Preparation for the introduction of SWAG at the fields of PJSC «Tatneft»

Abstract

The results of laboratory studies of filtration processes on models of a terrigenous reservoir are presented in order to develop optimal compositions for simultaneous water and gas injection and foam assisted water alternating gas injection on the reservoir. The experiments were carried out on rock samples drilled from the core of terrigenous deposits of the Kynovsko-Pashiy horizon. The use of water-gas mixtures with foam-forming surfactants taking into account the field conditions of the fields of PJSC TATNEFT has been established will make it possible to obtain the greatest increase in oil recovery. Studies of the multiplicity and stability of foam systems have shown that non-ionic foaming surfactants TN-PO-1, TN-PO-2 and AF9-12 are best suited for use in FAWAG of the reservoir. The results of studies of the properties of foams depending on the concentration of surfactants are presented, recommendations are given on the use of specific reagents for the implementation of FAWAG, taking into account the conditions of specific fields. The use of SWAG and FAWAG technologies is not only increase oil recovery, but also significantly reduce the volume of irrationally used associated petroleum gas, which is one of the most important tasks for sustainable development goals. Keywords: enhanced oil recovery; filtration studies; simultaneous water and gas injection; foam assisted water alternating gas injection; foaming surfactants.

Waterflooding, water-gas method and generation of carbon dioxide in the reservoir – methods of enhanced oil recovery and technology development

“…Pump-ejector systems (PES), namely liquid-gas ejector and booster pump are dispersing devices. By grinding gas bubbles and increasing the mixture injection pressure into the formation, PES help to suppress the coalescence of gas bubbles [5]. However, during the injection process, it is impossible to avoid the separation of the mixture into individual components without the addition of agents, the purpose of which is to suppress the adhesion of gas bubbles.…”

“…To regulate the operation of the system with varying gas flow rates, the possibility of frequency regulation of the rotation of the pump shaft is proposed. In [5], experimental studies have shown that for the conditions of a particular field, when preparing a water-gas mixture, it is necessary to choose a surfactant based on the properties of the foams that are obtained by adding each specific surfactant and their ability to displace residual reserves. It was established that the addition of surfactants has a positive effect on the operation of the booster pump.…”

“…Of course, such a wide and successful application of the waterflooding technology is due to its own manufacturability during implementation, as well as the low cost and availability of large volumes of the agent injected into the reservoir -water. Along with high efficiency, non-stationary waterflooding technology creates serious problems in the development and operation of oil fields [1][2][3][4][5][6][7][8][9][10]. The problems are of both natural and technogenic origin, leading to premature breakthrough of injected or IOP Publishing doi:10.1088/1755-1315/1212/1/012038 2 formation water to production wells with subsequent watering of their production, which in turn provokes the formation of stagnant and poorly drained zones.…”