Claims
1. A downhole pumping assembly (1) for being Introduced in a well (63) Inside a casing (61) and submerged in well fluid, the downhole pumping assembly extending in a longitudinal direction (50) and being adapted for connection with a wireline (60), and the downhole pumping assembly comprising a pump section (2) comprising:
- a tubular pump housing (20) providing a pump chamber (201),
- an inlet (21) provided in the tubular pump housing, the Inlet being in fluid communication with the pump chamber,
- a first valve (22) which is a one-way valve arranged for opening and closing the inlet to allow fluid to flow into the chamber,
- a plunger (23) slidably disposed in the pump chamber,
- a pump rod (26) operably connected to the plunger and extending from the plunger through the tubular pump housing,
- an outlet (27) provided in the tubular pump housing, the outlet being in fluid communication with the pump chamber, and
- a second valve (24) which is a one-way valve arranged for controlling a flow of fluid out of the chamber through the outlet,
wherein the downhole pumping assembly further comprises:
- a linear actuator (40) arranged in association with the tubular pump housing
adapted to drive the pump rod, whereby, when the downhole pumping assembly
is at least partially submerged into the well fluid, well fluid is drawn into the
tubular pump housing through the inlet and expelled through the outlet in the
tubular pump housing, and
wherein the pump section further comprises at least one sealing element (29) for isolating a first part (66) of the casing from a second part (67) of the casing.
2. A downhole pumping assembly (1) according to claim 1, wherein the pump section comprises two sealing elements provided on each side of the outlet.
3. A downhole pumping assembly (1) according to claim 2, wherein the sealing elements are chevron seals.
4. A downhole pumping assembly (1) according to claim 2, wherein the sealing elements are compressible elements so that upon compression, an outer diameter of the sealing elements increases.

5. A downhole pumping assembly (1) according to claim 2, wherein the sealing elements are inflatable or expandable by injection of fluid.
6. A downhole pumping assembly (1) according to claim 2, wherein the sealing elements are cup seals.
7. A downhole pumping assembly (1) according to claim 6, wherein the two sealing elements are a first sealing element (29A) and a second sealing element (29B), and wherein the first sealing element is a different type of sealing element than the second sealing element.
8. A downhole pumping assembly (1) according to any of the preceding
claims, wherein the inlet is provided in an end face (204) or a side wall (205) of
the pump chamber and the outlet is provided in the end face or the side wall of
the pump chamber.
9. A downhole pumping assembly (1) according to any of the claims 1-8, wherein the linear actuator comprises a plurality of piston elements (46) slidably disposed in a plurality of piston housings (47) and operably connected to a stroker shaft connected with the pump rod.
10. A downhole pumping assembly (1) according to any of the claims 1-9, wherein the linear actuator comprises:

- an electric linear motor (51), and
- a stroker shaft (45) driven by the electric linear motor for connection with the pump rod to provide reciprocation of the plunger.

11. A downhole system (100) comprising the downhole pumping assembly (1) according to any of the preceding claims, and the casing (61).
12. A downhole system (100) according to claim 11, wherein the casing comprises an annular barrier (64) which comprises a tubular part (67) mounted as part of the casing and an expandable sleeve (65) surrounding the tubular part with an opening (86) through which fluid enters to expand the sleeve, and wherein the pump section of the downhole pumping assembly is arranged opposite the opening for expanding the sleeve by pressurising fluid in an isolated section.

13. A downhole system (100) according to claim 11 or 12, wherein the casing is connected with a screen (58) arranged outside the casing having an opening (86), and wherein the pump section of the downhole pumping assembly is arranged opposite the Inlet of the screen for removing elements on an outside of the screen by pressurising fluid in the Isolated section.
14. A method for removing elements on an outside of a screen (58) using a downhole pumping assembly according to any of the claims 1-10, comprising the steps of:

- inserting the downhole pumping assembly Into the wellbore,
- positioning the pump section of the downhole pumping assembly so that the sealing elements are positioned on each side of an opening (86) to the screen, thereby sealing off the isolated section (87) of the casing, and
- operating the pump section to pump fluid into the isolated section of the casing, whereby fluid is forced in through the screen via the inlet and out into the wellbore.
15. A method for expanding an annular barrier (64) using a downhole pumping
assembly according to any of the claims 1-10, comprising the steps of:
- inserting the downhole pumping assembly into the wellbore,
- positioning the pump section of the downhole pumping assembly so that the sealing elements are positioned on each side of an opening (86) of the annular barrier, thereby sealing off the isolated section (87) of the casing, and
- operating the pump section to pump fluid into the isolated section of the casing, whereby fluid is forced into the opening and expands an expandable sleeve (65) of the annular barrier.