Propelling tool

1. A propelling tool for enabling a forward drive for operation in a pipeline, a casing, a well, or any other cavity, comprising:

a supply tubing comprising a pressurised supply fluid,

a housing connected to the supply tubing, having:

a supply inlet provided in a rear end of the housing for supplying pressurised supply fluid from the supply tubing,

a supply outlet provided in the rear end of the housing for ejection of the supply fluid,

a suction inlet provided in a front end of the housing for an intake of cavity fluid surrounding the tool into the housing, and

a suction outlet provided in the rear end of the housing for an outlet of cavity fluid, and

a pump for suction of cavity fluid in through the suction inlet and out through the suction outlet, the pump being driven by the pressurised supply fluid for pulling the tool forward in a cavity.

2. A propelling tool according to claim 1 , wherein the housing has a seal to abut against the cavity.

3. A propelling tool according to claim 1 , wherein a turbine is positioned between the supply inlet and the pump, is connected with the pump via a shaft, and is driven by the pressurised fluid for driving the pump.

4. A releasing system for releasing precipitated solids, in a cavity fluid in a pipeline, a casing, a well, or any other cavity, comprising:

a propelling tool according to claim 1 , and

a release device to release the precipitated solids from the cavity.

5. A releasing system according to claim 4 , wherein the release device is a turbine of the propelling tool having at least one ejection outlet for a direct ejection of supply fluid into the cavity bypassing the pump in order to release the precipitated solids from the cavity.

6. A releasing system according to claim 4 , wherein the release device is at least one bypassing channel fluidly connected to the supply inlet for a direction of part of the supply fluid out through at least one ejection outlet directly ejecting the supply fluid into the cavity bypassing the pump in order to release the precipitated solids from the cavity.

7. A releasing system according to claim 4 , wherein the release device is a bypass device in connection with a turbine enabling a bypassing of the turbine for ejecting the pressurised fluid directly into the cavity through the ejection outlet.

8. A releasing system according to claim 4 , wherein the supply fluid is water mixed with any kind of alcohol or other kind of solvent before being ejected through the ejection outlet.

9. A releasing system according to claim 4 , wherein the release device is a releasing tool provided on the shaft in front of the propelling tool when moving forward in the cavity, and wherein the releasing tool has at least one cutting edge, scraper, knife, share, or drill bit.

10. A releasing system according to claim 4 , wherein the release device is a fastener provided on the shaft for fastening to a pipeline pig and releasing the pipeline pig and bringing it to above surface.

11. A releasing system according to claim 10 , wherein the fastener has at least one retractable barb able to retract into the shaft and to expand when the fastening device needs to enter a through-going hole in the pipeline pig.