Technologies and technical devices for annual regulated flooding of a productive strata

Abstract

Different systems of stratal flooding by mineral or fresh water into oil bearing formation are used today to enhance reservoir recovery. At low temperatures, 25 degrees below zero and lower, there is a great possibility of freezing of the well head equipment due to cyclic flooding or separate horizontal flooding, lessening injection capacity of the well, emergency stops in flooding, due to water pipe breakage or power cutting off. Besides the wells, crossover bends from water injection wells to the pipe header, and stagnation zones of the embedded in grooves pipes can freeze. According to expert estimation of PJSC "Tatneft" specialists, the amount of frozen injection stations is more than 500 wells per year. Due to the urgency of the issue technological measures have been developed to prevent oil-field equipment freezing.

Ecological Consequences of Reservoir Water and Drill Cuttings Discharging in the Sea Continental Shelf

“…The composition of drill cuttings includes previously used drilling fluid with lost technical properties. The main components of drilling fluids are fluids (water, oil and other organic fluids [10,11]) and barium sulfate. To improve the physicochemical composition of the drilling fluid [12], various additives are used: thickeners (e.g., polyacrylates, other organic polymers), emulsifiers (e.g., alkyl sulfonate acrylate and polyethylene oxide) and deflocculants.…”

Device Development to Implement Pulsed Transient Flooding of Hydrocarbon Reservoirs

“…For completeness of laboratory experiments, three values of the length of the working body were selected -80, 120, 160 mm. With a fluid flow rate of 15-20 l/s, the most optimal length of the working body is l = 80 mm, since the device creates a frequency range of 700-930 Hz [7,8]. This frequency range is optimal on the basis of laboratory and experimental studies conducted on the stand and described in [9].…”

Estimation of The Wells Hydrodynamic Drag Level Based on Wells Geophysical Survey Data

“…The analysis of the studies results presented in the works [1][2][3][4][5][6][7][8][9] showed that the efficiency of the process of oil displacement by water is largely determined by the degree and nature of the interaction of producing and injection wells.…”