Stress Analysis of the Integrity of Casing-Cement Ring-Structural Consolidation Body by Volume Fracturing

Yong OUYANG, Yunwen GAO, Xianwen WANG, Zhifeng DUAN


For unconventional oil and gas reservoirs, the main body at home and abroad adopts segmented fracturing technology for cemented well completion bridge plugs, and the application ratio accounts for more than 85%. In order to improve the development effect of the tight oil and gas reservoirs in the Ordos Basin and increase the output of single wells, the horizontal wells in the Sulige tight gas reservoir adopt casing cementing well completion + bridge plug fracturing. The integrity between the casing-cement ring and the formation consolidation body is the precondition for ensuring the effectiveness of the segmented fracturing closure and the transformation effect. In this paper, the wellbore is subjected to alternating pressure when the volume of horizontal wells is compressed. By analyzing the force of the casing-cement-soil consolidated body and the temperature and casing internal pressure, the calculated relationship between the force of the consolidated body and the displacement of the first and second cemented surfaces was obtained. It provides an important reference for guiding the on-site construction design and follow-up research.


Consolidated body; Cementitious surfaces; Temperature; Casing pressure

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