Fluid sample cleanup
First Claim
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1. An apparatus, comprising:
- a downhole tool having a body including a plurality of packers and a plurality of ports between the ones of the plurality packers, the plurality of packers and the plurality of ports spaced along a longitudinal axis of the body;
a controller to obtain a density of a formation fluid and, based on the density, determine a direction to pump the formation fluid relative to a borehole interval defined by ones of the plurality of packers;
a first pump located uphole relative to the plurality of packers;
a second pump located downhole relative to the plurality of packers; and
a flowline simultaneously fluidly coupled to at least two of the plurality of ports that are each positioned in the borehole interval, wherein;
the first and second pumps are selectively fluidly coupled to the flowline;
the controller is operable to operate the first pump to pump the formation fluid through the flowline in an uphole direction when the obtained density of the formation fluid is greater than a density of a wellbore fluid in the borehole interval; and
the controller is operable to operate the second pump to pump the formation fluid through the flowline in a downhole direction when the obtained density of the formation fluid is less than the density of the wellbore fluid in the borehole interval.
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Abstract
An apparatus having a body including a plurality of packers and a plurality of ports between the packers. The packers and ports are spaced along a longitudinal axis of the body. The apparatus also includes a control module to obtain a density of a formation fluid and, based on the density, determine a direction to pump fluid from an interval defined by the packers.
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Citations
19 Claims
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1. An apparatus, comprising:
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a downhole tool having a body including a plurality of packers and a plurality of ports between the ones of the plurality packers, the plurality of packers and the plurality of ports spaced along a longitudinal axis of the body; a controller to obtain a density of a formation fluid and, based on the density, determine a direction to pump the formation fluid relative to a borehole interval defined by ones of the plurality of packers; a first pump located uphole relative to the plurality of packers; a second pump located downhole relative to the plurality of packers; and a flowline simultaneously fluidly coupled to at least two of the plurality of ports that are each positioned in the borehole interval, wherein; the first and second pumps are selectively fluidly coupled to the flowline; the controller is operable to operate the first pump to pump the formation fluid through the flowline in an uphole direction when the obtained density of the formation fluid is greater than a density of a wellbore fluid in the borehole interval; and the controller is operable to operate the second pump to pump the formation fluid through the flowline in a downhole direction when the obtained density of the formation fluid is less than the density of the wellbore fluid in the borehole interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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positioning a downhole tool in a borehole adjacent a formation, wherein the downhole tool comprises; a plurality of packers spaced along a body of the tool; and a plurality of ports positioned between ones of the plurality of packers; then sealing a first interval of the borehole using two of the plurality of packers; then determining, based on a density of a formation fluid, a direction to pump fluid from the first interval through a flowline fluidly coupling two of the plurality of ports that are in fluid communication with the first interval; then pumping fluid from the first interval through the flowline in the determined direction; then determining a condition of the fluid in the first interval; then, based on the condition of the fluid, sealing a second interval of the borehole within the first interval using another two of the plurality of packers located within the first interval; and then pumping fluid from the second interval to collect a fluid sample from the formation. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus, comprising:
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a downhole tool having a body including a plurality of packers and a plurality of ports between ones of the plurality of packers, the plurality of packers and the plurality of ports spaced along a longitudinal axis of the body; a first pump disposed in the downhole tool; a second pump disposed in the downhole tool; and a control module operable to; establish a first sealed borehole interval via operation of at least two of the plurality of packers, wherein at least three of the plurality of ports are positioned within the first sealed borehole interval; then distinguish first and second different fluids in the sealed borehole interval by obtaining first and second densities respective of the first and second fluids; then cause the first pump to pump the first fluid from the first sealed borehole interval in an uphole direction; and then cause the second pump to pump the second fluid from the first sealed borehole interval in a downhole direction while the first pump pumps the first fluid; then establish a second sealed borehole interval within the first sealed borehole interval via operation of at least two other packers of the plurality of packers, wherein at least one of the plurality of ports is positioned between the at least two other packers; then collecting a sample of a formation fluid from the second sealed borehole interval. - View Dependent Claims (16, 17, 18, 19)
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Specification