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US 2015/0308232 A1Published application
Downhole cleaning system
AssigneeWelltec A/S
InventorJorgen HALLUNDBAEK
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AssigneeWelltec A/S
InventorJorgen HALLUNDBAEK
Estimating the term…
The present invention relates to a downhole cleaning system for cleaning an element inside a casing in a wellbore comprising well fluid having a wellbore pressure, comprising the casing, a cleaning tool having a longitudinal direction and comprising a rotatable nozzle head having a plurality of nozzles, a tool housing having an inlet being in fluid communication with the nozzles for jetting well fluid into the tool, a flow hindering element arranged on an outside of the housing dividing the tool in a first and a second tool part and dividing the casing in a first and a second casing part and a rotatable shaft connecting the nozzle head with the housing, wherein the system further comprises a pumping device for pressurising the well fluid in the first part of the casing to a pressure substantially above the wellbore pressure and above a pressure in the second part of the casing so that well fluid is pumped in through the inlet and out through the nozzles. Furthermore, the invention relates to a wireline cleaning tool and to a cleaning method.
-28. (canceled)
A wireline cleaning tool (10) arranged in a casing downhole and having a longitudinal direction (11), comprising:
A downhole cleaning system according to 33, wherein the flow hindering element is a packer, an inflatable unit, a rubber element or an elastomeric element.
A downhole cleaning system according to 33, further comprising a measuring device (38) measuring a rotational speed of the nozzle head.
A downhole cleaning system according to 33, wherein the nozzle head comprises a check valve (40).
A cleaning method comprising the steps of:
Dependencies are inferred from the claim text.