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.
Inventors
👤 Michael E. Krugh
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-08 20:04
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02; E21B27/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
260 words
A process for removing debris from a cased well bore hole containing a fluid in a substantially static environment comprising the steps of: continuously lowering a tubular tool into the well bore hole during a collection mode to create relative circulation of the fluid through the tubular tool while; scraping the debris from the casing of the well bore hole into the fluid by a scraping means affixed to the lower end of the tubular tool; feeding the debris-containing fluid to the interior of the tubular tool via an opening in the lower end of the tool; filtering the debris-containing fluid upward across a first filtering means cross-sectionally positioned within the tubular tool; collecting the debris filtered from the fluid in a collection means positioned below the first filtering means in the tubular tool; opening a valve, which permits upward flow of filtered fluid through the valve but not reverse downward flow of fluid through the valve and which is positioned cross-sectionally in the tubular tool above the first filtering means and below a port in the upper end of the tool; expelling the filtered fluid from the interior of the tubular tool via the port which provides fluid communication between the interior of the tool and the well bore hole; and thereafter continuously raising the tubular tool in the wall bore hole during a retrieval mode while; closing the valve to substantially prevent downward flow of fluid across the filtering means; and removing the debris contained in the collection means of the tubular tool from the well bore hole.
Claim 2
Dependent Claim
260 words
A process for removing debris from a cased well bore hole containing a fluid in a substantially static environment comprising the steps of: continuously lowering a tubular tool into the well bore hole during a collection mode to create relative circulation of the fluid through the tubular tool while; scraping the debris from the casing of the well bore hole into the fluid by a scraping means affixed to the lower end of the tubular tool; feeding the debris-containing fluid to the interior of the tubular tool via an opening in the lower end of the tool; filtering the debris-containing fluid upward across a first filtering means cross-sectionally positioned within the tubular tool; collecting the debris filtered from the fluid in a collection means positioned below the first filtering means in the tubular tool; opening a valve, which permits upward flow of filtered fluid through the valve but not reverse downward flow of fluid through the valve and which is positioned cross-sectionally in the tubular tool above the first filtering means and below a port in the upper end of the tool; expelling the filtered fluid from the interior of the tubular tool via the port which provides fluid communication between the interior of the tool and the well bore hole; and thereafter continuously raising the tubular tool in the wall bore hole during a retrieval mode while; closing the valve to substantially prevent downward flow of fluid across the filtering means; and removing the debris contained in the collection means of the tubular tool from the well bore hole.
Claim 3
Dependent Claim
64 words
The process of claim 1 further comprising during the collection mode after filtering the debris-containing fluid across the first filtering means and collecting the debris therefrom, the steps of filtering the debris-containing fluid across a second filtering means, which is positioned above the first filtering means and below the valve and collecting smaller debris not filtered from the fluid across the first filtering means.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein the filtered fluid is expelled from the interior of the tubular tool via a plurality of ports positioned in the upper end of the tubular tool.
Claim 5
Dependent Claim
37 words
The process of claim 1 further comprising the step of substantially closing the opening in the lower end of the tool to substantially prevent debris in the tool from reentering the well bore during the retrieval mode.