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US 2012/0055242 A1Published application
Downhole sampling
AssigneeSchlumberger Technology Corporation
InventorsGARY JOHN TUSTIN, AHMED HAMMAMI, SHAWN DAVID TAYLOR
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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.
Claims17
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.
3 more elements
A method of sampling formation fluid from a downhole location, comprising:
- 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.
3 more elements
Dependencies are inferred from the claim text.