Title: A semi-analytical solution for hydraulically fractured vertical wells in tight gas reservoirs with fracture networks

Authors: Shuyong Hu; Bo Li; Liehui Zhang; Bin Tang

Addresses: State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan, China ' State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan, China ' State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan, China ' Production Technology Department of Cainan Oil Field Operating Area, Xinjiang Oil Field Branch Company of PetroChina, Changji, Xinjiang, China

Abstract: Massive hydraulic fracturing technology is a key technology for efficient development of tight gas reservoirs. A complicated stimulated reservoir volume (SRV) is created around the wellbore and the major fracture. The fractures are essential to the recovery and performance of tight reservoirs wells. In this paper, a rectangular composite model of a tight gas reservoir was established to describe a fractured well with an SRV. The SRV is characterised by Warren-Root dual-porosity model. The solution is obtained by Green's and source functions. The well testing type curves are obtained by Stehfest's numerical inversion method. The transient gas flow regime and the sensitivity of variable parameters are analysed. Then, the transient production rate and cumulative production curves with different parameters of well-produced constant bottomhole pressure are plotted, and the corresponding parameters' sensitive analyses are done. The results show the seepage resistance was significantly decreased due to the existence of SRV. [Received: October 29, 2016; Accepted: August 10, 2017]

Keywords: production performance; semi-analytical method; stimulated reservoir volume; SRV; tight gas reservoir; well testing; sensitivity analysis; hydraulically fracturing; vertical wells.

DOI: 10.1504/IJOGCT.2019.101472

International Journal of Oil, Gas and Coal Technology, 2019 Vol.21 No.4, pp.435 - 462

Received: 29 Oct 2016
Accepted: 10 Aug 2017

Published online: 01 Aug 2019 *

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