“High pressure” hydraulic fracturing or practical experience of geomechanical modeling.

Tuesday, 10 February 2015 Read 4711 times
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With great probability today we can say that hydraulic fracturing is not the only one of the methods for oil extraction intensification but is an effective instrument for oil field development process regulation in whole. The analysis of accumulated experience at hydraulic fracturing operations allows us to speak about its effectiveness almost at all oil field development stages.

In many ways the effectiveness of hydraulic fracturing as any other kind of production stimulation depends on input data used for treatments planning. The fracture initiation and propagation essentially depends on rock mechanics. The most important parameters which we have to take into account for correct design are minimal horizontal stresses, more properly stress profiles or 2D geomechanical models.

The approach for 2D geomechanics models creation is represented in this work. According to suggested method the logs (GR, NGR, SP etc.), PNL log, well inclination, formation rock mechanical properties estimated during special logging and laboratory tests and data frac analysis are necessary for geomechanics models building up. The experience of Dipole Shear Sonic log implementation and core analysis for rock mechanical properties determination and its further usage for 2D geomechanical models construction are shown.

The main distinguishing characteristic of Samara region hydraulic fracturing operations is the high fracturing gradient which connected to high stresses in the oil traps due to tectonic processes. The first geomechanical models for Samara region were constructed on the base of suggested method which allowed us to determine the anomalous high fracturing pressure zones. The practice of anomalous high fracturing pressure layers stimulation by special frac fleet (treatment pressure up to 1000 atm - “High pressure” frac) is presented.

As a result the successful geomechanical modeling and high pressure fracs gave new opportunities to development of economically unprofitable fields in Samara area.

About author

Alexander Letichevskiy – head of production stimulation and hydraulic fracturing division in OJCS Samaraneftegaz (OJSC “Rosneft” Oil Company). Graduated from Heriot-Watt University’s Petroleum Engineer Master's degree program. Since 2010 he is employed by “Rosneft” Oil Company and during his career was studying, developing and implementing new technologies in the hydraulic fracturing area to increase the efficiency of oil production in Samara region. In 2013 was the Chairman of The Young Professionals Board of the OJSC Samaraneftegaz. The active participant and winner of different technical conferences. The author of more than 10 articles in several technical publications.

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