Field testing of the flowback technology for multistage-fractured horizontal wells: Test results and primary interpretation of the results

Albert Vainshtein, Georgii Fisher, Sergei Boronin, Andrei Osiptsov, Ildar Faysullin, Gregory Paderin, Andrei Shurunov, Alexander Prutsakov, Ruslan Uchuev, Igor Garagash, Kristina Tolmacheva, Egor Shel, Dmitry Prunov, Nikolay Chebykin

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    The paper presents the results of applying the methodology of well flowback and startup after hydraulic fracturing (HF), previously proposed in (Osiptsov et al., 2019), where the preferred conditions for well flowback after hydraulic fracturing are formulated in the form of a field experiment program. The program was implemented in 2019-2020 at four out of ten wells of the Priobskoye field in Western Siberia. The comparison of the two well clean-up designs, "smooth" and "aggressive", aimed to confirm the hypothesis that the choice of a "smooth" mode can reduce undesirable geomechanical effects to preserve the fracture conductivity and increase the recovery. Adapting our own hydrodynamic and geomechanical models to actual data made it possible to control the well clean-up process in the wells of a field experiment. Well site supervision allowed authors to fully implement the research plan, and also provided the opportunity to vary the parameters of the experiment (adjusting flowrate over time, adjusting the sampling and measurement schedules) using history matched models with actual parameters of the wells. Based on the results, the obtained data were analyzed and interpreted: flow rate, water cut, bottomhole and wellhead pressure, bottomhole temperature, suspended particulate matter (SPM) concentration, drain level, expedition pump frequency and wellhead samples. At the planning stage of the experiment, a formation zone of interest (ZOI) was selected with a set of first six pilot wells, where the geomechanical effects during the flowback period have the greatest impact on production. The field experiment program, which contains the wellhead choke steps sequence of diameters and duration of the well clean-up periods for two scenarios - "aggressive" and "smooth" for particular well. In addition to the choke schedule during eruptive period, there is a need to continue the recommended well startup after the ESP run in hole (RIH). Representativeness and repeatability conditions of field tests were formulated, comparison metrics were developed in order to standardize, normalize and estimate the well performance of the well startup a. We carried out the design of a field experiment proposed in 2019 (Osiptsov et al., 2019) and showed in practice that the dynamics of the well flowback and startup affects the well productivity index for a selected ZOI. In addition, we history-matched in-house geomechanical and hydrodynamic in order to quantify the production increase with regardsto different flowback scenarios. Based on the available data, the boundaries of the pressure fluctuations opposite the hydraulic fracturing ports in the horizontal well were calculated in the absence of actual measurements to clarify the conditions for maintaining the conductivity of the fracture.

    Original languageEnglish
    Title of host publicationSociety of Petroleum Engineers - SPE Russian Petroleum Technology Conference 2020, RPTC 2020
    PublisherSociety of Petroleum Engineers
    ISBN (Electronic)9781613997451
    Publication statusPublished - 2020
    EventSPE Russian Petroleum Technology Conference 2020, RPTC 2020 - Virtual, Online
    Duration: 26 Oct 202029 Oct 2020

    Publication series

    NameSociety of Petroleum Engineers - SPE Russian Petroleum Technology Conference 2020, RPTC 2020

    Conference

    ConferenceSPE Russian Petroleum Technology Conference 2020, RPTC 2020
    CityVirtual, Online
    Period26/10/2029/10/20

    Fingerprint

    Dive into the research topics of 'Field testing of the flowback technology for multistage-fractured horizontal wells: Test results and primary interpretation of the results'. Together they form a unique fingerprint.

    Cite this