Formation testing and sampling apparatus and methods
First Claim
1. A formation tester for testing or sampling formation fluids in a borehole, comprising:
- an elongated sealing pad having at least two inlets establishing fluid communication between the formation and the interior of the tester, the elongated sealing pad having an outer surface to hydraulically seal an elongated region along a surface of the borehole and also having at least two elongated recesses extending longitudinally along the outer surface of the pad, each of the at least two elongated recesses establishing a fluid flow channel along the surface of the borehole sealed off by the sealing pad, wherein adjacent recesses in the sealing pad are hydraulically isolated from each other;
a mechanism controlling collection of fluids through at least one inlet into the tester, wherein fluids are being collected from the elongated region along the surface of the borehole sealed off by the sealing pad.
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Abstract
Systems and methods for downhole formation testing based on the use of one or more elongated sealing pads capable off sealing off and collecting or injecting fluids from elongated portions along the surface of a borehole. The modified sealing pads increase the flow area by collecting fluids from an extended portion along the surface of a borehole, which is likely to straddle one or more layers in laminated or fractured formations. A tester device using the elongated sealing pads can be deployed and withdrawn using an extendible element pressing the pads to the borehole. Various designs and arrangements for use with a fluid tester, which may be part of a modular fluid tool, are disclosed in accordance with different embodiments.
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Citations
17 Claims
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1. A formation tester for testing or sampling formation fluids in a borehole, comprising:
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an elongated sealing pad having at least two inlets establishing fluid communication between the formation and the interior of the tester, the elongated sealing pad having an outer surface to hydraulically seal an elongated region along a surface of the borehole and also having at least two elongated recesses extending longitudinally along the outer surface of the pad, each of the at least two elongated recesses establishing a fluid flow channel along the surface of the borehole sealed off by the sealing pad, wherein adjacent recesses in the sealing pad are hydraulically isolated from each other; a mechanism controlling collection of fluids through at least one inlet into the tester, wherein fluids are being collected from the elongated region along the surface of the borehole sealed off by the sealing pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification