US 11,892,592 B2
Pressure transient testing with sensitivity analysis
Kirsty Morton, Cambridge, MA (US); Nikita Chugunov, Arlington, MA (US); Fikri John Kuchuk, Cambridge, MA (US); Richard Booth, Houston, TX (US); Anthony Fitzpatrick, Le Vesinet (FR); and Denis Biryukov, Clamart (FR)
Assigned to Schlumberger Technology Corporation, Sugar Land, AS (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Feb. 8, 2019, as Appl. No. 16/270,847.
Application 16/270,847 is a continuation of application No. 14/762,787, granted, now 10,203,428, issued on Feb. 12, 2019, previously published as PCT/US2014/012861, filed on Jan. 24, 2014.
Claims priority of provisional application 61/756,825, filed on Jan. 25, 2013.
Prior Publication US 2019/0170899 A1, Jun. 6, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. G01V 99/00 (2009.01); E21B 47/06 (2012.01); G01V 1/50 (2006.01); E21B 49/00 (2006.01)
CPC G01V 99/005 (2013.01) [E21B 47/06 (2013.01); E21B 49/008 (2013.01); G01V 1/50 (2013.01); G01V 2210/624 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method comprising:
providing to a computer a model of pressure transient in a discretely fractured reservoir;
performing, via a processor or the computer, a sensitivity analysis to identify an input parameter of the model from multiple input parameters of the model to which a pressure transient output of the model is sensitive, wherein performing the sensitivity analysis comprises:
(i) calculating global sensitivity indices for the multiple input parameters of the model;
(ii) identifying which of the multiple input parameters contribute most to expected uncertainty in pressure and pressure derivative output of the model; and
(iii) determining how contributions of the multiple input parameters to the expected uncertainty vary over a time period comprising a plurality of time ranges;
identifying, from the sensitivity analysis, a test period at which sensitivity of the pressure transient output to the input parameter is high relative to sensitivities of any remaining input parameters of the multiple input parameters of the model such that the input parameter provides a greatest contribution to the expected uncertainty in pressure and pressure derivative output of the model during the test period, wherein the test period corresponds to a time range of the plurality of time ranges;
designing, based on results of the sensitivity analysis, a pressure transient well test for measuring the identified input parameter using the identified test period;
performing the pressure transient well test using the identified test period;
modifying an operation of the pressure transient well test based on actual conditions experienced during the pressure transient well test; and
updating the model based on the pressure transient well performed utilizing the identified test period.