Wells – Processes – Cleaning or unloading well
Patent
1985-01-22
1986-08-05
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166 99, 166170, E21B 3108, E21B 3103, E21B 3700, E21B 3702
Patent
active
046037390
ABSTRACT:
The invention provides a process for using an internal casing wiper tool 10 to wipe the casing sides 10 of a well bore hole 30 in order to remove debris 60 contained thereon and further to remove debris 60 contained in fluid found in the bore hole 30. The tool includes a first chamber 210 for collecting larger sized pieces 430 of debris 60 and a second chamber 300 for collecting the smaller sized pieces 440 of debris 60 as the tool is lowered into the well bore hole 30. The tool includes an elongated tube 100 having its upper end 310 connected to the lower end 350 of the drilling string 20 internally containing the first 210 and second 300 chambers, a plurality of centralizers 130 are disclosed around the tube 100 for substantially centering the tube 100 in the bore hole, a petal basket 110 is connected to the lower end 102 of the tube having a plurality of outwardly extending petals 120 around its periphery for wiping the casing sides in order to dislodge the debris and to guide the fluid with the debris into the tube 100, a first filter 160 is located at a first predetermined distance 150 from the lower end 102 of the pipe 100 and separates out the larger pieces 430 of debris 60 and a second filter 230 is located above the first filter for separating out the smaller pieces 440 of debris 60, a check valve 320 is located above the second filter 230 and permits the cleaned fluid to flow outwardly from the tool 10 back into the well bore 30.
REFERENCES:
patent: 2617486 (1952-11-01), Davis
patent: 3500933 (1970-03-01), Burba, Jr. et al.
patent: 3730268 (1973-05-01), Burnside
patent: 4059155 (1977-11-01), Greer
patent: 4515212 (1985-05-01), Krugh
Bagnell David J.
Brown Rodney F.
Hummel Jack L.
Marathon Oil Company
Novosad Stephen J.
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