Methods and apparatus to perform pressure testing of geological formations
First Claim
1. A method for pressure testing a geological formation comprising:
- positioning a testing tool in a wellbore formed in the geological formation;
sealing a sample interval around the testing tool;
sealing a first guard interval around the testing tool and adjacent to the sample interval;
reducing a first pressure in the sample interval;
reducing a second pressure in the first guard interval;
maintaining a volume of a first chamber fluidly coupled to the sample interval during a time interval; and
measuring a plurality of pressure data for a fluid captured in the first chamber during the time interval.
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Abstract
Example methods and apparatus to perform pressure testing of geological formations are disclosed. A disclosed example method comprises positioning a testing tool in a wellbore formed in the geological formation, sealing a sample interval around the testing tool, sealing a first guard interval around the testing tool and adjacent to the sample interval, reducing a first pressure in the sample interval, reducing a second pressure in the first guard interval, maintaining a volume of a first chamber fluidly coupled to the sample interval during a time interval, and measuring a plurality of pressure data for a fluid captured in the first chamber during the time interval.
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Citations
21 Claims
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1. A method for pressure testing a geological formation comprising:
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positioning a testing tool in a wellbore formed in the geological formation; sealing a sample interval around the testing tool; sealing a first guard interval around the testing tool and adjacent to the sample interval; reducing a first pressure in the sample interval; reducing a second pressure in the first guard interval; maintaining a volume of a first chamber fluidly coupled to the sample interval during a time interval; and measuring a plurality of pressure data for a fluid captured in the first chamber during the time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A downhole tool for pressure testing a geological formation, the tool comprising:
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first and second packers to form an inner interval around the testing tool; a third packer to seal a first outer interval around the testing tool adjacent to the inner interval; a first pump to reduce a first pressure in the inner interval; a second pump to reduce a second pressure in the first outer interval; and a pressure gauge to measure a plurality of pressure data for a fluid captured in the inner interval while the second pressure is reduced and a volume of the inner interval is maintained. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification