Experimental study of the selective impact to the bottomhole formation zone
2022
Fazil Kamal Kazimov
Wells operating from fields in the late stage of development are characterized by watering of a high degree of their production. As the reason for this is the heterogeneity in permeability and consisting of weakly cementing rocks, which lead to the destruction of the bottomhole formation zone (BFZ). As a result, water inflows from the formation to the producing one become intense. And this, in turn, is the reason for the watering of production wells with a high degree. The goal of this article is to occupy high permeability formation water reservoirs with a silicium dioxide composition that regulates the duration of gelation, the development of a plugging composition, and to study the effect on the permeability of the BFZ. Between the sodium silicate and hydrochloric acid, the ongoing reaction is based on gelation for the process of components of the optimal composition and the mixing process is established. In addition to this prepared solution of optimal composition, the characteristics of water and oil filtration were studied by checking in the reservoir model. It has been established that the optimal composition of Na2SiO3 and HCl solution in a ratio of 1:1 mixture after injection at 10-100 °C will harden in 3-22 hours can be used as a plugging material. Since with this composition of the composition with injection into the reservoir from flooded interlayers, the permeability of high-permeability zones sharply decreases, and low-permeability zones increased several times. At the same time, the oil displacement ratio increased by 8-12%.
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