Single pump focused sampling
First Claim
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1. An apparatus, comprising:
- first and second intakes configured to receive formation fluid from a subterranean formation penetrated by a borehole;
a pump configured to;
draw formation fluid into the first and second intakes; and
discharge into the borehole at least a portion of the formation fluid drawn into the second intake;
a sample chamber in selective fluid communication with the first intake; and
a pilot relief valve coupled to the pump and the sample chamber via a second flow line, wherein the pilot relief valve comprises a bypass mechanism actuated by a motor.
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Abstract
An apparatus comprising first and second fluid intakes, a pump, and a sample chamber, may be positioned in a borehole penetrating a subterranean formation. A method of use thereof may comprise drawing fluid from the subterranean formation and into the first and second fluid intakes using the pump, discharging into the borehole at least a portion of the fluid drawn into the second fluid intake, and selectively diverting at least a portion of the fluid drawn into the first fluid intake to the sample chamber.
147 Citations
20 Claims
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1. An apparatus, comprising:
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first and second intakes configured to receive formation fluid from a subterranean formation penetrated by a borehole; a pump configured to; draw formation fluid into the first and second intakes; and discharge into the borehole at least a portion of the formation fluid drawn into the second intake; a sample chamber in selective fluid communication with the first intake; and a pilot relief valve coupled to the pump and the sample chamber via a second flow line, wherein the pilot relief valve comprises a bypass mechanism actuated by a motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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first and second intakes configured to receive formation fluid from a subterranean formation penetrated by a borehole; a pump configured to; draw formation fluid into the first and second intakes; and discharge into the borehole at least a portion of the formation fluid drawn into the second intake; a sample chamber in selective fluid communication with the first intake; and a pilot relief valve coupled to the pump and the sample chamber via a second flow line, wherein the pilot relief valve comprises a mechanically piloted relief valve configured to be mechanically actuated between an open position and a closed position. - View Dependent Claims (17, 18, 19, 20)
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Specification