«Onshore and offshore oil and gas well construction»

Experience of geomechanical modeling application when drilling wells in complex tectonic conditions at the field in the Timan-Pechora oil and gas province

UDC: 622.24.001
DOI: -

Authors:

¹ LUKOIL-Engineering, Perm, Russia

Keywords: 1D geomechanical modeling, well logging, faults, cave-in debris, drilling fluid loss, stress calculation, pore pressure, wellbore stability, optimal well design, safe mud density window

Annotation:

The authors of the article present experience of applying geomechanical modeling when drilling wells in complex tectonic conditions at one of the fields in the Timan-Pechora oil and gas province. The analysis of wellbore drilling events at this field revealed the fact that the main problems were dragging and sticking of the drilling tool, the presence of cave-in debris and flushing liquid loss in unstable Triassic sediment intervals. In one of the wells, simultaneous wall collapse and flushing liquid loss created incompatible conditions for running down the casing string. Seismic data interpretation identified a major tectonic fault intersecting the wellbore. To minimize the risk of similar complications occurrence, one-dimensional (1D) geomechanical modeling was performed, including vertical and horizontal stress calculations, pore pressure profiling and determination of the dynamic as well as static elastic-strength properties of rocks at the field under study. Based on the geomechanical and engineering calculations, pore pressure gradients, pressure collapse, flushing fluid loss, and hydraulic fracturing pressures were determined, a safe mud density window was established, and the optimal well design was determined.

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