Modified formation testing apparatus and method
First Claim
Patent Images
1. An apparatus for testing an underground formation during drilling operations, comprising:
- a rotatable drill string;
at least one non-rotating sleeve mounted on said drill string, said drill string being rotatable independently of said sleeve;
at least one extendable element mounted on said at least one sleeve, said at least one extendable element being selectively extendable into sealing engagement with the wall of the well bore for isolating a portion of the well bore at the formation, said at least one extendable element being selectively retractable;
a test port, said test port being exposable to said isolated portion of the well bore; and
a test device for testing at least one characteristic of the formation via said test port.
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Abstract
An apparatus and method for obtaining samples of pristine formation or formation fluid, using a work string designed for performing other downhole work such as drilling, workover operations, or re-entry operations. An extendable element extends against the formation wall to obtain the pristine formation or fluid sample. While the test tool is in a standby condition, the extendable element is withdrawn within the work string, protected by other structure from damage during operation of the work string. The test apparatus is mounted on a sliding, non-rotating, sleeve on the work string.
237 Citations
19 Claims
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1. An apparatus for testing an underground formation during drilling operations, comprising:
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a rotatable drill string; at least one non-rotating sleeve mounted on said drill string, said drill string being rotatable independently of said sleeve; at least one extendable element mounted on said at least one sleeve, said at least one extendable element being selectively extendable into sealing engagement with the wall of the well bore for isolating a portion of the well bore at the formation, said at least one extendable element being selectively retractable; a test port, said test port being exposable to said isolated portion of the well bore; and a test device for testing at least one characteristic of the formation via said test port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of testing a reservoir formation comprising:
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lowering a test apparatus into a well bore on a drill string, said test apparatus having at least one non-rotating sleeve, with an extendable element, a test port, and at least one formation test device; positioning said at least one extendable element adjacent a selected subterranean formation; extending said at least one extendable element to establish a sealing engagement with the wall of the well bore to isolate a portion of the well bore adjacent the selected formation; holding said non-rotating sleeve stationary while allowing for rotation of said drill string to continue; and performing a test of said formation via said test port. - View Dependent Claims (14, 15, 16)
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17. A method of testing a reservoir formation comprising:
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lowering a drill string into a well bore, said drill string having at least one non-rotating sleeve, with an extendable element, a port, and at least one fluid transfer device; positioning said at least one extendable element adjacent a selected subterranean formation; extending said at least one extendable element to establish a sealing engagement with the wall of the well bore to isolate a portion of the well bore adjacent the selected formation; holding said non-rotating sleeve stationary while allowing for rotation of said drill string to continue; and applying high pressure fluid to fracture said isolated portion of the well bore.
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18. A method of testing a reservoir formation comprising:
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lowering a drill string into a well bore, said drill string having at least one non-rotating sleeve, with at least one extendable element, a port, at least one fluid transfer device, and a pressure sensing apparatus mounted on said non-rotating sleeve; positioning said at least one extendable element adjacent a selected subterranean formation; extending said at least one extendable element to establish a sealing engagement with the wall of the well bore to isolate a portion of the well bore adjacent the selected formation; applying fluid via said port with said at least one fluid transfer device to raise the pressure in said isolated portion of the well bore to a selected test level; and monitoring the pressure in said isolated portion of the well bore with said pressure sensing apparatus to sense a pressure drop.
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19. A method of testing a reservoir formation comprising:
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lowering a drill string into a well bore, said drill string including at least two elements expandable from said drill string, at least two ports, and at least one fluid transfer device; positioning said at least two expandable elements adjacent to at least two selected subterranean formations; expanding said at least two expandable elements to establish a sealing engagement with the wall of the well bore to isolate at least two selected subterranean formations from each other; and transferring formation fluid from at least a first said selected subterranean formation to at least a second said selected subterranean formation through said at least two ports.
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Specification