Self-excited jet stimulation tool for cleaning and stimulating wells

摘要

A self-excited jet stimulation tool for cleaning and stimulating wells includes an elongated tubular first member adapted on an upper end for connection to a running string. The first member includes an upper portion with a central bore open to a top of the tool, and a lower portion having a cylindrical shaped cavity open to a bottom surface of the first member. The cylindrical cavity is internally threaded in a lower portion. The central bore of the first member is open to the cylindrical cavity for communication of fluids supplied by the running string. The tool further includes an elongated tubular second member having a top with a central flat circular portion and a central bore with a diameter larger than the diameter of the central bore of the first member but less than the diameter of the cylindrical cavity of the first member. A conical shoulder extends downwardly and outwardly away from the central flat circular central portion and terminates in a flat annular ledge extending beyond the termination of the conical shoulder. An upper portion of the second member is externally threaded and receivable in the internally threaded lower portion of the first member. The second member has a lower nose portion with at least one discharge port connected by a passageway to the central bore of the second member. When the tool is assembled with the upper portion of the second member threadedly engaged in the lower portion of the first member an internal oscillation chamber is formed therein.