Fluid self-excited pressure pulse oscillation generating device and using method

Abstract

The invention relates to a fluid self-excited pressure pulse oscillation generating device and a using method. The oscillation generating device comprises a central pipe, a fixed sleeve and a movablesleeve, wherein the fixed sleeve and the movable sleeve are arranged on the outer side of the central pipe in a sleeving mode, an annular gap with an opening facing the movable sleeve is arranged between the fixed sleeve and the central pipe, and a through hole for communicating the annular gap with an inner cavity of the central pipe is formed in the pipe wall of the central pipe; and the movablesleeve comprises an opening and closing section and an extending section, the opening and closing section is in sealed sliding connection with the central pipe, an annular cavity is formed between the opening and closing section and the central pipe, the cross section area of the annular cavity is larger than that of the annular gap, and a nozzle for communicating the annular cavity with the inner cavity of the central pipe is further arranged on the pipe wall of the central pipe. According to the fluid self-excited pressure pulse oscillation generating device and the using method, the movable sleeve moves up and down in a reciprocating mode by utilizing the pressure difference, so that the nozzle is alternately blocked and opened, power liquid is frequently and alternately sprayed to a production layer through the nozzle to generate pressure pulses, and the plugging removal effect of an oil-water well can be greatly improved.

Description

technical field [0001] The invention relates to the field of downhole supporting devices for oil and water well plugging removal operations in oil fields, in particular to a fluid self-excited pressure pulse oscillation generating device and a use method. Background technique [0002] At present, the technical measures for oil well stimulation and oil well injection are acidizing and fracturing. The purpose of acidizing is to remove the blockage in the production layer and its cement sheath and the wellbore passage, so as to improve the permeability between the formation and the wellbore; The purpose of fracturing is to use high-pressure power fluid to artificially create fractures in the production layer of oil (water) wells and fill them with proppant to improve their permeability. Vibration plugging removal process technology is currently applied in some oilfields in specific blocks such as low-permeability oilfields. Although some effects have been achieved in the field,...

AI Technical Summary

Problems solved by technology

Vibration plugging removal process technology is currently applied in some oilfields in specific blocks such as low-permeability oilfields. Although some effects have been achieved in the field, there are various degrees: high requirements for well conditions, poor work reliability, and technical problems. It is cumbersome, the structure of supporting tools is complicated, and the effective power of plugging is small, etc.

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