US5318128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for cleaning wellbore perforations
Assignee: Baker Hughes Holdings LLC
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Filing: 1992-12-09
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Granted: 1994-06-07
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Expires: 2012-12-09
Abstract
Abstract An apparatus and method are disclosed for removing debris from a recently perforated formation. A vacuum source, such as a subsurface jet pump is employed, coupled with a sealing arrangement to isolate a portion of the recently perforated formation. The vacuum device increases the velocity of the formation fluids to enable them to entrain the debris and bring it to the surface.
Inventors
- 👤 Michael H. Johnson
- 👤 Bennett M. Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:34
CPC Classifications
E; E21; E21B; E21B37/00; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B37/08; E21B43/00; E21B43/12; E21B43/121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A method for removing debris after a formation is perforated in a wellbore comprising: isolating at least one portion of the formation in the wellbore with a tool; accomplishing said isolating step with a plurality of cup seals; applying a vacuum to the portion of the wellbore that is isolated; accomplishing said vacuum with a jet pump; allowing formation fluids to flow through the tool to the surface; increasing the velocity of the formation fluids in the isolated portion of the wellbore by virtue of said applied vacuum; entraining the debris in said isolated portion of the wellbore due at least in part to said velocity increase; removing the fluid and entrained debris from the wellbore; and back washing a screen to remove accumulated debris.
Claim 2
Independent Claim
125 words
A method for removing debris after a formation is perforated in a wellbore comprising: isolating at least one portion of the formation in the wellbore with a tool; accomplishing said isolating step with a plurality of cup seals; applying a vacuum to the portion of the wellbore that is isolated; accomplishing said vacuum with a jet pump; allowing formation fluids to flow through the tool to the surface; increasing the velocity of the formation fluids in the isolated portion of the wellbore by virtue of said applied vacuum; entraining the debris in said isolated portion of the wellbore due at least in part to said velocity increase; removing the fluid and entrained debris from the wellbore; and back washing a screen to remove accumulated debris.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |