Downhole sampling tool and method for using same
First Claim
1. A downhole sampling tool, comprising:
- a shaft extendable from a housing into a perforation penetrating a subterranean formation;
a flowline extending within the shaft and the housing, the flowline having an inlet for receiving downhole fluid from the perforation; and
a fluid restrictor comprising a fluid injected into the formation and creating a seal about at least a portion of the perforation.
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Accused Products
Abstract
Methods and apparatuses for sampling fluid from a subterranean formation penetrated by a wellbore are provided. The subterranean formation has clean formation fluid therein, and the wellbore has a contaminated fluid therein extending into an invaded zone about the wellbore. A shaft is extended from a housing and positioned in a perforation in a sidewall of the wellbore. At least one flowline extends through the shaft and into the housing. The flowline(s) are adapted to receive downhole fluids through the perforation. At least one fluid restrictor, such as a packer, injection fluid or flow inhibitor, may be used to isolate at least a portion of the perforation whereby contaminated fluid is prevented from entering the isolated portion of the perforation. At least one pump selectively draws fluid into the flowline(s).
50 Citations
20 Claims
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1. A downhole sampling tool, comprising:
a shaft extendable from a housing into a perforation penetrating a subterranean formation; a flowline extending within the shaft and the housing, the flowline having an inlet for receiving downhole fluid from the perforation; and a fluid restrictor comprising a fluid injected into the formation and creating a seal about at least a portion of the perforation. - View Dependent Claims (2, 3, 4)
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5. A method of sampling formation fluid from a subterranean formation, comprising:
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creating a perforation penetrating the formation beyond an invaded zone about a wellbore penetrating the formation; extending a shaft into the perforation; isolating the perforation from wellbore fluids by injecting another fluid into the formation about the perforation; and drawing formation fluid from the isolated perforation via the shaft. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A downhole sampling tool, comprising:
a shaft extendable from a housing into a perforation penetrating a subterranean formation; a flowline extending within the shaft and the housing, the flowline having an inlet for receiving downhole fluid from the perforation; and a fluid restrictor comprising a viscous fluid injected in a portion of the wellbore about the perforation. - View Dependent Claims (13, 14, 15)
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16. A method of sampling formation fluid from a subterranean formation, comprising:
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creating a perforation penetrating the formation beyond an invaded zone about a wellbore penetrating the formation; extending a shaft into the perforation; isolating the perforation from wellbore fluids by injecting a viscous fluid in the wellbore about the perforation; and drawing formation fluid from the isolated perforation via the shaft. - View Dependent Claims (17, 18, 19, 20)
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Specification