Title: Enhance horizontal well performance by optimising multistage hydraulic fracture and water flooding

Authors: Bin Yuan; Chen Xu; Kai Wang; Wei Zhang; Rouzbeh Ghanbarnezhad Moghanloo; Xiaoguang Sun; Yuan Wang; Tingting Zhou

Addresses: Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma, Sarkeys Energy Center, 100 E. Boyd, SEC-1210, Norman, Oklahoma, USA ' Exploration and Development Research, Institute of Shanghai Offshore Oil and Gas Branch of SINOPEC, China ' Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma, Sarkeys Energy Center, 100 E. Boyd, SEC-1210, Norman, Oklahoma, USA ' Petrochina Coalbed Methane Company Limited, 9 Dongzhimen North Street, Dongcheng District, Beijing, 100007, China ' Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma, Sarkeys Energy Center, 100 E. Boyd, SEC-1210, Norman, Oklahoma, USA ' Petrochina Coalbed Methane Company Limited, 9 Dongzhimen North Street, Dongcheng District, Beijing, 100007, China ' Petrochina Coalbed Methane Company Limited, 9 Dongzhimen North Street, Dongcheng District, Beijing, 100007, China ' Petrochina Coalbed Methane Company Limited, 9 Dongzhimen North Street, Dongcheng District, Beijing, 100007, China

Abstract: In naturally fractured tight oil reservoirs, the combination of multistage fractured horizontal well and water flooding could enhance production rate and ultimate recovery. This paper introduces the combination of composite double porosity model and local refinement Technology to optimise the performance of multistage fractured horizontal well. In base of the non-uniform distributions of natural fractures, we adopt different shape factors of dual-porosity model to distinguish the stimulated area and unstimulated zone. By comparing with the performance of different SRV shapes, the optimal design of SRV is irregular shape with scattered distribution of fracture length at different locations of wellbore. The optimal size of SRV, cluster spacing, width of SRV are presented. In addition, in seven-spot injection/production well pattern, this paper presents the optimisation of multistage fractured horizontal well orientation with different SRV shapes (single-spindle and double-spindle), and well spacing. [Received: May 18, 2015; Accepted: March 1, 2016]

Keywords: naturally fractured tight oil; composite dual porosity model; fractured horizontal well; water flooding; stimulated reservoir volume; well pattern.

DOI: 10.1504/IJOGCT.2017.083857

International Journal of Oil, Gas and Coal Technology, 2017 Vol.15 No.1, pp.25 - 46

Received: 30 Sep 2015
Accepted: 01 Mar 2016
Published online: 25 Apr 2017 *

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