«Geology, geophysics and development of oil and gas fields»

Numerical simulation of changes of the borehole zone stress-strain state under the influence of hydrogen

UDC: 622.245.14
DOI: -

Authors:

¹ Oil and Gas Research Institute Russian Academy of Sciences, Moscow, Russia

Keywords: numerical modeling, near-wellbore zone, stress-strain state, hydrogen injection

Annotation:

Based on the numerical finite element model, the author of the article calculated the stress-strain state in the borehole zone before and after the impact of hydrogen on the terrigenous reservoir rock. The calculation was carried out for the conditions of the Bobrikov horizon of the Karashur UGS. The numerical model of the vertical well took into account the transformation of the rock elastic properties the under the influence of hydrogen, based on previously conducted experimental studies with core samples. The results of numerical modeling showed an insignificant change in the stress state near the well after hydrogen injection and its extraction from the formation: for radial stresses the maximum change was –1,66 % at the column–cement and cement–rock contacts, for angular stresses the maximum change was –2,99 % on the inner wall of the production casing. It was concluded, that based on the results of numerical modeling an insignificant effect of hydrogen injection and extraction on the stress-strain state of the near-wellbore zone was revealed.

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