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US 10,539,015 B2Granted
Fluid identification via pressure
AssigneeSchlumberger Technology Corporation
InventorAlain Nguyen-Thuyet
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for assessing contamination of formation fluid. A downhole sampling tool is operated to draw fluid from a subterranean formation into a chamber of the downhole sampling tool. The downhole sampling tool is then operated to discharge the fluid from the chamber while monitoring pressure of the fluid and volume of the chamber. Contamination of the discharged fluid is assessed based on the monitored fluid pressure and the monitored chamber volume.
Claims18
A method comprising:
- operating a downhole sampling tool to draw fluid from a subterranean formation into a chamber of the downhole sampling tool;
- operating the downhole sampling tool to discharge the fluid from the chamber while monitoring pressure of the fluid and volume of the chamber;
- and
- assessing contamination of the discharged fluid based on the monitored fluid pressure and the monitored chamber volume,
- further comprising determining a ratio between the monitored fluid pressure and the monitored chamber volume, wherein assessing the contamination of the discharged fluid is based on the determined ratio.
2 more elements
A method comprising:
- operating a downhole sampling tool to draw fluid from a subterranean formation into a chamber of the downhole sampling tool;
- operating the downhole sampling tool to discharge the fluid from the chamber while monitoring pressure of the fluid and volume of the chamber;
- and
- assessing contamination of the discharged fluid based on the monitored fluid pressure and the monitored chamber volume,
- wherein:
- operating the downhole sampling tool to draw fluid from the subterranean formation into the chamber, operating the downhole sampling tool to discharge the fluid from the chamber while monitoring pressure of the fluid and volume of the chamber collectively, and assessing contamination, collectively, constitute a cycle;
- and
- the method comprises performing multiple instances of the cycle.
5 more elements
An apparatus comprising:
- a downhole sampling tool for conveyance within a wellbore extending into a subterranean formation, wherein the downhole sampling tool comprises a chamber having a chamber volume, wherein the downhole sampling tool is operable to adjust the chamber volume, draw fluid from the subterranean formation into the chamber, and discharge the fluid from the chamber into the wellbore, and wherein the downhole sampling tool further comprises:
- a first sensor operable to generate first information related to pressure of the fluid within the chamber;
- and
- a second sensor operable to generate second information indicative of the chamber volume;
- and
- a processing device operable to receive the first and second information generated by the first and second sensors, respectively, and assess contamination of the fluid discharged from the chamber based on the received first and second information
- wherein the processing device is operable to determine a ratio between the first information and the second information, and wherein the determined ratio is indicative of contamination of the fluid discharged from the chamber.
4 more elements
A method comprising:
- conveying a downhole sampling tool within a wellbore extending into a subterranean formation, wherein the downhole sampling tool comprises a pump comprising:
- a cylinder;
- a piston slidably disposed in the cylinder;
- and
- a chamber at least partially defined by at least one external surface of the piston and at least one internal surface of the cylinder such that a volume of the chamber is variable in response to movement of the piston within the cylinder;
- operating the pump to draw fluid from a subterranean formation into the chamber;
- operating the pump to discharge the fluid from the chamber while monitoring pressure of the fluid and volume of the chamber;
- and
- assessing contamination of the discharged fluid based on the monitored fluid pressure and the monitored chamber volume.
6 more elements
Dependencies are inferred from the claim text.