Compact cable suspended pumping system for lubricator deployment

1. A method of installing or retrieving a pumping system into or from a live wellbore, comprising:

connecting a lubricator to a production tree of the live wellbore; and

raising or lowering a downhole assembly of the pumping system from or into the wellbore using the lubricator,

wherein:

the downhole assembly comprises: a high speed motor, an isolation device operable to engage production tubing disposed in the wellbore, and a high speed pump,

the high speed pump comprises a rotor having one or more helicoidal vanes,

the high speed pump further comprises a stator having a housing and a diffuser, and

a Venturi passage is formed between the rotor and the housing and between the housing and the diffuser.

2. The method of claim 1 , further comprising:

deploying a running tool into the tree using the lubricator; and

engaging the running tool with a hanger of the pumping system,

wherein the downhole assembly is raised by:

raising the running tool and hanger into the lubricator, thereby also raising the downhole assembly of the pumping system;

raising the running tool and hanger out of the lubricator;

raising the downhole assembly into the lubricator; and

raising the downhole assembly out of the lubricator.

3. The method of claim 2 , wherein the downhole assembly is raised by:

engaging an upper seal of the lubricator with a deployment cable connected to the running tool;

engaging a lower seal of the lubricator with a power cable of the pumping system;

disengaging the upper seal from the deployment cable;

engaging the upper seal with the power cable;

disengaging the lower seal from the power cable;

closing a valve of the lubricator; and

disengaging the upper seal from the power cable.

4. The method of claim 1 , wherein the downhole assembly further comprises a power conversion module (PCM) operable to receive a DC power signal from a power cable.

5. The method of claim 1 , wherein the high speed motor is a switched reluctance or brushless DC motor.

6. The method of claim 1 , wherein:

the production tree is located at a floor of the sea and the method is performed riserlessly, and

the pumping system further comprises a hanger and a power cable connecting the hanger to the downhole assembly

the downhole assembly is raised or lowered by engaging a running tool with the hanger.

7. The method of claim 6 , further comprising:

washing the downhole assembly while in the lubricator using a washing fluid; and

discharging the spent washing fluid into the wellbore.

8. The method of claim 6 , wherein the hanger is connected to an internal electrical system of the tree.

9. The method of claim 6 , wherein the method is performed while maintaining a double barrier between the wellbore and the sea.

10. The method of claim 1 , further comprising:

servicing or replacing the pumping system;

installing the serviced/replacement pumping system into the wellbore and tree using the lubricator; and

producing hydrocarbon fluid from the wellbore using the serviced/replacement pumping system.

11. The method of claim 1 , wherein:

the diffuser has one or more vanes located at a throat of the Venturi, and

the diffuser vanes are operable to negate swirl imparted by the helicoidal vanes.

12. A method of installing or retrieving a pumping system into or from a live wellbore, comprising:

connecting a lubricator to a production tree of the live wellbore; and

raising or lowering a downhole assembly of the pumping system from or into the wellbore using the lubricator,

wherein:

the downhole assembly comprises: a high speed motor, an isolation device operable to engage production tubing disposed in the wellbore, and a high speed pump, and

the high speed pump comprises one or more stages, each stage comprising:

a tubular housing;

a mandrel disposed in the housing and comprising:

a rotor rotatable relative to the housing and having:

an impeller portion,

a shaft portion, and

one or more helicoidal vanes extending along the impeller portion,

a diffuser:

connected to the housing,

having the shaft portion extending therethrough, and

having one or more vanes operable to negate swirl imparted to fluid pumped through the impeller portion; and

a fluid passage formed between the housing and the mandrel and having a nozzle section, a throat section, and a diffuser section.