One of the solutions of water-alternating gas injection technology and utilizing of associated petroleum gas enhancement is application of pump-ejector system technology, which uses a liquid-jet gas pump (LJGP) as a water and gas mixer. This paper is devoted to the test bench studies of the LJGP’s performance characteristics with change of the mixing throat’s length at excess pressures of the ejected gas. As a result of the bench studies, it was obtained that the excess pressures of the ejected gas Pin
require a different approach when choosing the optimum length of the LJGP’s mixing throat, as compared to atmospheric pressure. So, it was determined that at Pin from 0.05 to 0.18 MPa, a long mixing chamber should be chosen, and Pin from 0.18 to 0.6 MPa, the optimal length is medium. It was also obtained that with an increase in Pin
, the optimum working range of the mixing throat lengths increases, which makes it possible to select the mixing throat in wider ranges, without losing the efficiency of the LJGP. With the optimal length of the mixing throat, the highest gas injection coefficients were in the range of Pin
= 0.2 – 0.5 MPa.
In this paper, a bench study of the pump-ejector system for simultaneous water and gas injection (SWAG) was conducted. For these purposes, a pump-ejector system stand was used. A differential pressure gauge was used to determine the gas flow at the ejector intake. According to the results of differential manometer calibrations, a new formula was obtained which reduces its inaccuracy to 1% at pressures below 0.6 MPa. In addition, according to the pressure-energy diagrams, it was determined that the gas injection with excess pressures in the ejector suction chamber significantly increases the efficiency of the pumping-ejector system overall.
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