Internal casing wiper for an oil field well bore hole

An improved internal casing wiper tool connected to a drill string (20) for wiping the casing sides (40) of a well bore hole (30) to remove debris (60) contained thereon, said bore hole (30) having fluid (50) with debris (60) contained therein, said tool being capable of collecting larger sized pieces (430) of debris in a first chamber (210) and collecting smaller sized pieces (440) of debris in a second collection chamber (300) as said drill string (20) is lowered into said well bore hole, said improved tool comprising:

• means (330) for connection to the lower end (350) of said drill string (20), said connecting means having a formed internal fluid passageway (410) therein and further comprising:
• (a) means (360) inserted in said passageway (410) and connected to said lower end (350) of said drill string (20) for preventing said fluid (50) from entering said drill string (20), and
• (b) means (380) around the mid-section (370) of said crossover joint (330) for allowing fluid (50) to flow out from said passageway (410),
• means (320) contacting said connecting means located in said passageway (410) below said allowing means (380) for permitting the flow of fluid upwardly through said passageway (410) into said allowing means (380), said permitting means (320) being capable of preventing the flow of said fluid (50) downwardly in said passageway (410),
• an elongated pipe (100) having its upper end (310) connected to the second end (390) of said connecting means (330) for extending said fluid passageway (410),
• means (130) disposed around the outer periphery of said pipe (100) for supporting said pipe substantially in the center of said bore hole (30),
• means (110) connected to the lower end (1020 of said pipe (100) for abutting and wiping said casing sides (30) to dislodge said debris (60),
• a first filter (160) located a first predetermined distance (150) from said lower end (102) of said pipe (100) for collecting said larger pieces (430) of debris (60) in a first chamber (210) located in said pipe (100) between said first filter (160) and said wiping means (110), and
• a second filter (230) located a second predetermined distance (220) from said lower end (102) of said pipe (100) for collecting said smaller pieces (440) of debris (60) in a second chamber (300) located in said pipe (100) between said first filter (160) and said second filter (230) so that as said tool is lowered in said well bore hole (30) said fluid (50) is entrained upwardly into said passageway (410) through said first filter (160), through said second filter (230), through said permitting means (320) and out said allowing means (380) and back into said well bore hole (30), said larger pieces (430) of debris (60) in said fluid (50) being collected in said first chamber (210) and said smaller pieces (440) of debris (60) being collected in said second chamber (300).

An improved internal casing wiper tool connected to a drill string (20) for wiping the casing sides (40) of a well bore hole (30) to remove debris (60) contained thereon, said bore hole (30) having fluid (50) with debris (60) contained therein, said tool being capable of collecting larger sized pieces (430) of debris in a first chamber (210) and collecting smaller sized pieces (440) of debris in a second collection chamber (300) as said drill string (20) is lowered into said well bore hole, said improved tool comprising:

• a crossover joint (330) having one end (340) connected to the lower end (350) of the drill string (20) and having a formed internal fluid passageway (410), said crossover joint comprising:
• (a) a drill pipe float (360) inserted in said passageway (410) and contacting said lower end (350) for preventing said fluid (50) from entering said drill string (20), and
• (b) a plurality of formed ports (380) around the mid-section (370) of said crossover joint (330) to allow fluid (50) to flow out from said passageway (410),
• a check valve (320) contacting said crossover joint located in said passageway (410) below said plurality of formed ports (380) for permitting the flow of fluid upwardly through said passageway (410) into said ports (380), said check valve (320) being capable of preventing the flow of said fluid (50) downwardly in said passageway (410),
• an elongated pipe (100) having its upper end (310) connected to the second end (390) of said crossover joint (330) for extending said fluid passageway (410),
• a petal basket (110) connected to the lower end (102) of said pipe (100) having a plurality of outwardly extending petals (120) around its periphery, said petals (120) under pressure of said fluid (50) being capable of abutting and wiping said casing sides (30) to dislodge said debris (60),
• a first filter (160) located a first predetermined distance (150) from said lower end (102) of said pipe (100) for collecting said larger pieces (430) of debris (60) in a first chamber (210) located in said pipe (100) between said first filter (160) and said petal basket (110), and
• a second filter (230) located a second predetermined distance (220) from said lower end (102) of said pipe (100) for collecting said smaller pieces (440) of debris (60) in a second chamber (300) located in said pipe (100) between said first filter (160) and said second filter (230) so that as said tool is lowered in said well bore hole (30) said fluid (50) is entrained upwardly into said passageway (410) through said first filter (160), through said second filter (230), through said check valve (320) and out said ports (380) and back into side well bore hole (30), said larger pieces (430) of debris (60) in said fluid (50) being collected in said first chamber (210) and said smaller pieces (440) of debris (60) being collected in said second chamber (300).