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US 7,028,769 B2Granted
Well bore cleaning and tubular circulating and flow-back apparatus
OwnerAlbert Augustus Mullinsinventor
Life of this patent
Estimating the term…
Abstract
Several well bore clean-out apparatus' are disclosed that provides a method of cleaning a well bore while the apparatus' are being deployed into a well forcing well bore fluid into a work string and for moving solids to the surface. A method of cleaning multiple diameters of well casings is also disclosed. A method of circulating or reverse circulating the well at anytime during the deployment of the apparatus' is disclosed.
Claims17
A wellbore cleaning apparatus, comprising:
- a mandrel having a lower end extending beyond at least one lowermost fluid barrier, said lowermost fluid barrier extending toward the wellbore wall;
- at least one first lateral opening through said mandrel, located between said lower end of said mandrel and said lowermost fluid barrier and substantially closer to said lowermost fluid barrier than to said lower end, said first lateral opening in fluid communication with an inner passage through said mandrel to accept fluid and debris as said mandrel is advanced downhole;
- said inner passage extends through to said downhole end of said mandrel and is selectively closed;
- said inner passage is selectively closed by a removable plug located between said lower end of said mandrel and first lateral opening;
- said mandrel comprising a second passage extending from above to below said fluid barrier and selectively closed when said mandrel is advanced into the wellbore.
2 more elements
A wellbore cleaning apparatus, comprising:
- a mandrel having a lower end extending beyond at least one lowermost fluid barrier, said lowermost fluid barrier extending toward the wellbore wall;
- at least one first lateral opening through said mandrel, located between said lower end of said mandrel and said lowermost fluid barrier and substantially closer to said lowermost fluid barrier than to said lower end, said first lateral opening in fluid communication with an inner passage through said mandrel to accept fluid and debris as said mandrel is advanced downhole;
- said inner passage extends through to said downhole end of said mandrel and is selectively closed;
- said inner passage is selectively closed by a removable plug located between said lower end of said mandrel and first lateral opening;
- said lowermost fluid barrier comprises at least two barriers of different diameters disposed in at least two portions of the wellbore that have corresponding diameters to said barriers, said mandrel comprising a first lateral opening adjacent each barrier communicating with said through inner passage and said plug located between said lower end and said first lateral opening adjacent the smaller of said fluid barriers.
2 more elements
A wellbore cleaning apparatus, comprising:
- a mandrel having a lower end extending beyond at least one lowermost fluid barrier, said lowermost fluid barrier extending toward the wellbore wall;
- at least one first lateral opening through said mandrel, located between said lower end of said mandrel and said lowermost fluid barrier and substantially closer to said lowermost fluid barrier than to said lower end, said first lateral opening in fluid communication with an inner passage through said mandrel to accept fluid and debris as said mandrel is advanced downhole;
- said inner passage extends through to said downhole end of said mandrel and is selectively closed;
- said inner passage is selectively closed by a removable plug located between said lower end of said mandrel and first lateral opening;
- said first lateral opening is selectively closed while a bypass passage from above to below said fluid barrier is opened to allow fluid to be forced from above to below said fluid barrier to flow outside said mandrel to said lower end thereof for return through said lower end of said passage with said plug removed.
2 more elements
Dependencies are inferred from the claim text.