Patent US1712763A successfully refreshed from Google Patents.
US3928211A
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US
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Process for scavenging hydrogen sulfide in aqueous drilling fluids and method of preventing metallic corrosion of subterranean well drilling apparatuses
Assignee: Milchem Inc
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Filing: 1974-12-30
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Granted: 1975-12-23
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Expires: 1994-12-30
Abstract
Abstract This invention relates to a process for scavenging hydrogen sulfide which frequently contaminates aqueous drilling fluids and to a method of preventing metallic corrosion of iron drill pipe and the like by utilizing metal compounds which form insoluble sulfide compositions in aqueous media, said compounds containing metals having an electromotive activity greater than that of iron. Said process consists of introducing said compounds into an aqueous drilling fluid and circulating said fluid in the well bore. The metal compounds may be prepared for subsequent addition to the drilling fluid or may be obtained by in situ reactions of materials and/or drilling fluid constituents. A preferred process utilizes metal compounds selected from the class consisting of zinc carbonate, basic zinc carbonate, and zinc hydroxide. An alternate preferred process utilizes a zinc compound which is reacted with an organic material to provide dispersion of the zinc compound, thus enhancing sulfide scavenging characteristics. The metal compounds utilized in the present invention will not adversely affect vital drilling fluid properties.
Inventors
- 👤 William C Browning
- 👤 Homer F Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/032; C09K8/04; C09K8/14; C09K8/16; C09K8/54; E; E21; E21B; E21B41/00; E21B41/02; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
IN THE PROCESS OF PREVENTING CORROSIONOF METALLIC SUBTERRANEAN WELL DRILLING APPARATUSES EXPOSED TO AN AQUEOUS ALKA-LINE DRILLING FLUID HAVING A PH AT LEAST AS HIGH AS ABOUT 9.0 AND CONTAMINATED BY HYDROGEN SULFIDE, THE STEP OF REMOVING HYDROGEN SULFIDE FROM SAID FLUID WITH A HYDROGEN SULFIDE SCAVENGER CONSISTING ESSENTIALLY OF BASIC ZINC CARBONATE, SAID SCAVENGER BEING ADDED TO SAID DRILLING FLUID IN AN AMOUNT OF AT LEAST ABOUT 1 P.P.B.
Claim 2
Dependent Claim
70 words
IN THE PROCESS OF PREVENTING CORROSIONOF METALLIC SUBTERRANEAN WELL DRILLING APPARATUSES EXPOSED TO AN AQUEOUS ALKA-LINE DRILLING FLUID HAVING A PH AT LEAST AS HIGH AS ABOUT 9.0 AND CONTAMINATED BY HYDROGEN SULFIDE, THE STEP OF REMOVING HYDROGEN SULFIDE FROM SAID FLUID WITH A HYDROGEN SULFIDE SCAVENGER CONSISTING ESSENTIALLY OF BASIC ZINC CARBONATE, SAID SCAVENGER BEING ADDED TO SAID DRILLING FLUID IN AN AMOUNT OF AT LEAST ABOUT 1 P.P.B.
Claim 3
Dependent Claim
84 words
In the process of treating an aqueous alkaline drilling fluid having a pH at least as high as about 9.0 for removal of hydrogen sulfide encountered during the drilling of subterranean wells, the steps of admixing with said drilling fluid a hydrogen sulfide scavenger consisting essentially of basic zinc carbonate to react with said hydrogen sulfide forming a metallic sulfide, and circulating said fluid in well bore, said scavenger being added to said drilling fluid in an amount of at least about 1 p.p.b.
Claim 4
Dependent Claim
84 words
In the process of treating an aqueous alkaline drilling fluid having a pH at least as high as about 9.0 for removal of hydrogen sulfide encountered during the drilling of subterranean wells, the steps of admixing with said drilling fluid a hydrogen sulfide scavenger consisting essentially of basic zinc carbonate to react with said hydrogen sulfide forming a metallic sulfide, and circulating said fluid in well bore, said scavenger being added to said drilling fluid in an amount of at least about 1 p.p.b.
Claim 5
Dependent Claim
182 words
A process of preventing undesirable effects of hydrogen sulfide which has been encountered by an aqueous drilling fluid which is circulated at a pH at least as high as about 9.0 in a subterranean well during the drilling thereof with metallic drilling apparatus, wherein said hydrogen sulfide contaminates said drilling fluid resulting in undesirable property changes in said drilling fluid, and wherein said hydrogen sulfide contaminated drilling fluid is corrosive to said drilling apparatus, said process comprising the steps of: adding to said drilling fluid basic zinc carbonate in an amount of at least about 1 p.p.b whereby said hydrogen sulfide contamination is scavenged and reacted to form insoluble zinc sulfide as a reaction product, and circulating said decontaminated drilling fluid in said well, whereby said addition of said basic zinc carbonate and also the formation of said hydrogen sulfide reaction product do not adversely affect the rheological properties of said drilling fluid, said hydrogen sulfide contamination is scavenged to prevent said hydrogen sulfide from adversely affecting the rheological properties of said drilling fluid, and whereby corrosion of said apparatus is prevented.
Claim 6
Dependent Claim
182 words
A process of preventing undesirable effects of hydrogen sulfide which has been encountered by an aqueous drilling fluid which is circulated at a pH at least as high as about 9.0 in a subterranean well during the drilling thereof with metallic drilling apparatus, wherein said hydrogen sulfide contaminates said drilling fluid resulting in undesirable property changes in said drilling fluid, and wherein said hydrogen sulfide contaminated drilling fluid is corrosive to said drilling apparatus, said process comprising the steps of: adding to said drilling fluid basic zinc carbonate in an amount of at least about 1 p.p.b whereby said hydrogen sulfide contamination is scavenged and reacted to form insoluble zinc sulfide as a reaction product, and circulating said decontaminated drilling fluid in said well, whereby said addition of said basic zinc carbonate and also the formation of said hydrogen sulfide reaction product do not adversely affect the rheological properties of said drilling fluid, said hydrogen sulfide contamination is scavenged to prevent said hydrogen sulfide from adversely affecting the rheological properties of said drilling fluid, and whereby corrosion of said apparatus is prevented.
Claim 7
Dependent Claim
188 words
A process of preventing undesirable effects of hydrogen sulfide upon an aqueous drilling fluid which has been exposed to and has become contaminated with hydrogen sulfide and which is circulated at a pH at least as high as about 9.0 in a subterranean well during the drilling thereof with metallic drilling apparatus, wherein said hydrogen sulfide causes undesirable property changes in said drilling fluid, and wherein said hydrogen sulfide contaminated drilling fluid is corrosive to said drilling apparatus said process comprising the steps of: adding to said contaminated drilling fluid basic zinc carbonate in an amount of at least about 1 p.p.b. whereby said hydrogen sulfide contamination is scavenged and is reacted to form insoluble zinc sulfide as a reaction product, and circulating said decontaminated drilling fluid in said well, whereby said addition of said basic zinc carbonate and also the formation of said hydrogen sulfide reaction product do not adversely affect the rheological propertieS of said drilling fluid, said hydrogen sulfide contamination is scavenged to prevent said hydrogen sulfide from adversely affecting the rheological properties of said drilling fluid and whereby corrosion of said apparatus is prevented.
Claim 8
Dependent Claim
188 words
A process of preventing undesirable effects of hydrogen sulfide upon an aqueous drilling fluid which has been exposed to and has become contaminated with hydrogen sulfide and which is circulated at a pH at least as high as about 9.0 in a subterranean well during the drilling thereof with metallic drilling apparatus, wherein said hydrogen sulfide causes undesirable property changes in said drilling fluid, and wherein said hydrogen sulfide contaminated drilling fluid is corrosive to said drilling apparatus said process comprising the steps of: adding to said contaminated drilling fluid basic zinc carbonate in an amount of at least about 1 p.p.b. whereby said hydrogen sulfide contamination is scavenged and is reacted to form insoluble zinc sulfide as a reaction product, and circulating said decontaminated drilling fluid in said well, whereby said addition of said basic zinc carbonate and also the formation of said hydrogen sulfide reaction product do not adversely affect the rheological propertieS of said drilling fluid, said hydrogen sulfide contamination is scavenged to prevent said hydrogen sulfide from adversely affecting the rheological properties of said drilling fluid and whereby corrosion of said apparatus is prevented.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |