APPLICATION OF THE METHODOLOGY FOR STUDYING THE CHARACTERISTICS OF A NEAR-BIT JET PUMP FOR TEMPORARY ISOLATION OF A PRODUCTIVE RESERVOIR

Abstract

Link for citation: Melnikov A.P., Buglov N.A. Application of the methodology for studying the characteristics of a near-bit jet pump for temporary isolation of a productive reservoir. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.176-184. In Rus. Relevance. The efficiency of oil and gas wells depends on the quality of work at the stage of completion of wells, namely, on the performance of the primary opening of the productive reservoir. One of the main tasks when opening a productive reservoir is to preserve the natural properties of a productive reservoir. This problem can be solved by temporarily isolating the formation by colmatation. The idea of using a jet pump in the layout of the bottom of the drill string for crushing the sludge and further feeding it to the colmatator in order to temporarily isolate the productive reservoir is quite interesting. This makes it possible to replace the metal-intensive ground equipment that is used for such tasks. Purpose: checking the adequacy of the previously obtained dependencies of the jet pump pressure on the injection coefficient, angular and eccentric mixing of the working nozzle, as well as on the roughness of the flow part of the mixing chamber and the diffuser. Object: near-bit jet pump with angular and eccentric displacement of the working nozzle relative to the central axis of the mixing chamber. Methods: factorial experimental study of the characteristics of a high-pressure jet pump using a developed laboratory installation. Results: The authors have proposed the method of experimental investigation of the main characteristics of the near-bit jet pump. The jet pump is designed for crushing the injected sludge directly in the mixing chamber, and further feeding it to the colmatator to provide temporary isolation of the bottomhole zone during the initial opening of the formation. The destruction of the sludge occurs with the help of a working jet, which is directed at the wall of the mixing chamber. The flow direction is set by the angular and eccentric displacement of the jet pump nozzle. The results of the study confirmed the adequacy of the previously obtained pressure characteristics of a high-pressure jet pump. The pressure characteristics take into account the geometric parameters of the flow part of the near-bit jet pump.

Keywords

• Research methodology
• factorial experiment
• high-pressure jet pump
• adequacy check
• pressure coefficient
• laboratory bench