Increasing the operating time of electrical submersible pumps by using self-cleaning filters

Abstract

Introduction. The article considers issues relating to electrical submersible pumps (ESP) work under complicated operating conditions caused by a high content of solids in the pumped borehole fluid. Factors that cause or exacerbate these complications are also studied. The article justifies the urgency of increasing the operating time of submersible equipment under complicated operating conditions. Methods of research includes analyzing engineering and process approaches to ESP protection from a detrimental effect of solid particles. Within these approaches, specific ways of protecting borehole equipment from hydroabrasive wear are considered. It is concluded that today, in terms of economic indicators and efficiency, borehole and intake filters, mainly slotted, are preferable for ESP protection. The main advantages and disadvantages of known mass-produced slotted filter designs are considered. Results. The process of production tubing deformation in the course of pumping with ESP is considered and mathematically described. An engineering solution is proposed for a selfcleaning borehole slotted filter which makes it possible to eliminate the main disadvantages of slotted filters, specifically low dirt capacity and the need for tripping operations aimed at restoring the filter’s permeability. The method is given for calculating the deformation of the filter element within the slotted filter as part of the ESP below ground. Conclusions. The use of the described self-cleaning filter will increase the ESP operating time in wells characterized by solids circulation. Reducing trippings, and therefore the downtime of wells, during the operation of ESP with slotted filters will significantly reduce the costs of oil producing enterprises and increase oil production profitability.