The Research on Fracture Initiation Mechanism for Sand Jetting#br#
Perforation Technology

doi:10.11885/j.issn.1674-5086.2013.03.11.04

Abstract

Abstract:

Compared with the shaped charge perforation，sand jetting perforations are characterized by bigger diameter，longer
length and smaller perforation number. Because the fracture morphology will be affected by perforated tunnel，the stress distribution
around tunnels and fracture initiation mechanism were studied for sand jetting perforation. Based on the 3D finite element
computation method and the research results of indoor experiments，hole distribution，perforation azimuths and azimuths of
horizontal well are evaluated to reveal three fracture shapes around wellbore. The results show that the fracture easily initiate
from the root of perforation tunnels；when the degree of included angle θ between horizontal section and minimium horizontal
stress is less than 30°，double layer perforation method can create one fracture，and multiple fractures are generated by helical
perforation and symmetric perforation. Because longitudinal fracture is more easily created than transverse ones，hydraulic
fracture process will lead to a contortion fissure. In the condition of θ more than 80°，there is only a longitudinal fracture in
horizontal wellbore，which is not affected by perforation parameters. The result was also a theoretical basis for reasonable use
of jetting perforation and hydraulic fracturing in horizontal well.

Key words: abrasive perforation, fracture initiation mechanism, fracture morphology, hydraulic fracturing

CLC Number:

TE357.1

Qu Hai1*, Liu Ying2, Xu Ying1. The Research on Fracture Initiation Mechanism for Sand Jetting#br# Perforation Technology[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.03.11.04.

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The Research on Fracture Initiation Mechanism for Sand Jetting#br# Perforation Technology

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