Laboratory study on hydraulic fracture geometry of Longmaxi Formation shale in Yibin area of Sichuan Province

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  • 1.Langfang Branch,Research Institute of Petroleum Exploration & Development,PetroChina,Langfang 065007,China;
    2.Key Laboratory of Reservoir Stimulation,PetroChina,Langfang 065007,China

Received date: 2016-04-08

  Revised date: 2016-06-15

  Online published: 2019-09-06

Abstract

Hydraulic fracturing is an important technology in shale gas reservoir development.Due to complex geological conditions,it is hard to know fracture propagation mechanism clearly and how to maximize the stimulated reservoir volume (SRV) is the key issue for hydraulic fracturing.A series of tests have been done with shale blocks from Longmaxi Formation outcrop to simulate hydraulic fracturing in field.The effect of natural fractures,in situ stress conditions,and pump injection parameters on hydraulic fracture geometry have been studied respectively.Meanwhile,fracture propagation in real time was analyzed by acoustic emission monitoring technology.The experimental results showed that the existence and distribution pattern of natural fracture system determine the hydraulic fracture geometry.The higher injection net pressure would result in more complex hydraulic fracture system.But the pumping rate and fluid viscosity were not always directly proportional to the injection net pressure.Hydraulic fracture system would be simpler when the pumping rate and fluid viscosity exceed a limited level.According to the location of acoustic events in space,it could reflect the hydraulic fractures distribution range.The changing coherence of acoustic frequency,amplitude and pressure curve also confirmed fracture discontinuous propagation in shale due to high rock brittleness.This work has explored experimental methods for the research of shale fracturing mechanism,and provided an experimental basis for volume fracturing process design in field.

Cite this article

Fu Hai-feng, Liu Yun-zhi, Liang Tian-cheng, Weng Ding-wei, Lu Yong-jun, Xiu Nai-ling . Laboratory study on hydraulic fracture geometry of Longmaxi Formation shale in Yibin area of Sichuan Province[J]. Natural Gas Geoscience, 2016 , 27(12) : 2231 -2236 . DOI: 10.11764/j.issn.1672-1926.2016.12.2231

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