«Oilfield engineering»

Invariant of dependence between filtration and capacitive parameters at filtration transient mode to the wells with a multi-stage hydraulic fracturing as an instrument of hydrodynamic data interpretation

UDC: 622.276.038:532.5+622.276.66
DOI: 10.33285/0207-2351-2022-8(644)-13-20

Authors:

¹ Gazpromneft, Scientific Technical Center, Saint Petersburg, Russia

Keywords: invariant, filtration and capacitance properties, complex well completion

Annotation:

Reserves with low filtration properties are increasingly involved in the development, which leads to the use of complex completion wells. Firstly, such technologies as multi-stage hydraulic fracturing on horizontal wells, as well as drilling of multilateral well are used. Complex completion of wells, coupled with complex conditions for the development of hard-to-recover reserves, predetermine the high cost of such wells and, as a result, the great need to understand the effectiveness of completion using a particular technology.

The existing methods of geophysical researches, due to their possible radius of research, are not sufficient to answer the question of the effectiveness of completing wells of complex completion. Well testing covers a significant radius of research around wells, but now they have a significant disadvantage in terms of data interpretation methodology. It lies in the fact that the interpretation of the data is based on a late radial regime, which, on the one hand, is not always possible to achieve in an acceptable time of research, on the other hand, it does not make it possible to exclude interference between different parts of the well drain of complex completion for accurate determination of the geometry of the effective fluid flow into the well.

It is shown in the presented work that at the transient regime for a well with multi-stage hydraulic fracturing of different geometry there is a unique invariant between filtration and capacitive parameters that makes it possible to interpret both the filtration model and the properties of the reservoir at the early pre-radial transient regimes. This allows solving simultaneously two current problems in pressure transient analysis of wells of complex completion: 1) the impossibility of achieving a late pseudo-radial filtration regime for an unambiguous interpretation of the filtration properties of the reservoir within an acceptable period of well testing period; 2) exclude the influence of interference of different sections of a well with a complex completion to accurately determine the geometry of the effective flow into the well.

Bibliography:

1. Shchelkachev V.N., Lapuk B.B. Podzemnaya gidravlika. – M.–Izhevsk: NITs "Regulyarnaya i khaoticheskaya dinamika", 2001. – 106 s.

2. Kovalenko I.V. Potentsial lineynogo stoka v plaste // Nauka i TEK. – 2012. – № 2. – S. 32–33.

3. Kovalenko I.V. Razrabotka metodov interpretatsii gidrodinamicheskikh issledovaniy treshchin gidrorazryva plasta gorizontal’nykh skvazhin pri otsutstvii psevdoradial’nogo rezhima fil’tratsii: dis. … kand. tekhn. nauk: 25.00.17. – Tyumen’, 2013.