Dynamic Fluid Diversion with Advanced Pressure Monitoring Technique – New Era of Multistage Refracturing in Conventional Reservoirs of Western Siberia

Alexey Borisenko, Sergey Parkhonyuk, Elena Danilevich, Arkadii Loginov, K. K. Butula, Andrey Fedorov, Dmitry Tetyuk, Aleksandr Kapkaev, Ruslan Makhmutov, Ivan Tsygulev, K. Ibragimov, Ivan Letko, Artur Mingazov, А. В. Волков, Alexey V. Ivanov, Ivan Sergeevich Samoilov
2018-10-09

dynamic diverting agenthigh-frequency pressure monitoringhorizontal wellsmultistage refracturingreservoir evaluation and candidate selection
Abstract Drilling of the horizontal wells in Russia is increasing both regarding the numbers of wells and meterage. Recently, one of the NOC reported 47% increase in a number of horizontal wells. It is clear now that shift towards horizontal wells completed with multi-stage hydraulic fracturing is increasing. On the other hand, an economic lifetime of these wells not always met. For the vertical well, a well-known and successful technique for the well revitalization is re-fracturing. Vertical wells have been responding so positively, that some operators perform refracturing up to four times on the same well. In case of the horizontal well, one of the most significant uncertainties is the fluid entry point. Starting from uneven depletion of the horizontal part of the well, not knowing the fluid entry point may lead to ineffective well re-stimulation and absence of any positive effect. In this paper, we will demonstrate integrated approach towards horizontal well re-stimulation: starting from proper reservoir evaluation and candidate selection to engineered treatment design. Several novel methods and techniques have been used: dynamic diverting agent, that has been developed to fit particularities of the conventional reservoirs, and high-frequency pressure monitoring technique, which has served as an engineering tool for fluid entry point validation.
1
A dynamic diverting agent was developed specifically for the particularities of conventional Western Siberian reservoirs to improve fluid placement during refracturing.
2
A high-frequency pressure monitoring technique is used as an engineering tool to validate fluid entry points during multistage refracturing.
3
A major uncertainty for horizontal well re-stimulation is unknown fluid entry point due to uneven depletion along the horizontal section.
4
Horizontal drilling and multistage hydraulic fracturing activity in Russia is increasing, with one NOC reporting a 47% increase in horizontal wells.
5
Horizontal wells often fail to meet expected economic lifetimes, creating need for effective re-fracturing approaches.
6
The paper demonstrates an integrated workflow from reservoir evaluation and candidate selection to engineered treatment design for horizontal well re-stimulation.

Horizontal wells in conventional Western Siberian reservoirs undergoing multistage refracturing using dynamic diverting agents and high-frequency pressure monitoring

Effectiveness of an integrated re-stimulation workflow—including dynamic fluid diversion and high-frequency pressure monitoring—for validating fluid entry points and improving multistage refracturing performance in horizontal wells

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Publication Date
2018-10-09
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Authors
Alexey Borisenko
Sergey Parkhonyuk
Elena Danilevich
Arkadii Loginov
K. K. Butula
Andrey Fedorov
Dmitry Tetyuk
Aleksandr Kapkaev
Ruslan Makhmutov
Ivan Tsygulev
K. Ibragimov
Ivan Letko
Artur Mingazov
А. В. Волков
Alexey V. Ivanov
Ivan Sergeevich Samoilov
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