Wells – Processes – Cleaning or unloading well
Patent
1987-07-22
1988-05-17
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166106, 166105, 175 67, E21B 3700
Patent
active
047444207
ABSTRACT:
Sand is evacuated from horizontal and vertical wellbores utilizing a jet pump connected to the distal end of a concentric tubing string which is insertable in the wellbore and extendable from the earth's surface or from a seal member providing a crossover flow path between the wellbore annulus above the seal member and the inner tubing member of the concentric tubing string. The jet pump includes a plurality of nozzles for ejecting evacuation of fluid into the wellbore to agitate and entrain accumulated solids for flow into a pump inlet cavity and to be propelled out of the pump by a portion of the evacuation fluid acting as a jet pump power fluid. The inner tubing member may be coilable tubing which is inserted into the outer tubing member after the jet pump has been lowered into the wellbore. An upper portion of the concentric tubing string may be made up of preassembled sections of the inner and outer tubing members. One embodiment of the seal member is an inflatable packer utilizing evacuation fluid as the seal element inflation medium.
REFERENCES:
patent: 3007526 (1961-11-01), Tausch
patent: 3020958 (1962-02-01), Kenneday
patent: 3662828 (1972-05-01), Hutchison
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patent: 4183722 (1980-01-01), Roeder
patent: 4293283 (1981-10-01), Roeder
patent: 4603735 (1986-08-01), Black
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patent: 4671359 (1987-06-01), Renfro
Hearn David D.
Patterson John C.
Atlantic Richfield Company
Martin Michael E.
Novosad Stephen J.
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