Study on the Mechanism of the Asymmetry Effect of SRV Fracturing on Casing Damage

doi:10.3969/j.issn.1006-6535.2021.06.021

Abstract

Abstract: To address the problem of casing damage in the SRV fracturing of tight oil and gas reservoirs, a full-sized three-dimensional casing-cement sheath-formation coupled finite element analysis model was established according to the theories of elastoplastic mechanics and contact mechanics and the actual construction conditions of SRV fracturing, with SRV fracturing asymmetric zones characterized by different elliptic cylinders and ABAQUS solver intervened and secondly developed with Fortran subroutine, in order to simulate the dynamic evolution of physical properties and the analysis of mechanical properties of hydration-induced swelling in the SRV fracturing zones. The results showed that the loads outsides the perimeter of the wellbore were more nonuniform with the increase of the ratio of the long and short axes in the elliptical stimulated zone, and the non-uniformity transmitted to the casing through the cement sheath increased first and then tended to be stable; the non-uniformity of the external load on the casing increased with the increase of the volume expansion rate; the increase of the non-uniformity of the external load on the casing exerted more stress on the casing, easily leading to casing failure. This study provides a theoretical basis for the optimal design of SRV fracturing parameters, and plays a guiding role in the prevention against casing and cement sheath failure.

Key words: SRV fracturing, asymmetry, casing damage, finite element analysis, stress change, tight oil and gas reservoir

CLC Number:

TE931

Lin Zhiwei, Zhong Shouming, Song Lin, Wang Xuegang, Lin Tiejun, Yu Hao, Shi Tao. Study on the Mechanism of the Asymmetry Effect of SRV Fracturing on Casing Damage[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 158-164.

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