Abstract
Liquid-gas ejector is a hydraulic machine, in which the energy exchange of active fluid (liquid) and passive fluid (gas) occurs through their direct mixing. Bench research have been carried out, in which the active fluid was injected in the nozzle of LGE, a pressure of active and passive fluids, and an output pressure at different geometrical parameters (such as nozzle diameter, the diameter and length of the mixing chamber) were controlled, pressure and power characteristics were constructed and analyzed. The stand consists of a submersible multistage centrifugal pump, ejector, tank and separator. Laboratory stand has unique capabilities and provides a power pressure in the nozzle of the ejector up to 20 MPa, and an intake pressure (in the suction chamber) - up to 5 MPa. This stand is fully simulates the use of an ejector in well's and field conditions.
The use of liquid-gas ejector enables applying the technologies of water-alternating gas impact on the layer, hydro-jet method of operating wells, tandem technology of the jet device and ESP in the well. Also, the use of LGE enables to utilize associated gas by injection it into the reservoir (implementing the method of enhanced oil recovery) or in the pipeline for its transportation without flaring.
The main results are the characteristics of LGE with high efficiency in various operating conditions. The region of operation parameters of the ejector, where the highest efficiency values were achieved, was established.
LGE are easy to use, they have small overall dimensions and weight, they are able to transport corrosive fluids and to reach high efficiency; and the problem of utilization of associated gas can be solved using them. They could compete with expensive compressors, multi-phase pumps and booster units.
