Hydraulic Fracturing for In Situ Stress Measurement
S. V. SERDYUKOV, M. V. KURLENYA, A. V. PATUTIN
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: массив горных пород, напряженное состояние, скважинные исследования, метод гидроразрыва, трещина, измерение напряжений, давление запирания, устройство гидроразрыва, ошибка измерений, rock mass, stress state, borehole investigations, hydraulic fracturing, fracture, stress measurement, shut-in pressure, hydraulic fracturing facility, measurement error
Abstract
It is experimentally found that shut-in pressure conforms with the fracture initiation pressure if fracture surfaces are uniformly loaded by fluid. The article shows that equaling minimal stress and shut-in pressure in local fractures results in overestimates. The error depends on the length of a hydrofracturing facility and is high under low compression in rocks (5-10 MPa). The authors put forward decisions aimed at improvement of accuracy and enhancement of information content of hydraulic fracturing in the in situ stress measurement.
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