Formation Evaluation While Drilling
First Claim
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1. A sample module for a sampling while drilling tool positionable in a wellbore penetrating a subterranean formation, comprising:
- a sample chamber having an inlet;
a sample fluid flowline operatively connectable to the sample chamber inlet for passing a downhole fluid thereto;
a primary piston slidably disposed within the sample chamber and dividing the sample chamber into a sample volume and a buffer volume, the primary piston having a first face in fluid communication with the sample volume and a second face in fluid communication with the buffer volume;
a secondary piston having a first face in fluid communication with the buffer volume and a second face; and
a buffer fluid disposed in the buffer volume.
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Abstract
A sample module for a sampling while drilling tool includes a sample fluid flowline operatively connectable between a sample chamber and an inlet, for passing a downhole fluid. A primary piston divides the sample chamber into a sample volume and a buffer volume and includes a first face in fluid communication with the sample volume and a second face in fluid communication with the buffer volume. A secondary piston includes a first face in fluid communication with the buffer volume having buffer fluid disposed therein and a second face.
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Citations
25 Claims
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1. A sample module for a sampling while drilling tool positionable in a wellbore penetrating a subterranean formation, comprising:
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a sample chamber having an inlet;
a sample fluid flowline operatively connectable to the sample chamber inlet for passing a downhole fluid thereto;
a primary piston slidably disposed within the sample chamber and dividing the sample chamber into a sample volume and a buffer volume, the primary piston having a first face in fluid communication with the sample volume and a second face in fluid communication with the buffer volume;
a secondary piston having a first face in fluid communication with the buffer volume and a second face; and
a buffer fluid disposed in the buffer volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A sample module for a sampling while drilling tool positionable in a wellbore penetrating a subterranean formation, comprising:
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a sample chamber having an inlet and a sealed end opposite the inlet;
a sample fluid flowline operatively connectable to the sample chamber inlet for passing a downhole fluid thereto;
a primary piston slidably disposed within the sample chamber and dividing the sample chamber into a sample volume and a buffer volume, the primary piston having a first face in fluid communication with the sample volume and a second face in fluid communication with the buffer volume; and
a buffer fluid at substantially atmospheric pressure disposed in the buffer volume, wherein the sample chamber is detachably coupled to the sample module. - View Dependent Claims (17)
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18. A method of obtaining a fluid sample with a sampling while drilling tool, comprising:
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lowering a tool in a wellbore penetrating a subterranean formation, the tool including a sample chamber having a first volume and a second volume;
flowing a sample fluid through an inlet of the tool into the first volume of the sample chamber;
moving a first piston disposed between the first and second volumes, thereby increasing the first volume;
moving a buffer fluid from a first position to a second position with at least one of the first and a second piston; and
moving the second piston disposed between the second and a third volume, thereby decreasing the third volume. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification