Formation testing
First Claim
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1. A method, comprising:
- (a) collecting data pertaining to at least one of a subterranean formation penetrated by a wellbore and a fluid in the subterranean formation;
(b) determining initial threshold values of test operating parameters for a test to be performed utilizing a testing tool positioned in the wellbore proximate the subterranean formation, wherein determining the initial threshold values is based on the collected data and a testing tool configuration to be utilized to perform the test;
(c) predicting wellbore fluid pressures along an open hole portion of the wellbore by performing a thermo-hydraulic simulation of the test utilizing the determined initial threshold values and the testing tool configuration;
(d) analyzing the predicted wellbore fluid pressures and, based thereon, determining that the predicted wellbore fluid pressures along the open hole portion of the wellbore are indicative of a well integrity problem, and then updating the test by adjusting at least one of;
a value of at least one of the test operating parameters; and
the testing tool configuration;
(e) iteratively repeating (c) and (d) until analysis of the predicted wellbore fluid pressures along the open hole portion of the wellbore is not indicative of a well integrity problem; and
then(f) performing the updated test via operation of the testing tool in the wellbore.
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Abstract
Formation testing which may involve circulating mud in a pipe string from a mud pit through a port in the pipe string to a downhole diverter sub, wherein the pipe string is suspended in a wellbore extending into a subterranean formation, operating a downhole pump to pump formation fluid from the formation, wherein the formation fluid comprises gas, and mixing the pumped formation fluid with circulated mud such that a proportion of the pumped formation gas in the circulated mud is maintained below a threshold value.
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Citations
5 Claims
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1. A method, comprising:
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(a) collecting data pertaining to at least one of a subterranean formation penetrated by a wellbore and a fluid in the subterranean formation; (b) determining initial threshold values of test operating parameters for a test to be performed utilizing a testing tool positioned in the wellbore proximate the subterranean formation, wherein determining the initial threshold values is based on the collected data and a testing tool configuration to be utilized to perform the test; (c) predicting wellbore fluid pressures along an open hole portion of the wellbore by performing a thermo-hydraulic simulation of the test utilizing the determined initial threshold values and the testing tool configuration; (d) analyzing the predicted wellbore fluid pressures and, based thereon, determining that the predicted wellbore fluid pressures along the open hole portion of the wellbore are indicative of a well integrity problem, and then updating the test by adjusting at least one of; a value of at least one of the test operating parameters; and the testing tool configuration; (e) iteratively repeating (c) and (d) until analysis of the predicted wellbore fluid pressures along the open hole portion of the wellbore is not indicative of a well integrity problem; and
then(f) performing the updated test via operation of the testing tool in the wellbore. - View Dependent Claims (2, 3, 4, 5)
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Specification