Patent US4782899A successfully refreshed from Google Patents.
US4782899A
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Measuring oil saturation with gaseous oil tracers
Assignee: Shell USA Inc
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Filing: 1986-10-15
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Granted: 1988-11-08
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Expires: 2006-10-15
Abstract
Abstract The oil saturation within a subterranean reservoir is determined by injecting water containing dissolved reactants which are substantially oil-insoluble and which convert the injected solution into a tracer-containing solution in which there is at least one each of oil and water tracers, with the oil tracers being gaseous, and chromatographically analyzing the patterns of the concentrations of the tracers within fluid produced from the reservoir for determining the oil saturation.
Inventors
- 👤 Edwin A. Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:05
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/11; E21B49/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
179 words
In a process in which a solution containing oil and water tracers is formed within a subterranean reservoir formation for determining the saturation of oil phase fluid within that formation by measuring the extent to which the tracers are chromatographically separated when the tracer-containing solution is flowed within the formation, the improvement comprising: injecting into the reservoir an aqueous solution containing solutes which are substantially compeltely insoluble in reservoir oil; including among said solutes (a) compounds which react within the reservoir to form at least one gaseous oil tracer which partitions between oil and water phases of fluid in the reservoir and is substantially unreactive with oil, and (b) at least one compound which is, or becomes, a water soluble water tracer which is substantially completely immiscible in oil phase fluid within the reservoir; and flowing the injected aqueous solution into a selected location within the reservoir in which the saturation of oil phase fluid is to be measured and allowing said tracer forming reaction to occur in that location to form the solution containing oil and water tracers.
Claim 2
Dependent Claim
179 words
In a process in which a solution containing oil and water tracers is formed within a subterranean reservoir formation for determining the saturation of oil phase fluid within that formation by measuring the extent to which the tracers are chromatographically separated when the tracer-containing solution is flowed within the formation, the improvement comprising: injecting into the reservoir an aqueous solution containing solutes which are substantially compeltely insoluble in reservoir oil; including among said solutes (a) compounds which react within the reservoir to form at least one gaseous oil tracer which partitions between oil and water phases of fluid in the reservoir and is substantially unreactive with oil, and (b) at least one compound which is, or becomes, a water soluble water tracer which is substantially completely immiscible in oil phase fluid within the reservoir; and flowing the injected aqueous solution into a selected location within the reservoir in which the saturation of oil phase fluid is to be measured and allowing said tracer forming reaction to occur in that location to form the solution containing oil and water tracers.
Claim 3
Dependent Claim
121 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the aqueous solution but react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir and a water tracer that remains substantially dissolved in the water phase within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the oil and water tracers; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 4
Dependent Claim
121 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the aqueous solution but react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir and a water tracer that remains substantially dissolved in the water phase within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the oil and water tracers; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 5
Dependent Claim
18 words
The process of claim 2 wherein a water tracer is injected into the reservoir with the injected solution.
Claim 6
Dependent Claim
112 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 7
Dependent Claim
112 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 8
Dependent Claim
15 words
The process of claim 2 or 4 wherein the gaseous oil tracer is carbon dioxide.
Claim 9
Dependent Claim
15 words
The process of claim 2 or 4 wherein the gaseous oil tracer is nitric oxide.
Claim 10
Dependent Claim
14 words
The process of claim 2 or 4 wherein the gaseous oil tracer is ammonia.
Claim 11
Dependent Claim
14 words
The process of claim 2 or 4 wherein the gaseous oil tracer is hydrogen.
Claim 12
Dependent Claim
14 words
The process of claim 2 or 4 wherein the gaseous oil tracer is oxygen.
Claim 13
Dependent Claim
14 words
The process of claim 2 or 4 wherein the gaseous oil tracer is nitrogen.
Claim 14
Dependent Claim
15 words
The process of claim 2 or 4 wherein the gaseous oil tracer is sulfur dioxide.
Claim 15
Dependent Claim
125 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the aqueous solution but engage in an oxidation-reduction reaction within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir and a water tracer that remains substantially dissolved in the water phase within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the oil and water tracers; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 16
Dependent Claim
125 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the aqueous solution but engage in an oxidation-reduction reaction within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir and a water tracer that remains substantially dissolved in the water phase within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the oil and water tracers; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 17
Dependent Claim
18 words
The process of claim 12 wherein a water tracer is injected into the reservoir with the injected solution.
Claim 18
Dependent Claim
116 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes engage in an oxidation-reduction reaction within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 19
Dependent Claim
116 words
A process for determining oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes engage in an oxidation-reduction reaction within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; and determining the oil saturation within the reservoir using the produced fluid and chromatographic principles.
Claim 20
Dependent Claim
15 words
The process of claim 12 or 14 wherein the gaseous oil tracer is nitric oxide.
Claim 21
Dependent Claim
14 words
The process of claim 12 or 14 wherein the gaseous oil tracer is ammonia.
Claim 22
Dependent Claim
14 words
The process of claim 12 or 14 wherein the gaseous oil tracer is hydrogen.
Claim 23
Dependent Claim
14 words
The process of claim 12 or 14 wherein the gaseous oil tracer is oxygen.
Claim 24
Dependent Claim
14 words
The process of claim 12 or 14 wherein the gaseous oil tracer is nitrogen.
Claim 25
Dependent Claim
15 words
The process of claim 12 or 14 wherein the gaseous oil tracer is sulfur dioxide.
Claim 26
Dependent Claim
151 words
A process for determining the concentration of oil phase fluid within a subterranean reservoir, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the injected solution but react within the reservoir to convert the injected solution into a tracer-containing solution which contains a water tracer that remains substantially dissolved in water phase fluid in the reservoir and an oil tracer which is gaseous, is unreactive with oil, and partitions between oil phase and water phase fluids within the reservoir; displacing the aqueous solution within the reservoir; allowing the aqueous solution to convert to its corresponding tracer-containing solution; producing fluid containing the tracers from the reservoir; within the produced fluid, measuring the extent of any chromatographically induced separation between arrivals of said tracers; and determining the concentration of oil phase fluid within the reservoir that corresponds to the measured extent of separation between the tracers.
Claim 27
Dependent Claim
151 words
A process for determining the concentration of oil phase fluid within a subterranean reservoir, comprising: injecting into the reservoir an aqueous solution containing solutes which remain substantially completely dissolved in the injected solution but react within the reservoir to convert the injected solution into a tracer-containing solution which contains a water tracer that remains substantially dissolved in water phase fluid in the reservoir and an oil tracer which is gaseous, is unreactive with oil, and partitions between oil phase and water phase fluids within the reservoir; displacing the aqueous solution within the reservoir; allowing the aqueous solution to convert to its corresponding tracer-containing solution; producing fluid containing the tracers from the reservoir; within the produced fluid, measuring the extent of any chromatographically induced separation between arrivals of said tracers; and determining the concentration of oil phase fluid within the reservoir that corresponds to the measured extent of separation between the tracers.
Claim 28
Dependent Claim
18 words
The process of claim 21 wherein a water tracer is injected into the reservoir with the injected solution.
Claim 29
Dependent Claim
154 words
A process for determining residual oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; analyzing the produced fluid to determine the concentrations of the oil and water tracers therein; determining the chromatographic separation between the oil and water tracers using the concentrations of oil and water tracers in the produced fluid; and determining the residual oil saturation within the reservoir using the chromatographic separation of the oil and water tracers.
Claim 30
Dependent Claim
154 words
A process for determining residual oil saturation within a reservoir, penetrated by at least one well, comprising: injecting into the reservoir an aqueous solution containing solutes and a water tracer which remain substantially completely dissolved in the aqueous solution but wherein the solutes react within the reservoir to form a gaseous oil tracer which is unreactive with oil and partitions between oil and water phases within the reservoir; displacing the aqueous solution within the reservoir; allowing the solutes in the aqueous solution to react and form the gaseous oil tracer; producing fluid containing the tracers from the reservoir; analyzing the produced fluid to determine the concentrations of the oil and water tracers therein; determining the chromatographic separation between the oil and water tracers using the concentrations of oil and water tracers in the produced fluid; and determining the residual oil saturation within the reservoir using the chromatographic separation of the oil and water tracers.
References Cited (Backward Citations)
CA594807A
Cited
US3532165A
Cited
US3623842A
Cited
US3751226A
Cited
US3801281A
Cited
US3856468A
Cited
US3847548A
Cited
US3993131A
Cited
US3990298A
Cited
US4099565A
Cited
US4122896A
Cited
US4168746A
Cited
US4646832A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
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