US4157283A
Expired / Lapsed
US
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Sulfide monitoring system and method
Assignee: Delphian Corp
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Filing: 1977-08-30
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Granted: 1979-06-05
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Expires: 1997-08-30
Abstract
Abstract Methods and apparatus relating to systems for determination of sulfide species and hydrogen sulfide hazard potential of well drilling mud.
Inventors
- 👤 Mark S. Zetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:24
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/005; G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2823; G01N33/2835; G01N33/287; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/186
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
Apparatus for measuring the concentration of hydrosulfide ion in well drilling mud comprising, in combination, hydrogen ion electrode means for providing an output signal having an electrical potential which is a function of hydrogen ion concentration, sulfide ion electrode means for providing an output signal having an electrical potential which is a function of sulfide ion concentration, means for subtracting a signal representative the electrical potential of the hydrogen ion electrode means from a signal representative of the electrical potential of the sulfide ion electrode means in a ratio of hydrogen ion potential to sulfide ion potential of about 1:2 to provide a difference output signal which varies as a function of hydrosulfide ion concentration.
Claim 2
Dependent Claim
115 words
Apparatus for measuring the concentration of hydrosulfide ion in well drilling mud comprising, in combination, hydrogen ion electrode means for providing an output signal having an electrical potential which is a function of hydrogen ion concentration, sulfide ion electrode means for providing an output signal having an electrical potential which is a function of sulfide ion concentration, means for subtracting a signal representative the electrical potential of the hydrogen ion electrode means from a signal representative of the electrical potential of the sulfide ion electrode means in a ratio of hydrogen ion potential to sulfide ion potential of about 1:2 to provide a difference output signal which varies as a function of hydrosulfide ion concentration.
Claim 3
Dependent Claim
18 words
Apparatus in accordance with claim 1 wherein said difference output signal is directly proportional to hydrosulfide ion potential.
Claim 4
Dependent Claim
116 words
In a method for determining hydrosulfide ion (HS - ) concentration of well drilling mud by appropriately subtracting from a temperature dependent signal representing sulfide ion electrochemical potential of said mud, a temperature dependent signal proportionately representing substantially half of the hydrogen ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising, providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 5
Dependent Claim
116 words
In a method for determining hydrosulfide ion (HS - ) concentration of well drilling mud by appropriately subtracting from a temperature dependent signal representing sulfide ion electrochemical potential of said mud, a temperature dependent signal proportionately representing substantially half of the hydrogen ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising, providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 6
Independent Claim
120 words
A method for measuring the concentration of hydrosulfide ion in well drilling mud comprising the steps of measuring hydrogen ion concentration in said mud to provide an output signal having an electrical potential which is a function of hydrogen ion concentration, measuring sulfide ion concentration in said mud to provide an output signal having an electrical potential which is a function of sulfide ion concentration, and subtracting said signal representative the electrical potential of the hydrogen ion concentration from said signal representative of the electrical potential of the sulfide ion concentration in a ratio of hydrogen ion potential to sulfide ion potential of about 1:2 to provide a difference output signal which varies as a function of hydrosulfide ion concentration.
Claim 7
Independent Claim
120 words
A method for measuring the concentration of hydrosulfide ion in well drilling mud comprising the steps of measuring hydrogen ion concentration in said mud to provide an output signal having an electrical potential which is a function of hydrogen ion concentration, measuring sulfide ion concentration in said mud to provide an output signal having an electrical potential which is a function of sulfide ion concentration, and subtracting said signal representative the electrical potential of the hydrogen ion concentration from said signal representative of the electrical potential of the sulfide ion concentration in a ratio of hydrogen ion potential to sulfide ion potential of about 1:2 to provide a difference output signal which varies as a function of hydrosulfide ion concentration.
Claim 8
Dependent Claim
19 words
A method in accordance with claim 4 wherein said difference output signal is directly proportional to hydrosulfide ion potential.
Claim 9
Dependent Claim
119 words
In apparatus for determining hydrosulfide ion (HS - ) concentration of well drilling mud including means for appropriately subtracting from a temperature dependent signal representing sulfide ion electrochemical potential of said mud, a temperature independent signal proportionately representing substantially half of the hydrogen ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising means for providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 10
Dependent Claim
119 words
In apparatus for determining hydrosulfide ion (HS - ) concentration of well drilling mud including means for appropriately subtracting from a temperature dependent signal representing sulfide ion electrochemical potential of said mud, a temperature independent signal proportionately representing substantially half of the hydrogen ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising means for providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 11
Dependent Claim
116 words
In a method of determining hydrosulfide ion (HS - ) concentration of well drilling mud by appropriately subtracting from a temperature dependent signal representing hydrogen ion electrochemical potential of said mud, a temperature dependent signal proportionately representing substantially half of the sulfide ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising, providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 12
Dependent Claim
116 words
In a method of determining hydrosulfide ion (HS - ) concentration of well drilling mud by appropriately subtracting from a temperature dependent signal representing hydrogen ion electrochemical potential of said mud, a temperature dependent signal proportionately representing substantially half of the sulfide ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising, providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 13
Dependent Claim
119 words
In apparatus for determining hydrosulfide ion (HS - ) concentration of well drilling mud including means for appropriately subtracting from a temperature dependent signal representing hydrogen ion electrochemical potential of said mud, a temperature independent signal proportionately representing substantially half of the sulfide ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising means for providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
Claim 14
Dependent Claim
119 words
In apparatus for determining hydrosulfide ion (HS - ) concentration of well drilling mud including means for appropriately subtracting from a temperature dependent signal representing hydrogen ion electrochemical potential of said mud, a temperature independent signal proportionately representing substantially half of the sulfide ion electrochemical potential of said mud to provide a temperature dependent pHS - signal, the improvement comprising means for providing temperature compensation for said temperature dependent pHS - signal by adjusting the gain of said signal about its isopotential point to provide a temperature compensated pHS - signal which is compensated about its isopotential point to provide a temperature independent pHS - signal which does not vary substantially with varying temperature of the mud being measured.
References Cited (Backward Citations)
US3702235A
Cited
US3915831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |