Evaluation of reservoir saturation and unrecovered reserves localization by pulse-code interference testing

Volkov Yu.V. Kazan Federal University, Institute for problems of ecology and mineral wealth use of Tatarstan academy of sciences Kazan
Mingaraev R.A. rammingaraev@yandex.ru Institute for problems of ecology and mineral wealth use of Tatarstan academy of sciences Kazan
Fatkulin M.R. Institute for problems of ecology and mineral wealth use of Tatarstan academy of sciences Kazan
Khaziev R.R. nstitute for problems of ecology and mineral wealth use of Tatarstan academy of sciences Kazan
Andreeva E.E. nstitute for problems of ecology and mineral wealth use of Tatarstan academy of sciences Kazan
Zinurov L.A. “Sofoil” LLC Kazan
DOI: 10.24412/2076-6785-2021-5-35-39

Abstract
In this paper, the method of pulse-code testing (PCT) on one of the squares of the fields of the Volga-Ural province to assess localized reserves of hydrocarbons (HC) and the feasibility of workovers and sidetracking to increase ultimate recovery up to value at field development plan. During the PCT, the following tasks were solved: the residual hydrocarbon reserves in the study area were estimated; the forecast indicators of liquid and oil after the sidetracking were calculated; the influence of the generator well Y1 on the surrounding wells was estimated.

Materials and methods
During PCT surveillance, downhole pressures were recorded at wells using zPas-20M quartz pressure gauges (with a resolution of 20 Pa) which is based on a temperature-stabilized quartz crystal. Furthermore, water injection rate of the injection well was measured using a portable flow meter. PCT is based on the Pulse-Code Decomposition (PCD) algorithms –
a procedure for decomposing complex pressure responses at each well into different components, where each component correlates with the flow rate changes history of only one particular generating well.

Keywords
well testing, interference test, oil reservoir, transmissibility, diffusivity, reservoir evaluation, reserves localization
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