Method for determining tracer concentration in oil and gas production fluids
First Claim
Patent Images
1. A method for determining the extent of recovery of materials injected or otherwise introduced into an oil well comprising:
- a) admixing a material to be injected or otherwise introduced into an oil well with at least one chemical tracer compound at a predetermined concentration;
b) injecting or otherwise introducing the admixture into an oil well or an offset well associated with an oil well;
c) recovering from the oil well a production fluid; and
d) prescreening the production fluid for the presence of at least one tracer using a portable device;
wherein the portable device is selected from the group consisting of a lateral flow device;
an impregnated agar device;
a dipstick device and a test strip device.
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Accused Products
Abstract
A method for determining the extent of recovery of materials injected or otherwise introduced into oil wells or subsurface formations is practiced using a portable device. The portable device can also be used to determiner the occurrence of a predetermined condition in an oil well such as water break through in a production zone, or the opening or closing of a sliding sleeve. When, for example, water breakthrough is detected, the zone producing too much water can be plugged, using, for example, a flow-through bridge plug, if there are other producing zones further downhole.
91 Citations
26 Claims
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1. A method for determining the extent of recovery of materials injected or otherwise introduced into an oil well comprising:
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a) admixing a material to be injected or otherwise introduced into an oil well with at least one chemical tracer compound at a predetermined concentration; b) injecting or otherwise introducing the admixture into an oil well or an offset well associated with an oil well; c) recovering from the oil well a production fluid; and d) prescreening the production fluid for the presence of at least one tracer using a portable device; wherein the portable device is selected from the group consisting of a lateral flow device; an impregnated agar device;
a dipstick device and a test strip device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 26)
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12. A method for determining the extent of recovery of a material of interest injected or otherwise introduced into an oil well or a subsurface formation associated with a bore of the oil well comprising:
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a) introducing a material of interest into the oil well or into the subsurface formation associated with the bore of the oil well; b) introducing at least one tracer into the oil well or into the subsurface formation associated with the bore of the oil well; c) recovering from the oil well a production fluid; d) prescreening the production fluid for the presence of the at least one tracer using a portable device; e) analyzing the production fluid for a concentration of at least one chemical tracer present in the production fluid; and f) calculating the amount of material of interest recovered from the oil well using the concentration of the at least one chemical tracer present in the production fluid as a basis for the calculation; wherein the portable device is selected from the group consisting of a lateral flow device;
an impregnated agar device;
a dipstick device and a test strip device. - View Dependent Claims (13, 14, 15, 16)
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- 17. A method for determining a characteristic of an oil well comprising fixing a tracer downhole and determining the presence or absence of the tracer in production sample using a portable device wherein the tracer is fixed upon a screen, painted onto a section of production tubing, or attached down hole in the form of a pellet or tape.
- 23. A portable device for determining the amount of a tracer in production fluid from an oil well selected from the group consisting of a lateral flow device, a test strip, an agar device or a dip stick device wherein the device comprises a compound that interacts with the tracer to visibly indicate the presence of the tracer.
Specification