Downhole sampling
First Claim
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1. A reservoir sampling apparatus for sampling a fluid from a formation, comprising:
- a sample chamber;
a guarded probe comprising a sample probe and a guard probe, wherein the sample probe is configured in use to be contacted with the formation and provide a fluid flow path between the formation and the sample chamber;
a heating projector configured to project heat into the formation surrounding the guarded probe;
a viscometer configured to measure a viscosity of a fluid sample flowing through the sample probe; and
a controller configured to control the heat projector to maintain the temperature of the fluid in the formation below a threshold value, wherein the threshold value is determined using the measured viscosity.
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Abstract
A reservoir sampling apparatus comprising at least one probe adapted to provide a fluid flow path between a formation and the inner of the apparatus with a heating projector adapted to project heat into the formation surrounding the probe and a controller to maintain the temperature in the formation below a threshold value.
47 Citations
17 Claims
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1. A reservoir sampling apparatus for sampling a fluid from a formation, comprising:
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a sample chamber; a guarded probe comprising a sample probe and a guard probe, wherein the sample probe is configured in use to be contacted with the formation and provide a fluid flow path between the formation and the sample chamber; a heating projector configured to project heat into the formation surrounding the guarded probe; a viscometer configured to measure a viscosity of a fluid sample flowing through the sample probe; and a controller configured to control the heat projector to maintain the temperature of the fluid in the formation below a threshold value, wherein the threshold value is determined using the measured viscosity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of sampling formation fluid from a downhole location, comprising:
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lowering a sampling tool into a wellbore, the sampling tool comprising a sample chamber and a guarded probe; contacting the guarded probe with the formation; using a heat projector to increase the formation temperature in the vicinity of the guarded probe to reduce the viscosity of the formation fluid; measuring a viscosity of the formation fluid flowing through the guarded probe; and using the measured viscosity to control the heat projector to prevent changes in the composition of the formation fluid. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification