Downhole sampling tool and method for using same
First Claim
1. A downhole sampling tool positionable in a wellbore penetrating a subterranean formation, the subterranean formation having a formation fluid therein, the wellbore having a contaminated fluid therein extending into an invaded zone about the wellbore, comprising:
- a housing;
a shaft extendable from the housing, the shaft positionable in a perforation penetrating the formation beyond the invaded zone about the wellbore;
a flowline extending through the shaft and into the housing, the flowline having an inlet for receiving downhole fluids through the perforation; and
a first fluid restrictor positioned at least in part outside of the perforation, the first fluid restrictor adapted to isolate the perforation from the wellbore fluids;
wherein the first fluid restrictor comprises a fluid injected into the formation about the perforation, the fluid adapted to penetrate the formation and create 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 positionable in a wellbore penetrating a subterranean formation, the subterranean formation having a formation fluid therein, the wellbore having a contaminated fluid therein extending into an invaded zone about the wellbore, comprising:
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a housing; a shaft extendable from the housing, the shaft positionable in a perforation penetrating the formation beyond the invaded zone about the wellbore; a flowline extending through the shaft and into the housing, the flowline having an inlet for receiving downhole fluids through the perforation; and a first fluid restrictor positioned at least in part outside of the perforation, the first fluid restrictor adapted to isolate the perforation from the wellbore fluids; wherein the first fluid restrictor comprises a fluid injected into the formation about the perforation, the fluid adapted to penetrate the formation and create a seal about at least a portion of the perforation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of sampling a fluid from a subterranean formation penetrated by a wellbore, the subterranean formation having a formation fluid therein, the wellbore having a contaminated fluid therein extending into an invaded zone about the wellbore, comprising:
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perforating a sidewall of the formation, the perforation penetrating the formation beyond the invaded zone about the wellbore; inserting a shaft into a perforation in a sidewall of a wellbore, the shaft having a flowline extending through the shaft and into the housing, the flowline having an inlet for receiving downhole fluids through the perforation; positioning a first fluid restrictor at least in part outside of the perforation whereby the perforation is isolated from the wellbore fluids, wherein positioning the first fluid restrictor comprises at least one of; injecting a viscous fluid at least in part in the wellbore about the perforation; and injecting a fluid into the formation about the perforation; and drawing downhole fluid from the perforation into the downhole tool via the flowline. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A downhole sampling tool positionable in a wellbore penetrating a subterranean formation, the subterranean formation having a formation fluid therein, the wellbore having a contaminated fluid therein extending into an invaded zone about the wellbore, comprising:
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a housing; a shaft extendable from the housing, the shaft positionable in a perforation penetrating the formation beyond the invaded zone about the wellbore; a flowline extending through the shaft and into the housing, the flowline having an inlet for receiving downhole fluids through the perforation; and a first fluid restrictor positioned at least in part outside of the perforation, the first fluid restrictor adapted to isolate the perforation from the wellbore fluids; wherein the first fluid restrictor comprises a viscous fluid injected at least in part in a portion the wellbore about the perforation. - View Dependent Claims (17, 18, 19, 20)
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Specification