Patent US4428425A successfully refreshed from Google Patents.
US4428425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single pass filtration of oil or gas well completion fluids
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1983-02-18
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Granted: 1984-01-31
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Expires: 2003-02-18
Abstract
Abstract A single pass filtration process for the removal of suspended solids from completion fluids used in oil or gas well drilling operations which utilizes pressure injection of these fluids into a filter having pattern filter plates.
Inventors
- 👤 John A. Young
- 👤 Richard E. Munson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:53
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/34; E21B43/35; B; B01; B01D; B01D25/00; B01D25/12; B01D37/00; B01D37/02; E21B21/00; E21B21/06; E21B21/063; E21B21/065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A single pass filtration process for removing at least about 99% of particulate material of a size in excess of about one micron from subterranean well completion fluids, comprising the steps of: (1) forcing the well completion fluid under pressure through a vertical planar expanse of filter cloth pre-treated with a filter aid, said filter cloth abutting a rigid supporting surface having a multiplicity of channels communicating with a peripheral channel; and (2) removing the filtrate from the peripheral channel.
Claim 2
Dependent Claim
80 words
A single pass filtration process for removing at least about 99% of particulate material of a size in excess of about one micron from subterranean well completion fluids, comprising the steps of: (1) forcing the well completion fluid under pressure through a vertical planar expanse of filter cloth pre-treated with a filter aid, said filter cloth abutting a rigid supporting surface having a multiplicity of channels communicating with a peripheral channel; and (2) removing the filtrate from the peripheral channel.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the well completion fluids are aqueous-based, and comprise CaCl 2 , CaBr 2 or ZnBr 2 .
Claim 4
Dependent Claim
20 words
The process of claim 1 or 2 wherein the filter cloth is pre-treated with a filter aid comprising diatomaceous earth.
Claim 5
Dependent Claim
19 words
The process of claim 1 or 2 wherein the filter cloth is pre-treated with a filter aid comprising perlite.
Claim 6
Independent Claim
121 words
A method for treating and removing at least about 99% of contaminate particulate matter of a size in excess of about one micron from fluid circulated into, through and out of a subterranean well, comprising the steps of: (1) establishing a fluid flow path into, through and out of said well; (2) circulating fluid in said flow path; (3) introducing said circulated fluid under pressure into and through a vessel having a vertical planar expanse of filter cloth pre-treated with a filter aid, said filter cloth abutting a rigid supporting surface having a multiplicity of channels communicating with a peripheral channel; (4) removing the filtrate from the peripheral channel; and (5) circulating into said well the filtrate discharged from said vessel.
Claim 7
Independent Claim
121 words
A method for treating and removing at least about 99% of contaminate particulate matter of a size in excess of about one micron from fluid circulated into, through and out of a subterranean well, comprising the steps of: (1) establishing a fluid flow path into, through and out of said well; (2) circulating fluid in said flow path; (3) introducing said circulated fluid under pressure into and through a vessel having a vertical planar expanse of filter cloth pre-treated with a filter aid, said filter cloth abutting a rigid supporting surface having a multiplicity of channels communicating with a peripheral channel; (4) removing the filtrate from the peripheral channel; and (5) circulating into said well the filtrate discharged from said vessel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |