured horizontal well is one of the most effective methods for improving the productivity of low permeability reservoirs. There could be large errors when calculating the productivity of fractured horizontal gas wells if inertial non-Darcy flow in the fractures is not considered. However, there are few reports about the deliverability equation of fractured horizontal wells influenced by non-Darcy effects due to the difficulty in coupling non-Darcy flow in the fractures and radial Darcy flow in the reservoir. A new concept named apparent equivalent wellbore radius, which considers inertial non-Darcy flow in a fracture, is proposed. An iterative process is presented to calculate the productivity of fractured vertical gas wells using the new concept. Then, the iterative process is extended to calculate the productivity of multiply fractured horizontal gas wells using the advantage of the apparent equivalent wellbore radius, which conforms to the superposition principle. The results show that inertial non-Darcy effects could decrease well production greatly even in low permeability reservoirs (<1 mD) and reduce potential interference between hydraulic fractures. (C) 2015 Elsevier B.V. All rights reserved.
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