Influence of suspended solid particles in injected water on reservoir properties of low-permeability formations

UDK: 622.276.43.001
DOI: 10.24887/0028-2448-2023-2-84-88
Key words: solid suspended particles, core, filtration experiment, permeability, clogging, suffusion, granulometric composition, bottomhole treatment
Authors: I.R. Safiullin (RN-BashNIPIneft LLC, RF, Ufa), M.G. Volkov (RN-BashNIPIneft LLC, RF, Ufa), A.I. Voloshin (RN-BashNIPIneft LLC, RF, Ufa), V.P. Miroshnichenko (RN-Yuganskneftegas LLC, RF, Nefteyugansk), G.A. Shchutsky (RN-Yuganskneftegas LLC, RF, Nefteyugansk), R.R. Sharapov (RN-BashNIPIneft LLC, RF, Ufa), N.V. Garayeva (RN-BashNIPIneft LLC, RF, Ufa), A.V. Fakhreeva (Ufa Institute of Chemistry of Ufa Federal Scientific Center of RAS, RF, Ufa)

Oil companies are now focusing more and more on the development of tight reservoirs, partly due to the depletion of oil reserves in traditional reservoirs. An example is the transition of development to low-permeability formations (less than 10-3 mkm2) at the N field in Western Siberia. The efficiency of the development of low-permeability reservoirs of an oil field is related to the efficiency of maintaining reservoir pressure provided by the injection of water from different sources and, accordingly, different quality. It is well known that the presence of total suspended solids (TSS) in the injected water, the processes of interaction of water with the reservoir rock and the compatibility of water with reservoir water are negative factors affecting the efficiency of water injection into the reservoir. The article considers the results of filtration tests with different content of TSS in water. Analysis of the results showed the ambiguity of the ongoing processes in the pore medium, possibly associated with the strength of the framework and the structure of the pore space, with the mineral composition of the rock, with the processes of particle association. The analysis showed that the porous medium is clogged not only by the introduced TSS, but also by rock particles that are formed as a result of the interaction of water and rock. In this regard, for the effective development of low-permeability formations, it is proposed to control the level of TSS and their size to a level that ensures their free passage in a porous medium. In addition, it is shown that measures to restore the injectivity of injection wells using acidic compositions should take into account the properties and composition of minerals in the bottomhole zone of wells and TSS.


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