Open AccessBlocking compounds on the basis of condensed dispersions for well killing under complicated mining and geological conditions
Author(s) -
Р.А. Гасумов,
S. V. Kostyukov
Publication year - 2019
Publication title -
izvestiâ vysših učebnyh zavedenij. neftʹ i gaz
Language(s) - English
Resource type - Journals
ISSN - 0445-0108
DOI - 10.31660/0445-0108-2019-2-59-67
Subject(s) - permeability (electromagnetism) , blocking (statistics) , swelling , geology , chemistry , mineralogy , chemical engineering , materials science , composite material , computer science , membrane , computer network , biochemistry , engineering
The article is devoted to the results of laboratory studies of blocking compounds with a condensable solid phase based on calcium. The features of such systems have been revealed and their positive characteristics have been determined. It made it possible to conclude that such systems compounds are promising as blocking compounds for usage in wells with complicated mining and geological conditions (abnormally low reservoir pressures, in reservoirs with complex mineralogical and chemical composition with a high clay content fractions, with a highly fractured bottomhole formation zone, etc.). Based on the data obtained, we have developed blocking compounds with a condensable solid phase (the patent RU 2543003 and the patent RU 2651687), which have high blocking properties (withstand pressure drop up to 20 MPa) and ensure the preservation of reservoir properties (permeability recovery coefficient is more than 95 %) and inhibition of clay minerals swelling. In addition, as a result of studies we have found that for the blocking of productive deposits with a nonuniform permeability (for reservoirs with an average permeability about 1 Darcy) the usage of compounds with a close to stoichiometric ratio of precipitating components with a condensed solid phase content about 11 wt. % is optimal.