×

Downhole jet pump with multiple nozzles axially aligned with venturi for producing fluid from boreholes

  • US 4,744,730 A
  • Filed: 03/27/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 03/27/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. A downhole jet pump for producing fluid from a wellbore;

  • said pump has a pump body, an upper and lower end, and a longitudinal axis;

    said pump body includes means forming a packer nose assembly at the upper end thereof by which said pump can be circulated into and out of the wellbore;

    a longitudinally extending axial bore formed within said main body, said axial bore is separated into an upper power fluid passageway and a lower formation fluid passageway to receive power fluid from a source located above the surface of the ground and to receive formation fluid from the lower end of the borehole;

    means mounting a nozzle assembly at the lower end of said pump body, said nozzle assembly includes a plurality of radially spaced nozzles which are circumferentially arranged about the longitudinal axis of said pump body;

    said nozzles each have a jet end spaced from an inlet end, passage means connecting each nozzle to the upper power fluid passageway of the axial bore;

    a venturi assembly axially aligned respective to said nozzle assembly, said venturi assembly includes a plurality of venturi each having an inlet and outlet;

    a tubing string extending into the wellbore into communication with a production zone, means forming a pump cavity located downhole in the borehole at the end of the tubing string for removably receiving said pump in sealed relationship therewithin;

    an annulus is formed between said tubing string and the borehole through which produced fluid admixed with spent power fluid is conducted uphole to the surface of the ground;

    seal means positioned about said pump body by which said pump body and said cavity jointly form a suction annulus and a produced fluid annulus spaced from one another by said venturi assembly, said suction annulus is concentrically arranged about the jet end of said nozzle assembly and the inlet end of the venturi assembly, and thereby provides formation fluid flow into the inlet end of the venturi assembly whereupon the formation fluid is forced to flow through the venturi assembly and into said produced fluid annulus located within said pump cavity;

    means by which said inlet end of each said nozzles of the assembly is directly connected to said power fluid in the axial passageway such that power fluid can flow into said inlet end, through the interior of said nozzle assembly, and out of said jet end thereof;

    a formation fluid inlet means connected at the lower end of said axial bore, means forming a flow passageway extending from said formation fluid inlet means, through said lower formation fluid passageway of said axial bore, and into said suction annulus;

    said venturi assembly is of annular construction and sealingly engages the interior of the cavity wall and is spaced from said nozzle assembly;

    said inlet end of each said venturi is placed adjacent to said jet end of each said nozzle;

    said suction annulus is separated from the produced fluid annulus by said venturi assembly;

    an annuluar member spaced above said venturi asembly;

    said produced fluid annulus commences in proximity of the venturi outlet and extends to said annular member; and

    an outlet port formed in said cavity and connected to said produced fluid annulus for conducting mixed fluid flow away from the jet pump, into the annulus between the tubing and the wellbore, and towards the surface of the ground.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×