Shear test, stress analysis predict collapsing pressure in China's Liu Shagang shale Lixi Liang, Yi Ding, Xiangjun Liu
By: Liang, Lixi
Contributor(s): Ding, Yi | Liu, Xiangjun
Subject(s): Cortes de perforación -- Ensayos | Perforación de pozos de petroleros -- China
In:
Oil & gas journal Vol.114, No.2, 2016: páginas 52-56Abstract: A new study uses shear tests and seepage-stress analysis in north China's Liushagang formation to create a model that predicts collapsing pressure and avoids costly drilling delays in hard, brittle shales. Like other formations of its kind, Liushagang has a strong hydration capacity as well as many bedding planes and microcracks. Drilling in these rock conditions can create wellbore instability and the potential for collapse. In this study, shear tests were used to assess the strength of Liushagang's bedding planes and rock matrices before and after soaking in drilling fluid.
A new study uses shear tests and seepage-stress analysis in north China's Liushagang formation to create a model that predicts collapsing pressure and avoids costly drilling delays in hard, brittle shales. Like other formations of its kind, Liushagang has a strong hydration capacity as well as many bedding planes and microcracks. Drilling in these rock conditions can create wellbore instability and the potential for collapse. In this study, shear tests were used to assess the strength of Liushagang's bedding planes and rock matrices before and after soaking in drilling fluid.
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