Research on Well Patterns and Fracture Models for Fractured#br#
Horizontal Well in Ultra-low Permeability Reservoir

doi:10.11885/j.issn.1674-5086.2014.05.05.02

Abstract

Abstract:

In order to extend the water-free production period，to improve well production and oil recovery，and to reduce water
cut rising of fractured horizontal well，the formula of water flooding front is deduced in this article，and the horizontal well
patterns，fracture models，horizontal section length，fracture penetration ratio and the row spacing are optimized by reservoir
numerical simulation and reservoir engineering. The results show that the five-spot well pattern is of higher oil recovery and
lower water cut rising，compared with the seven-spot well pattern. Among the equal-length fracture model，dumbbell-shaped
model and spindle-shaped model，the spindle-shaped model gives the highest cumulative oil production，oil recovery and the
longest water-free production period，and the spindle-shaped model gives the lowest water cut with the same oil recovery. In
the ultra-low permeability reservoir，the shorter the horizontal section，the higher the oil recovery. When the horizontal length
is more than 500 m，the payback period increases and the net present value decreases with the increase of horizontal length.
When the optimal fracture penetration ratio is 0.7，the optimal row space is 300 m. The results have certain significance for
researches on horizontal well patterns and fracture models of similar reservoirs.

Key words: ultra-low permeability reservoir, fractured horizontal well, water flooding front, well patterns and fracture models
optimization, horizontal section length optimization, penetration ratio

CLC Number:

TE348

TAO Zhen*, TIAN Changbing, XIONG Chunming, ZHAO Ruidong. Research on Well Patterns and Fracture Models for Fractured#br# Horizontal Well in Ultra-low Permeability Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.05.05.02.

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Research on Well Patterns and Fracture Models for Fractured#br# Horizontal Well in Ultra-low Permeability Reservoir

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