Determination of jet pump characteristics during well development
DOI:
https://doi.org/10.31471/1993-9868-2026-1(45)-123-131Keywords:
well development, flow stimulation, well flow rate, permeability of the productive horizon, jet pump, relative pressure, injection coefficient, cavitationAbstract
A method is proposed for the technical and economic justification of the feasibility of using a jet pump to induce the inflow of formation fluid from the productive zone of a production well, based on a statistical analysis of changes in its productivity, the determination of the additional volume of oil produced, and the profit from its sale. In determining the technical and economic indicators, account was taken of the well’s flow rate following development using a jet pump and conventional methods, the actual operating time of the well, and the cost of oil production. During the hydraulic modelling of the well development apparatus, a list of hydrodynamic parameters was identified that must be taken into account when analysing the operation of the ejection system. An analytical relationship has been established that defines the interdependence between the pressure in the sub-packer region, the design features of the hydraulic system, and the physical properties of the flushing fluid. The minimum pressure in the sub-packer zone is ensured when the jet pump is operated in the marginal head mode and with a zero flow rate of the injected fluid. In determining the pressure in the sub-packer zone, the hydrostatic pressure in the wellbore, the magnitude of local hydraulic losses in the jet pump’s working nozzle, and the linear losses in the annular space channel are taken into account. The pressure in the sub-packer zone decreases with an increase in working flow rate and an increase in the ratio of the cross-sectional areas of the mixing chamber and the working nozzle of the jet pump. The limits of application of the proposed hydraulic model are constrained by the possibility of cavitation occurring in the flow path of the jet pump. Using the proposed hydraulic model, an analytical relationship between the design and operating parameters of the wellbore ejection system has been derived, which ensures cavitation-free operation of the jet pump. The proposed hydraulic model can be used during the design stage of the jet pump and for predicting its operating mode during the process of inducing inflow from the productive horizon.
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