«Proceedings of Gubkin University»

Development of jet equipment for cleaning borehole and bottom-hole zone in cavitation conditions

UDC: 622.276.6:532.525
DOI: -

Authors:

¹ Kuban State Technological University, Krasnodar, Russian Federation

Keywords: cavitation, oil wells, bottom-hole cleaning, jet installation, cavitation generator, sand-clay plugs

Annotation:

The borehole and bottom-hole area must be cleaned before all workover operations. From year to year, the number of workover operations of depleted oil fields, such as, for example, the oil fields of the Krasnodar region, is growing. However, known systems are often ineffective in processing cemented and clay-sand plugs due to insufficient hydrodynamic action. For some time now, attention has been paid to the possibility to utilize cavitation to clean the walls of wells from contamination. This article presents a new methodology for the design of cavitation systems for jet cleaning of borehole developed on the basis of the analysis of new achievements in the theory and practice of cavitation technologies. It is shown that for the fragmentation of mineral aggregates under the action of cavitation, from which borehole plugs are composed, an energy supply in the range of 12–60 kJ/l is required, and a hydrodynamic cavitation generator provides the creation of a stable effective cloud of cavitation bubbles with a cavitation number in the range of 0,7–1,7. Optimal cavitation generators have the shape of a Venturi tube with a 6–7° angle of divergence of the conical discharge section. A number of submersible jet devises have been developed that implement cavitation flow. The novelty and uniqueness of the developed devices is confirmed by patents for the invention. The devices have passed pilot tests on wells.

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