Title: Study on the productivity of the multi-stage fractured horizontal wells in tight oil reservoirs

Authors: Linjing Xu; Shicheng Zhang; Fei Wang; Xinfang Ma

Addresses: Lab of Petroleum Engineering of MOE, China University of Petroleum, Beijing, 102249, China ' Lab of Petroleum Engineering of MOE, China University of Petroleum, Beijing, 102249, China ' Lab of Petroleum Engineering of MOE, China University of Petroleum, Beijing, 102249, China ' Lab of Petroleum Engineering of MOE, China University of Petroleum, Beijing, 102249, China

Abstract: In this paper, a comprehensive dual-porosity and dual-permeability oil/water flow model that uses experimentally determined reservoir properties to simulate well performance of a multi-stage fractured horizontal well in tight oil reservoirs was established. The numerical simulation results was validated by the commercial simulator Eclipse and field production data. Besides, the effect of threshold pressure gradient, stress-sensitive matrix permeability, stress-sensitive fracture conductivity, and capillary pressure was conducted, revealing that those factors affect the well productivity in different degrees. The results indicate that the threshold pressure gradient can significantly reduce the well productivity. The impact of stress-sensitive coefficient should be significant to oil production in high stress-sensitive tight oil reservoirs. Also, the effects of fracture conductivity and capillary pressure on oil production was studied. This study provides a basis for long-term tight oil production analysis of hydraulically fractured tight oil wells. [Received: October 8, 2016; Accepted: January 28, 2017]

Keywords: tight oil reservoir; multi-stage hydraulic fracturing; well productivity; multiphase flow simulation; horizontal well.

DOI: 10.1504/IJOGCT.2019.098455

International Journal of Oil, Gas and Coal Technology, 2019 Vol.20 No.3, pp.243 - 265

Received: 08 Oct 2016
Accepted: 28 Jan 2017
Published online: 25 Mar 2019 *

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