Formation sampling
First Claim
1. A downhole tool, comprising:
- a primary flowline extending within the downhole tool to direct fluid from a subterranean formation through the downhole tool;
a secondary flowline in fluid communication with the primary flowline to divert the fluid from the primary flowline to a sample chamber disposed in a sample chamber module of the downhole tool;
a dump flowline disposed in a pump module of the downhole tool and in fluid communication with the primary flowline to divert the fluid from the primary flowline to the wellbore upstream of the secondary flowline; and
a relief valve disposed in the pump module and in the dump flowline to control a pressure of the sample chamber.
2 Assignments
0 Petitions
Accused Products
Abstract
A sampling apparatus, comprising a primary flowline, a secondary flowline, a dump flowline not provided downstream of the secondary flowline, and a relief valve provided in the dump flowline, may be disposed in a wellbore penetrating a subterranean formation. A method of use of the sampling apparatus may comprise flowing fluid from the subterranean formation and into the primary flowline; diverting fluid from the primary flowline to a sample chamber through the secondary flowline; diverting fluid from the primary flowline to the wellbore through the dump flowline; and controlling the pressure in the sample chamber using the relief valve. The sampling apparatus may be used to terminate storage of a fluid sample in a sample chamber while continuing to pump fluid from the formation.
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Citations
16 Claims
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1. A downhole tool, comprising:
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a primary flowline extending within the downhole tool to direct fluid from a subterranean formation through the downhole tool; a secondary flowline in fluid communication with the primary flowline to divert the fluid from the primary flowline to a sample chamber disposed in a sample chamber module of the downhole tool; a dump flowline disposed in a pump module of the downhole tool and in fluid communication with the primary flowline to divert the fluid from the primary flowline to the wellbore upstream of the secondary flowline; and a relief valve disposed in the pump module and in the dump flowline to control a pressure of the sample chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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disposing a downhole tool in a wellbore penetrating a subterranean formation, the downhole tool comprising a primary flowline, a secondary flowline, a dump flowline disposed in a pump module of the downhole tool, and a relief valve disposed in the pump module and in the dump flowline; flowing fluid from the subterranean formation and into the primary flowline; diverting fluid from the primary flowline through the secondary flowline to a sample chamber disposed in a sample chamber module of the downhole tool; diverting fluid from the primary flowline, upstream of the secondary flowline, through the dump flowline to the wellbore; and controlling a pressure in the sample chamber using the relief valve. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification