Conductivity optimization research of complex network fractures in shale reservoirs of Longmaxi Formation in Sichuan Basin

Zhang Han

doi:10.11764/j.issn.1672-1926.2019.01.016

2019 , Vol. 30 >Issue 7: 955 - 962

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.01.016

Conductivity optimization research of complex network fractures in shale reservoirs of Longmaxi Formation in Sichuan Basin

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Sinopec Chongqing Fuling Shale Gas Exploration and Development Co． Ltd．，Chongqing 408014，China

Zhang Han(1993-), Male, Assistant engineer, Master, Mainly engaged in fracturing technology of shale gas wells research. E-mail：861117270@qq.com.

Received date: 2018-12-06

Revised date: 2019-01-27

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project “Fuling shale gas development demonstration project” (Grant No. 2016ZX05060).

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Abstract

The staged fracturing technology of horizontal wells is the key technology of shale gas development，and its design needs to optimize the geometry parameters and conductivity of complex network fractures.At present，the process of using productivity prediction model to optimize the parameters of network fractures is more complex and ignores the influence of self-propped fractures on the conductivity of network fractures.According to water and electricity resembling principle，complex network fractures are assumed to consist of propped fractures and self-propped fractures，and the concept of equivalent fracture is proposed.The model for conductivity optimization of complex network fractures based on different kinds of fracture morphology is presented and relationship between conductivity of propped fractures and self-propped fractures is showed in the research.Combining reservoir and fluid parameters of Well Y1，the fracturing design of horizontal wells is carried out.The optimum sand concentration of proppant of 30/50 mesh and 40/70 mesh is 3kg/m² and 5kg/m²respectively，the proppant of 70/140 mesh cannot meets conductivity demands，but the conductivity of self-propped fractures meets production demands.The simulation results show that the sand ratio of Well Y1 30/50 mesh is 2.5%-3%，40/70 mesh is 3.5%-4% through Meyer，which effectively reduces the mass of proppant and achieves good economic productivity.It is worth popularizing and applying.

Key words： Shale reservoirs; Complex network of fracture; Self-propped fractures; Water and electricity similitude principle; Proppant scale

Cite this article

Zhang Han . Conductivity optimization research of complex network fractures in shale reservoirs of Longmaxi Formation in Sichuan Basin[J]. Natural Gas Geoscience, 2019 , 30(7) : 955 -962 . DOI: 10.11764/j.issn.1672-1926.2019.01.016

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