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

Innovative approaches to control development of reservoirs with anomalously low permeability

UDC: 622.276.031.011.433:550.832.9
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: low-permeability reservoir, production logging, pressure transient analysis, early radial flow regime, inflow profile, SRV zone, hydraulic fracturing, hydraulic fracturing fluid

Annotation:

In this paper the authors present the results of a comprehensive analysis of the informativeness of development control methods in reservoirs with anomalously low permeability when drilling long horizontal wells with cluster multistage hydraulic fracturing. There are both factors that significantly reduce the capabilities of the methods and that significantly increase their informativeness. The authors performed analytical work on the basis of reservoirs of Achimov and Bazhenov formations, the peculiarity of which is significant oil degassing during production. First, the authors considered the possibilities of well thermometry in diagnosing the inflow profile by cluster fractures of hydraulic fracturing. Thus, contrasting thermoanomalies associated with injection of cooled fracturing fluid into the formation or with gas release from oil significantly increase the informativeness of thermometry when evaluating the inflow profile in low-yield horizontal wells with multistage fracturing. In addition, depending on the technology of research, it is possible to estimate the flow profile to each cluster fracture, despite their close location to each other.

Secondly, the authors considered the possibilities of processing of early flow regimes by pressure transient analysis (PTA). The authors formulated an approach to the processing of PTA at anomalously low permeability of the formation, removing a number of uncertainties arising from the classical processing, and proposed new possibilities of practical application of the results obtained, which will help to verify hydraulic fracturing technologies in terms of efficiency.

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