Patent ID: 9303508
Filing Date: 2016-04-05
CPC Classification: E21B

Claim Text:
1. A method comprising: lowering a downhole tool into a wellbore penetrating a subterranean shale formation; logging via the downhole tool, a longitudinal portion of the wellbore adjacent the shale formation to generate logging results; processing the logging results to select test intervals along the longitudinal portion of the wellbore having a relatively low stress level, a relatively low breakdown pressure, or a relatively high horizontal stress anisotropy including determining a test interval sequence to increase a life of the downhole tool, wherein determining the test interval sequence to increase the life of the downhole tool comprises ordering the selected test intervals so that a first one of the selected test intervals associated with a first differential pressure having a lower-stress test intervals across the downhole tool is tested prior to a second one of the selected test intervals associated with a second differential pressure having a higher-stress test intervals across the downhole tool greater than the first differential pressure; performing a stress test at one or more of the selected test intervals to generate stress test results for the shale formation, wherein performing the stress test comprises determining a closure stress of the shale formation; and adjusting a model representing at least one property of the shale formation based on the stress test results.