Segregated Completion and Subsection Steam Injection for Horizontal Wells in Xinjiang Oilfield

In order to improve steam absorption of horizontal wells,research and test on segregated completion and subsection steam injection were performed in Xinjiang Oilfield.The string for segregated completion and subsection steam injection were designed by using internal and external thermal packer and supporting tools,formation shielding effectiveness was demonstrated by combining super-heavy oil rheological experiments with numerical simulation,and blind pipe length were optimized.Mandatory segmented steam injection was implemented with effective prevention of steam channeling between two injection sections to ensure the effectiveness of segment steam injection.In 2011,Xinjiang Oilfield conducted the test of segregated completion and subsection steam injection on 9 heavy oil horizontal wells using high temperature resistant external casing packers with operation success rate of 100%.Compared with adjacent wells performance produced by commingled steam injection from traditional dual tubing,oil/steam ratio of horizontal wells using segregated completion is 0.44 higher after the first round of steam stimulation indicating good effect of subsection steam injection.This proves that segregated completion and subsection steam injection in horizontal wells of heavy oil recovery is feasible and practical and provides new technical support for the efficient exploitation of super-heavy oil in Xinjiang.