Downhole jet pump with multiple nozzles axially aligned with venturi for producing fluid from boreholes
First Claim
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.
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Accused Products
Abstract
A downhole pump of the jet type is placed below the fluid level in a wellbore and is used to produce fluid from the wellbore by employment of a power fluid source located above the surface of the ground. The power fluid flows downhole to the pump and through the jet pump assembly to cause a pumping action. The jet pump includes a suction chamber formed about a nozzle assembly. The nozzle assembly is spaced from a venturi throat. The venturi throat diverges in a direction away from the nozzle. The nozzle is located close to the bottom of the pump adjacent the formation fluid inlet at a position which precludes contamination thereof with debris which may otherwise fall downhole into the nozzle. The power fluid exits from the nozzle and enters the inlet of the venturi, causing produced fluid to be pulled into the throat entrance and mixed with the power fluid. The mixed fluids continue to flow through the throat and out the venturi as the mixed fluids are forced to continue through the pump and then uphole to the surface of the earth. The pump includes a single nozzle as well as multiple nozzle and throat combinations.
65 Citations
3 Claims
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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.
- said pump has a pump body, an upper and lower end, and a longitudinal axis;
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2. A jet pump for producing fluid from a wellbore having formation fluid located in the bottom thereof;
- said pump comprising a pump body having an upper end opposed to a lower end, and a longitudinal extending axial bore formed therein having an upper marginal end to receive power fluid from a source located above the surface of the ground and a lower marginal end to receive formation fluid from the bottom of the borehole;
a nozzle assembly mounted at the lower end of said pump body, said nozzle assembly includes a plurality of individual 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 said inlet end of each said nozzle to the upper marginal end of said axial bore to provide each nozzle with a source of power fluid;a tubing string forms an upper borehole annulus which is separated from the lower borehole by a packer means so that produced fluid from the pump can be exhausted into and flow up the borehole annulus;
means forming a pump cavity located dowhole in the tubing string for removably receiving said pump in sealed relationship therein;a venturi assembly mounted to said main body;
said venturi assembly is axially aligned with respect to said nozzle assembly and has a plurality of venturi, each having an inlet end and an outlet end;
said inlet end of each said venturi is placed adjacent to said jet end of said nozzle assembly;
said venturi assembly has a large outside diameter greater than the outside diameter of the nozzle assembly;
an annular member spaced from said venturi assembly and forming an annular produced fluid chamber therebetween;
seal means on the exterior of said venturi assembly by which said pump body and cavity form a suction annulus and said annular produced fluid chamber by which formation fluid is placed around the nozzle outlets and venturi inlets, and which separate the formation fluid, power fluid, and produced fluid;said seal means, pump body, and cavity form said suction annulus concentrically about the jet end of said nozzle assembly and within said pump cavity at a location near the lower end of said pump body;
whereby,power fluid flows into said axial bore by way of a power fluid inlet means, through the nozzle assembly, out of said jet end thereof, into the entrance of said venturi assembly thereby forcing power fluid admixed with production fluid into the annular produced fluid chamber; the upper marginal end of said axial bore is separate from the lower marginal end thereof, a formation fluid inlet means connected to said axial bore at the lower end of said pump body, and separated from said power fluid inlet means;
means forming a flow passageway extending from said formation fluid inlet means into said suction annulus;said seal means includes a seal located on said venturi assembly by which the formation fluid flow path about the venturi inlets is spaced from the produced fluid flow path about the venturi outlets, said produced fluid flow path commences in proximity of the venturi outlet end and extends to a location adjacent to said annular member;
an outlet port formed in said cavity connected to said annular produced fluid chamber for conducting mixed fluid flow away from the jet pump, through said tubing string, up the borehole annulus and towards the surface of the ground. - View Dependent Claims (3)
- said pump comprising a pump body having an upper end opposed to a lower end, and a longitudinal extending axial bore formed therein having an upper marginal end to receive power fluid from a source located above the surface of the ground and a lower marginal end to receive formation fluid from the bottom of the borehole;
Specification