Vietsovpetro has been applying hydraulic fracturing in its well since 1994. Starting from 2013, in order to increase a fracture half-length and develop a previously non-drained reserves, the measures aimed on increasing the proppant pumping per 1 meter of net pay have been implemented. Increased mass of the pumped proppant led to active proppant flowback from the bottomhole area with filling up the well bottom and reducing the well flowrate. Physical-chemical method of resin coated proppant (RCP) application was adopted as the main one for preventing the proppant flowback. The article covers the methodology of RCP lab testing in terms of its caking under various reservoir temperatures, describes the results of previously applied RCP, and identifies the reasons of its low efficiency related to noncompliance of proppant characteristics to application conditions. The research describes Vietsovpetro track record in searching and selecting new RCP for various reservoir conditions. The results of performed studies allow updating the engineering-technical requirements to hydraulic fracturing proppants supplied by a Contractor. Moreover, the RCP undergo quality acceptance testing in Vietsovpetro labs in order to correspond to the declared requirements. In 2020, five wells applied RCP for hydraulic fracturing with successful acceptance tests results. To identify shut-in timing for RCP caking, the simulation of temperature build-up has been performed as well as the studies using the bottomhole temperature sensors. The wells registered stable production with no flowback of proppant after the hydraulic fracturing. The promising directions of RCP implementation have also been identified.
References
1. Klevtsov A.S., Grishchenko E.N., Balenko P.S. et al., Features of hydraulic fracturing planning and implementation while developing the low permeable highly dissected Oligocene reservoirs of Vietnam offshore fields (In Russ.), Neftyanoe khozyaystvo, 2020, no. 9, pp. 114–118.
2. Aksenova N.A., Ovchinnikov V.P., Anashkina A.E., Tekhnologiya i tekhnicheskie sredstva zakanchivaniya skvazhin s neustoychivymi kollektorami (Technology and technical means for completing wells with unstable reservoirs), Tyumen': Publ. of TIU, 2018, 134 p.
