(INTEGRATION OF GEOPHYSICAL, PETROPHYSICAL AND GEOMECHANICAL METHODS FOR A DESIGN OF HYDRAULIC FRACTURING IN LOW-PERMEABLE RESERVOIRS ON THE EXAMPLE OF THE TURONIAN AND JURASSIC DEPOSITS OF WESTERN SIBERIA)
One of the main trends in the development of the oil and gas industry is the involvement in the development of tight reserves. A special feature of development of low-permeability reservoirs in Western Siberia is the use of hydraulic fracturing as a method of maximizing production and achieving profitability of wells. However, simple copying of intensification technologies from one object to another is not effective and requires fine-tuning in accordance with the geological conditions of each reservoir. This is due to the fact that low-permeability formations require the creation of an effective drainage zone, while interaction with the fracturing fluid may significantly impair the filtration-volume properties of rocks due to changes in wettability, clay swelling and formation of water screens. In addition, the release of bound formation water during the hydraulic fracturing changes the water cut, which also negatively affects the well efficiency.
This article presents a methodology for a hydraulic fracturing design for low-temperature gas and high-temperature oil deposits, based on the integration of various research methods, data sources and approaches to designing hydraulic fracturing processes. The hydraulic fracturing model is based on the petrophysical and geological models and added with the geomechanical model based on core tests and well logging. A complex fracturing model can be imported into a hydrodynamic simulator to estimate well production at different parameters and to compare model and real well performance after stimulation.
The paper also shows the process of adjusting the hydraulic fracturing design at each stage from design to a pilot treatment and transferring model parameters to the design of a multi-zone hydraulic fracturing in a horizontal well. At the stage of implementation of multistage hydraulic fracturing, the application of treatment control methods using microseismic and tracer studies and model correction based on observation data, design adaptation and work program of subsequent treatments are shown. The results of research confirming the convergence of modeling data and hydraulic fracturing treatments are presented. The article shows a general approach to the study and modeling of hydraulic fracturing for formations with completely different geological and geophysical characteristics.
V.N. Astafyev1, e-mail: Vladimir.email@example.com;
V.V. Vorobyev2, e-mail: VorobevVV@sngp.com;
M.I. Samoilov3, e-mail: MISamoilov@ceptr.rosneft.ru
1 BurServis LLC (Moscow, Russia).
2 Severneftegazprom OJSC (Novy Urengoy, Russia).
3 RN – PR&TDC LLC (Tyumen, Russia).
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