Patent ID: 6029746
Filing Date: 2000-02-29
Classification: B08B,E21B

Abstract:
A self-excited jet stimulation tool for use inside a well, said jet tool comprising:an elongated tubular first member adapted on an upper end for connection to a running string, said first member comprising:an upper portion with a central bore open to a top of the tool, anda lower portion having a cylindrical shaped cavity open to a bottom surface of the first member, said cylindrical cavity having an internal diameter larger than the diameter of the central bore of the upper portion, said central bore of the first member open to the cylindrical cavity for communication of fluids supplied by the running string; andan elongated tubular second member comprising:a top having 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,an upper portion receivable in the cylindrical cavity of the first member, anda lower nose portion having at least one discharge port connected by a passageway to the central bore of the second member;wherein said tool being assembled with the upper portion of the second member received in the cylindrical cavity of the lower portion of the first member thereby forms an oscillation chamber having a height equal to about three times the diameter of the central bore of the upper portion of the first member.