2017_EJRNL_PP_JIANQIANG_XUE_1.pdf
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Multi-fractured horizontal wells are commonly employed to improve the productivity of low and
ultra-low permeability gas reservoirs. However, conventional productivity models for open-hole
multi-fractured horizontal wells do not consider the interferences between hydraulic fractures
and the open-hole segments, resulting in significant errors in calculation results. In this article, a
novel productivity prediction model for gas reservoirs with open-hole multi-fractured horizontal
wells was proposed based on complex potential theories, potential superimposition, and numerical analysis. Herein, an open-hole segment between two adjacent fractures was regarded as
an equivalent fracture, which was discretized as in cases of artificial fractures. The proposed
model was then applied to investigate the effects of various parameters, such as the angle between the fracture and horizontal shaft, fracture quantity, fracture length, diversion capacity of
fractures, horizontal well length, and inter-fracture distance, on the productivity of low permeability gas reservoirs with multi-fractured horizontal wells. Simulation results revealed that the
quantity, length, and distribution of fractures had significant effects on the productivity of low
permeability gas reservoirs while the effects of the diversion capacity of fractures and the angle
between the fracture and horizontal shaft were negligible. Additionally, a U-shaped distribution of
fracture lengths was preferential as the quantity of fractures at shaft ends was twice that in the
middle area.