Effect of Horizontal Staged Fracturing on the Integrity of Cement Annulus

doi:10.11885/j.issn.1674-5086.2021.03.31.01

Abstract

Abstract: Casing damage and the annulus integrity in horizontal multiple-staged fracturing becomes major concerns in the industry. More focus was placed on formation slippage from fracturing fluid leakage into the faults, and stress analysis of casing and annulus, but less on the effect of multiple staged fracturing. In this paper, a model is built up for analyzing the annulus integrity in multiple-staged fracturing, with FEM and DEM. FEM model being setup is employed to obtain the elastic and plastic regions during fracturing, a DEM model acquiring stresses and strains from FEM is carried out to calculate the number of micro-cracks, and both plastic region and micro-cracks of the cement annulus are combined to evaluate annulus integrity. The research shows that besides the effect of stiffness ratio between casing to annulus, casing eccentricity, the multiple stages affect the annulus integrity significantly. The annulus integrity improves as stiffness ratio between casing to annulus increases, and the casing eccentricity and defects deteriorates it. The annulus becomes less integrated as fracturing stage number rises.

Key words: staged fracturing, microcracks, cement annulus, integrity, prevention measures

CLC Number:

TE256

ZHANG Guangqing, ZHAO Zhenfeng, WANG Xiaoxiao. Effect of Horizontal Staged Fracturing on the Integrity of Cement Annulus[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 147-154.

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