APPARATUS AND METHOD FOR FORMATION EVALUATION
First Claim
1. A formation evaluation system for a downhole tool positionable in a wellbore penetrating a subterranean formation, the formation having a virgin fluid and a contaminated fluid therein, comprising:
- at least two inlets for receiving the fluids from the formation;
at least one evaluation flowline fluidly connected to at least one of the at least two inlets for passage of the virgin fluid into the downhole tool;
at least one cleanup flowline fluidly connected to at least one of the at least two inlets for passage of the contaminated fluid into the downhole tool;
at least one fluid circuit fluidly connected to one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof for selectively drawing fluid therein;
at least one fluid connector for selectively establishing a fluid connection between the at least one evaluation flowline and the at least one cleanup flowline; and
at least one sensor for measuring downhole parameters in one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques for reduced contamination formation evaluation are provided. The techniques relate to drawing fluid into a downhole tool positionable in a wellbore penetrating a subterranean formation having a virgin fluid and a contaminated fluid therein. Fluid is drawn into at least two inlets for receiving the fluids from the formation. At least one evaluation flowline is fluidly connected to at least one of the inlets for passage of the virgin fluid into the downhole tool. At least one cleanup flowline is fluidly connected to the inlets for passage of the contaminated fluid into the downhole tool. At least one fluid circuit is fluidly connected to the evaluation flowline and/or cleanup flowlines for selectively drawing fluid therein. At least one fluid connector is provided for selectively establishing a fluid connection between the flowlines. At least one sensor is provided for measuring downhole parameters in one of the flowlines. Fluid may be selectively pumped through the flowlines to reduce the contamination in the evaluation flowline.
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Citations
64 Claims
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1. A formation evaluation system for a downhole tool positionable in a wellbore penetrating a subterranean formation, the formation having a virgin fluid and a contaminated fluid therein, comprising:
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at least two inlets for receiving the fluids from the formation;
at least one evaluation flowline fluidly connected to at least one of the at least two inlets for passage of the virgin fluid into the downhole tool;
at least one cleanup flowline fluidly connected to at least one of the at least two inlets for passage of the contaminated fluid into the downhole tool;
at least one fluid circuit fluidly connected to one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof for selectively drawing fluid therein;
at least one fluid connector for selectively establishing a fluid connection between the at least one evaluation flowline and the at least one cleanup flowline; and
at least one sensor for measuring downhole parameters in one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A formation evaluation tool positionable in a wellbore penetrating a subterranean formation, the formation having a virgin fluid and a contaminated fluid therein, comprising:
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a fluid communication device extendable from the housing for sealing engagement with a wall of the wellbore, the fluid communication device having at least two inlets for receiving the fluids from the formation;
at least one evaluation flowline positioned in the housing and fluidly connected to at least one of the at least two inlets for passage of the virgin fluid into the downhole tool;
at least one cleanup flowline fluidly connected to at least one of the at least two inlets for passage of the contaminated fluid into the downhole tool;
at least one fluid circuit fluidly connected to one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof for selectively drawing fluid therein;
at least one fluid connector for selectively establishing a fluid connection between the at least one evaluation flowline and the at least one cleanup flowline; and
at least one sensor for measuring downhole parameters in one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of evaluating a subterranean formation, the formation having a virgin fluid and a contaminated fluid therein, comprising:
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positioning a downhole tool in a wellbore penetrating the formation, the downhole tool having at least two inlets, the at least two inlets adapted to draw the fluids into at least one evaluation flowline and at least one cleanup flowline in the downhole tool;
selectively drawing the fluids into one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof;
selectively establishing a fluid connection between the at least one evaluation flowline and the at least one cleanup flowline; and
measuring downhole parameters of the fluids in one of the at least one evaluation flowline, the at least one cleanup flowline and combinations thereof. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A method of drawing fluid into a downhole tool, the downhole tool positionable in a wellbore penetrating a formation having a virgin fluid and a contaminated fluid therein, comprising:
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positioning a fluid communication device of the downhole tool in sealing engagement with a wall of the wellbore;
establishing fluid communication between at least one evaluation flowline of the fluid communication device and the formation;
establishing fluid communication between at least one cleanup flowline of the fluid communication device and the formation;
pumping fluid into the at least one cleanup flowline at a cleanup pump rate;
pumping fluid into the at least one evaluation flowline at an evaluation pump rate;
selectively altering one of the cleanup pump rate, the evaluation pump rate and combinations thereof for a discrete time interval; and
performing formation evaluation of the fluid in one of the evaluation flowline, the cleanup flowline and combinations thereof after the time interval. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64)
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Specification