received by the International Bureau on 30 September 2014 (30.09.2014).

Please amend the claims as follows:

1. A dual mode downhole jet pump for positioning in a well on a tubular string to pump fluids from the well to the surface, comprising:

an exterior pump bousing defining an elongate housing passageway therein having a central axis and extending from m upper portion of the pump housing that is fluidically cotmectable to a tubular string to a lower portion of the pump housing for receiving fluids from a geologic formation;

a carrier receivable to seat within the pump housing coincident with the central axis of the housing, the carrier including:

a proximal end with an exterior seal;

a distal end with an exterior seal;

a power fluid jet no/z!e intermediate the proximal and distal ends and having an exterior sealed to the carrier and having a jet passageway therein for increasing fluid velocity of power fluid transmitted through the jet nozzle;

a mixing tube fluidly downstream from a discharge of the jet no/zle and having an elongate mixing tube passageway for receiving power fluid exiting from the jet nozzle mixed with formation fluid from one or more potts in the carrier intermediate the proximal and distal ends and disposed radially to the central axis for feeding formation fluid radially inwardly intermediate the discharge of the jet nozzle and an inlet to the mixing tube;

a diftuser fluidly downstream from the mixing tube and sealably engaged by the seal at the distal end of the carrier in the first seated position of the carrier within the pump housing, and upstream of the jet nozzle and sealably engaged by the seal at the proximal end of the carrier in the second seated position of the carrier within the pump housing, fine dit Tuser having a curved flow path therein, the diffuser sealed to the exterior pomp housing and the flow path in the diffuser being in communication with a throughport in the pump housing, with a circumferential spacing between an exterior surface of the diffuser and an interior surface of the pump housing defining a flow path for formation fluid (lowing to the one or more ports in the carrier radial to the central axis; and

a retainer receivable in a proximal end of the pump housing to secure the carrier in the second seated position within the pump housing, the retainer installable into a proximal end of the pump housing using conventional tools that can be run through the tubular string;

wherein in a direct flow mode, th carrier is received along the central axis of the pump housing in the first seated position to engage the seal at the proximal end of the carrier with the tubular string and to engage the seal at the distal and of the carrier with the diffuser and, upon use, to receive a flow of power fluid from the tubular string and to draw fluid from the geologic formation through the radial pom and into the mixing tube to mix with the power fluid and to flow through the diffuser and into an annular space around the pump housing to flow to a surface for recovery;

wherein in a reverse flow mode, the carrier is received along the central axis of the pump housing in the second seated position to engage the seal at the proximal end of the carrier With the diffuser and to engage the seal at the distal end of the carrier with the tubular string nd, upon use, to receive a flow of power fluid from the annular space around the pump housin to draw fluid f om the geologic formation through the radial ports and into the mixin tube to mix with the power fluid and to flow through the tubular string to the surface for recovery; wherein in the direct flow mode, a positive fluid pressure in the tubular string maintains the carrier in the first seated position within the pump housing, and the carrier can be retrieved to the surface by reversing the flow direction by pumping water down the annular space around the tubular string and back to the surface through the tubular string to carry the carrier to the surface for removal ;

wherein in the reverse flow mode, the retainer secures the carrier in the second seated position within the pump housing to prevent unwanted retrieval of the carrier to the surface upon the flow of power fluid from the annular space around the pump housing to draw fluid f om the geologic formation through the radial ports and into the mixing tube to mix with the power fluid and to flow through the tubular string to the surface for recovery.

2. The jet pump as defined in Claim 1 , further comprising:

an adjustment mechanism for adjusting an axial position between the jet nozzle with respect to the mixing tube.

3. The jet pump as defined in Claim 1, wherein the adjustment mechanism is a selected axial length sleeve supporting the jet nozzle.

4. The jet pump as defined in Claim 1 , further comprising:

at least one of a temperature probe and a pressure probe supported in the well from the pump housing, such that retrieval of the pump housing to the surface retrieves the probe.

5. (Cancelled) 6, The jet pump as defined in Claim 1 , farther comprising;

an inlet valve proximal to a distal end of the pump homing for controlling formation fluid flow into the pump housing.

7. A downhole jet pump for positioning in a well on a tubular string io pump fluids from the well to the surface, comprising:

an exterior pump housing connectabie to a tubular string at a proximal end and defining an elongate housing passageway (herein having a central axis and extending from an upper portion to a lower portion of the pump housing;

a power flui jet noz/Je releasably supported within a carrier having an exterior seal adapted to engage and seal with die pump housing when die carrier is axially received from above the upper portion and within the housing passageway, (he jet nozxle having a jet passageway therein tor increasing fluid velocity of power fluid transmitted through the jet nozzle;

a mixing tube supported within the carrier and fluidlv downstream from the jet no¾tte and having an elongate mixing tube passageway gyeceivg fluid exiting die iet nozzle;

a difluser supported in the lower portion of the pump housing and having a curved (low path (herein, the difluser sealed to the pump housing and the flow path in the diffuser being in communication with a throughport in (he pump housing, a circumferential spacing between an exterior surface of the diffuser and an interior surface of the pump housing defining a flow path for formation fluid flowing irom beneath the lower portion of (he housing to a space intermediate an exit of the jet nozzle and an entry to the mixing tube; and one or more openings in the carrier for passing formation fluid from the How path radially inward to the space intermediate the jet nozz e and an entry to the mixing tube;

a proximal seal on a proximal end of the carrier to engage and seal with one of the upper portion of the pump housing, in a first seated position, and the diffuser, in the second and inverted seated position, such that the carrier supporting t e jet nozzle and the mixing tube may be received in the passageway for direct flow mode, wherein power fluid is received to the jet nozzle of the jet pump through the tubular string, and also in a reverse flow mode, wherein power fluid is received to the jet nozzle of the jet pump through the throughport in the housing; a distal seal a distal end of the carrier to engage and seal with one of the diffuser,, in the first seated position, and the upper portion of the housing, in the second and inverted seated position, such that the carrier supporting the jet nozzle and the mixing tube may be received in the passageway ibr direct flow mode, wherein power fluid is received to the jet nozzle of the jet pump through the tubular string, and also in a reverse flow mode, wherein power fluid is received to the jet nozzle o f the jet pump through the throughport in the housing; and

a retainer installable in the jet pump through the tubular string using a conventional wireline tool to secure the carrier within the passageway of the housing to prevent unwanted retrieval of the carrier to the surface through the tubular string during reverse flow mode.

8. The jet pump as defined in Claim 7, further comprising:

an adjustment mechanism for adjusting an axial position between the jet nozzle with respect to the mixing tube,

9. The jet pump as defined in Claim 8, wherein the adjustment mechanism is a selected axial length sleeve supporting the jet noz*le. .10. The jet pump as defined in Claim 7, farther comprising;

at least one of a temperature probe and pressure probe supported in the well from the pump housing such that retrieval of the pump housing to the surface retrieves the probe.

1 1. The jet pump as defined in Claim 7, further comprising:

an inlet valve in a distal end of the pump housing for regulating formation fluid flow into the flow path of the pump housing.

12. A method of operating a downhole jet pump positioned in a well on a tubular string to pomp fluids from the well to the surface, comprising:

providing an exterior pump housing defining an elongate housing passageway therein having a central axis and extending from an upper portion to a tower portion of the pump housing;

positioning a carrier having a jet nozzle and an aligned mixing tube, within the passageway of the pump housing, the carrier having a proximal seal and a distal seal, the jet nozzle having a jet passageway therein for increasing fluid velocity of power fluid transmitted through the jet nozzle, and the earner havin a mixing tube fiuidly downstream from an ex it of the jet nozzle, the mixing tube havin an elongate mixing tube passageway to receiving fluid exitin from the jet nozzle and formation fluid entering the mixing tube through a radial port disposed intermediate the exit of the jet nozzle and an entry to the mixing tube;

providing a diffuser having a curved flow path therein, the diffuser sealed to the exterior pump housing being in communication with a tluoughport in the pump housing, a circumferential spacing between an exterior surface of the diffuser and an interior surface of the pump housing defining a flow path for formation fluid flowing to the radial port intermediate the jet nozzle and the mixing tube;

receiving the carrier in a direct flow mode with the jet nozzle proximal to the upper portion of the pump housing and the mixin tube proximal to the lower portion of the pump housing containing the diffuser;

producing formation fluids from the well by providing pressurized power fluid io ihe jet nozzle through the tubular string to draw formation fluids through the flow path, the radial po , and into the mixing tube tor ejection through the diffuser to an annular space surrounding the pump housing and the connected tubular string;

reversing the flow to provide pressurized power fluid through the annular space, (he throughport, and the diffuser to displace the carrier through the tubular string to the surface; inverting the carrier;

inserting the carrier into the tubular string and the surface;

displacing the carrier down the tubular string to a seated position within the passageway of the pump housing;

securing the carrier within (he pump housing by installing, using a conventional wireline tool, a retainer to secure the carrier in the seated position within the pump housing; providing pressurized power fluid through the annular space, the throughport, and the diffuser to the jet nozzle; and

continuing to produce formation fluids from the well by providing pressurized power fluid to the jet nozzle through ihe annular space and the diffuser to draw formation fluids through the flow path, the radial port, and into the mixing tube for ejection through the tubular string to the surface. 13. The method as defined in Claim 12 , further comprising:

adjusting an axial position between the jet no/ale with respect to roe mixing tube.

14. The method as defined in Claim 12, further comprising:

supporting one of a temperature probe and pressure probe in the well from the jel pump housing such that retrieval of the jet pump housing to the surface retrieves the probe.

15. The method as defined in Claim 12, wherein the carrier is sealed to the pump housing and to the diifuser, such (hat there is limited axial movement of the carrier with respect to the pump housing and the diffuser.

J 6. The method as defined in Claim 12, further comprising:

positioning an inlet valve below the pump housing for regulating formation fluid flow within the pump housing.