西南石油大学学报(自然科学版)

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The Pass-through Capacity Analysis for Multi-layer Injection Strings in#br# Directional Wells

FENG Ding*, SHI Lei, Xia Chengyu, ZHANG Hong, TU Yiliu   

  1. School of Mechanical Engineering,Yangtze University,Jingzhou,Hubei 434023,China
  • Online:2016-06-01 Published:2016-06-01

Abstract:

With the increase of water injection layers in directional wells,the pass-through capacity analysis of injection strings
becomes necessary. The pass-through capacity has great influence on the implement of multi-layer injection process,and on
the safety of oil wells and malfunction prevention of the strings. The strings consist of at least 5 packers and distributors. After
a comparison of the axial force with the friction of the injection string in maximum curvature section in the three-dimensional
coordinate system,a new approach which can be used to analyze the pass-through capacity of injection string is given. In
consideration of the factors such as borehole trajectory,curvature,borehole diameter,stratigraphic friction,casing diameter,
and the relationship between the injection string friction and pass-through capacity,a model of dynamic load and stress profile
has been established by using the mechanics and displacement method,combined with energy and kinetic analysis. The model
can be used to analyze the process of running and pulling Multi-packer injection string in directional wells or horizontal wells.
A case study is made to verify the pass-through capacity and safety of Multi-packer injection string which proved a good field
guidance.

Key words: directional well, multi-layer injection, string, pass-through capacity, computing method

CLC Number: