Apparatus and method for obtaining formation fluid samples
AssigneeBaker Hughes Incorporated
InventorsDavid A. Hejl, Shawn Olsen
Life of this patent
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Abstract
In one aspect, an apparatus for obtaining a fluid from a formation is disclosed that in one embodiment may include a fluid extraction device having a first probe and a second probe independently extendable form a tool body, a first fluid line and an associated first filter in fluid communication with the first probe for receiving the fluid from the formation and a second fluid line and an associated second filter in fluid communication with the second probe for receiving the fluid from the formation, and a first fixed scraper that cleans the first filter when the first probe is retracted from an extended position and a second fixed scraper that cleans the second filter when the second probe is retracted from an extended position.
Claims20
An apparatus for obtaining a fluid from a formation, comprising:
- a fluid extraction device that includes:
- an inner probe and an outer probe extendable from a tool body;
- an inner filter provided in a selected length of the inner probe, wherein fluid from the formation entering the inner probe passes through the inner filter and into a first fluid line;
- an outer filter provided in the outer probe extendable from the tool body with the outer probe, wherein fluid from the formation entering the outer probe passes through the outer filter and into a second fluid line, wherein the inner filter is extendable from the tool body with the inner probe and the outer filter is extendable from the tool body with the outer probe and the outer filter surrounds the inner filter;
- and
- an inner scraper at a fixed location within the tool, wherein retracting the inner probe from an extended position moves the inner filter past the inner scraper to clean the inner filter, and an outer scraper at a fixed location within the tool, wherein retracting the outer probe from an extended position moves the outer filter past the outer scraper to clean the outer filter.
A method of obtaining a fluid from a formation, comprising:
- providing a tool that includes an inner probe and an outer probe independently extendable from a tool body, and an inner filter provided in a selected length of the inner probe, wherein fluid from the formation entering the inner probe passes through the inner filter and into a first fluid line, and an outer filter provided in the outer probe, wherein fluid from the formation entering the outer probe passes through the outer filter and into a second fluid line, wherein the inner filter is extendable from the tool body with the inner probe and the outer filter is extendable from the tool body with the outer probe, an inner scraper at a fixed location within the tool, wherein retracting the inner probe from an extended position moves the inner filter past the inner scraper to clean the inner filter, and an outer scraper at a fixed location within the tool, wherein retracting the outer probe from an extended position moves the outer filter past the outer scraper to clean the outer scraper, wherein the outer filter surrounds the inner filter;
- conveying the tool in a wellbore;
- extending the inner probe and the outer probe to contact an inside wall of the wellbore;
- extracting fluid from the formation via the outer probe and determining when such extracted fluid is substantially free of contamination;
- extracting fluid from the formation via the inner probe after determining the extracted fluid is substantially free of contamination and collecting such fluid in a chamber;
- and
- retracting the inner probe to move the inner filter past the inner scraper to clean the inner filter and retracting the outer probe to move the outer filter past the outer scraper to clean the outer filter.
Dependencies are inferred from the claim text.